"Goofball_star_dot_etal" wrote in message

On Sun, 23 Nov 2003 15:30:04 -0500, "Arny Krueger"
wrote:

"ScottW" wrote in message
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"Arny Krueger" wrote in message
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"Erik Squires" wrote in
message
ervers.com...

So, here's my question. If I digitize a 15 kHz signal, using a
44.1 kHz sampling rate, I'm going to get about 3 samples /
cycle.

Are the normal digital filters good enough to reproduce a 15
kHz signal with varying amplitude?

Deconstruct this signal to frequency domain and it won't be a
pure 15 kHz.

Wrong.

What is the frequency of the amplitude "variation"?

Obviously, 15 KHz.

Show me the Fourier series which contains only 15 kHz components
which results in a 15Khz waveform with "varying amplitude".


A 15 KHz wave itself has varying amplitude. The amplitude varies at
a rate of 15 KHz.

You talk instantaneous values, him talk envelope. Waste time.

That's his choice. If he wants a specific answer he should ask a specific
question.