vanya wrote:
>> vanya wrote:
>>> Hi all,
>>> Im currently doing my final year project based on an Audio frequency
> pitch
>>> detector. I'm using the Analog- to- digital technique to extract the
>>> fundamental frequency of any sound that the device detects. However, I
>>> would like o know how using DSP chip is better to detect pit in
> comparison
>>> to ADC? Is there any downsides for using DSP chip instead?
>> What are you talking about? An A-to-D converter works on the whole 
>> signal, not on a particular harmonic of your choosing. A DSP chip can't 
>> directly deal with analog signals; there needs to be an A-to-D converter
> 
>> to get the signal it will work on. So you need both, and also some 
>> understanding of the tools and devices involved.

   ...

> Actually, by that I men, designing a complete Analogue Pitch detector
> instead of a digital one

It will be hard to design an analog filter bank that's selective enough.
Semitones are six percent apart and a pitch detector needs to be much 
more selective than that. You might try a phase-locked loop with a 
digital frequency meter (a couple of counters and a crystal oscillator) 
reading the local oscillator.

Jerry
-- 
Engineering is the art of making what you want from things you can get.
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

>vanya wrote:
>> Hi all,
>> Im currently doing my final year project based on an Audio frequency
pitch
>> detector. I'm using the Analog- to- digital technique to extract the
>> fundamental frequency of any sound that the device detects. However, I
>> would like o know how using DSP chip is better to detect pit in
comparison
>> to ADC? Is there any downsides for using DSP chip instead?
>
>What are you talking about? An A-to-D converter works on the whole 
>signal, not on a particular harmonic of your choosing. A DSP chip can't 
>directly deal with analog signals; there needs to be an A-to-D converter

>to get the signal it will work on. So you need both, and also some 
>understanding of the tools and devices involved.
>
>Jerry
>-- 
>Engineering is the art of making what you want from things you can get.
>¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
>

Actually, by that I men, designing a complete Analogue Pitch detector
instead of a digital one


_____________________________________
Do you know a company who employs DSP engineers?  
Is it already listed at http://dsprelated.com/employers.php ?

vanya wrote:
> Hi all,
> Im currently doing my final year project based on an Audio frequency pitch
> detector. I'm using the Analog- to- digital technique to extract the
> fundamental frequency of any sound that the device detects. However, I
> would like o know how using DSP chip is better to detect pit in comparison
> to ADC? Is there any downsides for using DSP chip instead?

What are you talking about? An A-to-D converter works on the whole 
signal, not on a particular harmonic of your choosing. A DSP chip can't 
directly deal with analog signals; there needs to be an A-to-D converter 
to get the signal it will work on. So you need both, and also some 
understanding of the tools and devices involved.

Jerry
-- 
Engineering is the art of making what you want from things you can get.
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

Hi all,
Im currently doing my final year project based on an Audio frequency pitch
detector. I'm using the Analog- to- digital technique to extract the
fundamental frequency of any sound that the device detects. However, I
would like o know how using DSP chip is better to detect pit in comparison
to ADC? Is there any downsides for using DSP chip instead?

Thanks in advance




_____________________________________
Do you know a company who employs DSP engineers?  
Is it already listed at http://dsprelated.com/employers.php ?