1、 ETSI EN 300 175-8 V2.7.1 (2017-11) Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 8: Speech and audio coding and transmission EUROPEAN STANDARD ETSI ETSI EN 300 175-8 V2.7.1 (2017-11) 2 Reference REN/DECT-00307-8 Keywords 7 kHz, audio, broadband, codec, DECT, hands
2、free, 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 but non lucratif enregistre
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9、ation. ETSI ETSI EN 300 175-8 V2.7.1 (2017-11) 3 Contents Intellectual Property Rights 12g3Foreword . 12g3Modal verbs terminology 12g31 Scope 13g32 References 13g32.1 Normative references . 13g32.2 Informative references 15g33 Definitions, symbols and abbreviations . 16g33.1 Definitions 16g33.2 Symb
10、ols and abbreviations . 17g34 Configurations 19g34.1 Reference configuration . 19g34.1.1 Basic configuration . 19g34.1.2 Portable Part (PP) . 21g34.1.2.1 Functional organization . 21g34.1.2.2 Volume control . 21g34.1.3 Fixed Part (FP) 21g34.1.3.1 Digital interface . 21g34.1.3.2 Analog interface 23g3
11、4.1.3.3 FP adaptive volume control 23g34.2 Test configurations . 23g35 Encoding . 23g35.0 General . 23g35.1 32 kbit/s full term (ADPCM) G.726 . 24g35.1.1 Algorithm 24g35.1.2 Bit sequence 24g35.1.3 Characteristics of G.726 ADPCM codec 24g35.2 64 kbit/s PCM G.711 24g35.2.1 Algorithm 24g35.2.2 Bit sequ
12、ence 24g35.2.3 Characteristics of G.711 PCM codec 25g35.2.4 Automatic detection of FAX/modem tone and switch to G.711 . 25g35.3 Wideband speech codec G.722 at 64 kbit/s 25g35.3.0 General 25g35.3.1 Algorithm 25g35.3.2 Bit sequence 25g35.3.3 Characteristics of G.722 wideband codec . 25g35.3.4 Optional
13、 Packet Loss Concealment algorithm (PLC) . 26g35.4 Wideband speech codec G.729.1 up to 32 kbit/s 26g35.4.1 Algorithm 26g35.4.2 Bit sequence 26g35.4.3 Characteristics of G.729.1 codec 26g35.4.4 Packet Loss Concealment algorithm (PLC) 27g35.4.5 Supported bit rate in DECT 27g35.5 Super-wideband MPEG-4
14、speech and audio coding 27g35.5.1 Algorithm 27g35.5.2 64 kbit/s, MPEG-4 ER AAC-LD codec 28g35.5.3 32 kbit/s, MPEG-4 ER AAC-LD codec 28g35.6 Other codings . 28g36 Transmission aspects 29g36.1 Relative level 29g36.2 Acoustic reference level . 29g36.3 Volume control . 29g3ETSI ETSI EN 300 175-8 V2.7.1
15、(2017-11) 4 7 Audio specifications . 29g37.1 Overall description . 29g37.1.1 Introduction to DECT audio specifications 29g37.1.2 Introduction to the audio types . 29g37.1.3 List of Audio types . 30g37.1.4 Audio types for Portable Parts 31g37.1.5 Audio types for Fixed Parts 32g37.1.6 Complete DECT sy
16、stem . 32g37.1.7 Structure of the specification of the audio types . 32g37.1.8 Audio Types and codecs . 38g37.1.9 Audio Types and physical interfaces 38g37.2 Audio types applicable to Portable Parts 38g37.2.0 General 38g37.2.1 Performance levels of DECT Portable Parts (handsets) 38g37.2.2 Type 0: Re
17、ference PP (RePP) . 39g37.2.3 PP Type 1a: “Classic“ GAP narrowband handset . 40g37.2.3.1 Introduction . 40g37.2.3.2 Compatible services and codecs 40g37.2.3.3 Specification 40g37.2.4 PP Type 1b: “Improved“ GAP narrowband handset . 40g37.2.4.1 Introduction . 40g37.2.4.2 Compatible services and codecs
18、 40g37.2.4.3 Specification 40g37.2.5 PP Type 1c: HATS-tested “standard“ narrowband handset 41g37.2.5.1 Introduction . 41g37.2.5.2 Compatible services and codecs 41g37.2.5.3 Specification 41g37.2.6 PP Type 1d: HATS-tested “improved“ narrowband handset 41g37.2.6.1 Introduction . 41g37.2.6.2 Compatible
