SIST EN 300 175-8 V2.7.1:2018
(Main)Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part 8: Speech and audio coding and transmission
Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part 8: Speech and audio coding and transmission
The present document is one of the parts of the specification of the Digital Enhanced Cordless Telecommunications
(DECT) Common Interface (CI).
This part of the DECT CI specifies the speech and audio coding and transmission requirements.
In order to ensure satisfactory interworking of different portable and fixed units, it is necessary to specify the
transmission performance of the analog information over the digital link. This requires not only use of a common
speech algorithm, but also standardization of frequency responses, reference speech levels (or loudness) at the air
interface and various other parameters.
The present document applies to DECT equipment which includes all the necessary functions to provide real-time
two-way speech conversation. Several speech services are defined in the present document, including conventional
3,1 kHz telephony, wideband 7 kHz voice transmission and super-wideband 14 kHz service. DECT Fixed part
providing such services may be connected to the public circuit switched (PSTN/ISDN) network, to private networks or
to the Internet.
Tethered fixed point local loop applications are not required to comply with the requirements of the present document.
For the DECT systems which connect to the Public Switched Telephone Network (PSTN) via an analog interface, the
additional requirements, which are implemented in the FP, have as much as possible been aligned with ETSI
TBR 038 [29].
A summary of the control and the use of the DECT echo control functions, to guide on need for options to
manufacturers and installers, is found in annex A.
Information concerning test methods can be found in ETSI EN 300 176-1 [9] and ETSI EN 300 176-2 [10] (previously
covered by ETSI TBR 010 [i.5]). The test methods take into account that DECT is a digital system.
The present document includes New Generation DECT, a further development of the DECT standard introducing
wideband speech, improved data services, new slot types and other technical enhancements.
Digitalne izboljšane brezvrvične telekomunikacije (DECT) - Skupni vmesnik (CI) - 8. del: Kodiranje in prenos govora in zvoka
Ta dokument je eden od delov specifikacije skupnega vmesnika (CI) za digitalne izboljšane brezvrvične telekomunikacije (DECT).
Ta del specifikacije skupnega vmesnika za digitalne izboljšane brezvrvične telekomunikacije določa zahteve za kodiranje in prenos govora ter zvoka.
Za ustrezno medsebojno delovanje različnih prenosnih in fiksnih enot je treba določiti zmogljivost prenosa analognih informacij prek digitalne povezave. Pri tem se poleg uporabe skupnega
govornega algoritma zahtevajo tudi standardizacija frekvenčnih odzivov, ravni referenčnega govora (ali glasnost) pri radijskem vmesniku in drugi različni parametri.
Ta dokument se uporablja za opremo digitalnih izboljšanih brezvrvičnih telekomunikacij, ki vključuje vse potrebne funkcije za zagotavljanje dvosmernih govorjenih pogovorov v realnem času. V tem dokumentu je določenih več govornih storitev, vključno s standardno telefonsko storitvijo na frekvenci 3,1 kHz, širokopasovnim prenosom glasu na frekvenci 7 kHz in super širokopasovno storitvijo na frekvenci 14 kHz. Fiksni del digitalnih izboljšanih brezvrvičnih telekomunikacij, ki zagotavlja takšne storitve, je lahko povezan z omrežjem PSTN/ISDN, zasebnimi omrežji ali internetom.
Ni treba, da za uporabo lokalnih zank fiksnih točk v skupni rabi veljajo zahteve iz tega dokumenta.
Za sisteme digitalnih izboljšanih brezvrvičnih telekomunikacij, ki so v omrežje PSTN povezani prek analognega vmesnika, so bile dodatne zahteve, uvedene v FP, v največji možni meri usklajene s standardom ETSI TBR 038 [29].
Povzetek nadzora in uporabe funkcij nadzora odmeva digitalnih izboljšanih brezvrvičnih telekomunikacij ter smernice z opisom možnosti za proizvajalce in montažerje so na voljo v Dodatku A.
Informacije o preizkusnih metodah so na voljo v standardih ETSI EN 300 176-1 [9] in ETSI EN 300 176-2 [10] (prej so bile zajete v standardu ETSI TBR 010 [i.5]). Pri preizkusnih metodah se upošteva, da je DECT digitalni sistem.
Ta dokument vključuje novo generacijo digitalnih izboljšanih brezvrvičnih telekomunikacij, nadaljnji razvoj standarda za digitalne izboljšane brezvrvične telekomunikacije, ki uvaja širokopasovni govor, izpopolnjene podatkovne storitve, nove tipe rež in druge tehnične izpopolnitve.
General Information
Overview
SIST EN 300 175-8 V2.7.1:2018 (ETSI EN 300 175-8) defines the speech and audio coding and transmission requirements for the DECT Common Interface (CI). The standard ensures interoperable, real‑time two‑way voice between DECT Portable Parts (PP) and Fixed Parts (FP), covering conventional narrowband telephony (3.1 kHz), wideband voice (7 kHz) and super‑wideband service (14 kHz). It also incorporates New Generation DECT features (wideband speech, improved data services and new slot types) and aligns analog FP requirements with existing ETSI documents where relevant.
Key technical topics and requirements
- Speech codecs and bitrates: specifies supported codecs such as G.726 (32 kbit/s ADPCM), G.711 (64 kbit/s PCM), G.722 (64 kbit/s wideband), G.729.1 (up to 32 kbit/s), and MPEG‑4 ER AAC‑LD for super‑wideband audio.
- Transmission performance: standardizes frequency responses, reference speech/loudness levels at the air interface, relative levels and acoustic reference levels to ensure consistent audio quality and interoperability.
- Audio types and handset classes: defines audio type profiles and performance levels for Portable Parts and Fixed Parts (e.g., narrowband/wideband handsets, handsfree loudspeaking types, HATS/P.311 test categories).
- Echo control and PLC: guidance on DECT echo control functions (Annex A) and optional packet loss concealment algorithms for selected codecs.
- Interfaces and connectivity: addresses digital and analog FP interfaces, including requirements for FP connected to PSTN/ISDN, private networks or IP networks; tethered fixed point local loop applications are excluded.
- Volume control and adaptive functions: specifies volume control behavior and FP adaptive volume control to maintain consistent loudness across devices.
- Test and conformance: references test methods in ETSI EN 300 176‑1 and EN 300 176‑2 (previously ETSI TBR 010) for measuring DECT audio performance.
Practical applications and stakeholders
Who uses this standard:
- DECT handset and base station manufacturers (codec implementation, audio tuning)
- VoIP gateway and PBX vendors integrating DECT Fixed Parts with PSTN/ISDN or IP networks
- Test laboratories and certification bodies (conformance testing of audio types)
- System integrators and installers configuring DECT coverage and loudspeaker/volume settings
- Telecom regulators and procurement teams specifying interoperability and quality requirements
Typical applications:
- Cordless telephony for residential and business use
- Wideband and super‑wideband voice services for improved speech quality
- Handsfree/loudspeaking telephony and conference devices over DECT
- DECT‑to‑PSTN/ISDN/VoIP gateways ensuring consistent speech transmission
Related standards
- ETSI EN 300 176‑1 and EN 300 176‑2 (DECT audio test methods)
- ETSI TBR 038 (analog FP/PSTN alignment guidance)
- Codec standards: ITU‑T G.711, G.722, G.726, G.729.1; MPEG‑4 AAC‑LD
Keywords: DECT, speech coding, audio coding, wideband, super‑wideband, G.722, G.711, G.726, G.729.1, AAC‑LD, echo control, PSTN, interoperability.
