On 25/07/15 12:15, Paul Z wrote:
Are there some way to generate a fixed frequency sound in different
> waves (eg. Sine Wave, Saw Wave, Triangle Wave etc.) and
> different random noise. (eg. white noise & pink noise) ?
While there are several options in Python (check out the
Activestate recipes) the simplest way on Linux may be to
create a file with the relevant signal and then play that
through aplay using the subprocess module.
One such module(by B Walker) that I found on Activestate
is this (slightly tweaked):
def sinebeep():
header=[ 82, 73, 70, 70, 100, 31, 0, 0, 87, 65, 86, 69,
102, 109, 116, 32, 16, 0, 0, 0, 1, 0, 1, 0,
64, 31, 0, 0, 64, 31, 0, 0, 1, 0, 8, 0, 100,
97, 116, 97, 64, 31, 0, 0 ]
waveform=[ 79, 45, 32, 45, 79, 113, 126, 113 ]
wavefile=open("beep.wav", "w+")
for hdr in header:
wavefile.write(chr(hdr))
for sample in range(0, 1000, 1):
for wf in waveform:
wavefile.write(chr(wf))
wavefile.close()
if __name__ == '__main__':
sinebeep()
You can then play the resultant file with
$ aplay beep.wav #you might need sudo
Its not very clever but you could create a series of beep
files each with a different frequency.
PS.
There is also a command line program called beep that does
what you want but it didn't work for me... YMMV
HTH
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos
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