  CNET GLOSSARY: Terms for the techie
TrueSpeech
A speech compression codec from the DSP Group that reduces the signal to 8,000Hz, in mono, with a bit depth of 1. This means that the sound goes through at a rate of 1Kbps--an eighth the size and rate of the smallest PCM audio files (such as WAV and AIFF files) and a quarter the size of the smallest ADPCM files. 
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