pythonでgnuradio その10

概要

pythonでgnuradioやってみた。
FM変調を録音した、wavファイルを読んで、FM復調を聞く。
信号は、440ｈｚのサイン波、搬送波は、16KHZ。

サンプルコード

from gnuradio import gr, blocks, analog
from gnuradio import audio
from gnuradio import filter

class my_top_block(gr.top_block):
    def __init__(self):
        gr.top_block.__init__(self)
        self.samp_rate = samp_rate = 32000
        self.hilbert_fc_0 = filter.hilbert_fc(65, filter.firdes.WIN_HAMMING, 6.76)
        self.dc_blocker_xx_0 = filter.dc_blocker_ff(32, True)
        self.blocks_wavfile_source_0 = blocks.wavfile_source('f5.wav', True)
        self.blocks_multiply_const_vxx_0 = blocks.multiply_const_vff((10, ))
        self.blocks_add_const_vxx_0 = blocks.add_const_vff((2, ))
        self.audio_sink_0 = audio.sink(samp_rate, '', True)
        self.analog_fm_demod_cf_0 = analog.fm_demod_cf(channel_rate = 32000, audio_decim = 1, deviation = 4000, audio_pass = 15000, audio_stop = 16000, gain = 1.0, tau = 75e-6, )
        self.connect((self.analog_fm_demod_cf_0, 0), (self.dc_blocker_xx_0, 0))
        self.connect((self.blocks_add_const_vxx_0, 0), (self.hilbert_fc_0, 0))
        self.connect((self.blocks_multiply_const_vxx_0, 0), (self.audio_sink_0, 0))
        self.connect((self.blocks_wavfile_source_0, 0), (self.blocks_add_const_vxx_0, 0))
        self.connect((self.dc_blocker_xx_0, 0), (self.blocks_multiply_const_vxx_0, 0))
        self.connect((self.hilbert_fc_0, 0), (self.analog_fm_demod_cf_0, 0))

if __name__ == '__main__':
    try:
        my_top_block().run()
    except KeyboardInterrupt:
        pass

以上。