ETSI EN 300 175-8 V2.8.1 (2019-12)
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
REN/DECT-00328
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 in prenos stereo zvoka. 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, super širokopasovno storitvijo na frekvenci 14 kHz in polnopasovno storitvijo na frekvenci 20 kHz. Fiksni del digitalnih izboljšanih brezvrvičnih telekomunikacij, ki zagotavlja takšne storitve, je lahko povezan z omrežjem PSTN/ISDN, zasebnimi omrežji ali omrežjem prek internetnega protokola (VoIP). Ni nujno, 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 DECT 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] (pred tem so bile zajete v standardu ETSI TBR 010 [i.5]). Pri preskusnih 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. Poleg tega ta dokument vključuje razvoj digitalne izboljšane brezvrvične telekomunikacije, ki zagotavlja govorne in avdio zmogljivosti za SWB in FB ter nov algoritem kodiranja govora za storitvi NB in WB, kar omogoča večjo kakovost zvoka govornih storitev NB in WB ter izboljšuje zmogljivost pasovne širine.
General Information
Overview
ETSI EN 300 175-8 V2.8.1 (2019-12) specifies speech and audio coding and transmission for the DECT (Digital Enhanced Cordless Telecommunications) Common Interface (CI). It defines how analog speech and audio are represented, coded and transmitted across DECT radio links so different portable parts (PP) and fixed parts (FP) interwork reliably. The standard covers narrowband (3.1 kHz), wideband (7 kHz), super‑wideband (14 kHz) and fullband (20 kHz) services, and includes provisions for New Generation DECT and DECT Evolution (SWB/FB and new speech codecs).
Key topics and technical requirements
- Speech and audio codecs: normative support and characteristics for multiple codecs (examples in the standard include G.726 ADPCM, G.711 PCM, G.722 wideband, G.729.1, MPEG‑4 ER AAC‑LD and LC3plus modes for NB/WB/SWB/FB).
- Encoding and bit‑rate modes: definitions of gross bit rates and supported codec configurations for DECT services.
- Transmission performance: standardized frequency responses, reference speech levels (loudness), relative levels and gain/volume control to ensure consistent audio quality across devices.
- Audio types and device classes: audio type definitions and performance levels for Portable Parts (handsets, handsfree) and Fixed Parts, including HATS-tested classes and reference PPs.
- Interconnection scenarios: requirements for FP interfaces to PSTN/ISDN, private networks and VoIP; alignment of analog FP requirements with ETSI TBR 038 where applicable.
- Packet loss and echo management: optional Packet Loss Concealment (PLC) algorithms for some codecs and guidance on DECT echo control (annex A) to assist manufacturers and installers.
- Test methods and conformance: references to ETSI EN 300 176‑1 and EN 300 176‑2 for test procedures adapted to digital DECT systems.
Practical applications and who uses this standard
- DECT device manufacturers: to implement compliant speech/audio codecs, volume control, interfaces and product audio types.
- Fixed part (base station) designers: to ensure FP behavior when connecting to PSTN/ISDN or VoIP and to meet analog/digital interface audio requirements.
- Network integrators and VoIP equipment vendors: to achieve interoperable DECT telephony and high‑quality wideband/SWB/FB audio over heterogeneous networks.
- Test labs and certification bodies: to validate codec support, frequency response, loudness levels and echo/PLC performance per referenced ETSI test methods.
- Standards professionals and product planners: to map DECT capabilities (New Generation DECT, DECT Evolution) to service offers such as handsfree, loudspeaking and broadband voice.
Related standards
- ETSI EN 300 176‑1 and EN 300 176‑2 (test methods for DECT audio)
- ETSI TBR 038 (analog FP alignment for PSTN interfaces)
- Codec specifications referenced within (G.711, G.722, G.726, G.729.1, MPEG‑4 ER AAC‑LD, LC3plus)
This standard is essential when building interoperable, high‑quality DECT voice solutions and ensuring consistent audio performance across handsets, base stations and network interconnections. Keywords: DECT, speech coding, audio coding, wideband, super‑wideband, fullband, codec, VoIP, PSTN, LC3plus, G.722.
Standards Content (Sample)
Draft ETSI EN 300 175-8 V2.7.14 (2019-08)
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 V2.7.14 (2019-08)
Reference
REN/DECT-00328
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 prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
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 2019.
All rights reserved.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.
3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners. ®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
3 Draft ETSI EN 300 175-8 V2.7.14 (2019-08)
Contents
Intellectual Property Rights . 15
Foreword . 15
Modal verbs terminology . 15
1 Scope . 16
2 References . 16
2.1 Normative references . 16
2.2 Informative references . 18
3 Definition of terms, symbols and abbreviations . 20
3.1 Terms . 20
3.2 Symbols . 21
3.3 Abbreviations . 22
4 Configurations . 24
4.1 Reference configuration . 24
4.1.1 Basic configuration . 24
4.1.2 Portable Part (PP) . 25
