scaled and unscaled FFT processors

[shan14]

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??

 

[MagicianT]

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.

 

[shan14]

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??