音频文件格式，包括WAV、ADPCM、CDR，另外还有AU文件格式，后面的音频数据即可以是一般的数据，也支持按CCITT G.721 (32 kbit/s) 和 G.723 (24/40 kbit/s)格式压缩好的音频数据-audio file formats, including WAV, ADPCM, CDR, another AU document format, as the audio data that may be general information, and support

The files in this directory comprise ANSI-C language reference implementations of the CCITT (International Telegraph and Telephone Consultative Committee) G.711, G.721 and G.723 voice compressions. They have been tested on Sun SPARCstations and