Unitech PA950 - Manual (Page 86)

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Mobile Voice is a 2.4 KB audio codec (compressor decompressor). It is the
recommended format because it provides good voice recording and takes
far less storage space than PCM.
Pulse Code Modulation (PCM) provides slightly better sound quality.
However, PCM recordings may take up to 50 times more storage space
than Mobile Voice recordings. PCM cannot be used to create recordings
that are embedded in notes.
See Also: Change options