gr::filter::mmse_interp_differentiator_ff Class Reference

Compute intermediate samples of the derivative of a signal between signal samples x(k*Ts) More...

#include <gnuradio/filter/mmse_interp_differentiator_ff.h>

Public Member Functions
	mmse_interp_differentiator_ff ()
	~mmse_interp_differentiator_ff ()
unsigned	ntaps () const
unsigned	nsteps () const
float	differentiate (const float input[], float mu) const
	compute a single interpolated differentiated output value. More...

Protected Attributes
std::vector< kernel::fir_filter_fff * >	filters

Detailed Description

Compute intermediate samples of the derivative of a signal between signal samples x(k*Ts)

This implements a Minimum Mean Squared Error interpolating differentiator with 8 taps. It is suitable for signals where the derivative of a signal has a bandwidth of interest in the range (-Fs/4, Fs/4), where Fs is the samples rate.

Although mu, the fractional delay, is specified as a float, in the range [0.0, 1.0], it is actually quantized. That is, mu is quantized in the differentiate method to 128th's of a sample.

Constructor & Destructor Documentation

gr::filter::mmse_interp_differentiator_ff::mmse_interp_differentiator_ff

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gr::filter::mmse_interp_differentiator_ff::~mmse_interp_differentiator_ff

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Member Function Documentation

float gr::filter::mmse_interp_differentiator_ff::differentiate	(	const float	input[],
		float	mu
	)		const

compute a single interpolated differentiated output value.

input must have ntaps() valid entries. input[0] .. input[ntaps() - 1] are referenced to compute the output value.

mu must be in the range [0, 1] and specifies the fractional delay.

Exceptions

std::runtime_error

if mu is not in the range [0, 1].

Returns

the interpolated differentiated output value.

unsigned gr::filter::mmse_interp_differentiator_ff::nsteps

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const

unsigned gr::filter::mmse_interp_differentiator_ff::ntaps

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const

Member Data Documentation

std::vector<kernel::fir_filter_fff *> gr::filter::mmse_interp_differentiator_ff::filters

protected

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The documentation for this class was generated from the following file:

• mmse_interp_differentiator_ff.h