GNU Radio Manual and C++ API Reference  3.8.1.0
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gr::filter::mmse_fir_interpolator_ff Class Reference

Compute intermediate samples between signal samples x(k*Ts) More...

#include <gnuradio/filter/mmse_fir_interpolator_ff.h>

Public Member Functions

 mmse_fir_interpolator_ff ()
 
 ~mmse_fir_interpolator_ff ()
 
unsigned ntaps () const
 
unsigned nsteps () const
 
float interpolate (const float input[], float mu) const
 compute a single interpolated output value. input must have ntaps() valid entries. input[0] .. input[ntaps() - 1] are referenced to compute the output value. More...
 

Protected Attributes

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

Detailed Description

Compute intermediate samples between signal samples x(k*Ts)

This implements a Minimum Mean Squared Error interpolator with 8 taps. It is suitable for signals where the bandwidth of interest B = 1/(4*Ts) Where Ts is the time between samples.

Although mu, the fractional delay, is specified as a float, it is actually quantized. 0.0 <= mu <= 1.0. That is, mu is quantized in the interpolate method to 32nd's of a sample.

For more information, in the GNU Radio source code, see:

  • gr-filter/lib/gen_interpolator_taps/README
  • gr-filter/lib/gen_interpolator_taps/praxis.txt

Constructor & Destructor Documentation

◆ mmse_fir_interpolator_ff()

gr::filter::mmse_fir_interpolator_ff::mmse_fir_interpolator_ff ( )

◆ ~mmse_fir_interpolator_ff()

gr::filter::mmse_fir_interpolator_ff::~mmse_fir_interpolator_ff ( )

Member Function Documentation

◆ interpolate()

float gr::filter::mmse_fir_interpolator_ff::interpolate ( const float  input[],
float  mu 
) const

compute a single interpolated 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.

Returns
the interpolated input value.

◆ nsteps()

unsigned gr::filter::mmse_fir_interpolator_ff::nsteps ( ) const

◆ ntaps()

unsigned gr::filter::mmse_fir_interpolator_ff::ntaps ( ) const

Member Data Documentation

◆ filters

std::vector<kernel::fir_filter_fff*> gr::filter::mmse_fir_interpolator_ff::filters
protected

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