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Bit Rate Reduction
From SnesLab
Bit Rate Reduction or BRR is the name given to the audio compression method used on the SPC700 sound chip used in the [[SNES], as well as the audio processors of a few other consoles. It is a form of ADPCM.
BRR uses blocks of 9 bytes, which decompress to create 16 16-bit samples. This gives a compression ratio of 32:9. Aside from using a form of streaming to the echo buffer, this is the only sound format the APU can play back (it cannot play uncompressed samples).