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Open Music Labs Forums • View topic - Saving the Spectrum of an Audio Signal, FFT Example

Saving the Spectrum of an Audio Signal, FFT Example

Saving the Spectrum of an Audio Signal, FFT Example

Postby lore52 » Mon Jan 21, 2013 3:11 pm

Hello,

I am a novice and I am trying to save the spectrum of a signal after running the FFT example code. I have sent an audio signal from my computer's headphone jack to line_in jack of the Audio Codec Shield using a male-male audio cable.

Then I opened the serial monitor and set the appropriate baud rate. I saw some characters flashing across the window and after a while the IDE froze.

Is there a method that I can implement to save the data in a human-readable format? I tried to use Processing and the Graph example given here

I will appreciate it if someone can point me to the right direction. Thanks in advance.
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Re: Saving the Spectrum of an Audio Signal, FFT Example

Postby guest » Tue Jan 22, 2013 1:18 am

it might be that too much data is coming in too fast for the computer to handle it, and then it overflows the buffer on the ide. try putting a delay(100) after you call the fft_run() function. the data will probably also not be in a human readable form, so you can try using serial.println() instead of the serial.write() that the example code uses.
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Re: Saving the Spectrum of an Audio Signal, FFT Example

Postby guest » Wed Jan 23, 2013 12:36 am

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