dsplib::Channelizer Class Reference

Polyphase FFT analysis filter bank. More...

#include <subband.h>

Public Member Functions
	Channelizer (const Channelizer &)=delete
	Channelizer (span_real filter, int num_bands, int decim_factor)
	Construct Channelizer.
	Channelizer (std::shared_ptr< const arr_real > filter, int num_bands, int decim_factor)
	Construct Channelizer.
	Channelizer (int num_bands, int decim_factor, int num_taps)
	Construct Channelizer.
arr_cmplx	process (span_real x)
	Filter bank processing (analysis)
arr_cmplx	operator() (span_real x)
int	frame_len () const noexcept
	Processing frame size.

Detailed Description

Polyphase FFT analysis filter bank.

Separates a broadband input signal into multiple narrow subbands

See also

Matlab dsp.Channelizer

Todo:

Add Range parameter [OneSided, Twosided, Centered]

Constructor & Destructor Documentation

Channelizer() [1/3]

dsplib::Channelizer::Channelizer ( span_real  filter, int  num_bands, int  decim_factor  )

explicit

Construct Channelizer.

Parameters

filter	Multirate FIR coeffs [num_bands * ntaps]
num_bands	Number of frequency bands
decim_factor	Decimation factor [1 : M-1]

Channelizer() [2/3]

dsplib::Channelizer::Channelizer ( std::shared_ptr< const arr_real >  filter, int  num_bands, int  decim_factor  )

explicit

Construct Channelizer.

Use this function to save memory if multiple Channelizer/ChannelSynthesizer objects can exist at the same time

Parameters

filter	Pointer to multirate FIR coeffs
num_bands	Number of frequency bands
decim_factor	Decimation factor [1 : M-1]

Channelizer() [3/3]

dsplib::Channelizer::Channelizer ( int  num_bands, int  decim_factor, int  num_taps  )

explicit

Construct Channelizer.

The filter will be calculated using the design_multirate_fir(1, num_bands, ceil(num_taps / 2.0))

Parameters

num_bands	Number of frequency bands
decim_factor	Decimation factor [1 : M-1]
num_taps	Number of filter coefficients per frequency band (expected to be even)

Member Function Documentation

frame_len()

int dsplib::Channelizer::frame_len ( ) const

noexcept

Processing frame size.

Returns

int frame len

process()

arr_cmplx dsplib::Channelizer::process

(

span_real

x

)

Filter bank processing (analysis)

Parameters

x	Input broadband signal [num_bands / decim_factor]

Returns

arr_cmplx Subband signal [num_bands]

---

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

• /home/runner/work/dsplib/dsplib/include/dsplib/subband.h