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Time stretching/pitch shifting without DSP, possible or not?
bennetng
post Sep 18 2012, 10:47
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I mean time stretching without changing pitch and pitch shifting without changing speed.

I ask this because my friend recently purchased a turntable (Stanton ST150) and it has time stretch function.

http://www.stantondj.com/pdf/products/turn...t150_manual.pdf

The manual says

QUOTE
Note: This turntable has separate analog and digital circuits. If you are
looking for a purely analog signal, use the Phono output. For access to
the Key correction feature use the Line output or S/P DIF output.


QUOTE
Note: Key lock and Digital output
processing is only available when the LINE
output is used.


So from my common sense and English level (not my native language), the line out is in fact converted from digital. But my friend insisted on thinking that the processing is done in analog domain and said if EQ can be done in analog domain, why time stretching/ pitch shifting can't?

What is your opinion?
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dumdidum
post Sep 18 2012, 17:42
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QUOTE (pdq @ Sep 18 2012, 18:26) *
QUOTE (mzil @ Sep 18 2012, 11:43) *
It is possible to do analog pitch shifting although I doubt any TT on the market does.

Analog pitch shifting without time stretching? Are you sure about that? Do you have a link?
http://en.wikipedia.org/wiki/Pitch_shift " It could be accomplished on an early reel-to-reel tape recorder by changing the diameter of the capstan drive shaft, or using a different motor."

This post has been edited by dumdidum: Sep 18 2012, 17:43
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benski
post Sep 18 2012, 17:50
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QUOTE (dumdidum @ Sep 18 2012, 12:42) *
QUOTE (pdq @ Sep 18 2012, 18:26) *

Analog pitch shifting without time stretching? Are you sure about that? Do you have a link?
http://en.wikipedia.org/wiki/Pitch_shift " It could be accomplished on an early reel-to-reel tape recorder by changing the diameter of the capstan drive shaft, or using a different motor."


This time-stretches as well
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mzil
post Sep 18 2012, 18:57
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QUOTE (benski @ Sep 18 2012, 12:50) *
QUOTE (dumdidum @ Sep 18 2012, 12:42) *
QUOTE (pdq @ Sep 18 2012, 18:26) *

Analog pitch shifting without time stretching? Are you sure about that? Do you have a link?
http://en.wikipedia.org/wiki/Pitch_shift " It could be accomplished on an early reel-to-reel tape recorder by changing the diameter of the capstan drive shaft, or using a different motor."


This time-stretches as well


I owned a pitch shifter in the 70's(?) or 80's that was fully electronic and had no reliance on tape transport and didn't time stretch. Although Lexicon and Eventide now do digital stuff, back then their processors like the Harmonizer H910 and the Lexicon Varispeech (c. early 1970's) were analog. [Mine was on a bread board my father built, but I think it was the same circuitry.] [edit to add: Oops, I guess it was digital. My bad. I owned it so many years before CD I just assumed it was analog!]

I owned a VCR which could play at double speed with "Chipmunks" audio, at the time. I would connect its output to the pitch shifter and corrected the pitch, but of course maintained the fast speed. I remember that I was able to watch/hear a one hour news program or talk show in only 20 minutes or so (that included fast forwarding through the commercials). I was the only person I knew of who thought to do this. Keep in mind this was decades before Tivos and other DVRs were on the scene.

This post has been edited by mzil: Sep 18 2012, 19:15
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Posts in this topic
- bennetng   Time stretching/pitch shifting without DSP   Sep 18 2012, 10:47
- - dumdidum   this is def done digitally. the point is, many DJ...   Sep 18 2012, 11:01
- - bennetng   QUOTE but people are still fully convinced that th...   Sep 18 2012, 14:14
|- - dumdidum   QUOTE (bennetng @ Sep 18 2012, 15:14) QUO...   Sep 18 2012, 15:52
|- - greynol   QUOTE (bennetng @ Sep 18 2012, 06:14) QUO...   Sep 18 2012, 18:15
|- - bennetng   QUOTE (greynol @ Sep 19 2012, 01:15) QUOT...   Sep 18 2012, 18:26
|- - greynol   QUOTE (bennetng @ Sep 18 2012, 10:26) Ple...   Sep 18 2012, 18:37
- - mzil   It is possible to do analog pitch shifting althoug...   Sep 18 2012, 16:43
|- - pdq   QUOTE (mzil @ Sep 18 2012, 11:43) It is p...   Sep 18 2012, 17:26
||- - benski   QUOTE (pdq @ Sep 18 2012, 12:26) QUOTE (m...   Sep 18 2012, 17:49
||- - pdq   QUOTE (benski @ Sep 18 2012, 12:49) There...   Sep 18 2012, 17:56
|- - Arnold B. Krueger   QUOTE (mzil @ Sep 18 2012, 11:43) It is p...   Sep 20 2012, 19:11
- - bennetng   So are there any dedicated analog machines doing t...   Sep 18 2012, 17:06
- - dumdidum   QUOTE (pdq @ Sep 18 2012, 18:26) QUOTE (m...   Sep 18 2012, 17:42
|- - benski   QUOTE (dumdidum @ Sep 18 2012, 12:42) QUO...   Sep 18 2012, 17:50
|- - mzil   QUOTE (benski @ Sep 18 2012, 12:50) QUOTE...   Sep 18 2012, 18:57
- - John_Siau   I seem to recall that there were analog frequency-...   Sep 18 2012, 19:36
- - mzil   A 1968 example of the tape based "Electro Rat...   Sep 18 2012, 19:44
- - John_Siau   Here is a link to an old BBD data sheet from 1975....   Sep 18 2012, 19:47
- - bennetng   Thanks for the explanations. Then I guess the anal...   Sep 18 2012, 19:59
- - krabapple   On a two recent remixes by Steve Wilson (one the 1...   Sep 19 2012, 17:30
|- - bennetng   Most samplers/romplers support this kind of pitch ...   Sep 19 2012, 17:55
|- - mzil   QUOTE (krabapple @ Sep 19 2012, 12:30) It...   Sep 19 2012, 18:30
- - greynol   I don't think pitch correction which also chan...   Sep 19 2012, 18:46
|- - krabapple   QUOTE (greynol @ Sep 19 2012, 13:46) I do...   Sep 19 2012, 20:40
- - greynol   From what I understand of Wilson, he's not exa...   Sep 19 2012, 21:46
|- - krabapple   QUOTE (greynol @ Sep 19 2012, 16:46) From...   Sep 20 2012, 00:03
- - krabapple   so, just for giggles, using Audition 1.0 's ...   Sep 27 2012, 00:09


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