Standards Content (Sample)
Draft ETSI EN 300 175-8 V2.6.6 (2017-06)
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 8: Speech and audio coding and transmission
2 Draft ETSI EN 300 175-8 V2.6.6 (2017-06)
Reference
REN/DECT-00307-8
Keywords
7 kHz, audio, broadband, codec, DECT,
handsfree, IMT-2000, loudspeaking, mobility,
narrowband, quality, radio, speech, TDD, TDMA,
telephony, terminal
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
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If you find errors in the present document, please send your comment to one of the following services:
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Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2017.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M logo is protected for the benefit of its Members
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI
3 Draft ETSI EN 300 175-8 V2.6.6 (2017-06)
Contents
Intellectual Property Rights . 12
Foreword . 12
Modal verbs terminology . 12
1 Scope . 13
2 References . 13
2.1 Normative references . 13
2.2 Informative references . 15
3 Definitions, symbols and abbreviations . 16
3.1 Definitions . 16
3.2 Symbols and abbreviations . 17
4 Configurations . 19
4.1 Reference configuration . 19
4.1.1 Basic configuration . 19
4.1.2 Portable Part (PP) . 21
4.1.2.1 Functional organization . 21
4.1.2.2 Volume control . 21
4.1.3 Fixed Part (FP) . 21
4.1.3.1 Digital interface . 21
4.1.3.2 Analog interface . 23
4.1.3.3 FP adaptive volume control . 23
4.2 Test configurations . 23
5 Encoding . 23
5.0 General . 23
5.1 32 kbit/s full term (ADPCM) G.726 . 24
5.1.1 Algorithm . 24
5.1.2 Bit sequence . 24
5.1.3 Characteristics of G.726 ADPCM codec . 24
5.2 64 kbit/s PCM G.711 . 24
5.2.1 Algorithm . 24
5.2.2 Bit sequence . 24
5.2.3 Characteristics of G.711 PCM codec . 25
5.2.4 Automatic detection of FAX/modem tone and switch to G.711 . 25
5.3 Wideband speech codec G.722 at 64 kbit/s . 25
5.3.0 General . 25
5.3.1 Algorithm . 25
5.3.2 Bit sequence . 25
5.3.3 Characteristics of G.722 wideband codec . 25
5.3.4 Optional Packet Loss Concealment algorithm (PLC) . 26
5.4 Wideband speech codec G.729.1 up to 32 kbit/s . 26
5.4.1 Algorithm . 26
5.4.2 Bit sequence . 26
5.4.3 Characteristics of G.729.1 codec . 26
5.4.4 Packet Loss Concealment algorithm (PLC) . 27
5.4.5 Supported bit rate in DECT . 27
5.5 Super-wideband MPEG-4 speech and audio coding . 27
5.5.1 Algorithm . 27
5.5.2 64 kbit/s, MPEG-4 ER AAC-LD codec . 28
5.5.3 32 kbit/s, MPEG-4 ER AAC-LD codec . 28
5.6 Other codings . 28
6 Transmission aspects . 29
6.1 Relative level . 29
6.2 Acoustic reference level . 29
6.3 Volume control . 29
ETSI
4 Draft ETSI EN 300 175-8 V2.6.6 (2017-06)
7 Audio specifications . 29
7.1 Overall description . 29
7.1.1 Introduction to DECT audio specifications . 29
7.1.2 Introduction to the audio types . 29
7.1.3 List of Audio types . 30
7.1.4 Audio types for Portable Parts . 31
7.1.5 Audio types for Fixed Parts . 32
7.1.6 Complete DECT system . 32
7.1.7 Structure of the specification of the audio types . 32
7.1.8 Audio Types and codecs . 38
7.1.9 Audio Types and physical interfaces . 38
7.2 Audio types applicable to Portable Parts . 38
7.2.0 General . 38
7.2.1 Performance levels of DECT Portable Parts (handsets). 38
7.2.2 Type 0: Reference PP (RePP) . 39
7.2.3 PP Type 1a: "Classic" GAP narrowband handset . 40
7.2.3.1 Introduction . 40
7.2.3.2 Compatible services and codecs . 40
7.2.3.3 Specification. 40
7.2.4 PP Type 1b: "Improved" GAP narrowband handset . 40
7.2.4.1 Introduction . 40
7.2.4.2 Compatible services and codecs . 40
7.2.4.3 Specification. 40
7.2.5 PP Type 1c: HATS-tested "standard" narrowband handset . 41
7.2.5.1 Introduction . 41
7.2.5.2 Compatible services and codecs . 41
7.2.5.3 Specification. 41
7.2.6 PP Type 1d: HATS-tested "improved" narrowband handset . 41
7.2.6.1 Introduction . 41
7.2.6.2 Compatible services and codecs . 41
7.2.6.3 Specification. 41
7.2.7 PP Type 3a: HATS tested narrowband "standard" loudspeaking handsfree . 42
7.2.7.1 Introduction . 42
7.2.7.2 Compatible services and codecs . 42
7.2.7.3 Specification. 42
7.2.8 PP Type 3b: HATS tested narrowband "improved" loudspeaking handsfree . 42
7.2.8.1 Introduction . 42
7.2.8.2 Compatible services and codecs . 42
7.2.8.3 Specification. 42
7.2.9 PP Type 2a: P.311-tested wideband handset. 43
7.2.9.1 Introduction . 43
7.2.9.2 Compatible services and codecs . 43
7.2.9.3 Specification. 43
7.2.10 PP Type 2b: HATS-tested "standard" wideband handset or headset . 43
7.2.10.1 Introduction . 43
7.2.10.2 Compatible services and codecs . 43
7.2.10.3 Specification. 43
7.2.11 PP Type 2c: HATS tested "improved" wideband handset or headset . 44
7.2.11.1 Introduction . 44
7.2.11.2 Compatible services and codecs . 44
7.2.11.3 Specification. 44
7.2.12 PP Type 4a: HATS tested wideband "standard" loudspeaking handsfree . 44
7.2.12.1 Introduction . 44
7.2.12.2 Compatible services and codecs . 44
7.2.12.3 Specification. 44
7.2.13 PP Type 4b: HATS tested wideband "improved" loudspeaking and handsfree . 45
7.2.13.1 Introduction . 45
7.2.13.2 Compatible services and codecs . 45
7.2.13.3 Specification. 45
7.2.14 PP Type 5a: super-wideband 14 kHz handset . 45
7.2.14.1 Introduction . 45
7.2.14.2 Compatible services and codecs . 45
ETSI
5 Draft ETSI EN 300 175-8 V2.6.6 (2017-06)
7.2.14.3 Specification. 45
7.2.15 PP Type 5b: super-wideband 14 kHz loudspeaking handsfree . 45
7.2.15.1 Introduction . 45
7.2.15.2 Compatible services and codecs . 45
7.2.15.3 Specification. 45
7.2.16 PP Type 6: PPs with external 2 wire, 3,1 kHz telephony interface . 46
