[sdiy] analog pitch shifter circuit?

[synthplayer88 at spymac.com]

The problem is the sampling frequency at ONLY 8 khz which will only capture less
than 4Khz, that is pretty pathetic..... To increase the performance you would
need increase the memory running and running at a higher sampling rate, not to
mention the processing power of the chip.....

Might as well build the whole thing from scratch and choose your own AD
converter, uController with built in ROM and external ram then convert D to A.
After you figure out how to write the assembly code to achieve this......

What I am afraid of is latency, which is critical dependent on your assembly code...

Any more thoughts guys?

I think I am going to give up doing this in analog but until I am close to any
good at programming in DSP, I am gonna have to give up doing this.....



On Tue Jan  4  2:19 , Andreas Gaunitz <andreas.gaunitz at konstfack.se> sent:

>I noticed in the specs that it can go up 1 octave, but only a third of 
>an oct down. I wonder what would happen if you used 2 in a row, or used 
>feedback...
>
>-Andreas
>
>-------------------------------------------------
>
>2005 jan 04  kl. 00.03 skrev rdrake:
>
>> as you say, probably very lo fi:
>>
>> http://www.j-tron.com/pom.htm
>>
>> but for $15, i'll probably give it a try.  hey, it's 2005: lo-fi is 
>> the new black...
>>
>> lbd
>>
>>> From: synthplayer88 at spymac.com>
>>> To: synth-diy at dropmix.xs4all.nl>
>>> Sent: Monday, January 03, 2005 4:35 PM
>>> Subject: [sdiy] analog pitch shifter circuit?
>>>
>>>
>>> Hi guys,
>>> I was wondering if anyone know how does the boss
>>> voice transformer achieve
>>> the
>>> voice pitch shifting?
>>> I would like to build an analog pitch shifter
>>> does what the Boss voice
>>> transformer do but I am not sure if that is an
>>> analog circuit, since all
>>> their
>>> new pedals such as the  PS3 and PS5 are all
>>> digital circuits.
>>>
>>> I came accross this chip that does pitch shifting
>>> but only has preset
>>> shift and 8
>>> Khz sampling rate :(
>>> which seems to be kinda lo fi...
>>>
>>>
>>> http://www.holtek.com/english/docum/consumer/8950.h
>>> tm
>>>
>>> Does anyone know of any monolithic IC that can do
>>> what this IC does but
>>> with more
>>> flexibility? eg. allows precise pitch shift of
>>> any notes up to serveral
>>> octaves.
>>>
>>> Oh, please do not suggest any DSP or
>>> uControllers. I would like to avoid
>>> ANY
>>> programming and looking for a simplest circuit to
>>> do this if possible :)
>>>
>>> How can I apply FM into this? eg. multiply the
>>> sound source by 2, 4, 8
>>> hz.....
>>> Can this be done?
>>>
>>> Thoughts?
>>>
>>>
>>
>