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Re: Hi Ted.

Thanks for the pic info Ted..

""And if you are bandlimited you have many cycles of your signal so you see the correct peaks, etc.""ted

Agreed..but look at your 14 khz waveform...you really have to wait around to see the sample coincide with the actual peak of the waveform. You are making the connection in your thinking that when the two coincide, that is the actual wave amplitude..

Reconstruction of that signal by a DAC...For the dac to really output the correct amplitude of that signal, it has to look over many samples to get the right amplitude..Hence, my point..

Now, if you were to "connect the dots", so to speak, with some filtering, you should see some envelope modulation..what is interesting is that the top of that envelope is not symmetric with the bottom one, there will be a frequency component there. And, nyquist math does not produce that artifact, unless you include the FIR response of real filters, representing the very few samples that are actually available to the filter. Also, don't forget, Nyquist math requires sample lookahead in order to work..

Thanks Ted

John




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