GSM Input Adaptor gsm_input import grgsm grgsm.gsm_input( ppm=$ppm, osr=$osr, fc=$fc, samp_rate_in=$samp_rate_in, ) set_ppm($ppm) set_osr($osr) set_fc($fc) set_samp_rate_in($samp_rate_in) ppm ppm ppm float part OSR osr osr int part fc fc fc float part samp_rate_in samp_rate_in samp_rate_in float part in complex 1 ctrl_in message True out complex 1 Piotr Krysik Adaptor of input stream for the GSM receiver. Contains frequency offset corrector and resampler to correct carrier frequency and sampling frequency offsets. At the end it has LP filter for filtering of a GSM channel.