python 播放声音_Python库用于播放固定频率声音

I have a mosquito problem in my house. This wouldn't usually concern a programmers' community; However, I've seen some devices that claim to deter these nasty creatures by playing a 17Khz tone. I would like to do this using my laptop.

One method would be creating an MP3 with a a single, fixed-frequency tone (This can easily done by audacity), opening it with a python library and playing it repeatedly.

The second would be playing a sound using the computer built-in speaker. I'm looking for something similar to QBasic Sound:

SOUND 17000, 100

Is there a python library for that?

解决方案

PyAudiere is a simple cross-platform solution for the problem:

>>> import audiere

>>> d = audiere.open_device()

>>> t = d.create_tone(17000) # 17 KHz

>>> t.play() # non-blocking call

>>> import time

>>> time.sleep(5)

>>> t.stop()

pyaudiere.org is gone. The site and binary installers for Python 2 (debian, windows) are available via the wayback machine e.g., here's source code pyaudiere-0.2.tar.gz.

To support both Python 2 and 3 on Linux, Windows, OSX, pyaudio module could be used instead:

#!/usr/bin/env python

"""Play a fixed frequency sound."""

from __future__ import division

import math

from pyaudio import PyAudio # sudo apt-get install python{,3}-pyaudio

try:

from itertools import izip

except ImportError: # Python 3

izip = zip

xrange = range

def sine_tone(frequency, duration, volume=1, sample_rate=22050):

n_samples = int(sample_rate * duration)

restframes = n_samples % sample_rate

p = PyAudio()

stream = p.open(format=p.get_format_from_width(1), # 8bit

channels=1, # mono

rate=sample_rate,

output=True)

s = lambda t: volume * math.sin(2 * math.pi * frequency * t / sample_rate)

samples = (int(s(t) * 0x7f + 0x80) for t in xrange(n_samples))

for buf in izip(*[samples]*sample_rate): # write several samples at a time

stream.write(bytes(bytearray(buf)))

# fill remainder of frameset with silence

stream.write(b'\x80' * restframes)

stream.stop_stream()

stream.close()

p.terminate()

Example:

sine_tone(

# see http://www.phy.mtu.edu/~suits/notefreqs.html

frequency=440.00, # Hz, waves per second A4

duration=3.21, # seconds to play sound

volume=.01, # 0..1 how loud it is

# see http://en.wikipedia.org/wiki/Bit_rate#Audio

sample_rate=22050 # number of samples per second

)

It is a modified (to support Python 3) version of this AskUbuntu answer.