On Sun, 26 Jun 2011 14:54:48 -0400 gene heskett <[email protected]> wrote:
> I do not see how a repeatable, and therefore measurable quadrature > component can be developed in a complex, multi-frequency waveform since the > quadrature component is just as frequency dependent as any other method of > measurement. Really? Because I'm generating some quadrature samples right now - they're how software-defined radios work. In this case you generate two local oscillators 90 degrees apart and use them to switch a pair of synchronous detectors. The resulting downmixed RF is now at audio frequencies (just like a direct-conversion receiver) and can be passed to a soundcard, then processed on the PC to extract a particular signal. See https://github.com/gordonjcp/lysdr if you want to play. Gordon MM0YEQ _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
