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Another way to look at it, SQNR = 20 * log10(2**Q).

When Q=8, equivalent to 8bit PCM encoding, the maximum SNR would be 48db. So the cheap cassettes are like 8bit PCM at 12kHz.

Remaining values would be:

Q=9, SQNR=54db.

Q=10, SQNR=60db.

Q=11, SQNR=66db.




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