ETSI TS 126 104 contains an electronic copy of the ANSI-C code for a floating-point implementation of
the Adaptive Multi-Rate codec. This floating-point codec specification is mainly targeted to be used in multimedia
applications such as the 3G-324M terminal specified in 3GPP TS 26.110, or in packet-based (e.g., H.323) applications.
The bit-exact fixed-point ANSI-C code in 3GPP TS 26.073 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 artefacts.
The floating-point ANSI-C code in this specification is the only standard conforming non-bit-exact implementation of
the Adaptive Multi Rate speech transcoder (3GPP TS 26.090 [2]), Voice Activity Detection (3GPP TS 26.094 [6]),
comfort noise generation (3GPP TS 26.092 [4]), and source controlled rate operation (3GPP TS 26.093 [5]). The
floating-point code also contains example solutions for substituting and muting of lost frames (3GPP TS 26.091 [3]).
The fixed-point specification in 26.073 shall remain the only allowed implementation for the 3G mandatory
speech service and the use of the floating-point codec is strictly limited to other services.
The floating-point encoder in this specification is a non-bit-exact implementation of the fixed-point encoder producing
quality indistinguishable from that of the fixed-point encoder. The decoder in this specification is functionally a
bit-exact implementation of the fixed-point decoder, but the code has been optimized for speed and the standard fixedpoint
libraries are not used as such.
| Edition : | 14.0.0 |
| File Size : | 1
file
, 150 KB |
| Note : | This product is unavailable in Russia, Ukraine, Belarus |
| Number of Pages : | 26 |
| Published : | 04/01/2017 |
