<?xml version="1.0" encoding="ISO-8859-1"?> <example id="dial_tone_ex"><title>Dial Tone Output</title> <programlisting> #!/usr/bin/env python from gnuradio import gr from gnuradio import audio def build_graph (): sampling_freq = 48000 ampl = 0.1 fg = gr.flow_graph () src0 = gr.sig_source_f (sampling_freq, gr.GR_SIN_WAVE, 350, ampl) src1 = gr.sig_source_f (sampling_freq, gr.GR_SIN_WAVE, 440, ampl) dst = audio.sink (sampling_freq) fg.connect ((src0, 0), (dst, 0)) fg.connect ((src1, 0), (dst, 1)) return fg if __name__ == '__main__': fg = build_graph () fg.start () raw_input ('Press Enter to quit: ') fg.stop () </programlisting> </example>