Re: Generating variable frequency tones
Re: Generating variable frequency tones
- Subject: Re: Generating variable frequency tones
- From: vincent habchi <email@hidden>
- Date: Fri, 10 Sep 2010 10:19:59 +0200
Le 9 sept. 2010 à 21:58, Remco Poelstra a écrit :
> I'm looking for some way to generate a tone that resembles the sound of an instrument. I need precise control of the base frequency (pitch). I'm wondering what would be the best way to generate it on an iPhone.
> Store a file with a know frequency and resample it to the desired frequency? Synthesize a tone by calculating a bunch of sines? Doing some FFT trick on a file?
> If someone can give some insight into what would best fit the H/W available it would be grateful.
Basically, that's not really a Cocoa related question. If you want to generate a sine wave with a very precise frequency, try to dig into the fairly simple DDS theory. That's the way HF generators achieve sub-hertz step precision at 100 MHz or above. Very easy to replicate on an iPhone.
Veel gluck, tot ziens,
Vincent_______________________________________________
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