1、 ETSI EN 300 175-8 V2.6.1 (2015-07) Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 8: Speech and audio coding and transmission EUROPEAN STANDARD ETSI ETSI EN 300 175-8 V2.6.1 (2015-07) 2 Reference REN/DECT-000304-8 Keywords 7 kHz, audio, broadband, codec, DECT, hand
2、sfree, 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、300 175-8 V2.6.1 (2015-07) 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 Symbols and abbreviation
10、s . 17g34 Configurations 19g34.1 Reference configuration . 19g34.1.1 Basic configuration . 19g34.1.2 Portable Part (PP) . 20g34.1.2.1 Functional organization . 20g34.1.2.2 Volume control . 21g34.1.3 Fixed Part (FP) 21g34.1.3.1 Digital interface . 21g34.1.3.2 Analog interface 22g34.1.3.3 FP adaptive
11、volume control 23g34.2 Test configurations . 23g35 Encoding . 23g35.1 32 kbit/s full term (ADPCM) G.726 . 23g35.1.1 Algorithm 23g35.1.2 Bit sequence 23g35.1.3 Characteristics of G.726 ADPCM codec 23g35.2 64 kbit/s PCM G.711 24g35.2.1 Algorithm 24g35.2.2 Bit sequence 24g35.2.3 Characteristics of G.71
12、1 PCM codec 24g35.2.4 Automatic detection of FAX/modem tone and switch to G.711 . 24g35.3 Wideband speech codec G.722 at 64 kbit/s 24g35.3.0 General 24g35.3.1 Algorithm 24g35.3.2 Bit sequence 25g35.3.3 Characteristics of G.722 wideband codec . 25g35.3.4 Optional Packet Loss Concealment algorithm (PL
13、C) . 25g35.4 Wideband speech codec G.729.1 up to 32 kbit/s 25g35.4.1 Algorithm 25g35.4.2 Bit sequence 26g35.4.3 Characteristics of G.729.1 codec 26g35.4.4 Packet Loss Concealment algorithm (PLC) 26g35.4.5 Supported bit rate in DECT 26g35.5 Super-wideband MPEG-4 speech and audio coding 26g35.5.1 Algo
14、rithm 26g35.5.2 64 kbit/s, MPEG-4 ER AAC-LD codec 27g35.5.3 32 kbit/s, MPEG-4 ER AAC-LD codec 27g35.6 Other codings . 27g36 Transmission aspects 28g36.1 Relative level 28g36.2 Acoustic reference level . 28g36.3 Volume control . 28g37 Audio specifications . 28g3ETSI ETSI EN 300 175-8 V2.6.1 (2015-07)
15、 4 7.1 Overall description . 28g37.1.1 Introduction to DECT audio specifications 28g37.1.2 Introduction to the audio types . 28g37.1.3 List of Audio types . 29g37.1.4 Audio types for Portable Parts 30g37.1.5 Audio types for Fixed Parts 31g37.1.6 Complete DECT system . 31g37.1.7 Structure of the spec
16、ification of the audio types . 31g37.1.8 Audio Types and codecs . 37g37.1.9 Audio Types and physical interfaces 37g37.2 Audio types applicable to Portable Parts 37g37.2.0 General 37g37.2.1 Performance levels of DECT Portable Parts (handsets) 37g37.2.2 Type 0: Reference PP (RePP) . 38g37.2.3 PP Type
17、1a: “Classic“ GAP narrowband handset . 38g37.2.3.1 Introduction . 38g37.2.3.2 Compatible services and codecs 39g37.2.3.3 Specification 39g37.2.4 PP Type 1b: “Improved“ GAP narrowband handset . 39g37.2.4.1 Introduction . 39g37.2.4.2 Compatible services and codecs 39g37.2.4.3 Specification 39g37.2.5 P
18、P Type 1c: HATS-tested “standard“ narrowband handset 39g37.2.5.1 Introduction . 39g37.2.5.2 Compatible services and codecs 39g37.2.5.3 Specification 40g37.2.6 PP Type 1d: HATS-tested “improved“ narrowband handset 40g37.2.6.1 Introduction . 40g37.2.6.2 Compatible services and codecs 40g37.2.6.3 Speci
19、fication 40g37.2.7 PP Type 3a: HATS tested narrowband “standard“ loudspeaking handsfree . 40g37.2.7.1 Introduction . 40g37.2.7.2 Compatible services and codecs 41g37.2.7.3 Specification 41g37.2.8 PP Type 3b: HATS tested narrowband “improved“ loudspeaking handsfree . 41g37.2.8.1 Introduction . 41g37.
20、2.8.2 Compatible services and codecs 41g37.2.8.3 Specification 41g37.2.9 PP Type 2a: P.311-tested wideband handset. 41g37.2.9.1 Introduction . 41g37.2.9.2 Compatible services and codecs 41g37.2.9.3 Specification 41g37.2.10 PP Type 2b: HATS-tested “standard“ wideband handset or headset 42g37.2.10.1 I
21、ntroduction . 42g37.2.10.2 Compatible services and codecs 42g37.2.10.3 Specification 42g37.2.11 PP Type 2c: HATS tested “improved“ wideband handset or headset . 42g37.2.11.1 Introduction . 42g37.2.11.2 Compatible services and codecs 42g37.2.11.3 Specification 42g37.2.12 PP Type 4a: HATS tested wideb
22、and “standard“ loudspeaking handsfree 43g37.2.12.1 Introduction . 43g37.2.12.2 Compatible services and codecs 43g37.2.12.3 Specification 43g37.2.13 PP Type 4b: HATS tested wideband “improved“ loudspeaking and handsfree 43g37.2.13.1 Introduction . 43g37.2.13.2 Compatible services and codecs 43g37.2.1
23、3.3 Specification 43g37.2.14 PP Type 5a: super-wideband 14 kHz handset . 44g37.2.14.1 Introduction . 44g37.2.14.2 Compatible services and codecs 44g37.2.14.3 Specification 44g3ETSI ETSI EN 300 175-8 V2.6.1 (2015-07) 5 7.2.15 PP Type 5b: super-wideband 14 kHz loudspeaking handsfree . 44g37.2.15.1 Int
24、roduction . 44g37.2.15.2 Compatible services and codecs 44g37.2.15.3 Specification 44g37.2.16 PP Type 6: PPs with external 2 wire, 3,1 kHz telephony interface . 44g37.2.16.1 Introduction . 44g37.2.16.2 Compatible services and codecs 44g37.2.16.3 Specification 44g37.3 Audio transmission types applica
25、ble to Fixed Parts . 44g37.3.0 General 44g37.3.1 FP Type 0: Reference FP (ReFP) 45g37.3.2 FP Type 1a: “classical“ Fixed Part for ISDN Network . 45g37.3.2.1 Introduction . 45g37.3.2.2 Compatible services and codecs 46g37.3.2.3 Specifications 46g37.3.2.3.1 Transcoding and equalization 46g37.3.2.3.2 PP
26、 type detection . 46g37.3.2.3.3 Activation of audio processing functions 46g37.3.2.3.4 Transmission specification 46g37.3.3 FP Type 1b: “new“ Fixed Part for ISDN Network . 47g37.3.3.1 Introduction . 47g37.3.3.2 Compatible services and codecs 47g37.3.3.3 Specification 47g37.3.3.3.1 Transcoding and eq
27、ualization 47g37.3.3.3.2 PP type detection . 47g37.3.3.3.3 Activation of audio processing functions 48g37.3.3.3.4 Transmission specification 48g37.3.4 FP Type 2: FP with analog 2-wire interface, 3,1 kHz service 48g37.3.4.1 Introduction . 48g37.3.4.2 Compatible services, physical interfaces and codec
28、s 48g37.3.4.3 Specification 49g37.3.4.3.1 Transcoding, equalization and conversion 49g37.3.4.3.2 PP type detection and activation of audio processing functions 49g37.3.4.3.3 Transmission specification 49g37.3.5 FP Type 3: VoIP narrowband Fixed Part 49g37.3.5.1 Introduction . 49g37.3.5.2 Compatible s
29、ervices, physical interfaces and codecs 49g37.3.5.3 Specification 50g37.3.5.3.1 Transcoding and equalization 50g37.3.5.3.2 PP type detection . 50g37.3.5.3.3 Activation of audio processing functions 50g37.3.5.3.4 Transmission specification 51g37.3.6 FP Type 4: ISDN wideband Fixed Part 51g37.3.6.1 Int
30、roduction . 51g37.3.6.2 Compatible services and codecs 51g37.3.6.3 Specification 51g37.3.6.3.1 Transcoding and equalization 51g37.3.6.3.2 PP type detection . 52g37.3.6.3.3 Activation of audio processing functions 52g37.3.6.3.4 Transmission specification 52g37.3.7 FP Type 5: VoIP wideband Fixed Part
31、. 52g37.3.7.1 Introduction . 52g37.3.7.2 Compatible services, physical interfaces and codecs 53g37.3.7.3 Specification 53g37.3.7.3.1 Transcoding and equalization 53g37.3.7.3.2 PP type detection . 53g37.3.7.3.3 Activation of audio processing functions 54g37.3.7.3.4 Transmission specification 54g37.3.
