* Function: R4FirstPass * * Description: radix-4 trivial pass for decimation-in-time FFT * * Inputs: buffer of (bit-reversed) samples * number of R4 butterflies per group (i.e. nfft / 4) * * Outputs: processed samples in same buffer * * Return: none * * Notes: assumes 2 guard bits, gains no integer bits, * guard bits out = guard bits i
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