Playing .wav file at frequencies from 20Hz-20,000Hz

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I am developing a winForm application in c#. I want to play a .wav file at different frequencies (not at different sample rates i.e. 440Hz, 220Hz etc.). I want audible frequencies from 20Hz to 20,000Hz. Can anybody help me in this problem!

Posted 15-Jul-13 23:50pm

mansurmojom

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Bernhard Hiller 16-Jul-13 10:55am

Do you want to create sounds with those frequencies and play the sounds?

mansurmojom 16-Jul-13 11:54am

No, I have a sound file and I want to change its frequency programmatically during runtime and play it!

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CPallini · Answer 1 · 2013-07-16T00:05:00

As far as I know, if you play a WAV file at different sample rates (if you can do it) then you get different frequencies (suppose you have a file containing a 440 hz sound at sample rate of 8 khz, if you use its data at 16 khz sample rate then you obtain a 880 hz sound).
I suppose, however, you have to create different WAV files for the frequencies you intend to support.

Bernhard Hiller · Answer 2 · 2013-07-16T20:40:00

That's called "transposition" when e.g. a song originally played in C major is reproduced in E major. I haven't yet done that, but a similar problem is playback at different speed without affecting the pitch. An example for that can be found e.g. in Audacity (in C++ though). When you first change the speed, and afterwards change the header information for the sampling rate, you should arrive at the desired result.

Playing .wav file at frequencies from 20Hz-20,000Hz

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