4.1.2.1 Functional organization . 25
4.1.2.2 Volume control . 25
4.1.3 Fixed Part (FP) . 26
4.1.3.1 Digital interface . 26
4.1.3.2 Analog interface . 27
4.1.3.3 FP adaptive volume control . 27
4.1.3.4 Voice over IP (VoIP) interface . 27
4.2 Test configurations . 28
5 Encoding . 28
5.0 General . 28
5.1 32 kbit/s full term (ADPCM) G.726 . 29
5.1.1 Algorithm . 29
5.1.2 Bit sequence . 29
5.1.3 Characteristics of G.726 ADPCM codec . 29
5.2 64 kbit/s PCM G.711 . 29
5.2.1 Algorithm . 29
5.2.2 Bit sequence . 29
5.2.3 Characteristics of G.711 PCM codec . 30
5.2.4 Automatic detection of FAX/modem tone and switch to G.711 . 30
5.3 Wideband speech codec G.722 at 64 kbit/s . 30
5.3.0 General . 30
5.3.1 Algorithm . 30
5.3.2 Bit sequence . 30
5.3.3 Characteristics of G.722 wideband codec . 30
5.3.4 Optional Packet Loss Concealment algorithm (PLC) . 31
5.4 Wideband speech codec G.729.1 up to 32 kbit/s . 31
5.4.1 Algorithm . 31
5.4.2 Bit sequence . 31
5.4.3 Characteristics of G.729.1 codec . 31
5.4.4 Packet Loss Concealment algorithm (PLC) . 32
5.4.5 Supported bit rate in DECT . 32
5.5 Super-wideband MPEG-4 speech and audio coding . 32
5.5.1 Algorithm . 32
5.5.2 64 kbit/s, MPEG-4 ER AAC-LD codec . 33
5.5.3 32 kbit/s, MPEG-4 ER AAC-LD codec . 33
5.6 Narrowband, wideband and super-wideband/fullband LC3plus speech and audio coding . 34
5.6.1 Algorithm . 34
5.6.2 NB mode at 32 kbit/s gross bit rate . 34
5.6.3 WB mode at 32 kbit/s gross bit rate . 35
ETSI
4 Draft ETSI EN 300 175-8 V2.7.14 (2019-08)
5.6.4 SWB mode at 64 kbit/s gross bit rate . 35
5.6.5 FB mode at 64 kbit/s gross bit rate . 35
5.6.6 FB mode at 96 kbit/s gross bit rate . 36
5.6.7 FB mode at 128 kbit/s gross bit rate . 36
6 Transmission aspects . 37
6.1 Relative level . 37
6.2 Acoustic reference level . 37
6.3 Volume control . 37
7 Audio specifications . 37
7.1 Overall description . 37
7.1.1 Introduction to DECT audio specifications . 37
7.1.2 Introduction to the audio types . 37
7.1.3 List of Audio types . 38
7.1.4 Audio types for Portable Parts . 39
7.1.5 Audio types for Fixed Parts . 40
7.1.6 Complete DECT system . 40
7.1.7 Structure of the specification of the audio types . 40
7.1.8 Audio Types and codecs . 48
7.1.9 Audio Types and physical interfaces . 48
7.2 Audio types applicable to Portable Parts . 48
7.2.0 General . 48
7.2.1 Performance levels of DECT Portable Parts (handsets). 48
7.2.2 Type 0: Reference PP (RePP) . 49
7.2.3 PP Type 1a: "Classic" GAP narrowband handset . 50
7.2.3.1 Introduction . 50
7.2.3.2 Compatible services and codecs . 50
7.2.3.3 Specification. 50
7.2.4 PP Type 1b: "Improved" GAP narrowband handset . 50
7.2.4.1 Introduction . 50
7.2.4.2 Compatible services and codecs . 51
7.2.4.3 Specification. 51
7.2.5 PP Type 1c: HATS-tested "standard" narrowband handset . 51
7.2.5.1 Introduction . 51
7.2.5.2 Compatible services and codecs . 51
7.2.5.3 Specification. 51
7.2.6 PP Type 1d: HATS-tested "improved" narrowband handset . 52
7.2.6.1 Introduction . 52
7.2.6.2 Compatible services and codecs . 52
7.2.6.3 Specification. 52
7.2.7 PP Type 3a: HATS tested narrowband "standard" loudspeaking handsfree . 52
7.2.7.1 Introduction . 52
7.2.7.2 Compatible services and codecs . 52
7.2.7.3 Specification. 53
7.2.8 PP Type 3b: HATS tested narrowband "improved" loudspeaking handsfree . 53
7.2.8.1 Introduction . 53
7.2.8.2 Compatible services and codecs . 53
7.2.8.3 Specification. 53
7.2.9 PP Type 2a: P.311-tested wideband handset. 53
7.2.9.1 Introduction . 53
7.2.9.2 Compatible services and codecs . 53
7.2.9.3 Specification. 53
7.2.10 PP Type 2b: HATS-tested "standard" wideband handset or headset . 54
7.2.10.1 Introduction . 54
7.2.10.2 Compatible services and codecs . 54
7.2.10.3 Specification. 54
7.2.11 PP Type 2c: HATS tested "improved" wideband handset or headset . 54
7.2.11.1 Introduction . 54
7.2.11.2 Compatible services and codecs . 54
7.2.11.3 Specification. 54
7.2.12 PP Type 4a: HATS tested wideband "standard" loudspeaking handsfree . 55
ETSI
5 Draft ETSI EN 300 175-8 V2.7.14 (2019-08)
7.2.12.1 Introduction . 55
7.2.12.2 Compatible services and codecs . 55
7.2.12.3 Specification. 55
7.2.13 PP Type 4b: HATS tested wideband "improved" loudspeaking and handsfree . 55
7.2.13.1 Introduction . 55
7.2.13.2 Compatible services and codecs . 55
7.2.13.3 Specification. 55
7.2.14 PP Type 5a: super-wideband 14 kHz handset or headset. 56
7.2.14.1 Introduction . 56
7.2.14.2 Compatible services and codecs . 56
7.2.14.3 Specification. 56
7.2.15 PP Type 5b: super-wideband 14 kHz loudspeaking handsfree . 56
7.2.15.1 Introduction . 56
7.2.15.2 Compatible services and codecs . 56
7.2.15.3 Specification. 56
7.2.16 PP Type 6: PPs with external 2 wire, 3,1 kHz telephony interface . 56
7.2.16.1 Introduction . 56
7.2.16.2 Compatible services and codecs . 56
7.2.16.3 Specification. 56
7.2.17 PP Type 7a: fullband 20 kHz handset or headset . 56
7.2.17.1 Introduction . 56
7.2.17.2 Compatible services and codecs . 57
7.2.17.3 Specification. 57
7.2.18 PP Type 7b: fullband 20 kHz loudspeaking handsfree . 57
7.2.18.1 Introduction . 57
7.2.18.2 Compatible services and codecs . 57
7.2.18.3 Specification. 57
7.2.19 PP Type 7c, d, e: fullband 20 kHz stereo audio device . 57
7.2.19.1 Introduction . 57
7.2.19.2 Compatible services and codecs . 57
7.2.19.3 Specification. 57
