Generating negative harmonics
in [DSP]
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From: Albert van der Horst on 22 Mar 2010 16:57 In article <JJednb9l8szkYz3WnZ2dnUVZ_hGdnZ2d(a)web-ster.com>, Tim Wescott <tim(a)seemywebsite.now> wrote: >jacko wrote: >> Hi >> >> Sub harmonics? umm. integrate your signal, comparator slice it with >> the LPF DCish of your signal, feed back some of this square wave after >> dividing by two via a schmitt trigger FF into your signal. Low pass >> filter this and add some to your original signal to make the sub >> harmonic enhanced version. >> >> Cheers Jacko >> >> p.s. don't forget the sub base W bins. ;-) > >This works well with signals that have a strong fundamental, like >guitar. In fact, there's a guitar effect that does just this. For >signals that lack the fundamental (bells), or where the fundamental is >of lower strength than the harmonics (can't think off the top of my head >-- don't brass instruments do this?) it won't work. It should work if there are clear zero crossings. Imagine a signal consisting of peaks, should be now problem. In such a signal the fundamentals could be very low. > >-- >Tim Wescott >Control system and signal processing consulting >www.wescottdesign.com -- -- Albert van der Horst, UTRECHT,THE NETHERLANDS Economic growth -- being exponential -- ultimately falters. albert(a)spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst |