Audio All Pass Filter/Phase Rotator
very interesting. wonder how it would help part 15 am operations? also can you pair them into stereo and use them on part 15 fm and what good (if any) would they do there?
A little more on the circuit and what it does...
http://www.w3am.com/8poleapf.html
if i read that article right then it appears my inovonics 235 already incorporates phase rotating circuitry.
I've seen it in audio mastering software too, and you can clearly see what it does to the wave form on the screenshots, where the voice wave starts mostly above the baseline, then in the after pic the peaks are equal above and below the center. The phase rotation is supposed to cause slight loss in definition on music run through the process, but the RMS voice power is increased a great deal.