7.2.16.1 Introduction . 46
7.2.16.2 Compatible services and codecs . 46
7.2.16.3 Specification. 46
7.3 Audio transmission types applicable to Fixed Parts . 46
7.3.0 General . 46
7.3.1 FP Type 0: Reference FP (ReFP) . 46
7.3.2 FP Type 1a: "classical" Fixed Part for ISDN Network . 47
7.3.2.1 Introduction . 47
7.3.2.2 Compatible services and codecs . 47
7.3.2.3 Specifications . 47
7.3.2.3.1 Transcoding and equalization . 47
7.3.2.3.2 PP type detection . 48
7.3.2.3.3 Activation of audio processing functions . 48
7.3.2.3.4 Transmission specification . 48
7.3.3 FP Type 1b: "new" Fixed Part for ISDN Network . 48
7.3.3.1 Introduction . 48
7.3.3.2 Compatible services and codecs . 49
7.3.3.3 Specification. 49
7.3.3.3.1 Transcoding and equalization . 49
7.3.3.3.2 PP type detection . 49
7.3.3.3.3 Activation of audio processing functions . 49
7.3.3.3.4 Transmission specification . 50
7.3.4 FP Type 2: FP with analog 2-wire interface, 3,1 kHz service . 50
7.3.4.1 Introduction . 50
7.3.4.2 Compatible services, physical interfaces and codecs . 50
7.3.4.3 Specification. 50
7.3.4.3.1 Transcoding, equalization and conversion . 50
7.3.4.3.2 PP type detection and activation of audio processing functions . 51
7.3.4.3.3 Transmission specification . 51
7.3.5 FP Type 3: VoIP narrowband Fixed Part . 51
7.3.5.1 Introduction . 51
7.3.5.2 Compatible services, physical interfaces and codecs . 51
7.3.5.3 Specification. 52
7.3.5.3.1 Transcoding and equalization . 52
7.3.5.3.2 PP type detection . 52
7.3.5.3.3 Activation of audio processing functions . 52
7.3.5.3.4 Transmission specification . 53
7.3.6 FP Type 4: ISDN wideband Fixed Part . 53
7.3.6.1 Introduction . 53
7.3.6.2 Compatible services and codecs . 53
7.3.6.3 Specification. 54
7.3.6.3.1 Transcoding and equalization . 54
7.3.6.3.2 PP type detection . 54
7.3.6.3.3 Activation of audio processing functions . 54
7.3.6.3.4 Transmission specification . 54
7.3.7 FP Type 5: VoIP wideband Fixed Part . 55
7.3.7.1 Introduction . 55
7.3.7.2 Compatible services, physical interfaces and codecs . 55
7.3.7.3 Specification. 55
7.3.7.3.1 Transcoding and equalization . 55
7.3.7.3.2 PP type detection . 55
7.3.7.3.3 Activation of audio processing functions . 56
7.3.7.3.4 Transmission specification . 56
7.3.8 FP Type 6a: FP handling an Internal call inside a DECT FP (any service) . 56
7.3.8.1 Introduction . 56
7.3.8.2 Compatible services, physical interfaces and codecs . 56
ETSI
6 Draft ETSI EN 300 175-8 V2.6.6 (2017-06)
7.3.8.3 Specification. 57
7.3.9 FP Type 6b: FP handling an n-party conference inside a DECT FP (any service) . 57
7.3.9.1 Introduction . 57
7.3.9.2 Compatible services, physical interfaces and codecs . 57
7.3.9.3 Specification for the conference bridge. 57
7.3.10 FP Type 7: DECT Repeater part (REP) . 57
7.3.10.1 Introduction . 57
7.3.10.2 Compatible services, physical interfaces and codecs . 57
7.3.10.3 Specification. 57
7.4 Additional features . 58
7.4.1 Introduction. 58
7.4.2 Echo canceller in Fixed Part . 58
7.4.3 Echo suppressor in Fixed Part. 59
7.5 Transmission characteristics for Portable Parts . 59
7.5.1 Transmission characteristics for Portable Part type 1a ("Classic GAP" handset) . 59
7.5.1.1 PP frequency responses . 59
7.5.1.1.1 Sending . 59
7.5.1.1.2 Receiving . 60
7.5.1.2 PP sending and receiving loudness ratings . 60
7.5.1.2.1 Nominal values . 60
7.5.1.2.2 User-controlled volume control in PP . 60
7.5.1.2.3 PP adaptive volume control . 61
7.5.1.3 Sidetone . 61
7.5.1.3.1 Talker sidetone . 61
7.5.1.3.2 Listener sidetone . 61
7.5.1.4 Terminal coupling loss . 62
7.5.1.4.1 Weighted Terminal Coupling Loss (TCLw) . 62
7.5.1.4.2 Stability loss . 62
7.5.1.5 Distortion . 62
7.5.1.5.1 Sending . 62
7.5.1.5.2 Receiving . 63
7.5.1.5.3 Sidetone . 63
7.5.1.6 Out of band signals. 63
7.5.1.6.1 Sending (discrimination against out of band input signals) . 63
7.5.1.6.2 Receiving (spurious out of band signals) . 63
7.5.1.7 Noise . 63
7.5.1.7.1 Sending . 63
7.5.1.7.2 Band-limited noise. 63
7.5.1.7.3 Receiving . 63
7.5.1.7.4 Level of sampling frequency (receiving) . 64
7.5.1.8 Acoustic shock . 64
7.5.1.8.0 General . 64
7.5.1.8.1 Continuous signal . 64
7.5.1.8.2 Peak signal . 64
7.5.1.9 PP Delay . 64
7.5.1.10 PP ambient noise rejection . 64
7.5.2 Additional requirements for PP type 1b ("improved GAP" handset) . 64
7.5.2.0 General . 64
7.5.2.1 Terminal coupling loss . 64
7.5.2.1.1 Weighted Terminal Coupling Loss (TCLw) . 64
7.5.2.2 Attenuation Range in Sending Direction during Double Talk A . 65
H,S,dt
7.5.2.3 Attenuation Range in Receiving Direction during Double Talk A . 65
H,R,dt
7.5.2.4 Activation in Sending Direction . 65
7.5.2.5 Activation in Receiving Direction . 66
7.5.3 Transmission characteristics for PP types 1c and 1d (HATS tested, narrowband telephony handsets) . 66
7.5.3.1 PP frequency responses . 66
7.5.3.1.1 Sending . 66
7.5.3.1.2 Receiving . 67
7.5.3.2 PP sending and receiving loudness ratings . 69
7.5.3.2.1 Nominal values . 69
7.5.3.2.2 User-controlled volume control in PP . 70
7.5.3.2.3 PP adaptive volume control . 70
ETSI
7 Draft ETSI EN 300 175-8 V2.6.6 (2017-06)
7.5.3.3 Sidetone . 71
7.5.3.3.1 Talker sidetone . 71
7.5.3.3.2 D Factor . 71
7.5.3.3.3 Sidetone delay . 71
7.5.3.4 Terminal coupling loss . 71
7.5.3.4.1 TCLw of Portable Part . 71
7.5.3.4.2 Stability loss . 72
7.5.3.5 Distortion . 72
7.5.3.5.1 Sending Distortion . 72
7.5.3.5.2 Receiving Distortion . 72
7.5.3.6 Out of band signals. 72
7.5.3.6.1 Out-of-band Signals in Send direction . 72
7.5.3.6.2 Out-of-band signals in receiving direction . 73
7.5.3.7 Noise . 73
7.5.3.7.1 Sending . 73
7.5.3.7.2 Receiving . 73
