ETSI TS 126 204 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.
| Edition : | 14.0.0 |
| File Size : | 1
file
, 130 KB |
| Note : | This product is unavailable in Russia, Ukraine, Belarus |
| Number of Pages : | 23 |
| Published : | 04/01/2017 |
