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scaled and unscaled FFT processors

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shan14

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Hi

What is mean by scaling of a Procesor??
while reading Theory of FFT processor I came across this line => "Divide by 2 scaling is performed at the output of each FFT Butterfly"

What is scaling??Why scaling is performed??
 

Scaling usually necessary to prevent overflow. If cpu doesn't have floating point coprocessor, math is done in Integer arithmetic, and for example, MAC operation (multiply accumulate) with 16-bits operand produces 33-bits result. So, to store it back you need to scale it by 17-bits.
 
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    shan14

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Hi

Thanks for your response
I have another doubt
1. 1D FFT is used in signal processing and 2D fft is used in Image processing , am I right??
 

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