On Sun, 2006-03-05 at 00:48 -0500, Robert McGwier wrote:
Almost. Translate the carrier to where you want it to be and then use a
complex bandpass filter to pick off the sideband.
make the filter edges L < H for your favorite bandwidth (H-L)
for USB, make a complex filter with edges L, H
for LSB, make a complex band pass filter with edges
-H, -L
Take the real part, make imaginary part = real part.
send complex signal to sound card.
Do we have tools to make complex (negative freq) filter coeffecients?
(other than externally in matlab etc). I see 'optfir' but looks like
it makes float taps too.
--Chuck
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