本欧洲电信标准（ETS）中规定的转码程序适用于数字蜂窝通信系统中的全速率业务信道（TCH）。尚未考虑将此传输编码方案用于其他应用。在GSM 06.01中，显示了数字蜂窝通信系统语音传输通道的参考配置。根据该参考配置，语音编码器将其输入作为13位统一PCM信号，该信号来自移动台的音频部分，或来自PSTN的网络侧，通过8位/a定律到13位统一PCM转换。语音编码器输出端的编码语音被传送到GSM 05中规定的信道编码器单元。 03.在接收方向，反向操作发生。本ETS描述了13位统一PCM格式的160个sp eech样本的输入块到260位s的编码块，以及从260位的编码块到160个重构语音样本的输出块之间的详细映射。采样率为8000 sample/s，编码比特流的平均比特率为13 kbit/s。编码方案是所谓的规则脉冲激励-长期预测线性预测编码器，以下简称RPE-LTP。本ETS还规定了A定律PCM和13位非标准PCM之间的转换。音频输入和输出PAR TS的性能要求仅限于它们影响代码转换器性能的程度。 ETS还将编解码器描述到位级别，从而通过使用一组数字测试序列，在高置信度上验证对ETS的遵从性。这些测试顺序已被描述，并包含在本ETS磁盘中。

The transcoding procedure specified in this European Telecommunication Standard (ETS) is applicable for the full-rate Traffic Channel (TCH) in the digital cellular telecommunications system. The use of this transcoding scheme for other applications has not been considered.In GSM 06.01, a reference configuration for the speech transmission chain of the digital cellular telecommunications system is shown. According to this reference configuration, the speech encoder takes its input as a 13 bit uniform PCM signal either from the audio part of the mobile station or on the network side, from the PSTN via an 8 bit/A-law to 13 bit uniform PCM conversion. The encoded speech at the output of the speech encoder is delivered to a channel encoder unit which is specified in GSM 05.03. In the receive direction, the inverse operations take place.This ETS 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 ETS also specifies the conversion between A-law 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. The ETS also describes the codec down to the bit level, thus enabling the verification of compliance to the ETS to a high degree of confidence by use of a set of digital test sequences. These test sequences are described and are included in this ETS on diskette.