7.5.3.8 Acoustic shock . 74
7.5.3.8.0 General . 74
7.5.3.8.1 Continuous signal . 74
7.5.3.8.2 Peak signal . 74
7.5.3.9 Delay . 74
7.5.3.10 Variation of gain with input level-sending . 74
7.5.3.11 Double Talk Performance . 75
7.5.3.11.0 General . 75
7.5.3.11.1 Attenuation Range in Sending Direction during Double Talk A . 75
H,S,dt
7.5.3.11.2 Attenuation Range in Receiving Direction during Double Talk A . 75
H,S,dt
7.5.3.11.3 Detection of Echo Components during Double Talk . 76
7.5.3.11.4 Minimum activation level and sensitivity of double talk detection . 76
7.5.3.12 Switching characteristics . 76
7.5.3.12.0 General . 76
7.5.3.12.1 Activation in Sending Direction .
...
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 8: Speech and audio coding and transmission
2 ETSI EN 300 175-8 V2.7.1 (2017-11)
Reference
REN/DECT-00307-8
Keywords
7 kHz, audio, broadband, codec, DECT,
handsfree, IMT-2000, loudspeaking, mobility,
narrowband, quality, radio, speech, TDD, TDMA,
telephony, terminal
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88
Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2017.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M logo is protected for the benefit of its Members.
GSM® and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
3 ETSI EN 300 175-8 V2.7.1 (2017-11)
Contents
Intellectual Property Rights . 12
Foreword . 12
Modal verbs terminology . 12
1 Scope . 13
2 References . 13
2.1 Normative references . 13
2.2 Informative references . 15
3 Definitions, symbols and abbreviations . 16
3.1 Definitions . 16
3.2 Symbols and abbreviations . 17
4 Configurations . 19
4.1 Reference configuration . 19
4.1.1 Basic configuration . 19
4.1.2 Portable Part (PP) . 21
4.1.2.1 Functional organization . 21
4.1.2.2 Volume control . 21
4.1.3 Fixed Part (FP) . 21
4.1.3.1 Digital interface . 21
4.1.3.2 Analog interface . 23
4.1.3.3 FP adaptive volume control . 23
4.2 Test configurations . 23
5 Encoding . 23
5.0 General . 23
5.1 32 kbit/s full term (ADPCM) G.726 . 24
5.1.1 Algorithm . 24
5.1.2 Bit sequence . 24
5.1.3 Characteristics of G.726 ADPCM codec . 24
5.2 64 kbit/s PCM G.711 . 24
5.2.1 Algorithm . 24
5.2.2 Bit sequence . 24
5.2.3 Characteristics of G.711 PCM codec . 25
5.2.4 Automatic detection of FAX/modem tone and switch to G.711 . 25
5.3 Wideband speech codec G.722 at 64 kbit/s . 25
5.3.0 General . 25
5.3.1 Algorithm . 25
5.3.2 Bit sequence . 25
5.3.3 Characteristics of G.722 wideband codec . 25
5.3.4 Optional Packet Loss Concealment algorithm (PLC) . 26
5.4 Wideband speech codec G.729.1 up to 32 kbit/s . 26
5.4.1 Algorithm . 26
5.4.2 Bit sequence . 26
5.4.3 Characteristics of G.729.1 codec . 26
5.4.4 Packet Loss Concealment algorithm (PLC) . 27
5.4.5 Supported bit rate in DECT . 27
5.5 Super-wideband MPEG-4 speech and audio coding . 27
5.5.1 Algorithm . 27
5.5.2 64 kbit/s, MPEG-4 ER AAC-LD codec . 28
5.5.3 32 kbit/s, MPEG-4 ER AAC-LD codec . 28
5.6 Other codings . 28
6 Transmission aspects . 29
6.1 Relative level . 29
6.2 Acoustic reference level . 29
6.3 Volume control . 29
ETSI
4 ETSI EN 300 175-8 V2.7.1 (2017-11)
7 Audio specifications . 29
7.1 Overall description . 29
7.1.1 Introduction to DECT audio specifications . 29
7.1.2 Introduction to the audio types . 29
7.1.3 List of Audio types . 30
7.1.4 Audio types for Portable Parts . 31
7.1.5 Audio types for Fixed Parts . 32
7.1.6 Complete DECT system . 32
7.1.7 Structure of the specification of the audio types . 32
7.1.8 Audio Types and codecs . 38
7.1.9 Audio Types and physical interfaces . 38
7.2 Audio types applicable to Portable Parts . 38
7.2.0 General . 38
7.2.1 Performance levels of DECT Portable Parts (handsets). 38
7.2.2 Type 0: Reference PP (RePP) . 39
7.2.3 PP Type 1a: "Classic" GAP narrowband handset . 40
7.2.3.1 Introduction . 40
7.2.3.2 Compatible services and codecs . 40
7.2.3.3 Specification. 40
7.2.4 PP Type 1b: "Improved" GAP narrowband handset . 40
7.2.4.1 Introduction . 40
7.2.4.2 Compatible services and codecs . 40
7.2.4.3 Specification. 40
7.2.5 PP Type 1c: HATS-tested "standard" narrowband handset . 41
7.2.5.1 Introduction . 41
7.2.5.2 Compatible services and codecs . 41
7.2.5.3 Specification. 41
7.2.6 PP Type 1d: HATS-tested "improved" narrowband handset . 41
7.2.6.1 Introduction . 41
7.2.6.2 Compatible services and codecs . 41
7.2.6.3 Specification. 41
7.2.7 PP Type 3a: HATS tested narrowband "standard" loudspeaking handsfree . 42
7.2.7.1 Introduction . 42
7.2.7.2 Compatible services and codecs . 42
7.2.7.3 Specification. 42
7.2.8 PP Type 3b: HATS tested narrowband "improved" loudspeaking handsfree . 42
7.2.8.1 Introduction . 42
7.2.8.2 Compatible services and codecs . 42
7.2.8.3 Specification. 42
7.2.9 PP Type 2a: P.311-tested wideband handset. 43
7.2.9.1 Introduction . 43
7.2.9.2 Compatible services and codecs . 43
7.2.9.3 Specification. 43
7.2.10 PP Type 2b: HATS-tested "standard" wideband handset or headset . 43
7.2.10.1 Introduction . 43
7.2.10.2 Compatible services and codecs . 43
7.2.10.3 Specification. 43
7.2.11 PP Type 2c: HATS tested "improved" wideband handset or headset . 44
7.2.11.1 Introduction . 44
7.2.11.2 Compatible services and codecs . 44
7.2.11.3 Specification. 44
7.2.12 PP Type 4a: HATS tested wideband "standard" loudspeaking handsfree . 44
7.2.12.1 Introduction . 44
7.2.12.2 Compatible services and codecs . 44
7.2.12.3 Specification. 44
7.2.13 PP Type 4b: HATS tested wideband "improved" loudspeaking and handsfree . 45
7.2.13.1 Introduction . 45
7.2.13.2 Compatible services and codecs . 45
7.2.13.3 Specification. 45
7.2.14 PP Type 5a: super-wideband 14 kHz handset . 45
