[sdiy] A different approach to frequency shifting?

[eq927 at freenet.carleton.ca]

The Weaver method, phasing method and "filter" method (using quartz 
crystal filters  to remove unwanted sideband) are the traditional 
approaches for  generating SSB.

The phasing method seems the most suitable/practical for audio 
applications, particularly if you want to do stable, small frequency 
shifts.

It might be possible to use the Weaver method with good results if 
switched-capacitor filters were used for the brickwall function.

Use of a DDS chip to generate stable baseband sin/cos from a single 
reference could be helpful - wide range, low drift, low distortion.
Mike