32、8 FP Type 6a: FP handling an Internal call inside a DECT FP (any service) 54g37.3.8.1 Introduction . 54g37.3.8.2 Compatible services, physical interfaces and codecs 54g37.3.8.3 Specification 54g3ETSI ETSI EN 300 175-8 V2.6.1 (2015-07) 6 7.3.9 FP Type 6b: FP handling an n-party conference inside a DE
33、CT FP (any service) . 54g37.3.9.1 Introduction . 54g37.3.9.2 Compatible services, physical interfaces and codecs 55g37.3.9.3 Specification for the conference bridge. 55g37.3.10 FP Type 7: DECT Repeater part (REP) 55g37.3.10.1 Introduction . 55g37.3.10.2 Compatible services, physical interfaces and c
34、odecs 55g37.3.10.3 Specification 55g37.4 Additional features . 55g37.4.1 Introduction. 55g37.4.2 Echo canceller in Fixed Part . 56g37.4.3 Echo suppressor in Fixed Part. 56g37.5 Transmission characteristics for Portable Parts 57g37.5.1 Transmission characteristics for Portable Part type 1a (“Classic
35、GAP“ handset) . 57g37.5.1.1 PP frequency responses . 57g37.5.1.1.1 Sending 57g37.5.1.1.2 Receiving . 57g37.5.1.2 PP sending and receiving loudness ratings 58g37.5.1.2.1 Nominal values 58g37.5.1.2.2 User-controlled volume control in PP . 58g37.5.1.2.3 PP adaptive volume control . 59g37.5.1.3 Sidetone
36、 . 59g37.5.1.3.1 Talker sidetone 59g37.5.1.3.2 Listener sidetone 59g37.5.1.4 Terminal coupling loss 59g37.5.1.4.1 Weighted Terminal Coupling Loss (TCLw) 59g37.5.1.4.2 Stability loss 60g37.5.1.5 Distortion 60g37.5.1.5.1 Sending 60g37.5.1.5.2 Receiving . 60g37.5.1.5.3 Sidetone . 60g37.5.1.6 Out of ban
37、d signals 60g37.5.1.6.1 Sending (discrimination against out of band input signals) . 60g37.5.1.6.2 Receiving (spurious out of band signals) . 61g37.5.1.7 Noise . 61g37.5.1.7.1 Sending 61g37.5.1.7.2 Band-limited noise. 61g37.5.1.7.3 Receiving . 61g37.5.1.7.4 Level of sampling frequency (receiving) .