7.2.14.1 Introduction . 45
7.2.14.2 Compatible services and codecs . 45
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5 ETSI EN 300 175-8 V2.7.1 (2017-11)
7.2.14.3 Specification. 45
7.2.15 PP Type 5b: super-wideband 14 kHz loudspeaking handsfree . 45
7.2.15.1 Introduction . 45
7.2.15.2 Compatible services and codecs . 45
7.2.15.3 Specification. 45
7.2.16 PP Type 6: PPs with external 2 wire, 3,1 kHz telephony interface . 46
7.2.16.1 Introduction . 46
7.2.16.2 Compatible services and codecs . 46
7.2.16.3 Specification. 46
7.3 Audio transmission types applicable to Fixed Parts . 46
7.3.0 General . 46
7.3.1 FP Type 0: Reference FP (ReFP) . 46
7.3.2 FP Type 1a: "classical" Fixed Part for ISDN Network . 47
7.3.2.1 Introduction . 47
7.3.2.2 Compatible services and codecs . 47
7.3.2.3 Specifications . 47
7.3.2.3.1 Transcoding and equalization . 47
7.3.2.3.2 PP type detection . 48
7.3.2.3.3 Activation of audio processing functions . 48
7.3.2.3.4 Transmission specification . 48
7.3.3 FP Type 1b: "new" Fixed Part for ISDN Network . 48
7.3.3.1 Introduction . 48
7.3.3.2 Compatible services and codecs . 49
7.3.3.3 Specification. 49
7.3.3.3.1 Transcoding and equalization . 49
7.3.3.3.2 PP type detection . 49
7.3.3.3.3 Activation of audio processing functions . 49
7.3.3.3.4 Transmission specification . 50
7.3.4 FP Type 2: FP with analog 2-wire interface, 3,1 kHz service . 50
7.3.4.1 Introduction . 50
7.3.4.2 Compatible services, physical interfaces and codecs . 50
7.3.4.3 Specification. 50
7.3.4.3.1 Transcoding, equalization and conversion . 50
7.3.4.3.2 PP type detection and activation of audio processing functions . 51
7.3.4.3.3 Transmission specification . 51
7.3.5 FP Type 3: VoIP narrowband Fixed Part . 51
7.3.5.1 Introduction . 51
7.3.5.2 Compatible services, physical interfaces and codecs . 51
7.3.5.3 Specification. 52
7.3.5.3.1 Transcoding and equalization . 52
7.3.5.3.2 PP type detection . 52
7.3.5.3.3 Activation of audio processing functions . 52
7.3.5.3.4 Transmission specification . 53
7.3.6 FP Type 4: ISDN wideband Fixed Part . 53
7.3.6.1 Introduction . 53
7.3.6.2 Compatible services and codecs . 53
7.3.6.3 Specification. 54
7.3.6.3.1 Transcoding and equalization . 54
7.3.6.3.2 PP type detection . 54
7.3.6.3.3 Activation of audio processing functions . 54
7.3.6.3.4 Transmission specification . 54
7.3.7 FP Type 5: VoIP wideband Fixed Part . 55
7.3.7.1 Introduction . 55
7.3.7.2 Compatible services, physical interfaces and codecs . 55
7.3.7.3 Specification. 55
7.3.7.3.1 Transcoding and equalization . 55
7.3.7.3.2 PP type detection . 55
7.3.7.3.3 Activation of audio processing functions . 56
7.3.7.3.4 Transmission specification . 56
7.3.8 FP Type 6a: FP handling an Internal call inside a DECT FP (any service) . 56
7.3.8.1 Introduction . 56
7.3.8.2 Compatible services, physical interfaces and codecs . 56
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6 ETSI EN 300 175-8 V2.7.1 (2017-11)
7.3.8.3 Specification. 57
7.3.9 FP Type 6b: FP handling an n-party conference inside a DECT FP (any service) . 57
7.3.9.1 Introduction . 57
7.3.9.2 Compatible services, physical interfaces and codecs . 57
7.3.9.3 Specification for the conference bridge. 57
7.3.10 FP Type 7: DECT Repeater part (REP) . 57
7.3.10.1 Introduction . 57
7.3.10.2 Compatible services, physical interfaces and codecs . 57
7.3.10.3 Specification. 57
7.4 Additional features . 58
7.4.1 Introduction. 58
7.4.2 Echo canceller in Fixed Part . 58
7.4.3 Echo suppressor in Fixed Part. 59
7.5 Transmission characteristics for Portable Parts . 59
7.5.1 Transmission characteristics for Portable Part type 1a ("Classic GAP" handset) . 59
7.5.1.1 PP frequency responses . 59
7.5.1.1.1 Sending . 59
7.5.1.1.2 Receiving . 60
7.5.1.2 PP sending and receiving loudness ratings . 60
7.5.1.2.1 Nominal values . 60
7.5.1.2.2 User-controlled volume control in PP . 60
7.5.1.2.3 PP adaptive volume control . 61
7.5.1.3 Sidetone . 61
7.5.1.3.1 Talker sidetone . 61
7.5.1.3.2 Listener sidetone . 61
7.5.1.4 Terminal coupling loss . 62
7.5.1.4.1 Weighted Terminal Coupling Loss (TCLw) . 62
7.5.1.4.2 Stability loss . 62
7.5.1.5 Distortion . 62
7.5.1.5.1 Sending . 62
7.5.1.5.2 Receiving . 63
7.5.1.5.3 Sidetone . 63
7.5.1.6 Out of band signals. 63
7.5.1.6.1 Sending (discrimination against out of band input signals) . 63
7.5.1.6.2 Receiving (spurious out of band signals) . 63
7.5.1.7 Noise . 63
7.5.1.7.1 Sending . 63
7.5.1.7.2 Band-limited noise. 63
7.5.1.7.3 Receiving . 63
7.5.1.7.4 Level of sampling frequency (receiving) . 64
7.5.1.8 Acoustic shock . 64
7.5.1.8.0 General . 64
7.5.1.8.1 Continuous signal . 64
7.5.1.8.2 Peak signal . 64
7.5.1.9 PP Delay . 64
7.5.1.10 PP ambient noise rejection . 64
7.5.2 Additional requirements for PP type 1b ("improved GAP" handset) . 64
7.5.2.0 General . 64
7.5.2.1 Terminal coupling loss . 64
7.5.2.1.1 Weighted Terminal Coupling Loss (TCLw) . 64
7.5.2.2 Attenuation Range in Sending Direction during Double Talk A . 65
H,S,dt
7.5.2.3 Attenuation Range in Receiving Direction during Double Talk A . 65
H,R,dt
7.5.2.4 Activation in Sending Direction . 65
7.5.2.5 Activation in Receiving Direction . 66
7.5.3 Transmission characteristics for PP types 1c and 1d (HATS tested, narrowband telephony handsets) . 66
7.5.3.1 PP frequency responses . 66
7.5.3.1.1 Sending . 66
7.5.3.1.2 Receiving . 67
7.5.3.2 PP sending and receiving loudness ratings . 69
7.5.3.2.1 Nominal values . 69
7.5.3.2.2 User-controlled volume control in PP . 70
7.5.3.2.3 PP adaptive volume control . 70
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7 ETSI EN 300 175-8 V2.7.1 (2017-11)
