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<?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>
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