# How to play a fixed frequency sound using Python

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

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

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You need to make WAVE a float. Why not call it FREQ? Also the equation is not right. Try this: math.sin((x*2*math.pi*FREQ)/RATE)*127)+128 – user216759 Nov 17 '13 at 20:46

``````import math
import pyaudio

#sudo apt-get install python-pyaudio
PyAudio = pyaudio.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 = WAVEDATA+chr(int(math.sin(x/((BITRATE/FREQUENCY)/math.pi))*127+128))

#fill remainder of frameset with silence
for x in xrange(RESTFRAMES):
WAVEDATA = 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()
``````
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it should be `(2*math.pi)` – J.F. Sebastian Oct 28 '14 at 15:29
I had to had future division and 2*math*pi to make it work correctly. Python 2.8 32 bit – chwi Nov 10 '15 at 10:26
Python 2.7 plays this as a "smooth" sound whereas Python 3.4 produces a much "buzzier" sound. Why? I tried adding the ____future____ division, but it made no difference. – Ubuntourist Dec 19 '15 at 20:29

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)
stream.write(data)
stream.stop_stream()
stream.close()
p.terminate()
``````
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Thank you for your help. – user98415 Oct 22 '12 at 10:43
Thank you for your help. Unfortunately, I get loads of errors when running, and making any changes to RATE or WAVE results in no sound. The errors are not listed due to a lack of space but refer to "ALSA lib". How would I change a) to eliminate errors and b) to change duration and frequency? Many thanks, – user98415 Oct 22 '12 at 10:52
I also get a bunch of error messages, but it plays just fine. Also, changing WAVE gives me different pitch. Are you using jack? Or just pulseaudio? – taneli Oct 23 '12 at 17:33
@user98415: add at the top `from __future__ import division` to avoid unnecessary truncation on Python 2. – J.F. Sebastian Oct 28 '14 at 15:05
@J.F.Sebastian That solved everything for me, thank you – chwi Nov 10 '15 at 10:02

import winsound winsound.beep(frequency,duration)

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@22 it will result on producing a beep sound

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`winsound` — Sound-playing interface for Windows – but Ubuntu isn't Windows. – David Foerster Apr 28 at 15:20