Decimating FIR Filter

This is GNU Radio's "normal" FIR Filter.

For a large number of taps, consider using an FFT Filter, see [1]

For standard filters such as lowpass, highpass, bandpass, etc., the filter.firdes and filter.optfir classes provide convenient generating methods.

Parameters

(R): Run-time adjustable

Decimation

Decimation rate. The output stream will have this decimation applied to it. A decimation rate of 1 simply means no decimation. If decimation is set higher than 1, make sure the filter will remove energy outside of the "output region", i.e. -Fs/2 to Fs/2 where Fs is the input sample rate divided by the decimation rate.

Taps (R)

Taps to use in FIR filter.

Sample Delay

Additional samples to delay by, default is 0 or no delay.

Example Flowgraph

This flowgraph implements a Broadcast FM stereo receiver using basic blocks.

Source Files

C++ files

fir_filter.cc

Public header files

[https://github.com/gnuradio/gnuradio/blob/main/gr-filter/include/gnuradio/filter/fir_filter.h fir_filter.h

Block definition

filter_fir_filter_xxx.block.yml