The packed split-complex form of a real transform, for Pulp's own frequency-domain stages (the overlap-add ConvolverT). More...

#include <fft.hpp>

Static Public Member Functions
template<typename SampleType>
static void	forward (const FftT< SampleType > &fft, const SampleType input, SampleType re, SampleType *im, SampleType scale)
template<typename SampleType>
static void	inverse (const FftT< SampleType > &fft, const SampleType re, const SampleType im, SampleType *output, SampleType scale)

Detailed Description

The packed split-complex form of a real transform, for Pulp's own frequency-domain stages (the overlap-add ConvolverT).

re and im each hold size() / 2 values: re[0] is the DC bin and im[0] the Nyquist bin (both purely real), and re[k], im[k] for k = 1..N/2-1 are bin k, scaled as by forward_real_half(). It is the layout vDSP's real transform produces, so a stage that stays in it skips the interleave on the way in and out. Not public API: the partitioned engines keep interleaved bins, which their complex multiply-accumulate kernels run fastest on.

Member Function Documentation

◆ forward()

template<typename SampleType>

void pulp::signal::detail::FftRealSplit::forward	(	const FftT< SampleType > &	fft,
		const SampleType *	input,
		SampleType *	re,
		SampleType *	im,
		SampleType	scale )

inlinestatic

◆ inverse()