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TS 46.010SA4
Full Rate Speech
Transcoding

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V4.1.0  2001/06  64 p.
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GSM Phase-1 v3.2.0  1992/02  95 p.

Rapporteur:  Mr. Hellwig, Karl

This TS describes the detailed mapping between input blocks of 160 speech samples in 13 bit uniform PCM format to encoded blocks of 260 bits and from encoded blocks of 260 bits to output blocks of 160 reconstructed speech samples. The sampling rate is 8000 sample/s leading to an average bit rate for the encoded bit stream of 13 kbit/s. The coding scheme is the so called Regular Pulse Excitation Long Term prediction Linear Predictive Coder, here after referred to as RPE LTP.
This TS also specifies the conversion between A and u-law (PCS 1900) PCM and 13 bit uniform PCM. Performance requirements for the audio input and output parts are included only to the extent that they affect the transcoder performance. This TS also describes the codec down to the bit level, thus enabling the verification of compliance to this TS to a high degree of confidence by use of a set of digital test sequences.

full Table of Contents for  TS 46.010  Word version:   15.0.0

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1  ScopeWord-p. 7
2  Transmission characteristicsWord-p. 13
3  Functional description of the RPE-LTP codec
4  Codec homingWord-p. 25
5  Computational details of the RPE-LTP codec
5.1  Data representation and arithmetic operations
5.2  Fixed point implementation of the RPE-LTP coderWord-p. 29
5.3  Fixed point implementation of the RPE-LTP decoder
5.4  Tables used in the fixed point implementation of the RPE-LTP coder and decoderWord-p. 42
6  Digital test sequencesWord-p. 43
A  Codec performanceWord-p. 53
B  Test sequence disksWord-p. 62
C  Change historyWord-p. 63

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