pythonでgnuradio その6

概要

pythonでgnuradioやってみた。
AM変調を録音。
信号は、440ｈｚのサイン波、搬送波は、5KHZ。

サンプルコード

from gnuradio import gr, blocks, analog

class my_top_block(gr.top_block):
    def __init__(self):
        gr.top_block.__init__(self)
        samp_rate = 32000
        self.blocks_wavfile_sink_0 = blocks.wavfile_sink('a2.wav', 1, samp_rate, 8)
        self.blocks_multiply_xx_0 = blocks.multiply_vcc(1)
        self.blocks_multiply_const_vxx_0 = blocks.multiply_const_vff((0.3, ))
        self.blocks_head_0 = blocks.head(gr.sizeof_gr_complex*1, 64000)
        self.blocks_complex_to_real_0 = blocks.complex_to_real(1)
        self.blocks_add_const_vxx_0 = blocks.add_const_vcc((1, ))
        self.analog_sig_source_x_1 = analog.sig_source_c(samp_rate, analog.GR_COS_WAVE, 5000, 1, 0)
        self.analog_sig_source_x_0 = analog.sig_source_c(samp_rate, analog.GR_COS_WAVE, 440, 1, 0)
        self.connect((self.analog_sig_source_x_0, 0), (self.blocks_add_const_vxx_0, 0))
        self.connect((self.analog_sig_source_x_1, 0), (self.blocks_multiply_xx_0, 1))
        self.connect((self.blocks_add_const_vxx_0, 0), (self.blocks_multiply_xx_0, 0))
        self.connect((self.blocks_complex_to_real_0, 0), (self.blocks_multiply_const_vxx_0, 0))
        self.connect((self.blocks_head_0, 0), (self.blocks_complex_to_real_0, 0))
        self.connect((self.blocks_multiply_const_vxx_0, 0), (self.blocks_wavfile_sink_0, 0))
        self.connect((self.blocks_multiply_xx_0, 0), (self.blocks_head_0, 0))

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

以上。