pythonでgnuradio その23

概要

pythonでgnuradioやってみた。
練習問題やってみた。

練習問題

vocoderを使え。

サンプルコード

from gnuradio import gr
from gnuradio import audio
from gnuradio import blocks
from gnuradio import filter
from gnuradio import vocoder

def build_graph():
	sample_rate = 8000
	scale_factor = 32000
	tb = gr.top_block()
	src = audio.source(sample_rate)
	src_scale = blocks.multiply_const_ff(scale_factor)
	interp = filter.rational_resampler_fff(8, 1)
	f2s = blocks.float_to_short()
	enc = vocoder.cvsd_encode_sb()
	dec = vocoder.cvsd_decode_bs()
	s2f = blocks.short_to_float()
	decim = filter.rational_resampler_fff(1, 8)
	sink_scale = blocks.multiply_const_ff(1.0 / scale_factor)
	sink = audio.sink(sample_rate)
	tb.connect(src, src_scale, interp, f2s, enc)
	tb.connect(enc, dec, s2f, decim, sink_scale, sink)
	return tb

if __name__ == '__main__':
	tb = build_graph()
	tb.start()
	input('Press Enter to exit: ')
	tb.stop()
	tb.wait()

以上。