7.5.3.3 Sidetone . 71
7.5.3.3.1 Talker sidetone . 71
7.5.3.3.2 D Factor . 71
7.5.3.3.3 Sidetone delay . 71
7.5.3.4 Terminal coupling loss . 71
7.5.3.4.1 TCLw of Portable Part . 71
7.5.3.4.2 Stability loss . 72
7.5.3.5 Distortion . 72
7.5.3.5.1 Sending Distortion . 72
7.5.3.5.2 Receiving Distortion . 72
7.5.3.6 Out of band signals. 72
7.5.3.6.1 Out-of-band Signals in Send direction . 72
7.5.3.6.2 Out-of-band signals in receiving direction . 73
7.5.3.7 Noise . 73
7.5.3.7.1 Sending . 73
7.5.3.7.2 Receiving . 73
7.5.3.8 Acoustic shock . 74
7.5.3.8.0 General . 74
7.5.3.8.1 Continuous signal . 74
7.5.3.8.2 Peak signal . 74
7.5.3.9 Delay . 74
7.5.3.10 Variation of gain with input level-sending . 74
7.5.3.11 Double Talk Performance . 75
7.5.3.11.0 General . 75
7.5.3.11.1 Attenuation Range in Sending Direction during Double Talk A . 75
H,S,dt
7.5.3.11.2 Attenuation Range in Receiving Direction during Double Talk A . 75
H,S,dt
7.5.3.11.3 Detection of Echo Components during Double Talk . 76
7.5.3.11.4 Minimum activation level and sensitivity of double talk detection . 76
7.5.3.12 Switching characteristics . 76
7.5.3.12.0 General . 76
7.5.3.12.1 Activation in Sending Direction .
...
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part 8: Speech and audio coding and transmission33.070.30'(&7Digital Enhanced Cordless Telecommunications (DECT)ICS:Ta slovenski standard je istoveten z:ETSI EN 300 175-8 V2.7.1 (2017-11)SIST EN 300 175-8 V2.7.1:2018en01-februar-2018SIST EN 300 175-8 V2.7.1:2018SLOVENSKI
STANDARD
EUROPEAN STANDARD SIST EN 300 175-8 V2.7.1:2018
ETSI ETSI EN 300 175-8 V2.7.1 (2017-11) 2
Reference REN/DECT-00307-8 Keywords 7 kHz, audio, broadband, codec, DECT, handsfree, IMT-2000, loudspeaking, mobility, narrowband, quality, radio, speech, TDD, TDMA, telephony, terminal ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00
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Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88
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DECTTM, PLUGTESTSTM, UMTSTM and the ETSI logo are trademarks of ETSI registered for the benefit of its Members. 3GPPTM and LTE™ are trademarks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. oneM2M logo is protected for the benefit of its Members. GSM® and the GSM logo are trademarks registered and owned by the GSM Association. SIST EN 300 175-8 V2.7.1:2018
ETSI ETSI EN 300 175-8 V2.7.1 (2017-11) 3 Contents Intellectual Property Rights . 12 Foreword . 12 Modal verbs terminology . 12 1 Scope . 13 2 References . 13 2.1 Normative references . 13 2.2 Informative references . 15 3 Definitions, symbols and abbreviations . 16 3.1 Definitions . 16 3.2 Symbols and abbreviations . 17 4 Configurations . 19 4.1 Reference configuration . 19 4.1.1 Basic configuration . 19 4.1.2 Portable Part (PP) . 21 4.1.2.1 Functional organization . 21 4.1.2.2 Volume control . 21 4.1.3 Fixed Part (FP) . 21 4.1.3.1 Digital interface . 21 4.1.3.2 Analog interface . 23 4.1.3.3 FP adaptive volume control . 23 4.2 Test configurations . 23 5 Encoding . 23 5.0 General . 23 5.1 32 kbit/s full term (ADPCM) G.726 . 24 5.1.1 Algorithm . 24 5.1.2 Bit sequence . 24 5.1.3 Characteristics of G.726 ADPCM codec . 24 5.2 64 kbit/s PCM G.711 . 24 5.2.1 Algorithm . 24 5.2.2 Bit sequence . 24 5.2.3 Characteristics of G.711 PCM codec . 25 5.2.4 Automatic detection of FAX/modem tone and switch to G.711 . 25 5.3 Wideband speech codec G.722 at 64 kbit/s . 25 5.3.0 General . 25 5.3.1 Algorithm . 25 5.3.2 Bit sequence . 25 5.3.3 Characteristics of G.722 wideband codec . 25 5.3.4 Optional Packet Loss Concealment algorithm (PLC) . 26 5.4 Wideband speech codec G.729.1 up to 32 kbit/s . 26 5.4.1 Algorithm . 26 5.4.2 Bit sequence . 26 5.4.3 Characteristics of G.729.1 codec . 26 5.4.4 Packet Loss Concealment algorithm (PLC) . 27 5.4.5 Supported bit rate in DECT . 27 5.5 Super-wideband MPEG-4 speech and audio coding . 27 5.5.1 Algorithm . 27 5.5.2 64 kbit/s, MPEG-4 ER AAC-LD codec . 28 5.5.3 32 kbit/s, MPEG-4 ER AAC-LD codec . 28 5.6 Other codings . 28 6 Transmission aspects . 29 6.1 Relative level . 29 6.2 Acoustic reference level . 29 6.3 Volume control . 29 SIST EN 300 175-8 V2.7.1:2018
ETSI ETSI EN 300 175-8 V2.7.1 (2017-11) 4 7 Audio specifications . 29 7.1 Overall description . 29 7.1.1 Introduction to DECT audio specifications . 29 7.1.2 Introduction to the audio types . 29 7.1.3 List of Audio types . 30 7.1.4 Audio types for Portable Parts . 31 7.1.5 Audio types for Fixed Parts . 32 7.1.6 Complete DECT system . 32 7.1.7 Structure of the specification of the audio types . 32 7.1.8 Audio Types and codecs . 38 7.1.9 Audio Types and physical interfaces . 38 7.2 Audio types applicable to Portable Parts . 38 7.2.0 General . 38 7.2.1 Performance levels of DECT Portable Parts (handsets). 38 7.2.2 Type 0: Reference PP (RePP) . 39 7.2.3 PP Type 1a: "Classic" GAP narrowband handset . 40 7.2.3.1 Introduction . 40 7.2.3.2 Compatible services and codecs . 40 7.2.3.3 Specification. 40 7.2.4 PP Type 1b: "Improved" GAP narrowband handset . 40 7.2.4.1 Introduction . 40 7.2.4.2 Compatible services and codecs . 40 7.2.4.3 Specification. 40 7.2.5 PP Type 1c: HATS-tested "standard" narrowband handset . 41 7.2.5.1 Introduction . 41 7.2.5.2 Compatible services and codecs . 41 7.2.5.3 Specification. 41 7.2.6 PP Type 1d: HATS-tested "improved" narrowband handset . 41 7.2.6.1 Introduction . 41 7.2.6.2 Compatible services and codecs . 41 7.2.6.3 Specification. 41 7.2.7 PP Type 3a: HATS tested narrowband "standard" loudspeaking handsfree . 42 7.2.7.1 Introduction . 42 7.2.7.2 Compatible services and codecs . 42 7.2.7.3 Specification. 42 7.2.8 PP Type 3b: HATS tested narrowband "improved" loudspeaking handsfree . 42 7.2.8.1 Introduction . 42 7.2.8.2 Compatible services and codecs . 42 7.2.8.3 Specification. 42 7.2.9 PP Type 2a: P.311-tested wideband handset. 43 7.2.9.1 Introduction . 43 7.2.9.2 Compatible services and codecs . 43 7.2.9.3 Specification. 43 7.2.10 PP Type 2b: HATS-tested "standard" wideband handset or headset . 43 7.2.10.1 Introduction . 43 7.2.10.2 Compatible services and codecs . 43 7.2.10.3 Specification. 43 7.2.11 PP Type 2c: HATS tested "improved" wideband handset or headset . 44 7.2.11.1 Introduction . 44 7.2.11.2 Compatible services and codecs . 44 7.2.11.3 Specification. 44 7.2.12 PP Type 4a: HATS tested wideband "standard" loudspeaking handsfree . 44 7.2.12.1 Introduction . 44 7.2.12.2 Compatible services and codecs . 44 7.2.12.3 Specification. 44 7.2.13 PP Type 4b: HATS tested wideband "improved" loudspeaking and handsfree . 45 7.2.13.1 Introduction . 45 7.2.13.2 Compatible services and codecs . 45 7.2.13.3 Specification. 45 7.2.14 PP Type 5a: super-wideband 14 kHz handset . 45 7.2.14.1 Introduction . 45 7.2.14.2 Compatible services and codecs . 45 SIST EN 300 175-8 V2.7.1:2018