19、 services and codecs 41g37.2.6.3 Specification 41g37.2.7 PP Type 3a: HATS tested narrowband “standard“ loudspeaking handsfree . 42g37.2.7.1 Introduction . 42g37.2.7.2 Compatible services and codecs 42g37.2.7.3 Specification 42g37.2.8 PP Type 3b: HATS tested narrowband “improved“ loudspeaking handsfr
20、ee . 42g37.2.8.1 Introduction . 42g37.2.8.2 Compatible services and codecs 42g37.2.8.3 Specification 42g37.2.9 PP Type 2a: P.311-tested wideband handset. 43g37.2.9.1 Introduction . 43g37.2.9.2 Compatible services and codecs 43g37.2.9.3 Specification 43g37.2.10 PP Type 2b: HATS-tested “standard“ wide
21、band handset or headset 43g37.2.10.1 Introduction . 43g37.2.10.2 Compatible services and codecs 43g37.2.10.3 Specification 43g37.2.11 PP Type 2c: HATS tested “improved“ wideband handset or headset . 44g37.2.11.1 Introduction . 44g37.2.11.2 Compatible services and codecs 44g37.2.11.3 Specification 44
22、g37.2.12 PP Type 4a: HATS tested wideband “standard“ loudspeaking handsfree 44g37.2.12.1 Introduction . 44g37.2.12.2 Compatible services and codecs 44g37.2.12.3 Specification 44g37.2.13 PP Type 4b: HATS tested wideband “improved“ loudspeaking and handsfree 45g37.2.13.1 Introduction . 45g37.2.13.2 Co
23、mpatible services and codecs 45g37.2.13.3 Specification 45g37.2.14 PP Type 5a: super-wideband 14 kHz handset . 45g37.2.14.1 Introduction . 45g37.2.14.2 Compatible services and codecs 45g3ETSI ETSI EN 300 175-8 V2.7.1 (2017-11) 5 7.2.14.3 Specification 45g37.2.15 PP Type 5b: super-wideband 14 kHz lou
24、dspeaking handsfree . 45g37.2.15.1 Introduction . 45g37.2.15.2 Compatible services and codecs 45g37.2.15.3 Specification 45g37.2.16 PP Type 6: PPs with external 2 wire, 3,1 kHz telephony interface . 46g37.2.16.1 Introduction . 46g37.2.16.2 Compatible services and codecs 46g37.2.16.3 Specification 46
25、g37.3 Audio transmission types applicable to Fixed Parts . 46g37.3.0 General 46g37.3.1 FP Type 0: Reference FP (ReFP) 46g37.3.2 FP Type 1a: “classical“ Fixed Part for ISDN Network . 47g37.3.2.1 Introduction . 47g37.3.2.2 Compatible services and codecs 47g37.3.2.3 Specifications 47g37.3.2.3.1 Transco
26、ding and equalization 47g37.3.2.3.2 PP type detection . 48g37.3.2.3.3 Activation of audio processing functions 48g37.3.2.3.4 Transmission specification 48g37.3.3 FP Type 1b: “new“ Fixed Part for ISDN Network . 48g37.3.3.1 Introduction . 48g37.3.3.2 Compatible services and codecs 49g37.3.3.3 Specific
27、ation 49g37.3.3.3.1 Transcoding and equalization 49g37.3.3.3.2 PP type detection . 49g37.3.3.3.3 Activation of audio processing functions 49g37.3.3.3.4 Transmission specification 50g37.3.4 FP Type 2: FP with analog 2-wire interface, 3,1 kHz service 50g37.3.4.1 Introduction . 50g37.3.4.2 Compatible s
28、ervices, physical interfaces and codecs 50g37.3.4.3 Specification 50g37.3.4.3.1 Transcoding, equalization and conversion 50g37.3.4.3.2 PP type detection and activation of audio processing functions 51g37.3.4.3.3 Transmission specification 51g37.3.5 FP Type 3: VoIP narrowband Fixed Part 51g37.3.5.1 I
29、ntroduction . 51g37.3.5.2 Compatible services, physical interfaces and codecs 51g37.3.5.3 Specification 52g37.3.5.3.1 Transcoding and equalization 52g37.3.5.3.2 PP type detection . 52g37.3.5.3.3 Activation of audio processing functions 52g37.3.5.3.4 Transmission specification 53g37.3.6 FP Type 4: IS
30、DN wideband Fixed Part 53g37.3.6.1 Introduction . 53g37.3.6.2 Compatible services and codecs 53g37.3.6.3 Specification 54g37.3.6.3.1 Transcoding and equalization 54g37.3.6.3.2 PP type detection . 54g37.3.6.3.3 Activation of audio processing functions 54g37.3.6.3.4 Transmission specification 54g37.3.
31、7 FP Type 5: VoIP wideband Fixed Part . 55g37.3.7.1 Introduction . 55g37.3.7.2 Compatible services, physical interfaces and codecs 55g37.3.7.3 Specification 55g37.3.7.3.1 Transcoding and equalization 55g37.3.7.3.2 PP type detection . 55g37.3.7.3.3 Activation of audio processing functions 56g37.3.7.3
32、.4 Transmission specification 56g37.3.8 FP Type 6a: FP handling an Internal call inside a DECT FP (any service) 56g37.3.8.1 Introduction . 56g37.3.8.2 Compatible services, physical interfaces and codecs 56g3ETSI ETSI EN 300 175-8 V2.7.1 (2017-11) 6 7.3.8.3 Specification 57g37.3.9 FP Type 6b: FP hand
33、ling an n-party conference inside a DECT FP (any service) . 57g37.3.9.1 Introduction . 57g37.3.9.2 Compatible services, physical interfaces and codecs 57g37.3.9.3 Specification for the conference bridge. 57g37.3.10 FP Type 7: DECT Repeater part (REP) 57g37.3.10.1 Introduction . 57g37.3.10.2 Compatib
34、le services, physical interfaces and codecs 57g37.3.10.3 Specification 57g37.4 Additional features . 58g37.4.1 Introduction. 58g37.4.2 Echo canceller in Fixed Part . 58g37.4.3 Echo suppressor in Fixed Part. 59g37.5 Transmission characteristics for Portable Parts 59g37.5.1 Transmission characteristic
35、s for Portable Part type 1a (“Classic GAP“ handset) . 59g37.5.1.1 PP frequency responses . 59g37.5.1.1.1 Sending 59g37.5.1.1.2 Receiving . 60g37.5.1.2 PP sending and receiving loudness ratings 60g37.5.1.2.1 Nominal values 60g37.5.1.2.2 User-controlled volume control in PP . 60g37.5.1.2.3 PP adaptive
36、 volume control . 61g37.5.1.3 Sidetone . 61g37.5.1.3.1 Talker sidetone 61g37.5.1.3.2 Listener sidetone 61g37.5.1.4 Terminal coupling loss 62g37.5.1.4.1 Weighted Terminal Coupling Loss (TCLw) 62g37.5.1.4.2 Stability loss 62g37.5.1.5 Distortion 62g37.5.1.5.1 Sending 62g37.5.1.5.2 Receiving . 63g37.5.1
37、.5.3 Sidetone . 63g37.5.1.6 Out of band signals 63g37.5.1.6.1 Sending (discrimination against out of band input signals) . 63g37.5.1.6.2 Receiving (spurious out of band signals) . 63g37.5.1.7 Noise . 63g37.5.1.7.1 Sending 63g37.5.1.7.2 Band-limited noise. 63g37.5.1.7.3 Receiving . 63g37.5.1.7.4 Leve
38、l of sampling frequency (receiving) . 64g37.5.1.8 Acoustic shock 64g37.5.1.8.0 General 64g37.5.1.8.1 Continuous signal 64g37.5.1.8.2 Peak signal . 64g37.5.1.9 PP Delay 64g37.5.1.10 PP ambient noise rejection 64g37.5.2 Additional requirements for PP type 1b (“improved GAP“ handset) . 64g37.5.2.0 Gene
39、ral 64g37.5.2.1 Terminal coupling loss 64g37.5.2.1.1 Weighted Terminal Coupling Loss (TCLw) 64g37.5.2.2 Attenuation Range in Sending Direction during Double Talk AH,S,dt65g37.5.2.3 Attenuation Range in Receiving Direction during Double Talk AH,R,dt65g37.5.2.4 Activation in Sending Direction 65g37.5.
