Is it possible to create a pitch shifter using an analog circuit? I know this site is about DSP's but it seems to have a lot of readers, so maybe someone can help me out. Thanks
Analog Pitch Shifter
Started by ●May 29, 2008
Reply by ●May 29, 20082008-05-29
>Is it possible to create a pitch shifter using an analog circuit? I know >this site is about DSP's but it seems to have a lot of readers, so maybe >someone can help me out. > >ThanksWhy do it the hard way when it can easily be done in digital domain?? Regards Bharat
Reply by ●May 30, 20082008-05-30
bharat pathak wrote:>> Is it possible to create a pitch shifter using an analog circuit? I know >> this site is about DSP's but it seems to have a lot of readers, so maybe >> someone can help me out. >> >> Thanks > > Why do it the hard way when it can easily be done in digital domain??Hard or easy, you imply that it can be done. I had thought not. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●May 30, 20082008-05-30
Jerry,
I do not have analog background. So i do not know what can
be achieved and what cannot. By the way are there any good
"analog signal processing" books out there?
Regards
Bharat
>> Why do it the hard way when it can easily be done in digital domain??
>
>Hard or easy, you imply that it can be done. I had thought not.
>
>Jerry
>--
>Engineering is the art of making what you want from things you can get.
>�����������������������������������������������������������������������
>
Reply by ●May 30, 20082008-05-30
Jerry,
I do not have analog background. So i do not know what can
be achieved and what cannot. By the way are there any good
"analog signal processing" books out there?
Regards
Bharat
>> Why do it the hard way when it can easily be done in digital domain??
>
>Hard or easy, you imply that it can be done. I had thought not.
>
>Jerry
>--
>Engineering is the art of making what you want from things you can get.
>�����������������������������������������������������������������������
>
Reply by ●May 30, 20082008-05-30
bharat pathak schrieb:> Jerry, > > I do not have analog background. So i do not know what can > be achieved and what cannot. By the way are there any good > "analog signal processing" books out there?Hi Bharad, No book suggestion. You may want to have a look at analog computers and modular synthesizers. In short you can do the following mathematical operations using analog electronics: - add - subtract - multiply - tanh - exp - square If you add an opamp you get: - divide - log - roots You can approximate other functions like sin or cos either using polynomials. For sin the tanh function can be directly used for small angles. That's enough to do quite a bit of math. All the essential stuff is there. Some of the functions are hard to build in practice if you need high precision and low noise. Temperature compensation is not easy to get right as well. You can do delay using BBD chips or allpass/dome filters. That'll give you some memory if you need it. Not exactly high precision but it works. So an analog-pitch shifter is definately possible, but it will be huge, expensive and most likely it won't sound better than a digital implementation. A more practical way would be to go the electro-mechanical way. You could use a old video recorder (the one with multiple rotating playback-heads). Add some electronics and you get some crude pitch-shifter out of it. AFAIK that's how they did the slow motion playback in the early home-video days. Nils
Reply by ●May 30, 20082008-05-30
bharat pathak ha scritto:> By the way are there any good > "analog signal processing" books out there?Hrowitz-Hill, "The Art of Elecronics". I don't know if it's good and/or it's the answer to your question but... it's the only one I know! HTH. Ciao, Giulio -- OnAir: http://www.giuliopetrucci.it http://www.fujikomonamour.com
Reply by ●May 30, 20082008-05-30
ryder1650 wrote:> Is it possible to create a pitch shifter using an analog circuit? I know > this site is about DSP's but it seems to have a lot of readers, so maybe > someone can help me out.Split the incoming signal into many subbands then compose the shifted signal by combining the subbands. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
Reply by ●May 30, 20082008-05-30
On May 30, 12:31 am, "bharat pathak" <bha...@arithos.com> wrote:> Jerry, > > I do not have analog background. So i do not know what can > be achieved and what cannot. By the way are there any good > "analog signal processing" books out there? > > Regards > BharatGoogle on: "op amp" applications filetype:pdf for a lot of the operational amplifier based possibilities. Dale B. Dalrymple http://dbdimages.com
Reply by ●May 30, 20082008-05-30
Nils wrote:> You can approximate other functions like sin or cos either using > polynomials. For sin the tanh function can be directly used for small > angles.What about an oscillator + low-pass filter for this? Maybe even a "good" oscillator (two poles almost on the imaginary ax) bye. -- piergiorgio