38、61g37.5.1.8 Acoustic shock 61g37.5.1.8.0 General 61g37.5.1.8.1 Continuous signal 61g37.5.1.8.2 Peak signal . 61g37.5.1.9 PP Delay 61g37.5.1.10 PP ambient noise rejection 61g37.5.2 Additional requirements for PP type 1b (“improved GAP“ handset) . 62g37.5.2.1 Terminal coupling loss 62g37.5.2.1.1 Weigh
39、ted Terminal Coupling Loss (TCLw) 62g37.5.2.2 Attenuation Range in Sending Direction during Double Talk AH,S,dt62g37.5.2.3 Attenuation Range in Receiving Direction during Double Talk AH,R,dt62g37.5.2.4 Activation in Sending Direction 63g37.5.2.5 Activation in Receiving Direction . 63g37.5.3 Transmis
40、sion characteristics for PP types 1c and 1d (HATS tested, narrowband telephony handsets) 64g37.5.3.1 PP frequency responses . 64g37.5.3.1.1 Sending 64g37.5.3.1.2 Receiving . 65g37.5.3.2 PP sending and receiving loudness ratings 67g37.5.3.2.1 Nominal values 67g37.5.3.2.2 User-controlled volume contro
41、l in PP . 67g37.5.3.2.3 PP adaptive volume control . 68g37.5.3.3 Sidetone . 68g37.5.3.3.1 Talker sidetone 68g3ETSI ETSI EN 300 175-8 V2.6.1 (2015-07) 7 7.5.3.3.2 D Factor . 68g37.5.3.3.3 Sidetone delay . 68g37.5.3.4 Terminal coupling loss 69g37.5.3.4.1 TCLw of Portable Part . 69g37.5.3.4.2 Stability
42、 loss 69g37.5.3.5 Distortion 69g37.5.3.5.1 Sending Distortion . 69g37.5.3.5.2 Receiving Distortion 69g37.5.3.6 Out of band signals 70g37.5.3.6.1 Out-of-band Signals in Send direction 70g37.5.3.6.2 Out-of-band signals in receiving direction 70g37.5.3.7 Noise . 70g37.5.3.7.1 Sending 70g37.5.3.7.2 Rece
43、iving . 71g37.5.3.8 Acoustic shock 71g37.5.3.8.0 General 71g37.5.3.8.1 Continuous signal 71g37.5.3.8.2 Peak signal . 71g37.5.3.9 Delay. 71g37.5.3.10 Variation of gain with input level-sending 71g37.5.3.11 Double Talk Performance . 72g37.5.3.11.0 General 72g37.5.3.11.1 Attenuation Range in Sending Di
44、rection during Double Talk AH,S,dt72g37.5.3.11.2 Attenuation Range in Receiving Direction during Double Talk AH,S,dt. 73g37.5.3.11.3 Detection of Echo Components during Double Talk . 73g37.5.3.11.4 Minimum activation level and sensitivity of double talk detection . 73g37.5.3.12 Switching characteris
45、tics . 73g37.5.3.12.0 General 73g37.5.3.12.1 Activation in Sending Direction 74g37.5.3.12.2 Activation in Receiving Direction . 74g37.5.3.12.3 Silence Suppression and Comfort Noise Generation . 74g37.5.3.12.4 Performance in sending direction in the presence of background noise 74g37.5.3.12.5 Speech
46、Quality in the Presence of Background Noise. 75g37.5.3.12.6 Quality of Background Noise Transmission (with Far End Speech) . 75g37.5.3.12.7 Quality of background noise transmission (with Near End Speech) . 75g37.5.3.13 Quality of echo cancellation 75g37.5.3.13.0 General 75g37.5.3.13.1 Temporal echo
47、effects . 75g37.5.3.13.2 Spectral Echo Attenuation . 75g37.5.4 Transmission characteristics for PP types 3a and 3b (narrowband loudspeaking and handsfree devices) . 76g37.5.4.1 Sending sensitivity/frequency response 76g37.5.4.2 Receive sensitivity/frequency response. 77g37.5.4.3 Sending loudness rat
48、ing 80g37.5.4.4 Receive loudness rating . 80g37.5.4.5 Sending distortion . 81g37.5.4.6 Receiving distortion 81g37.5.4.7 Out-of-band signals in sending direction 81g37.5.4.8 Out-of-band signals in receiving direction 82g37.5.4.9 Sending noise 82g37.5.4.10 Receiving noise . 82g37.5.4.11 Terminal Coupl
49、ing Loss of PP 82g37.5.4.12 Stability Loss of PP . 83g37.5.4.13 Double Talk Performance . 83g37.5.4.13.0 General 83g37.5.4.13.1 Attenuation Range in Sending Direction during Double Talk AH,S,dt83g37.5.4.13.2 Attenuation Range in Receiving Direction during Double Talk AH,R,dt. 84g37.5.4.13.3 Detection of Echo Components during Double Talk . 84g37.5.4.13.4 Minimum activation level and sensitivity of double talk detection . 84g37.5.4.14 Switching characteristics . 84g37.5.4.14.0 General 84g37.5.4.14.1 Activation in Sending Direction 85g3ETSI ETSI EN 300 175-8 V2.6.1 (2015-07) 8 7.
