Two equal valued resistors have worked quite well for me in the past... One end of each to L and R sources and tie the floating ends together and take the summed output from there and gnd. Jack Mark Rages wrote: > 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