ETSI GSM 06 12-1993 European Digital Cellular Telecommunication System (Phase 2) Comfort Noise Aspects for Full Rate Speech Traffic Channels (ETS 300 580-4 Version 4 0 4)《欧洲数字蜂窝通信系.pdf
《ETSI GSM 06 12-1993 European Digital Cellular Telecommunication System (Phase 2) Comfort Noise Aspects for Full Rate Speech Traffic Channels (ETS 300 580-4 Version 4 0 4)《欧洲数字蜂窝通信系.pdf》由会员分享,可在线阅读,更多相关《ETSI GSM 06 12-1993 European Digital Cellular Telecommunication System (Phase 2) Comfort Noise Aspects for Full Rate Speech Traffic Channels (ETS 300 580-4 Version 4 0 4)《欧洲数字蜂窝通信系.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Released: July 1, 1993 GSM 06.12 Version 4.0.1 Date: January 1993 Work Item No: Key words: European digital cellular telecommunication system (phase 2); Comfort Noise Aspects for Full Rate Speech Traffic Channels ETSI European Telecommunications Standards Institute ETSI Secretariat: F - 06921 Sophia
2、 Antipolis Cedex . France TP. + 33 92 94 42 00 TF. + 33 93 5 47 16 Tx. 47 00 40 F This is an unpublished work the copyright in which vests in the European Telecommunications Standards Institute. Ali rights reserved. The information contained herein is the propetry of ETSI and no part may be reproduc
3、ed or used except as authorised by contract or other written permission. The copyright and the foregoing restriction on reproduction and use extend to ail media in which the information may be embodied. Pig. 3 GSM 06.12 (4.0.1): January 1993 Contents O.SCOP . 5 1.GENERAL 5 2 . FUNCTIONS ON ME TRANSM
4、IT SIDE . 5 2.1, BACKGROUND ACOUSTIC NOISE EVALUATION . 6 2.2. SID-FRAME ENCOOlNa . 6 3 . FUNCTIONS ON ME RECEIVE SIDE 7 3.1. COMFORT NOiCE GENERATION AND UPDATING 7 Previous page is blank 3404583 0080481 703 Paga 5 GSM 06.12 (4.0.1): Janwty 1993 O. SCOPE This technical specification gives the detai
5、led requirements for the cotrect operation of th background acoustic noise evaluation, noise parameter eclcodinq/decoding and comfort noise generation in GSM Mobile Stat and Base Statim Systems during Discontinuous Transmissim (DTX) on full rate speech traffic chanmis. The requirements described in
6、this technicd specification are mandatory for implementation in ail GSM Mobile Statioris. The receiver requirements are mandatory for implementation in ail GSM Base Station Systems, the transmitter requirements oniy foc those where dcrwnlink DIX will be used. 1. GENERAL The definitions of terms usd
7、in this technical specification can be found in GSM 06.31. The overall operation of Discontinuous Transmission is described in GSM 06.31. A basic problem when using DIX is that the Wkgrwnd accustic noise, which is transmitted tcgethec with the speech, would disappear when the radio transmission is c
8、ut, resulting in a modulation of the backgrowid noise. Since the DTX switching can take piace rap*, it has been found that this effect can be very wing foc the listener - especially in a ca mirmerit with high background noise levels. In bad cases the speech may be har#y intelligible. This technical
9、specca!im specifies the way to overcome this problem by genetating on the receive side synthetic noise similar to the transmit side background noise. The parameters of this so called comfort noise BTB estimated on the transmit side and transmitted to the receive side Mote the radio transmission is C
10、IA and d a regular low rate afterwards. This allows 2. FUNCTIONS ON THE TRANSMIT SIDE th8 CwnfUt ndSe to adap tothe ChangeS af the On the banSm& Side. The comfort noise evakiabion aigorithm uses the unqumtized biock amplitude and Log Area Ratio (LAR) prvameiers give information m the leve( and the s
11、pectrum d the backgwnd noise, respecttvefy. wemeters d the hJI ra enCoder, wried in S&Ul 4.2.15 and 4.2.6 d GCM 06.10. Thece The evaluated comfort noise parameters are encoded into a special frame, called a Si0 (Silence Descripor) frame, fcr transmission to the receive side. The SiDfrms aQ0 saves to
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