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Re: C'mon, really. Who's paying you to indiscriminately flack for digital?

If I use 65 dB and 25 KHz and assume the 65 dB is an average value across the bandwidth, Shannon's thereom says the maximum theoretical information capacity of the channel is 539.8 kbps. This value is probably optimistic for two reasons: 1. I believe the dynamic range of an LP falls with frequency, hence the need for RIAA equalization. 2. This ignores crosstalk between channels.

The error rate can be arbitrarily small as long as you allow the code to be arbitrarily big. If you can accept a certain bit error probability, the data rate can be increased, but not by much, e.g. about 3% higher for an error probability of 0.001.

If I use Teresa's numbers of 50 KHz and 90 dB, I get 1495 kbps. Her numbers seem pretty high though and despite a search I couldn't find any references that would back them up. The only analog source I could find that boasted near 90 dB dynamic range was 30 ips tape with Dolby SR.

For comparison, CD has a maximum capacity of 705.6 kbps (regardless of whether you look at the medium from a data storage POV or look at the capacity of 16/44.1 PCM encoding from an information theory POV).

Dave


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