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DIF starts with normal order input and generates bit reversed order output.
In contrast, DIT starts with bit reversed order input and generates normal order output.
the diff between the two lies in their very names - decimation is time and decimation in freq.
when u say decimation on time, u will consider the individual samples(actually pair of samples) in time domain n find their freq parts and go further and further to find the fft.
when u say decimation on freq, u will consider the individual samples in freq domain n combine them to come out with the actual fft.
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