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Subject: Re: Undersampling and its complement?
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Date: Sat, 2 Nov 2002 02:03:53 -0800
NNTP-Posting-Date: Sat, 02 Nov 2002 02:01:23 MET
Organization: @Home Network
"James Meyer" wrote in message
> I have to extract information from an 8 MHz signal. Nyquist says that
> 16 MHz should be my minimum sampling frequency. However... if the
> the signal I'm interested in is something like 10 KHz centered around 8
> then I really only need to sample at 2 times 10 KHz, let the signal be
> or aliased down to 0 to 10 KHz and I wil not have lost any information.
> My question is.... is there anything similar regarding generating an 8
> MHz signal? Do I really need a 16 MHz or better DAC in order to generate
> signals if the signal will not have a very wide bandwidth?
Yes you do. The bandwidth of the signal is 8Mhz, not the 10Khz you want
modulate it with. The 10kHz is modulation depth, not bandwidth.
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