Using the python wave module directly seems to work; once you have
xnew as above you can do:
import wave
class SoundFile:
def __init__(self, signal,outname=''):
self.file = wave.open(outname, 'wb')
self.signal = signal
self.sr = 44100
def write(self):
self.file.setparams((1, 2, self.sr, 44100*4, 'NONE',
'noncompressed'))
self.file.writeframes(self.signal)
self.file.close()
x2str = ''.join(wave.struct.pack('h',x) for x in xnew)
f = SoundFile(x2str,outname='./noisyholanew.wav')
f.write()
...and that plays fine for me.
-Marshall Hampton
On Sep 20, 8:17 pm, Marshall Hampton <[email protected]> wrote:
> I think the scipy wavefile function doesn't like Sage ints. So if
> your last line is:
>
> wavfile.write("./noisyholanew.wav",int(44100), xnew)
>
> there are no errors, although when I try to play it (with a input wav
> of two sine waves) I don't hear anything.
>
> -M. Hampton
>
> On Sep 20, 10:37 am, j wade <[email protected]> wrote:
>
> > Hello,
>
> > I am attempting to create a .wav file from an array in sage using the
> > package wavfile. I am importing a .wav file using the package
> > wavfile, and then using the python wavelets package 'pywt' to create
> > the array. Here are the commands:
>
> > import pywt, scipy, numpy
> > from scipy.io import wavfile
> > x=wavfile.read('/directory/file.wav')
> > (cA, cD)=pywt.dwt(x[1],'db1')
> > xnew=pywt.idwt(cA,cD,'db1')
> > wavfile.write("noisyholanew.wav",44100, xnew)
>
> > The last command generates the following error message:
> > ------------------------------------------------------------------
> > Traceback (most recent call last):
> > File "<stdin>", line 1, in <module>
> > File "_sage_input_23.py", line 10, in <module>
> > exec compile(u'open("___code___.py","w").write("# -*- coding:
> > utf-8 -*-\\n" +
> > _support_.preparse_worksheet_cell(base64.b64decode("d2F2ZmlsZS53cml0ZSgibm9pc3lob2xhbmV3LndhdiIsNDQxMDAsIHhuZXcp"),globals())
> > +"\\n"); execfile(os.path.abspath("___code___.py"))
> > File "", line 1, in <module>
>
> > File "/tmp/tmpJPm6LZ/___code___.py", line 3, in <module>
> > exec
> > compile(u'wavfile.write("noisyholanew.wav",_sage_const_44100 , xnew)
> > File "", line 1, in <module>
>
> > File "/home/jeremy/Programs/sage-4.5.3/local/lib/python2.6/site-
> > packages/scipy/io/wavfile.py", line 99, in write
> > fid.write(struct.pack('ihHIIHH', 16, 1, noc, rate, sbytes, ba,
> > bits))
> > SystemError: Objects/longobject.c:336: bad argument to internal
> > function
>
> > noisyholanew.wav
> > -------------------------------------------------------------------
>
> > xnew is the array. type(xnew) returns <type 'numpy.ndarray'>.
>
> > When I run this series of commands in a python shell, I receive no
> > error, and a .wav file is generated.
>
> > I would like to be able to run this series of commands in sage as
> > well.
>
> > I am using Sage 4.5.3 (compiled from source) and Python 2.6.4 on
> > Ubuntu 9.10.
>
> > Thanks!
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