ITU-T P.83 FRENCH-1993
电话频段和宽带数字编解码器的主观性能评定.电话传输质量.主观意见的测试.12号研究组

SUBJECTIVE PERFORMANCE ASSESSMENT OF TELEPHONE-BAND AND WIDEBAND DIGITAL CODECS

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标准号

ITU-T P.83 FRENCH-1993

发布日期

1993年03月01日

实施日期

废止日期

无

中国标准分类号

M15

发布单位

IX-ITU

适用范围

Digital telephony is now being introduced in the Public Switched Telephone Network (PSTN) at an increasing speed. Since the 1960s, digital transmission in the PSTN has been synonymous to 64kbit/s, A-law PCM (see Recommendation G.711). Now the combination of better knowledge in signal processing techniques and advances in technology, most notably LSWLSI techniques, has lead to an increased interest in more efficient coding methods than PCM. One example of this development is the introduction of 32 kbit/s ADPCM (see Recommendation G.726). More recently a 64 kbit/s, 7kHz wideband codec has been standardized by the CCITT (see Recommendation G.722).