40、2.5 Activation in Receiving Direction . 66g37.5.3 Transmission characteristics for PP types 1c and 1d (HATS tested, narrowband telephony handsets) 66g37.5.3.1 PP frequency responses . 66g37.5.3.1.1 Sending 66g37.5.3.1.2 Receiving . 67g37.5.3.2 PP sending and receiving loudness ratings 69g37.5.3.2.1
41、Nominal values 69g37.5.3.2.2 User-controlled volume control in PP . 70g37.5.3.2.3 PP adaptive volume control . 70g3ETSI ETSI EN 300 175-8 V2.7.1 (2017-11) 7 7.5.3.3 Sidetone . 71g37.5.3.3.1 Talker sidetone 71g37.5.3.3.2 D Factor . 71g37.5.3.3.3 Sidetone delay . 71g37.5.3.4 Terminal coupling loss 71g
42、37.5.3.4.1 TCLw of Portable Part . 71g37.5.3.4.2 Stability loss 72g37.5.3.5 Distortion 72g37.5.3.5.1 Sending Distortion . 72g37.5.3.5.2 Receiving Distortion 72g37.5.3.6 Out of band signals 72g37.5.3.6.1 Out-of-band Signals in Send direction 72g37.5.3.6.2 Out-of-band signals in receiving direction 73
43、g37.5.3.7 Noise . 73g37.5.3.7.1 Sending 73g37.5.3.7.2 Receiving . 73g37.5.3.8 Acoustic shock 74g37.5.3.8.0 General 74g37.5.3.8.1 Continuous signal 74g37.5.3.8.2 Peak signal . 74g37.5.3.9 Delay. 74g37.5.3.10 Variation of gain with input level-sending 74g37.5.3.11 Double Talk Performance . 75g37.5.3.1
44、1.0 General 75g37.5.3.11.1 Attenuation Range in Sending Direction during Double Talk AH,S,dt75g37.5.3.11.2 Attenuation Range in Receiving Direction during Double Talk AH,S,dt. 75g37.5.3.11.3 Detection of Echo Components during Double Talk . 76g37.5.3.11.4 Minimum activation level and sensitivity of
45、double talk detection . 76g37.5.3.12 Switching characteristics . 76g37.5.3.12.0 General 76g37.5.3.12.1 Activation in Sending Direction 76g37.5.3.12.2 Activation in Receiving Direction . 77g37.5.3.12.3 Silence Suppression and Comfort Noise Generation . 77g37.5.3.12.4 Performance in sending direction
46、in the presence of background noise 77g37.5.3.12.5 Speech Quality in the Presence of Background Noise. 77g37.5.3.12.6 Quality of Background Noise Transmission (with Far End Speech) . 78g37.5.3.12.7 Quality of background noise transmission (with Near End Speech) . 78g37.5.3.13 Quality of echo cancell
47、ation 78g37.5.3.13.0 General 78g37.5.3.13.1 Temporal echo effects . 78g37.5.3.13.2 Spectral Echo Attenuation . 78g37.5.4 Transmission characteristics for PP types 3a and 3b (narrowband loudspeaking and handsfree devices) . 79g37.5.4.1 Sending sensitivity/frequency response 79g37.5.4.2 Receive sensit
48、ivity/frequency response. 79g37.5.4.3 Sending loudness rating 82g37.5.4.4 Receive loudness rating . 82g37.5.4.5 Sending distortion . 83g37.5.4.6 Receiving distortion 83g37.5.4.7 Out-of-band signals in sending direction 83g37.5.4.8 Out-of-band signals in receiving direction 84g37.5.4.9 Sending noise
49、84g37.5.4.10 Receiving noise . 84g37.5.4.11 Terminal Coupling Loss of PP 85g37.5.4.12 Stability Loss of PP . 85g37.5.4.13 Double Talk Performance . 85g37.5.4.13.0 General 85g37.5.4.13.1 Attenuation Range in Sending Direction during Double Talk AH,S,dt85g37.5.4.13.2 Attenuation Range in Receiving Direction during Double Talk AH,R,dt. 86g37.5.4.13.3 Detection of Echo Components during Double Talk . 86g37.5.4.13.4 Minimum activation level and sensitivity of double talk detection . 87g37.5.4.14 Switching characteristics . 87g3ETSI ETSI EN 300 175-8 V2.7.1 (2017-11) 8 7.5.4.14.0 Gen
