"ScottW" wrote in message
news:Wb7wb.4949$ML6.3520@fed1read01
"Arny Krueger" wrote in message
...
"ScottW" wrote in message
news:VPVvb.4621$ML6.516@fed1read01
"Arny Krueger" wrote in message
...
"ScottW" wrote in message
news:AmUvb.4608$ML6.2599@fed1read01
"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
singal 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.