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Re: [Discuss-gnuradio] first attempt at gnuradio - ssb phasing demod

From: Charles Swiger
Subject: Re: [Discuss-gnuradio] first attempt at gnuradio - ssb phasing demod
Date: Tue, 07 Mar 2006 16:12:54 -0500

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.


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