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Re: Nyquist Frequency

>>Example: 48KHz digital A/D converter could capture a 23KHz
>> > sine wave, and output a 23KHz sine wave whose amplitude varies at 1Khz
>>- you
>> > would hear that 1Khz signal for sure!
>>Frequencies below Nyquist come through without any change.
> well, why don't you actually try it :-)
> I did, the 1khz tone is not very loud, but it's there.

yes, but remember that your system (don't know what you used) most likely 
already has the anti-aliasing filter on it so these effects will be very 
very attenuated - as will the 23KHZ signal.

> Not every fact is in the textbooks ;-)

you got that right!