ETSI ETSI EN 300 175-8 V2.7.1 (2017-11) 5 7.2.14.3 Specification. 45 7.2.15 PP Type 5b: super-wideband 14 kHz loudspeaking handsfree . 45 7.2.15.1 Introduction . 45 7.2.15.2 Compatible services and codecs . 45 7.2.15.3 Specification. 45 7.2.16 PP Type 6: PPs with external 2 wire, 3,1 kHz telephony interface . 46 7.2.16.1 Introduction . 46 7.2.16.2 Compatible services and codecs . 46 7.2.16.3 Specification. 46 7.3 Audio transmission types applicable to Fixed Parts . 46 7.3.0 General . 46 7.3.1 FP Type 0: Reference FP (ReFP) . 46 7.3.2 FP Type 1a: "classical" Fixed Part for ISDN Network . 47 7.3.2.1 Introduction . 47 7.3.2.2 Compatible services and codecs . 47 7.3.2.3 Specifications . 47 7.3.2.3.1 Transcoding and equalization . 47 7.3.2.3.2 PP type detection . 48 7.3.2.3.3 Activation of audio processing functions . 48 7.3.2.3.4 Transmission specification . 48 7.3.3 FP Type 1b: "new" Fixed Part for ISDN Network . 48 7.3.3.1 Introduction . 48 7.3.3.2 Compatible services and codecs . 49 7.3.3.3 Specification. 49 7.3.3.3.1 Transcoding and equalization . 49 7.3.3.3.2 PP type detection . 49 7.3.3.3.3 Activation of audio processing functions . 49 7.3.3.3.4 Transmission specification . 50 7.3.4 FP Type 2: FP with analog 2-wire interface, 3,1 kHz service . 50 7.3.4.1 Introduction . 50 7.3.4.2 Compatible services, physical interfaces and codecs . 50 7.3.4.3 Specification. 50 7.3.4.3.1 Transcoding, equalization and conversion . 50 7.3.4.3.2 PP type detection and activation of audio processing functions . 51 7.3.4.3.3 Transmission specification . 51 7.3.5 FP Type 3: VoIP narrowband Fixed Part . 51 7.3.5.1 Introduction . 51 7.3.5.2 Compatible services, physical interfaces and codecs . 51 7.3.5.3 Specification. 52 7.3.5.3.1 Transcoding and equalization . 52 7.3.5.3.2 PP type detection . 52 7.3.5.3.3 Activation of audio processing functions . 52 7.3.5.3.4 Transmission specification . 53 7.3.6 FP Type 4: ISDN wideband Fixed Part . 53 7.3.6.1 Introduction . 53 7.3.6.2 Compatible services and codecs . 53 7.3.6.3 Specification. 54 7.3.6.3.1 Transcoding and equalization . 54 7.3.6.3.2 PP type detection . 54 7.3.6.3.3 Activation of audio processing functions . 54 7.3.6.3.4 Transmission specification . 54 7.3.7 FP Type 5: VoIP wideband Fixed Part . 55 7.3.7.1 Introduction . 55 7.3.7.2 Compatible services, physical interfaces and codecs . 55 7.3.7.3 Specification. 55 7.3.7.3.1 Transcoding and equalization . 55 7.3.7.3.2 PP type detection . 55 7.3.7.3.3 Activation of audio processing functions . 56 7.3.7.3.4 Transmission specification . 56 7.3.8 FP Type 6a: FP handling an Internal call inside a DECT FP (any service) . 56 7.3.8.1 Introduction . 56 7.3.8.2 Compatible services, physical interfaces and codecs . 56 SIST EN 300 175-8 V2.7.1:2018
ETSI ETSI EN 300 175-8 V2.7.1 (2017-11) 6 7.3.8.3 Specification. 57 7.3.9 FP Type 6b: FP handling an n-party conference inside a DECT FP (any service) . 57 7.3.9.1 Introduction . 57 7.3.9.2 Compatible services, physical interfaces and codecs . 57 7.3.9.3 Specification for the conference bridge. 57 7.3.10 FP Type 7: DECT Repeater part (REP) . 57 7.3.10.1 Introduction . 57 7.3.10.2 Compatible services, physical interfaces and codecs . 57 7.3.10.3 Specification. 57 7.4 Additional features . 58 7.4.1 Introduction. 58 7.4.2 Echo canceller in Fixed Part . 58 7.4.3 Echo suppressor in Fixed Part. 59 7.5 Transmission characteristics for Portable Parts . 59 7.5.1 Transmission characteristics for Portable Part type 1a ("Classic GAP" handset) . 59 7.5.1.1 PP frequency responses . 59 7.5.1.1.1 Sending . 59 7.5.1.1.2 Receiving . 60 7.5.1.2 PP sending and receiving loudness ratings . 60 7.5.1.2.1 Nominal values . 60 7.5.1.2.2 User-controlled volume control in PP . 60 7.5.1.2.3 PP adaptive volume control . 61 7.5.1.3 Sidetone . 61 7.5.1.3.1 Talker sidetone . 61 7.5.1.3.2 Listener sidetone . 61 7.5.1.4 Terminal coupling loss . 62 7.5.1.4.1 Weighted Terminal Coupling Loss (TCLw) . 62 7.5.1.4.2 Stability loss . 62 7.5.1.5 Distortion . 62 7.5.1.5.1 Sending . 62 7.5.1.5.2 Receiving . 63 7.5.1.5.3 Sidetone . 63 7.5.1.6 Out of band signals. 63 7.5.1.6.1 Sending (discrimination against out of band input signals) . 63 7.5.1.6.2 Receiving (spurious out of band signals) . 63 7.5.1.7 Noise . 63 7.5.1.7.1 Sending . 63 7.5.1.7.2 Band-limited noise. 63 7.5.1.7.3 Receiving . 63 7.5.1.7.4 Level of sampling frequency (receiving) . 64 7.5.1.8 Acoustic shock . 64 7.5.1.8.0 General . 64 7.5.1.8.1 Continuous signal . 64 7.5.1.8.2 Peak signal . 64 7.5.1.9 PP Delay . 64 7.5.1.10 PP ambient noise rejection . 64 7.5.2 Additional requirements for PP type 1b ("improved GAP" handset) . 64 7.5.2.0 General . 64 7.5.2.1 Terminal coupling loss . 64 7.5.2.1.1 Weighted Terminal Coupling Loss (TCLw) . 64 7.5.2.2 Attenuation Range in Sending Direction during Double Talk AH,S,dt . 65 7.5.2.3 Attenuation Range in Receiving Direction during Double Talk AH,R,dt . 65 7.5.2.4 Activation in Sending Direction . 65 7.5.2.5 Activation in Receiving Direction . 66 7.5.3 Transmission characteristics for PP types 1c and 1d (HATS tested, narrowband telephony handsets) . 66 7.5.3.1 PP frequency responses . 66 7.5.3.1.1 Sending . 66 7.5.3.1.2 Receiving . 67 7.5.3.2 PP sending and receiving loudness ratings . 69 7.5.3.2.1 Nominal values . 69 7.5.3.2.2 User-controlled volume control in PP . 70 7.5.3.2.3 PP adaptive volume control . 70 SIST EN 300 175-8 V2.7.1:2018
