GNU Radio C++ API Reference g90d26cb
The Free & Open Software Radio Ecosystem
 
Loading...
Searching...
No Matches
gr::filter::mmse_fir_interpolator< sample_t > Class Template Reference

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

#include <gnuradio/filter/mmse_fir_interpolator.h>

Public Member Functions

 mmse_fir_interpolator ()
 
 mmse_fir_interpolator (mmse_fir_interpolator &&)=default
 
unsigned ntaps () const
 
unsigned nsteps () const
 
sample_t interpolate (const sample_t input[], float mu) const
 compute a single interpolated output value.
 

Protected Attributes

std::vector< kernel::fir_filter< sample_t, sample_t, float > > filters
 

Detailed Description

template<typename sample_t>
class gr::filter::mmse_fir_interpolator< sample_t >

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() [1/2]

template<typename sample_t >
gr::filter::mmse_fir_interpolator< sample_t >::mmse_fir_interpolator ( )

◆ mmse_fir_interpolator() [2/2]

template<typename sample_t >
gr::filter::mmse_fir_interpolator< sample_t >::mmse_fir_interpolator ( mmse_fir_interpolator< sample_t > && )
default

Member Function Documentation

◆ interpolate()

template<typename sample_t >
sample_t gr::filter::mmse_fir_interpolator< sample_t >::interpolate ( const sample_t input[],
float mu ) const

compute a single interpolated output value.

input must have ntaps() valid entries and be 8-byte aligned. input[0] .. input[ntaps() - 1] are referenced to compute the output value.

Exceptions
std::invalid_argumentif input is not 8-byte aligned.

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

Returns
the interpolated input value.

◆ nsteps()

template<typename sample_t >
unsigned gr::filter::mmse_fir_interpolator< sample_t >::nsteps ( ) const

◆ ntaps()

template<typename sample_t >
unsigned gr::filter::mmse_fir_interpolator< sample_t >::ntaps ( ) const

Member Data Documentation

◆ filters

template<typename sample_t >
std::vector<kernel::fir_filter<sample_t, sample_t, float> > gr::filter::mmse_fir_interpolator< sample_t >::filters
protected

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