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hi guys, is there a device that will allow for a pitch control of 10 to 15% with not much discernable distortion. it could be stand alone or built into a tape or cd player, or mixer, but not digital. thanks, bobr
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Sorry, I know this is an old thread, but I only just discovered this forum.The Roland VP9000 Variphrase processor is supposed to be pretty good.
And, of course, anything by Eventide. They are famous for their pitch shifters -- that's where they initially developed their reputation. They recently came out with an entry level (for them) product.
There is no such thing in the analog realm, unless you're not worried about slowing down or speeding up the recording, in which case, it would have to be built into the record, tape, or CD player.
It can be built into a CD player, but not digital? Ich verstehe dich nicht...
A *speed* control is the only thing that won't actally cause any type of artifacts other than slowing down or speeding up the audio...I don't think there has ever been an analog device that allows pitch shift. -The Eventide Harmonizer, AMS DMX 15-80, and all the susbequent pitch control devices were all digital. -They work by reading signal into a memory, and reading it back out a fraction of a second later, at a different speed. Let's say you're playing it back faster, to increase the pitch. Sooner or later, the information is going to run out, since you're "emptying the bucket faster than you're filling it" -to strike an analogy. The simple answer is to repeat some sections of the signal, by jumping back in time before the information in the memory buffer runs out.
These 'jumps' are known as 'glitches', and some manufacturers (AMS were a good example) developed algorythms that made the 'jumps' at same-direction zero-crossing points to make the transistions less audible. (the "de-Glitch" card on the DMX-15-80S)
Likewise, when shifting pitch down, the information is read out slower than it is added, so to prevent "bucket overflow", some information is discarded, and never played back.
Voila. -That's how a standard harmonizer works. -There's no real analog analogy, although I did work on a design that used three CCD devices, cross-fading between them, and "flushing" the muted device... whilst not digital, it sounded significantly worse, (noisier... well it's a bucket-brigade device) and was limited to significantly sub-octave shift range.
Nowadays, glitch-free near real-time, formant-preserving (i.e. humans stil sound like humans at a different pitch... not monsters or chipmunks... -it's really spookily good... a man can sound like a woman, or bice-versa!) pitch processing is available in software, employing spectrally-based processing.
Go digital. Long live analog, (It's my life, I tell ya!) -but this is one job that really needs to be done by a computer!
Keith
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