7.3 Audio transmission types applicable to Fixed Parts . 57
7.3.0 General . 57
7.3.1 FP Type 0: Reference FP (ReFP) . 58
7.3.2 FP Type 1a: "classical" Fixed Part for ISDN Network . 58
7.3.2.1 Introduction . 58
7.3.2.2 Compatible services and codecs . 59
7.3.2.3 Specifications . 59
7.3.2.3.1 Transcoding and equalization . 59
7.3.2.3.2 PP type detection . 59
7.3.2.3.3 Activation of audio processing functions . 59
7.3.2.3.4 Transmission specification . 60
7.3.3 FP Type 1b: Fixed Part for ISDN Network . 60
7.3.3.1 Introduction . 60
7.3.3.2 Compatible services and codecs . 60
7.3.3.3 Specification. 60
7.3.3.3.1 Transcoding and equalization . 60
7.3.3.3.2 PP type detection . 61
7.3.3.3.3 Activation of audio processing functions . 61
7.3.3.3.4 Transmission specification . 61
7.3.4 FP Type 2: FP with analog 2-wire interface, 3,1 kHz service . 61
7.3.4.1 Introduction . 61
7.3.4.2 Compatible services, physical interfaces and codecs . 62
7.3.4.3 Specification. 62
7.3.4.3.1 Transcoding, equalization and conversion . 62
7.3.4.3.2 PP type detection and activation of audio processing functions . 62
7.3.4.3.3 Transmission specification . 62
7.3.5 FP Type 3: VoIP narrowband Fixed Part . 62
7.3.5.1 Introduction . 62
7.3.5.2 Compatible services, physical interfaces and codecs . 63
7.3.5.3 Specification. 63
7.3.5.3.1 Transcoding and equalization . 63
ETSI
6 Draft ETSI EN 300 175-8 V2.7.14 (2019-08)
7.3.5.3.2 PP type detection . 64
7.3.5.3.3 Activation of audio processing functions . 64
7.3.5.3.4 Transmission specification . 64
7.3.6 FP Type 4: ISDN wideband Fixed Part . 65
7.3.6.1 Introduction . 65
7.3.6.2 Compatible services and codecs . 65
7.3.6.3 Specification. 65
7.3.6.3.1 Transcoding and equalization . 65
7.3.6.3.2 PP type detection . 65
7.3.6.3.3 Activation of audio processing functions . 65
7.3.6.3.4 Transmission specification . 66
7.3.7 FP Type 5: VoIP wideband, super-wideband or fullband Fixed Part . 66
7.3.7.1 Introduction . 66
7.3.7.2 Compatible services, physical interfaces and codecs . 66
7.3.7.3 Specification. 67
7.3.7.3.1 Transcoding and equalization . 67
7.3.7.3.2 PP type detection . 67
7.3.7.3.3 Activation of audio processing functions . 67
7.3.7.3.4 Transmission specification . 68
7.3.8 FP Type 6a: FP handling an Internal call inside a DECT FP (any service) . 68
7.3.8.1 Introduction . 68
7.3.8.2 Compatible services, physical interfaces and codecs . 68
7.3.8.3 Specification. 68
7.3.9 FP Type 6b: FP handling an n-party conference inside a DECT FP (any service) . 68
7.3.9.1 Introduction . 68
7.3.9.2 Compatible services, physical interfaces and codecs . 68
7.3.9.3 Specification for the conference bridge. 69
7.3.10 FP Type 7: DECT Repeater Part (REP) . 69
7.3.10.1 Introduction . 69
7.3.10.2 Compatible services, physical interfaces and codecs . 69
7.3.10.3 Specification. 69
7.4 Additional features . 69
7.4.1 Introduction. 69
7.4.2 Echo canceller in Fixed Part . 70
7.4.3 Echo suppressor in Fixed Part. 70
7.5 Transmission characteristics for Portable Parts . 71
7.5.1 Transmission characteristics for Portable Part type 1a ("Classic GAP" handset) . 71
7.5.1.1 PP frequency responses . 71
7.5.1.1.1 Sending . 71
7.5.1.1.2 Receiving . 72
7.5.1.2 PP sending and receiving loudness ratings . 72
7.5.1.2.1 Nominal values . 72
7.5.1.2.2 User-controlled volume control in PP . 72
7.5.1.2.3 PP adaptive volume control . 73
7.5.1.3 Sidetone . 73
7.5.1.3.1 Talker sidetone . 73
7.5.1.3.2 Listener sidetone . 74
7.5.1.4 Terminal coupling loss . 74
7.5.1.4.1 Weighted Terminal Coupling Loss (TCLw) . 74
7.5.1.4.2 Stability loss . 74
7.5.1.5 Distortion . 75
7.5.1.5.1 Sending . 75
7.5.1.5.2 Receiving . 75
7.5.1.5.3 Sidetone . 75
7.5.1.6 Out of band signals. 75
7.5.1.6.1 Sending (discrimination against out of band input signals) . 75
7.5.1.6.2 Receiving (spurious out of band signals) . 76
7.5.1.7 Noise . 76
7.5.1.7.1 Sending . 76
7.5.1.7.2 Band-limited noise. 76
7.5.1.7.3 Receiving . 76
7.5.1.7.4 Level of sampling frequency (receiving) . 77
ETSI
7 Draft ETSI EN 300 175-8 V2.7.14 (2019-08)
7.5.1.8 Acoustic shock . 77
7.5.1.8.0 General . 77
7.5.1.8.1 Continuous signal . 77
7.5.1.8.2 Peak signal . 77
7.5.1.9 PP Delay . 77
7.5.1.10 PP ambient noise rejection . 77
7.5.2 Additional requirements for PP type 1b ("improved GAP" handset) . 78
7.5.2.0 General . 78
7.5.2.1 Terminal coupling loss . 78
7.5.2.1.1 Weighted Terminal Coupling Loss (TCLw) . 78
7.5.2.2 Attenuation Range in Sending Direction during Double Talk A . 78
H,S,dt
7.5.2.3 Attenuation Range in Receiving Direction during Double Talk A . 78
H,R,dt
7.5.2.4 Activation in Sending Direction . 79
7.5.2.5 Activation in Receiving Direction . 79
7.5.3 Transmission characteristics for PP types 1c and 1d (HATS tested, narrowband telephony handsets) . 80
7.5.3.1 Frequency responses . 80
7.5.3.1.1 Sending . 80
7.5.3.1.2 Receiving . 81
7.5.3.2 Sending and receiving loudness ratings . 83
7.5.3.2.1 Nominal values . 83
7.5.3.2.2 Void . 83
7.5.3.2.3 Void . 83
7.5.3.2.4 Microphone mute. 83
7.5.3.2.5 Positional robustness . 84
7.5.3.3 Sidetone . 84
7.5.3.3.1 Sidetone masking rating (STMR) . 84
7.5.3.3.2 Void . 84
7.5.3.3.3 Sidetone delay . 84
7.5.3.4 Terminal coupling loss . 84
7.5.3.4.1 Terminal Coupling Loss weighted (TCLw). 84
7.5.3.4.2 Stability loss . 85
7.5.3.5 Distortion .
...
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 8: Speech and audio coding and transmission
2 ETSI EN 300 175-8 V2.8.1 (2019-12)
Reference
REN/DECT-00328
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 prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
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 2019.
All rights reserved.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.
3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners. ®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
3 ETSI EN 300 175-8 V2.8.1 (2019-12)
Contents
Intellectual Property Rights . 15
Foreword . 15
Modal verbs terminology . 15
1 Scope . 16
2 References . 16
2.1 Normative references . 16
2.2 Informative references . 18
3 Definition of terms, symbols and abbreviations . 20
3.1 Terms . 20
3.2 Symbols . 21
3.3 Abbreviations . 22
4 Configurations . 24
4.1 Reference configuration . 24
4.1.1 Basic configuration . 24
4.1.2 Portable Part (PP) . 25
4.1.2.1 Functional organization . 25
4.1.2.2 Volume control . 25
4.1.3 Fixed Part (FP) . 26
4.1.3.1 Digital interface . 26
4.1.3.2 Analog interface . 27
4.1.3.3 FP adaptive volume control . 27
4.1.3.4 Voice over IP (VoIP) interface . 27
4.2 Test configurations . 28
5 Encoding . 28
5.0 General . 28
5.1 32 kbit/s full term (ADPCM) G.726 . 29
5.1.1 Algorithm . 29
5.1.2 Bit sequence . 29
5.1.3 Characteristics of G.726 ADPCM codec . 29
5.2 64 kbit/s PCM G.711 . 29
5.2.1 Algorithm . 29
5.2.2 Bit sequence . 29
5.2.3 Characteristics of G.711 PCM codec . 30
5.2.4 Automatic detection of FAX/modem tone and switch to G.711 . 30
5.3 Wideband speech codec G.722 at 64 kbit/s . 30
5.3.0 General . 30
5.3.1 Algorithm . 30
5.3.2 Bit sequence . 30
5.3.3 Characteristics of G.722 wideband codec . 30
5.3.4 Optional Packet Loss Concealment algorithm (PLC) . 31
5.4 Wideband speech codec G.729.1 up to 32 kbit/s . 31
5.4.1 Algorithm . 31
5.4.2 Bit sequence . 31
5.4.3 Characteristics of G.729.1 codec . 31
5.4.4 Packet Loss Concealment algorithm (PLC) . 32
5.4.5 Supported bit rate in DECT . 32
5.5 Super-wideband MPEG-4 speech and audio coding . 32
5.5.1 Algorithm . 32
5.5.2 64 kbit/s, MPEG-4 ER AAC-LD codec . 33
5.5.3 32 kbit/s, MPEG-4 ER AAC-LD codec . 33
5.6 Narrowband, wideband and super-wideband/fullband LC3plus speech and audio coding . 34
5.6.1 Algorithm . 34
5.6.2 NB mode at 32 kbit/s gross bit rate . 34
5.6.3 WB mode at 32 kbit/s gross bit rate . 35
ETSI
4 ETSI EN 300 175-8 V2.8.1 (2019-12)
5.6.4 SWB mode at 64 kbit/s gross bit rate . 35
5.6.5 FB mode at 64 kbit/s gross bit rate . 35
5.6.6 FB mode at 96 kbit/s gross bit rate . 36
5.6.7 FB mode at 128 kbit/s gross bit rate . 36
6 Transmission aspects . 37
6.1 Relative level . 37
6.2 Acoustic reference level . 37
6.3 Volume control . 37
7 Audio specifications . 37
7.1 Overall description . 37
7.1.1 Introduction to DECT audio specifications . 37
7.1.2 Introduction to the audio types . 37
7.1.3 List of Audio types . 38
7.1.4 Audio types for Portable Parts . 39
7.1.5 Audio types for Fixed Parts . 40
7.1.6 Complete DECT system . 40
7.1.7 Structure of the specification of the audio types . 40
7.1.8 Audio Types and codecs . 48
7.1.9 Audio Types and physical interfaces . 48
7.2 Audio types applicable to Portable Parts . 48
7.2.0 General . 48
7.2.1 Performance levels of DECT Portable Parts (handsets). 48
7.2.2 Type 0: Reference PP (RePP) . 49
7.2.3 PP Type 1a: "Classic" GAP narrowband handset . 50
7.2.3.1 Introduction . 50
7.2.3.2 Compatible services and codecs . 50
7.2.3.3 Specification. 50
7.2.4 PP Type 1b: "Improved" GAP narrowband handset . 50
7.2.4.1 Introduction . 50
7.2.4.2 Compatible services and codecs . 51
7.2.4.3 Specification. 51
7.2.5 PP Type 1c: HATS-tested "standard" narrowband handset . 51
7.2.5.1 Introduction . 51
7.2.5.2 Compatible services and codecs . 51
7.2.5.3 Specification. 51
7.2.6 PP Type 1d: HATS-tested "improved" narrowband handset . 52
7.2.6.1 Introduction . 52
7.2.6.2 Compatible services and codecs . 52
7.2.6.3 Specification. 52
7.2.7 PP Type 3a: HATS tested narrowband "standard" loudspeaking handsfree . 52
7.2.7.1 Introduction . 52
7.2.7.2 Compatible services and codecs . 52
7.2.7.3 Specification. 53
7.2.8 PP Type 3b: HATS tested narrowband "improved" loudspeaking handsfree . 53
7.2.8.1 Introduction . 53
7.2.8.2 Compatible services and codecs . 53
7.2.8.3 Specification. 53
7.2.9 PP Type 2a: P.311-tested wideband handset. 53
7.2.9.1 Introduction . 53
7.2.9.2 Compatible services and codecs . 53
7.2.9.3 Specification. 53
7.2.10 PP Type 2b: HATS-tested "standard" wideband handset or headset . 54
7.2.10.1 Introduction . 54
7.2.10.2 Compatible services and codecs . 54
7.2.10.3 Specification. 54
7.2.11 PP Type 2c: HATS tested "improved" wideband handset or headset . 54
7.2.11.1 Introduction . 54
7.2.11.2 Compatible services and codecs . 54
7.2.11.3 Specification. 54
7.2.12 PP Type 4a: HATS tested wideband "standard" loudspeaking handsfree . 55
ETSI
5 ETSI EN 300 175-8 V2.8.1 (2019-12)
7.2.12.1 Introduction . 55
7.2.12.2 Compatible services and codecs . 55
7.2.12.3 Specification. 55
7.2.13 PP Type 4b: HATS tested wideband "improved" loudspeaking and handsfree . 55
7.2.13.1 Introduction . 55
7.2.13.2 Compatible services and codecs . 55
7.2.13.3 Specification. 55
7.2.14 PP Type 5a: super-wideband 14 kHz handset or headset. 56
7.2.14.1 Introduction . 56
7.2.14.2 Compatible services and codecs . 56
7.2.14.3 Specification. 56
7.2.15 PP Type 5b: super-wideband 14 kHz loudspeaking handsfree . 56
7.2.15.1 Introduction . 56
7.2.15.2 Compatible services and codecs . 56
7.2.15.3 Specification. 56
7.2.16 PP Type 6: PPs with external 2 wire, 3,1 kHz telephony interface . 56
7.2.16.1 Introduction . 56
7.2.16.2 Compatible services and codecs . 56
7.2.16.3 Specification. 56
7.2.17 PP Type 7a: fullband 20 kHz handset or headset . 56
7.2.17.1 Introduction . 56
7.2.17.2 Compatible services and codecs . 57
7.2.17.3 Specification. 57
7.2.18 PP Type 7b: fullband 20 kHz loudspeaking handsfree . 57
7.2.18.1 Introduction . 57
7.2.18.2 Compatible services and codecs . 57
7.2.18.3 Specification. 57
7.2.19 PP Type 7c, d, e: fullband 20 kHz stereo audio device . 57
7.2.19.1 Introduction . 57
7.2.19.2 Compatible services and codecs . 57
7.2.19.3 Specification. 57
7.3 Audio transmission types applicable to Fixed Parts . 57
7.3.0 General . 57
7.3.1 FP Type 0: Reference FP (ReFP) . 58
7.3.2 FP Type 1a: "classical" Fixed Part for ISDN Network . 58
7.3.2.1 Introduction . 58
7.3.2.2 Compatible services and codecs . 59
7.3.2.3 Specifications . 59
7.3.2.3.1 Transcoding and equalization . 59
7.3.2.3.2 PP type detection . 59
7.3.2.3.3 Activation of audio processing functions . 59
7.3.2.3.4 Transmission specification . 60
7.3.3 FP Type 1b: Fixed Part for ISDN Network . 60
7.3.3.1 Introduction . 60
7.3.3.2 Compatible services and codecs . 60
7.3.3.3 Specification. 60
7.3.3.3.1 Transcoding and equalization . 60
7.3.3.3.2 PP type detection . 61
7.3.3.3.3 Activation of audio processing functions . 61
7.3.3.3.4 Transmission specification . 61
7.3.4 FP Type 2: FP with analog 2-wire interface, 3,1 kHz service . 61
7.3.4.1 Introduction . 61
7.3.4.2 Compatible services, physical interfaces and codecs . 62
7.3.4.3 Specification. 62
7.3.4.3.1 Transcoding, equalization and conversion . 62
7.3.4.3.2 PP type detection and activation of audio processing functions . 62
7.3.4.3.3 Transmission specification . 62
7.3.5 FP Type 3: VoIP narrowband Fixed Part . 62
7.3.5.1 Introduction . 62
7.3.5.2 Compatible services, physical interfaces and codecs . 63
7.3.5.3 Specification. 63
7.3.5.3.1 Transcoding and equalization . 63
ETSI
6 ETSI EN 300 175-8 V2.8.1 (2019-12)
7.3.5.3.2 PP type detection . 64
7.3.5.3.3 Activation of audio processing functions . 64
7.3.5.3.4 Transmission specification . 64
7.3.6 FP Type 4: ISDN wideband Fixed Part . 65
7.3.6.1 Introduction . 65
7.3.6.2 Compatible services and codecs . 65
7.3.6.3 Specification. 65
7.3.6.3.1 Transcoding and equalization . 65
7.3.6.3.2 PP type detection . 65
7.3.6.3.3 Activation of audio processing functions . 65
7.3.6.3.4 Transmission specification . 66
7.3.7 FP Type 5: VoIP wideband, super-wideband or fullband Fixed Part . 66
7.3.7.1 Introduction . 66
7.3.7.2 Compatible services, physical interfaces and codecs . 66
7.3.7.3 Specification. 67
7.3.7.3.1 Transcoding and equalization . 67
7.3.7.3.2 PP type detection . 67
7.3.7.3.3 Activation of audio processing functions . 67
7.3.7.3.4 Transmission specification . 68
7.3.8 FP Type 6a: FP handling an Internal call inside a DECT FP (any service) . 68
7.3.8.1 Introduction . 68
7.3.8.2 Compatible services, physical interfaces and codecs . 68
7.3.8.3 Specification. 68
7.3.9 FP Type 6b: FP handling an n-party conference inside a DECT FP (any service) . 68
7.3.9.1 Introduction . 68
7.3.9.2 Compatible services, physical interfaces and codecs . 68
7.3.9.3 Specification for the conference bridge. 69
7.3.10 FP Type 7: DECT Repeater Part (REP) . 69
7.3.10.1 Introduction . 69
7.3.10.2 Compatible services, physical interfaces and codecs . 69
7.3.10.3 Specification. 69
7.4 Additional features . 69
7.4.1 Introduction. 69
7.4.2 Echo canceller in Fixed Part . 70
7.4.3 Echo suppressor in Fixed Part. 70
7.5 Transmission characteristics for Portable Parts . 71
7.5.1 Transmission characteristics for Portable Part type 1a ("Classic GAP" handset) . 71
7.5.1.1 PP frequency responses . 71
7.5.1.1.1 Sending . 71
7.5.1.1.2 Receiving . 72
7.5.1.2 PP sending and receiving loudness ratings . 72
