MOTM

Hi, Does anyone know of a company that makes an Analog Voltage 
Controlled Pitch shifter? (MOTM Quality)

> Hi, Does anyone know of a company that makes an Analog Voltage 
> Controlled Pitch shifter? (MOTM Quality)

All together now: ENCORE ELECTRONICS FREQUENCY SHIFTER

www.encoreelectronics.com

and it's 'stereo' too

cheers
paul

Strictly speaking, a pitch shifter is different than a frequency
shifter. Pitch shifting maintains the harmonic relationships,
frequency shifting mangles them as it spreads them. 

Frequency shifting is hard to do precisely, but I've personally never
heard of a VC pitch shifter. Maybe some of the Lexicon or other rack
effects boxes which do pitch shifting have a VC input, but they are
digital anyway.

Which exactly were you interested in?

Moe

> > Hi, Does anyone know of a company that makes an Analog Voltage 
> > Controlled Pitch shifter? (MOTM Quality)
> 
> All together now: ENCORE ELECTRONICS FREQUENCY SHIFTER
> 
> www.encoreelectronics.com
>

> > Hi, Does anyone know of a company that makes an Analog Voltage
> > Controlled Pitch shifter? (MOTM Quality)
> 
> All together now: ENCORE ELECTRONICS FREQUENCY SHIFTER

Um, no. A frequency shifter and a pitch shifter are not the same thing.

--Adam
(primary author of Discord, Audio Damage's pitch shifter plug-in, and of a
not-yet-released frequency shifter) 

--
Adam Schabtach
adam@...
www.audiodamage.com

There is no such thing as an analog Pitch Shifter.  At least as far 
as I know.  I suppose one could be built if you could find a charge 
coupled bucket brigade type device capable of high enough quality, 
but that's unlikely.  All pitch shifters are digital and break the 
incoming signal into samples just like digital delays.  There are 
always trade offs involved in making a pitch shifter as well, as 
improved pitch accuracy and improved timing accuracy are somewhat 
mutually exclusive.  

I think what you are really looking for is a pitch shifter which can 
accept a control voltage to control the amount that the signal is 
shifted in pitch.  This is also difficult to accomplish.  Most 
Digital Delay devices which are capable of analog voltage control 
actually step between delay values rather than continuously changing 
value.  This tends to cause zipper noise.  In order to vary the 
delay (or the pitch) continuously the sample rate clock must be 
voltage controlled.  While not impossible, this is quite difficult.  
If you are sampling at 48 kHz which would give you a maximum input 
frequency of around 20 kHz, and then you wanted to either decrease 
the delay time or raise the pitch by two octaves, your sample rate 
clock would now be running at 192 kHz.  If you slow down below 48 
kHz you will lose high end response or generate some truly nasty 
artifacts, so the effective range is only about 2 octaves using 
modern converters if you want to be continuously variable without 
stepping.

It may be possible to get more range with a delta/sigma scheme or by 
using a flash converter with a compander.  This is something I'm 
personally interested in exploring, as I'm interested in the musical 
applications of delay lines, but I haven't had time to play around 
with any kind of circuit design yet.

The frequency shifter is another animal entirely.  The Encore 
Electronics module is quite wonderful, but as someone else pointed 
out a frequency shifter does not maintain the integer spacing of 
harmonics present in the input signal, so it really does not shift 
pitch.

oops
i think i got over excited on that last post and didn't read it properly, so
repeat after me:

Eventide H949 Harmonizer

you can get them in the uk for around \ufffd250, the pitch can either be voltage
controlled or clocked via a VCO
i've got an H949 and i love it - i'm not too sure what facilities are
available on the H910 which is far cheaper on the s/h market
as far as i know, the H910 & H949 are analogue pitch shifters

cheers
paul (ducking this time)

----- Original Message -----

From: "paulhaneberg" <phaneber@...>
To: <motm@yahoogroups.com>
Sent: Monday, December 27, 2004 6:47 PM
Subject: [motm] Re: Pitch Shifter


>
>
> There is no such thing as an analog Pitch Shifter.  At least as far
> as I know.  I suppose one could be built if you could find a charge
> coupled bucket brigade type device capable of high enough quality,
> but that's unlikely.  All pitch shifters are digital and break the
> incoming signal into samples just like digital delays.  There are
> always trade offs involved in making a pitch shifter as well, as
> improved pitch accuracy and improved timing accuracy are somewhat
> mutually exclusive.
>
> I think what you are really looking for is a pitch shifter which can
> accept a control voltage to control the amount that the signal is
> shifted in pitch.  This is also difficult to accomplish.  Most
> Digital Delay devices which are capable of analog voltage control
> actually step between delay values rather than continuously changing
> value.  This tends to cause zipper noise.  In order to vary the
> delay (or the pitch) continuously the sample rate clock must be
> voltage controlled.  While not impossible, this is quite difficult.
> If you are sampling at 48 kHz which would give you a maximum input
> frequency of around 20 kHz, and then you wanted to either decrease
> the delay time or raise the pitch by two octaves, your sample rate
> clock would now be running at 192 kHz.  If you slow down below 48
> kHz you will lose high end response or generate some truly nasty
> artifacts, so the effective range is only about 2 octaves using
> modern converters if you want to be continuously variable without
> stepping.
>
> It may be possible to get more range with a delta/sigma scheme or by
> using a flash converter with a compander.  This is something I'm
> personally interested in exploring, as I'm interested in the musical
> applications of delay lines, but I haven't had time to play around
> with any kind of circuit design yet.
>
> The frequency shifter is another animal entirely.  The Encore
> Electronics module is quite wonderful, but as someone else pointed
> out a frequency shifter does not maintain the integer spacing of
> harmonics present in the input signal, so it really does not shift
> pitch.
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>

