TIA-IS-J-STD-782-SERIES-06.032-2001.pdf
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1、JOINT INTERIM STANDARD GMR-1 Series 06 (06.032) Speech Coding Specifications - Vocoder - Voice Activity Detection (VAD) IS-J-STD-782-Series 6 NOVEMBER 2001 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Rcprewnting the telennimunicationv indusiry in aysocaion with the Electronic Indusiria Alliance Elsctron
2、 ic Ind wtries. Allia nee EUROPEAN TELECOMMUNICATIONS STANDARDS INSTITUTE Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 01:22:54 MDTNo reproduction or networking permitted withou
3、t license from IHS -,-,- NOTICE FROM THE TELECOMMUNICATIONS INDUSTRY ASSOCIATION TIA/EIA Engineering Standards and hblications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of prod
4、ucts, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards and hblications shall not in any respect preclude any member or nonmember of TIA/EIA from manufacturing or selling products not conforming to such S
5、tandards and hblications, nor shall the existence of such Standards and hblications preclude their voluntary use by those other than TIA/EIA members, whether the standard is to be used either domestically or internationally. Standards and hblications are adopted by TIA/EIA in accordance with the Ame
6、rican National Standards Institute (ANSI) patent policy. By such action, TIA/EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard or hblication. Note: The user?s attention is called to the possibiliS, that compliance with
7、this document may require use o f one or more inventions covered by patent rights. By publication o f this standard, Interim Standard, or TSB, no position is taken with respect to the validio o f those claims or o f any patent rights in connection therewith. The patent holder) so far identified have
8、, however, filed statements o f willingness to grant licenses under those rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such licenses. Details may be obtained from the standards developer. TIA/EIA AND JOINT INTERIM STANDARDS Joint Interim Standards
9、contain information deemed to be of technical value to the industry, and are published at the request of the originating Committee without necessarily following the rigorous public review and resolution of comments which is a procedural part of the development of an American National Standard (ANS).
10、 Interim Standards should be reviewed on a periodic basis by the formulating Committee and a decision made on whether to proceed to develop a TIA/EIA Standard on this subject. Interim Standards must be upgraded or cancelled by the Committee before the end of their third year of existence. hblication
11、 of this Joint Interim Standard for trial use and comment has been approved by the Telecommunications Industry Association. Distribution of this Joint Interim Standard for comment shall not continue beyond 36 months from the date of publication. It is expected that following this 36 month period, th
12、is Joint Interim Standard, revised as necessary, will be submitted to the American National Standards Institute for approval as an American National Standard. Suggestions for revision should be directed to: Standards Abbreviations and acronyms“. GMR-1 06.0 12 (TIA/EIA/IS-782.060 12) “GEO-Mobile Radi
13、o Interface Specifications; Comfort Noise Aspects“. 21 Note: 31 This specification is not yet published. GMR-1 06.03 1 (TIA/EIA/IS-782.0603 1) “GEO-Mobile Radio Interface Specifications; Discontinuous Transmission (DTX)“. Note: 41 This specification is not yet published. GMR-1 05.008 (TIA/EIA/IS-782
14、.05008) “GEO-Mobile Radio Interface Specifications; Radio Subsystem Link Control“. This specification is not yet published. Note: 51 GMR-1 06.001 (TIA/EIA/IS-782.0600 1) “GEO-Mobile Radio Interface Specifications; Speech Processing Functions“. This specification is not yet published. Note: 61 GMR-1
15、01.201 (TIA/EIA/IS-782.01201) “GEO-Mobile Radio Interface Specifications; Introduction to the GMR-1 family“. Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 01:22:54 MDTNo reproduc
16、tion or networking permitted without license from IHS -,-,- TINEINIS-782.06032 3 Definitions and abbreviations 3.1 De fi ni tions Voice Activity Detection FAD): A method of classifiing short segments of speech as either “voice“ or “background noise.“ The decision is based upon comparing the current
17、level and spectral characteristics of the input signal with that of a typical level and spectral characteristics. Comfort Noise Insertion (CNI): A method of synthesizing low-level noise on the receive side during breaks in voice transmission. To increase the perceived voice quality, the synthesized
18、noise has characteristics that are similar to the background noise present on the transmit side. Forward Error Correction (FEC): A method of introducing redundancy to binary data that allows for the detection andor correction of errors introduced during transmission of that data. VKJVFoicedRJnvoiced
19、): Each spectral band is declared either “voiced“ or “unvoiced“, depending upon the amount of periodic energy in that band. This voicing decision is frequently referred to as a V/UV decision. frame: The data representing a full 40 mec of continuous data input to or output from the vocoder. The frame
20、 data may consist of model parameters, quantized bits, FEC encoded channel data, or speech samples at various points in the vocoder. subframe: The data representing 10 msec of continuous data input to or output from the vocoder, or the result of processing that data through various points in the voc
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- TIA IS STD 782 SERIES 06.032 2001
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