On Fri, 2012-02-10 at 21:08 -0500, Andy Walls wrote: > > Randomly checking some of the data with GNUplot, if 2.5 Msps is the > sampling rate, then the fastest freq I saw was about 50 kHz. How'd you analyze the data - assume it was baseband I/Q and do an FFT? If so, and if this was digitized baseband, you should have seen the FM stereo pilot tone at 19kHz.
If it's digitized IF, you should be able to run it through a rectangular to polar conversion (compute mag = I^2+Q^2 and phase = arctan(I/Q) (use a proper 4 quadrant arctan), then compute frequency by the delta between the phase samples. Mag should be constant, frequency would then be your audio. -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
