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我在GNU Radio中製作了簡單的FM收音機，但聽不到清晰的聲音。它只是非常嘈雜，切碎的聲音。即使撥號音的例子也有同樣的問題。爲什麼我聽不到簡單GNURadio模塊的清晰聲音
有沒有人遇到同樣的問題？
我的環境：
- VM虛擬框（2核心，1GB顯存）
- 的Ubuntu 14.04.4 LTS
- GNU收音機3.7.9
撥號音例子（與官方網站中的原版相同）
#!/usr/bin/env python
#
# Copyright 2004,2005,2007 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from gnuradio import gr
from gnuradio import analog
from gnuradio import audio
from gnuradio.eng_option import eng_option
from optparse import OptionParser
class my_top_block(gr.top_block):
def __init__(self):
gr.top_block.__init__(self)
parser = OptionParser(option_class=eng_option)
parser.add_option("-O", "--audio-output", type="string", default="",
help="pcm output device name. E.g., hw:0,0 or /dev/dsp")
parser.add_option("-r", "--sample-rate", type="eng_float", default=48000,
help="set sample rate to RATE (48000)")
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
raise SystemExit, 1
sample_rate = int(options.sample_rate)
ampl = 1
src0 = analog.sig_source_f (sample_rate, analog.GR_SIN_WAVE, 350, ampl)
src1 = analog.sig_source_f (sample_rate, analog.GR_SIN_WAVE, 440, ampl)
dst = audio.sink (sample_rate, options.audio_output)
self.connect (src0, (dst, 0))
self.connect (src1, (dst, 1))
if __name__ == '__main__':
try:
my_top_block().run()
except KeyboardInterrupt:
pass