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Audio signal signed or std_logic_vector

Altera_Forum
Honored Contributor II
‎02-24-2009 09:12 PM
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hello  

 

i have already designed a digital voice recorder using the de2 the code that process the codec chip data is in the attachment  

 

i want now to feed the audio data to to an FFT megafunction  

my question is should the audio data be of signed data type or i keep it as it is ? do i have to do any scaling on the data before it goes to the fft ? 

 

thanks to any one who reply.
WM8731_audio_in_out.vhd
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Altera_Forum
Honored Contributor II
‎02-24-2009 11:22 PM
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The FFT data is interpreted as signed, but uses std_logic_vector port type, as other aritmetic Megafunctions. No scaling of FFT input required.

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