7.5.1.2.1 Nominal values . 72
7.5.1.2.2 User-controlled volume control in PP . 72
7.5.1.2.3 PP adaptive volume control . 73
7.5.1.3 Sidetone . 73
7.5.1.3.1 Talker sidetone . 73
7.5.1.3.2 Listener sidetone . 74
7.5.1.4 Terminal coupling loss . 74
7.5.1.4.1 Weighted Terminal Coupling Loss (TCLw) . 74
7.5.1.4.2 Stability loss . 74
7.5.1.5 Distortion . 75
7.5.1.5.1 Sending . 75
7.5.1.5.2 Receiving . 75
7.5.1.5.3 Sidetone . 75
7.5.1.6 Out of band signals. 75
7.5.1.6.1 Sending (discrimination against out of band input signals) . 75
7.5.1.6.2 Receiving (spurious out of band signals) . 76
7.5.1.7 Noise . 76
7.5.1.7.1 Sending . 76
7.5.1.7.2 Band-limited noise. 76
7.5.1.7.3 Receiving . 76
7.5.1.7.4 Level of sampling frequency (receiving) . 77
ETSI
7 ETSI EN 300 175-8 V2.8.1 (2019-12)
7.5.1.8 Acoustic shock . 77
7.5.1.8.0 General . 77
7.5.1.8.1 Continuous signal . 77
7.5.1.8.2 Peak signal . 77
7.5.1.9 PP Delay . 77
7.5.1.10 PP ambient noise rejection . 77
7.5.2 Additional requirements for PP type 1b ("improved GAP" handset) . 78
7.5.2.0 General . 78
7.5.2.1 Terminal coupling loss . 78
7.5.2.1.1 Weighted Terminal Coupling Loss (TCLw) . 78
7.5.2.2 Attenuation Range in Sending Direction during Double Talk A . 78
H,S,dt
7.5.2.3 Attenuation Range in Receiving Direction during Double Talk A . 78
H,R,dt
7.5.2.4 Activation in Sending Direction . 79
7.5.2.5 Activation in Receiving Direction . 79
7.5.3 Transmission characteristics for PP types 1c and 1d (HATS tested, narrowband telephony handsets) . 80
7.5.3.1 Frequency responses . 80
7.5.3.1.1 Sending . 80
7.5.3.1.2 Receiving . 81
7.5.3.2 Sending and receiving loudness ratings . 83
7.5.3.2.1 Nominal values . 83
7.5.3.2.2 Void . 83
7.5.3.2.3 Void . 83
7.5.3.2.4 Microphone mute. 83
7.5.3.2.5 Positional robustness . 84
7.5.3.3 Sidetone . 84
7.5.3.3.1 Sidetone masking rating (STMR) . 84
7.5.3.3.2 Void . 84
7.5.3.3.3 Sidetone delay . 84
7.5.3.4 Terminal coupling loss . 84
7.5.3.4.1 Terminal Coupling Loss weighted (TCLw). 84
7.5.3.4.2 Stability loss . 85
7.5.3.5 Distortion .
...
SLOVENSKI STANDARD
01-februar-2020
Digitalne izboljšane brezvrvične telekomunikacije (DECT) - Skupni vmesnik (CI) - 8.
del: Kodiranje in prenos govora in zvoka
Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part
8: Speech and audio coding and transmission
Ta slovenski standard je istoveten z: ETSI EN 300 175-8 V2.8.1 (2019-12)
ICS:
33.070.30 Digitalne izboljšane Digital Enhanced Cordless
brezvrvične telekomunikacije Telecommunications (DECT)
(DECT)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 8: Speech and audio coding and transmission
2 ETSI EN 300 175-8 V2.8.1 (2019-12)
Reference
REN/DECT-00328
Keywords
7 kHz, audio, broadband, codec, DECT,
handsfree, IMT-2000, loudspeaking, mobility,
narrowband, quality, radio, speech, TDD, TDMA,
telephony, terminal
ETSI
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Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
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Sous-Préfecture de Grasse (06) N° 7803/88
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ETSI
3 ETSI EN 300 175-8 V2.8.1 (2019-12)
Contents
Intellectual Property Rights . 15
Foreword . 15
Modal verbs terminology . 15
1 Scope . 16
2 References . 16
2.1 Normative references . 16
2.2 Informative references . 18
3 Definition of terms, symbols and abbreviations . 20
3.1 Terms . 20
3.2 Symbols . 21
3.3 Abbreviations . 22
4 Configurations . 24
4.1 Reference configuration . 24
4.1.1 Basic configuration . 24
4.1.2 Portable Part (PP) . 25
4.1.2.1 Functional organization . 25
4.1.2.2 Volume control . 25
4.1.3 Fixed Part (FP) . 26
4.1.3.1 Digital interface . 26
4.1.3.2 Analog interface . 27
4.1.3.3 FP adaptive volume control . 27
4.1.3.4 Voice over IP (VoIP) interface . 27
4.2 Test configurations . 28
5 Encoding . 28
5.0 General . 28
5.1 32 kbit/s full term (ADPCM) G.726 . 29
5.1.1 Algorithm . 29
5.1.2 Bit sequence . 29
5.1.3 Characteristics of G.726 ADPCM codec . 29
5.2 64 kbit/s PCM G.711 . 29
5.2.1 Algorithm . 29
5.2.2 Bit sequence . 29
5.2.3 Characteristics of G.711 PCM codec . 30
5.2.4 Automatic detection of FAX/modem tone and switch to G.711 . 30
5.3 Wideband speech codec G.722 at 64 kbit/s . 30
5.3.0 General . 30
5.3.1 Algorithm . 30
5.3.2 Bit sequence . 30
5.3.3 Characteristics of G.722 wideband codec . 30
5.3.4 Optional Packet Loss Concealment algorithm (PLC) . 31
5.4 Wideband speech codec G.729.1 up to 32 kbit/s . 31
5.4.1 Algorithm . 31
5.4.2 Bit sequence . 31
5.4.3 Characteristics of G.729.1 codec . 31
5.4.4 Packet Loss Concealment algorithm (PLC) . 32
5.4.5 Supported bit rate in DECT . 32
5.5 Super-wideband MPEG-4 speech and audio coding . 32
5.5.1 Algorithm . 32
5.5.2 64 kbit/s, MPEG-4 ER AAC-LD codec . 33
