ETSI TS 126 204

ETSI TS 126 204 contains an electronic copy of the ANSI-C code for the Floating-point Adaptive Multi-RateWideband codec. This floating-point codec specification is mainly targeted to be used in multimedia applications or inpacket-based applications. The bit-exact fixed-point ANSI-C code in 3GPP TS 26.173 remains the preferredimplementation for all applications, but the floating-point codec may be used instead of the fixed-point codec when theimplementation platform is better suited for a floating-point implementation. It has been verified that the fixed-pointand 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 implementationof 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 lostframes (3GPP TS 26.191 [3]).

The fixed-point specification in 26.173 shall remain the only allowed implementation for the 3G AMR-WB speechservice 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 encoderproducing quality indistinguishable from that of the fixed-point encoder. The decoder in the present document isfunctionally a bit-exact implementation of the fixed-point decoder, but the code has been optimized for speed and thestandard fixed-point libraries are not used as such.

Edition:

13.0.0

Published:

01/01/2016

Number of Pages:

21

File Size:

1 file , 150 KB

Note:

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