ETSI ETSI EN 300 175-8 V2.7.1 (2017-11) 7 7.5.3.3 Sidetone . 71 7.5.3.3.1 Talker sidetone . 71 7.5.3.3.2 D Factor . 71 7.5.3.3.3 Sidetone delay . 71 7.5.3.4 Terminal coupling loss . 71 7.5.3.4.1 TCLw of Portable Part . 71 7.5.3.4.2 Stability loss . 72 7.5.3.5 Distortion . 72 7.5.3.5.1 Sending Distortion . 72 7.5.3.5.2 Receiving Distortion . 72 7.5.3.6 Out of band signals. 72 7.5.3.6.1 Out-of-band Signals in Send direction . 72 7.5.3.6.2 Out-of-band signals in receiving direction . 73 7.5.3.7 Noise . 73 7.5.3.7.1 Sending . 73 7.5.3.7.2 Receiving . 73 7.5.3.8 Acoustic shock . 74 7.5.3.8.0 General . 74 7.5.3.8.1 Continuous signal . 74 7.5.3.8.2 Peak signal . 74 7.5.3.9 Delay . 74 7.5.3.10 Variation of gain with input level-sending . 74 7.5.3.11 Double Talk Performance . 75 7.5.3.11.0 General . 75 7.5.3.11.1 Attenuation Range in Sending Direction during Double Talk AH,S,dt . 75 7.5.3.11.2 Attenuation Range in Receiving Direction during Double Talk AH,S,dt . 75 7.5.3.11.3 Detection of Echo Components during Double Talk . 76 7.5.3.11.4 Minimum activation level and sensitivity of double talk detection . 76 7.5.3.12 Switching characteristics . 76 7.5.3.12.0 General . 76 7.5.3.12.1 Activation in Sending Direction .
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Frequently Asked Questions
SIST EN 300 175-8 V2.7.1:2018 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part 8: Speech and audio coding and transmission". This standard covers: The present document is one of the parts of the specification of the Digital Enhanced Cordless Telecommunications (DECT) Common Interface (CI). This part of the DECT CI specifies the speech and audio coding and transmission requirements. In order to ensure satisfactory interworking of different portable and fixed units, it is necessary to specify the transmission performance of the analog information over the digital link. This requires not only use of a common speech algorithm, but also standardization of frequency responses, reference speech levels (or loudness) at the air interface and various other parameters. The present document applies to DECT equipment which includes all the necessary functions to provide real-time two-way speech conversation. Several speech services are defined in the present document, including conventional 3,1 kHz telephony, wideband 7 kHz voice transmission and super-wideband 14 kHz service. DECT Fixed part providing such services may be connected to the public circuit switched (PSTN/ISDN) network, to private networks or to the Internet. Tethered fixed point local loop applications are not required to comply with the requirements of the present document. For the DECT systems which connect to the Public Switched Telephone Network (PSTN) via an analog interface, the additional requirements, which are implemented in the FP, have as much as possible been aligned with ETSI TBR 038 [29]. A summary of the control and the use of the DECT echo control functions, to guide on need for options to manufacturers and installers, is found in annex A. Information concerning test methods can be found in ETSI EN 300 176-1 [9] and ETSI EN 300 176-2 [10] (previously covered by ETSI TBR 010 [i.5]). The test methods take into account that DECT is a digital system. The present document includes New Generation DECT, a further development of the DECT standard introducing wideband speech, improved data services, new slot types and other technical enhancements.
The present document is one of the parts of the specification of the Digital Enhanced Cordless Telecommunications (DECT) Common Interface (CI). This part of the DECT CI specifies the speech and audio coding and transmission requirements. In order to ensure satisfactory interworking of different portable and fixed units, it is necessary to specify the transmission performance of the analog information over the digital link. This requires not only use of a common speech algorithm, but also standardization of frequency responses, reference speech levels (or loudness) at the air interface and various other parameters. The present document applies to DECT equipment which includes all the necessary functions to provide real-time two-way speech conversation. Several speech services are defined in the present document, including conventional 3,1 kHz telephony, wideband 7 kHz voice transmission and super-wideband 14 kHz service. DECT Fixed part providing such services may be connected to the public circuit switched (PSTN/ISDN) network, to private networks or to the Internet. Tethered fixed point local loop applications are not required to comply with the requirements of the present document. For the DECT systems which connect to the Public Switched Telephone Network (PSTN) via an analog interface, the additional requirements, which are implemented in the FP, have as much as possible been aligned with ETSI TBR 038 [29]. A summary of the control and the use of the DECT echo control functions, to guide on need for options to manufacturers and installers, is found in annex A. Information concerning test methods can be found in ETSI EN 300 176-1 [9] and ETSI EN 300 176-2 [10] (previously covered by ETSI TBR 010 [i.5]). The test methods take into account that DECT is a digital system. The present document includes New Generation DECT, a further development of the DECT standard introducing wideband speech, improved data services, new slot types and other technical enhancements.
SIST EN 300 175-8 V2.7.1:2018 is classified under the following ICS (International Classification for Standards) categories: 33.070.30 - Digital Enhanced Cordless Telecommunications (DECT). The ICS classification helps identify the subject area and facilitates finding related standards.
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