How to play a fixed frequency sound using Python [closed]

Question

I have tried a number of ways of playing a fixed frequency sound (e.g. 1000Hz) and nothing works.

I have downloaded "beep" and that makes no noise.

I tried interfacing to pyao, and that had no effect.

I tried interfacing to audiere, and get a runtime error indicating the library could not be found, despite installing it from the software centre.

Any guidance for installation of appropriate libraries and relevant code would be most appreciated.

I cannot generate .mp3/ .wav files for this, but need to generate the tones at run time.

Many thanks for you

Answer 1

import math
#sudo apt-get install python-pyaudio
from pyaudio import PyAudio

#See http://en.wikipedia.org/wiki/Bit_rate#Audio
BITRATE = 16000 #number of frames per second/frameset.      

#See http://www.phy.mtu.edu/~suits/notefreqs.html
FREQUENCY = 261.63 #Hz, waves per second, 261.63=C4-note.
LENGTH = 1.2232 #seconds to play sound

NUMBEROFFRAMES = int(BITRATE * LENGTH)
RESTFRAMES = NUMBEROFFRAMES % BITRATE
WAVEDATA = ''    

for x in xrange(NUMBEROFFRAMES):
   WAVEDATA += chr(int(math.sin(x / ((BITRATE / FREQUENCY) / math.pi)) * 127 + 128))    

#fill remainder of frameset with silence
for x in xrange(RESTFRAMES): 
    WAVEDATA += chr(128)

p = PyAudio()
stream = p.open(
    format=p.get_format_from_width(1),
    channels=1,
    rate=BITRATE,
    output=True,
    )
stream.write(WAVEDATA)
stream.stop_stream()
stream.close()
p.terminate()

Answer 2

You can do that with python-pyaudio (available at least in 12.04):

from __future__ import division #Avoid division problems in Python 2
import math
import pyaudio
import sys

PyAudio = pyaudio.PyAudio
RATE = 16000
WAVE = 1000
data = ''.join([chr(int(math.sin(x/((RATE/WAVE)/math.pi))*127+128)) for x in xrange(RATE)])
p = PyAudio()

stream = p.open(format =
                p.get_format_from_width(1),
                channels = 1,
                rate = RATE,
                output = True)
for DISCARD in xrange(5):
    stream.write(data)
stream.stop_stream()
stream.close()
p.terminate()