On 1/27/06, Mike Hawkshaw wrote: > Hi, > > Tag added..... > > To produce a mono signal from a stereo one, you simply need to add the left > and right siganls together (which is what your ears would do to get the mono > signal if you were a long way away from the loudspeakers). > > You could do this using an op amp (ne5534 or better) as an adder or possibly > by taking the left and right pcm values and adding them together and scaling > before conversion. > > Cheers...Mike. > Be warned, this will introduce phasing artifacts with most stereo material (a nasty smearing sound in the high frequencies). I don't know of any way around this. Perhaps window, FFT, add together in the frequency domain, inverse FFT? That treatment will discard the phase information. Note, I haven't tried this. Regards, Mark markrages@gmail -- You think that it is a secret, but it never has been one. - fortune cookie -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist