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Dave Booth Member |
posted 12 July 2002 07:19
 
A suggestion for a new selection criterion in the spectrum editor: I've been working on some old live tapes, and one of them suffers from a harmonically rich buzz that was caused by interference from a lighting fader. I've done a harmonic analysis of part of the tape and I'm looking at it in the spectrum editor, wondering if I could synthesize the buzz waveform and try to subtract it using a phase locking technique. But it's difficult to pick out the buzz components. It strikes me that the tracks corresponding to the buzz must be pretty flat in both amplitude and frequency, except when there happens to be a nearby frequency in the music signal. So if there were a criterion along the lines of "Select tracks where average deviation from mean pitch/mean amplitude is below x" it would home straight in on the main components of the buzz. I think it might be useful as a way of distinguishing a note or chord in a noisy spectrum, too. Just a suggestion. Meanwhile I'll see if I can fix the buzz with delay lines without making the whole track too flangey... Dave IP: Logged |
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SSC Administrator |
posted 12 July 2002 10:04
That's an interesting idea! As for removing the buzz, what about the idea of using a comb filter (i.e. the delay that you've already mentioned). If you cascade two or more comb filters, you may be able to get the pass bands narrow enough that you could knock out the harmonics without too much of the flangey effect... IP: Logged |
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Dave Booth Member |
posted 14 July 2002 05:59
Getting a standard deviation for each track should be a fairly modest task (in terms of the load on the processor, that is - needs a rolling sum and a rolling sum of squares - I did this sort of thing when I was analysing mainframe response times in an earlier career...) As to comb filtering the hum, adding a half-wavelength delay sounds easier on the ear (mine at least) than subtracting a full wavelength delay. Still working on it... Dave IP: Logged |
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