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292kbs

http://minidisc.org/faq_sec_4.html#r_q21

For a stereo signal it's 292162.5 bits/sec. ATRAC compresses 512 incoming 16 bit samples (1024 bytes) into one ATRAC ``sound group'' (212 bytes) giving an audio compression ratio of 4.83:1. Here is the math:

44100 samples/sec (incoming single channel rate)

/ 512 samples/soundgroup (giving 86.133 soundgroups/sec/channel)

* 2 channels (giving 172.266 stereo soundgroups/sec)

* 212 bytes/soundgroup (giving 36.5K stereo bytes/sec)

* 8 bits/byte (giving stereo bits/sec)

= 292162.5 bits/sec.

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