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자료 검색결과

표준종류

정보통신단체표준(TTAS)

표준번호

TTAT.3G-26.204(R7-7.1.0)

구 표준번호

제개정일

2008-04-09

총 페이지

한글 표준명

IMT-2000 3GPP - 부동 소수점 AMR 광대역 음성 코덱의 ANSI-C 소스코드(R7)

영문 표준명

IMT-2000 3GPP-ANSI-C code for the floating-point Adaptive Multi-Rate (AMR) wideband speech codec(R7)

한글 내용요약

영문 내용요약

The present document contains an electronic copy of the ANSI C code for the Floating-point Adaptive Multi-Rate Wideband codec. This floating-point codec specification is mainly targeted to be used in multimedia applications or in packet-based applications. The bit-exact fixed-point ANSI-C code in 3GPP TS 26.173 remains the preferred implementation for all applications, but the floating-point codec may be used instead of the fixed-point codec when the implementation platform is better suited for a floating-point implementation. It has been verified that the fixed-point and floating-point codecs interoperate with each other without any artifacts.
The floating-point ANSI C code in the present document is the only standard conforming non-bit-exact implementation of the Adaptive Multi-Rate Wideband speech transcoder (3GPP TS 26.190 [2]), Voice Activity Detection (3GPP TS 26.194 [6]), comfort noise generation (3GPP TS 26.192 [4]), and source controlled rate operation (3GPP TS 26.193 [5]). The floating-point code also contains example solutions for substituting and muting of lost frames (3GPP TS 26.191 [3]).
The fixed-point specification in 26.173 shall remain the only allowed implementation for the 3G AMR-WB speech service and the use of the floating-point codec is strictly limited to other services.
The floating-point encoder in the present document is a non-bit-exact implementation of the fixed-point encoder producing quality indistinguishable from that of the fixed-point encoder. The decoder in the present document is functionally a bit exact implementation of the fixed-point decoder, but the code has been optimized for speed and the standard fixed-point libraries are not used as such.