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Re: Comparison of a Raw Analog Audio signal to the CD audio and DVD audio output

76.1.138.16

This graph accurately reports what is MEASURED with a CD or DVD. This is simply the nature of sampled systems. Keeping in mind that at 10kHz, real audio signals are much smaller than they are at 20 Hz, which is why the CD has only a few bits.

Now, the OUTPUT of a CD or DVD is very different than this, but it is also different than the original analog signal, UNLESS it is a very long, continuouse sine wave (not music). In that case the nyquest rules do apply and the analog signal is accurately reproduced.

I must agree that this doesn't really completely explain why vinyl is better than CDs/DVDs (the answer is also in the D/A conversion problem), but it is a useful, but over simplified, way to show the layman that the CD and DVD really don't truely capture the original signal.

Jim E


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