Way back in the 70's I used to get a pitch shift effect by driving an analog delay with a sawtooth control voltage. It's quite crude, and the saw needs to be pretty pure (not too hard with an MOTM oscillator driving it), and it has to be "positive-going" (back then we called 'inverted' sawtooths 'ramps' but that distinction seems to have faded with time and the terms are used interchangeably now). You could hear imperfections in it, but I thought it was kinda cool at the time.
 
KAT

According to the Eventide web site the H910, their first harmonizer, is a
"versatile digital delay line" and harmonizer.  So the pitch shifting is
digital, not analog.

John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com

> -----Original Message-----
> From: Sikorsky [mailto:vulture.squadron@...]
> Sent: Monday, December 27, 2004 1:23 PM
> To: motm@yahoogroups.com; paulhaneberg
> Subject: Re: [motm] Re: Pitch Shifter
> 
> 
> oops
> i think i got over excited on that last post and didn't read it properly,
> so
> repeat after me:
> 
> Eventide H949 Harmonizer
> 
> you can get them in the uk for around £250, the pitch can either be
> voltage
> controlled or clocked via a VCO
> i've got an H949 and i love it - i'm not too sure what facilities are
> available on the H910 which is far cheaper on the s/h market
> as far as i know, the H910 & H949 are analogue pitch shifters
> 
> cheers
> paul (ducking this time)
>

--- In motm@yahoogroups.com, "paulhaneberg" <phaneber@o...> wrote:
> 
> There is no such thing as an analog Pitch Shifter.  At least as far 
> as I know.  

If I remember correctly, the mathematician Dennis Gabor (of Gabor Wavelet fame) built an 
analogue pitch-shifter using a drum wrapped in tape and read/record tape heads that 
rotated around it.  All completely analogue, but I suspect it didn't exactly sound like a 
high-end Eventide :-)

Harry

hello all,
i had to go look at the manual - the Eventide H949 is indeed digital
so that would be a case of too much wine and not enough harmonizing
still, it is xmas...
cheers - paul

AFAIK there are *no* analog pitch shifters. It's a very expensive 
effect and one that doesn't lend itself to analog circuits too well. 
Feel free to prove me wrong though :) As far as a CV controlled pitch 
shifter, your best bet is probably the Eventide Eclipse. Its voltages 
are a little different, and you can't just plug something straight in 
(need funky cable), but it does work. As a word of caution, I've found 
that the company has a rather "snotty" attitude and can be a bit 
difficult to work with, but they make great effects. (Well, except 
there delays, but anyway...)

 From the manual:
"Stereo 1/4-inch connectors. The sleeve is ground reference, the ring 
is a +5 volt (source),
and the tip is an analog signal between 0 to 5 volts input to the 
Eclipse. Connect either foot
switches, foot pedals, or control voltage sources to these inputs to 
modulate parameters or
to trigger events"

If you want a frequency shifter I highly recommend the Encore 
Electronics MFS01, it's awesome :)

--mikes

On Dec 27, 2004, at 11:45 AM, John Loffink wrote:

> According to the Eventide web site the H910, their first harmonizer, 
> is a
> "versatile digital delay line" and harmonizer.  So the pitch shifting 
> is
> digital, not analog.
>
> John Loffink
> The Microtonal Synthesis Web Site
> http://www.microtonal-synthesis.com
> The Wavemakers Synthesizer Web Site
> http://www.wavemakers-synth.com
>
>
> > -----Original Message-----
> > From: Sikorsky [mailto:vulture.squadron@...]
> > Sent: Monday, December 27, 2004 1:23 PM
> > To: motm@yahoogroups.com; paulhaneberg
> > Subject: Re: [motm] Re: Pitch Shifter
> >
> >
> > oops
> > i think i got over excited on that last post and didn't read it 
> properly,
> > so
> > repeat after me:
> >
> > Eventide H949 Harmonizer
> >
> > you can get them in the uk for around £250, the pitch can either be
> > voltage
> > controlled or clocked via a VCO
> > i've got an H949 and i love it - i'm not too sure what facilities are
> > available on the H910 which is far cheaper on the s/h market
> > as far as i know, the H910 & H949 are analogue pitch shifters
> >
> > cheers
> > paul (ducking this time)
> >
>
>
>
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