5.5.3 32 kbit/s, MPEG-4 ER AAC-LD codec . 33
5.6 Narrowband, wideband and super-wideband/fullband LC3plus speech and audio coding . 34
5.6.1 Algorithm . 34
5.6.2 NB mode at 32 kbit/s gross bit rate . 34
5.6.3 WB mode at 32 kbit/s gross bit rate . 35
ETSI
4 ETSI EN 300 175-8 V2.8.1 (2019-12)
5.6.4 SWB mode at 64 kbit/s gross bit rate . 35
5.6.5 FB mode at 64 kbit/s gross bit rate . 35
5.6.6 FB mode at 96 kbit/s gross bit rate . 36
5.6.7 FB mode at 128 kbit/s gross bit rate . 36
6 Transmission aspects . 37
6.1 Relative level . 37
6.2 Acoustic reference level . 37
6.3 Volume control . 37
7 Audio specifications . 37
7.1 Overall description . 37
7.1.1 Introduction to DECT audio specifications . 37
7.1.2 Introduction to the audio types . 37
7.1.3 List of Audio types . 38
7.1.4 Audio types for Portable Parts . 39
7.1.5 Audio types for Fixed Parts . 40
7.1.6 Complete DECT system . 40
7.1.7 Structure of the specification of the audio types . 40
7.1.8 Audio Types and codecs . 48
7.1.9 Audio Types and physical interfaces . 48
7.2 Audio types applicable to Portable Parts . 48
7.2.0 General . 48
7.2.1 Performance levels of DECT Portable Parts (handsets). 48
7.2.2 Type 0: Reference PP (RePP) . 49
7.2.3 PP Type 1a: "Classic" GAP narrowband handset . 50
7.2.3.1 Introduction . 50
7.2.3.2 Compatible services and codecs . 50
7.2.3.3 Specification. 50
7.2.4 PP Type 1b: "Improved" GAP narrowband handset . 50
7.2.4.1 Introduction . 50
7.2.4.2 Compatible services and codecs . 51
7.2.4.3 Specification. 51
7.2.5 PP Type 1c: HATS-tested "standard" narrowband handset . 51
7.2.5.1 Introduction . 51
7.2.5.2 Compatible services and codecs . 51
7.2.5.3 Specification. 51
7.2.6 PP Type 1d: HATS-tested "improved" narrowband handset . 52
7.2.6.1 Introduction . 52
7.2.6.2 Compatible services and codecs . 52
7.2.6.3 Specification. 52
7.2.7 PP Type 3a: HATS tested narrowband "standard" loudspeaking handsfree . 52
7.2.7.1 Introduction . 52
7.2.7.2 Compatible services and codecs . 52
7.2.7.3 Specification. 53
7.2.8 PP Type 3b: HATS tested narrowband "improved" loudspeaking handsfree . 53
7.2.8.1 Introduction . 53
7.2.8.2 Compatible services and codecs . 53
7.2.8.3 Specification. 53
7.2.9 PP Type 2a: P.311-tested wideband handset. 53
7.2.9.1 Introduction . 53
7.2.9.2 Compatible services and codecs . 53
7.2.9.3 Specification. 53
7.2.10 PP Type 2b: HATS-tested "standard" wideband handset or headset . 54
7.2.10.1 Introduction . 54
7.2.10.2 Compatible services and codecs . 54
7.2.10.3 Specification. 54
7.2.11 PP Type 2c: HATS tested "improved" wideband handset or headset . 54
7.2.11.1 Introduction . 54
7.2.11.2 Compatible services and codecs . 54
7.2.11.3 Specification. 54
7.2.12 PP Type 4a: HATS tested wideband "standard" loudspeaking handsfree . 55
ETSI
5 ETSI EN 300 175-8 V2.8.1 (2019-12)
7.2.12.1 Introduction . 55
7.2.12.2 Compatible services and codecs . 55
7.2.12.3 Specification. 55
7.2.13 PP Type 4b: HATS tested wideband "improved" loudspeaking and handsfree . 55
7.2.13.1 Introduction . 55
7.2.13.2 Compatible services and codecs . 55
7.2.13.3 Specification. 55
7.2.14 PP Type 5a: super-wideband 14 kHz handset or headset. 56
7.2.14.1 Introduction . 56
7.2.14.2 Compatible services and codecs . 56
7.2.14.3 Specification. 56
7.2.15 PP Type 5b: super-wideband 14 kHz loudspeaking handsfree . 56
7.2.15.1 Introduction . 56
7.2.15.2 Compatible services and codecs . 56
7.2.15.3 Specification. 56
7.2.16 PP Type 6: PPs with external 2 wire, 3,1 kHz telephony interface . 56
7.2.16.1 Introduction . 56
7.2.16.2 Compatible services and codecs . 56
7.2.16.3 Specification. 56
7.2.17 PP Type 7a: fullband 20 kHz handset or headset . 56
7.2.17.1 Introduction . 56
7.2.17.2 Compatible services and codecs . 57
7.2.17.3 Specification. 57
7.2.18 PP Type 7b: fullband 20 kHz loudspeaking handsfree . 57
7.2.18.1 Introduction . 57
7.2.18.2 Compatible services and codecs . 57
7.2.18.3 Specification. 57
7.2.19 PP Type 7c, d, e: fullband 20 kHz stereo audio device . 57
7.2.19.1 Introduction . 57
7.2.19.2 Compatible services and codecs . 57
7.2.19.3 Specification. 57
7.3 Audio transmission types applicable to Fixed Parts . 57
7.3.0 General . 57
7.3.1 FP Type 0: Reference FP (ReFP) . 58
7.3.2 FP Type 1a: "classical" Fixed Part for ISDN Network . 58
7.3.2.1 Introduction . 58
7.3.2.2 Compatible services and codecs . 59
7.3.2.3 Specifications . 59
7.3.2.3.1 Transcoding and equalization . 59
7.3.2.3.2 PP type detection . 59
7.3.2.3.3 Activation of audio processing functions . 59
7.3.2.3.4 Transmission specification . 60
7.3.3 FP Type 1b: Fixed Part for ISDN Network . 60
7.3.3.1 Introduction . 60
7.3.3.2 Compatible services and codecs . 60
7.3.3.3 Specification. 60
7.3.3.3.1 Transcoding and equalization . 60
7.3.3.3.2 PP type detection . 61
7.3.3.3.3 Activation of audio processing functions . 61
7.3.3.3.4 Transmission specification . 61
7.3.4 FP Type 2: FP with analog 2-wire interface, 3,1 kHz service . 61
7.3.4.1 Introduction . 61
7.3.4.2 Compatible services, physical interfaces and codecs . 62
7.3.4.3 Specification. 62
7.3.4.3.1 Transcoding, equalization and conversion . 62
7.3.4.3.2 PP type detection and activation of audio processing functions . 62
7.3.4.3.3 Transmission specification . 62
7.3.5 FP Type 3: VoIP narrowband Fixed Part . 62
7.3.5.1 Introduction . 62
7.3.5.2 Compatible services, physical interfaces and codecs . 63
7.3.5.3 Specification. 63
7.3.5.3.1 Transcoding and equalization . 63
ETSI
6 ETSI EN 300 175-8 V2.8.1 (2019-12)
7.3.5.3.2 PP type detection . 64
7.3.5.3.3 Activation of audio processing functions . 64
7.3.5.3.4 Transmission specification . 64
7.3.6 FP Type 4: ISDN wideband Fixed Part . 65
7.3.6.1 Introduction . 65
7.3.6.2 Compatible services and codecs . 65
7.3.6.3 Specification. 65
7.3.6.3.1 Transcoding and equalization . 65
7.3.6.3.2 PP type detection . 65
7.3.6.3.3 Activation of audio processing functions . 65
7.3.6.3.4 Transmission specification . 66
7.3.7 FP Type 5: VoIP wideband, super-wideband or fullband Fixed Part . 66
7.3.7.1 Introduction . 66
7.3.7.2 Compatible services, physical interfaces and codecs . 66
7.3.7.3 Specification. 67
7.3.7.3.1 Transcoding and equalization . 67
7.3.7.3.2 PP type detection . 67
7.3.7.3.3 Activation of audio processing functions . 67
7.3.7.3.4 Transmission specification . 68
7.3.8 FP Type 6a: FP handling an Internal call inside a DECT FP (any service) . 68
7.3.8.1 Introduction . 68
7.3.8.2 Compatible services, physical interfaces and codecs . 68
7.3.8.3 Specification. 68
7.3.9 FP Type 6b: FP handling an n-party conference inside a DECT FP (any service) . 68
7.3.9.1 Introduction . 68
7.3.9.2 Compatible services, physical interfaces and codecs . 68
7.3.9.3 Specification for the conference bridge. 69
7.3.10 FP Type 7: DECT Repeater Part (REP) . 69
7.3.10.1 Introduction . 69
7.3.10.2 Compatible services, physical interfaces and codecs . 69
7.3.10.3 Specification. 69
7.4 Additional features . 69
7.4.1 Introduction. 69
7.4.2 Echo canceller in Fixed Part . 70
7.4.3 Echo suppressor in Fixed Part. 70
7.5 Transmission characteristics for Portable Parts . 71
7.5.1 Transmission characteristics for Portable Part type 1a ("Classic GAP" handset) . 71
7.5.1.1 PP frequency responses . 71
7.5.1.1.1 Sending . 71
7.5.1.1.2 Receiving . 72
7.5.1.2 PP sending and receiving loudness ratings . 72
7.5.1.2.1 Nominal values . 72
7.5.1.2.2 User-controlled volume control in PP . 72
7.5.1.2.3 PP adaptive volume control . 73
7.5.1.3 Sidetone . 73
7.5.1.3.1 Talker sidetone . 73
7.5.1.3.2 Listener sidetone . 74
7.5.1.4 Terminal coupling loss . 74
7.5.1.4.1 Weighted Terminal Coupling Loss (TCLw) . 74
7.5.1.4.2 Stability loss . 74
7.5.1.5 Distortion . 75
7.5.1.5.1 Sending . 75
7.5.1.5.2 Receiving . 75
7.5.1.5.3 Sidetone . 75
7.5.1.6 Out of band signals. 75
7.5.1.6.1 Sending (discrimination against out of band input signals) . 75
7.5.1.6.2 Receiving (spurious out of band signals) . 76
7.5.1.7 Noise . 76
7.5.1.7.1 Sending . 76
7.5.1.7.2 Band-limited noise. 76
7.5.1.7.3 Receiving . 76
7.5.1.7.4 Level of sampling frequency (receiving) . 77
ETSI
7 ETSI EN 300 175-8 V2.8.1 (2019-12)
7.5.1.8 Acoustic shock . 77
7.5.1.8.0 General . 77
7.5.1.8.1 Continuous signal . 77
7.5.1.8.2 Peak signal . 77
7.5.1.9 PP Delay . 77
7.5.1.10 PP ambient noise rejection . 77
7.5.2 Additional requirements for PP type 1b ("improved GAP" handset) . 78
7.5.2.0 General . 78
7.5.2.1 Terminal coupling loss . 78
7.5.2.1.1 Weighted Terminal Coupling Loss (TCLw) . 78
7.5.2.2 Attenuation Range in Sending Direction during Double Talk A . 78
H,S,dt
7.5.2.3 Attenuation Range in Receiving Direction during Double Talk A . 78
H,R,dt
7.5.2.4 Activation in Sending Direction . 79
7.5.2.5 Activation in Receiving Direction . 79
7.5.3 Transmission characteristics for PP types 1c and 1d (HATS tested, narrowband telephony handsets) . 80
7.5.3.1 Frequency responses . 80
7.5.3.1.1 Sending . 80
7.5.3.1.2 Receiving . 81
7.5.3.2 Sending and receiving loudness ratings . 83
7.5.3.2.1 Nominal values . 83
7.5.3.2.2 Void . 83
7.5.3.2.3 Void . 83
7.5.3.2.4 Microphone mute. 83
7.5.3.2.5 Positional robustness . 84
7.5.3.3 Sidetone .
...
Frequently Asked Questions
ETSI EN 300 175-8 V2.8.1 (2019-12) is a standard published by the European Telecommunications Standards Institute (ETSI). Its full title is "Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 8: Speech and audio coding and transmission". This standard covers: REN/DECT-00328
REN/DECT-00328
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