Low Pass Filter low_pass_filter from gnuradio import gr from gnuradio.gr import firdes gr.$(type)(#if str($type).startswith('interp') then $interp else $decim#, firdes.low_pass( $gain, $samp_rate, $cutoff_freq, $width, $win, $beta)) set_taps(firdes.low_pass($gain, $samp_rate, $cutoff_freq, $width, $win, $beta)) FIR Type type enum Complex->Complex (Decimating) fir_filter_ccf input:complex output:complex Complex->Complex (Interpolating) interp_fir_filter_ccf input:complex output:complex Float->Float (Decimating) fir_filter_fff input:float output:float Float->Float (Interpolating) interp_fir_filter_fff input:float output:float Decimation decim 1 int #if str($type).startswith('interp') then 'all' else 'none'# Interpolation interp 1 int #if str($type).startswith('interp') then 'none' else 'all'# Gain gain 1 real Sample Rate samp_rate samp_rate real Cutoff Freq cutoff_freq real Transition Width width real Window win firdes.WIN_HAMMING int Hamming firdes.WIN_HAMMING Hann firdes.WIN_HANN Blackman firdes.WIN_BLACKMAN Rectangular firdes.WIN_RECTANGULAR Kaiser firdes.WIN_KAISER Beta beta 6.76 real in $type.input out $type.output This filter is a convenience wrapper for an fir filter and a firdes taps generating function. Sample rate, cutoff frequency, and transition width are in Hertz. The beta paramater only applies to the Kaiser window.