SciPy

scipy.io.wavfile.write

scipy.io.wavfile.write(filename, rate, data)[source]

Write a numpy array as a WAV file.

Parameters
filenamestring or open file handle

Output wav file.

rateint

The sample rate (in samples/sec).

datandarray

A 1-D or 2-D numpy array of either integer or float data-type.

Notes

  • Writes a simple uncompressed WAV file.

  • To write multiple-channels, use a 2-D array of shape (Nsamples, Nchannels).

  • The bits-per-sample and PCM/float will be determined by the data-type.

Common data types: [1]

WAV format

Min

Max

NumPy dtype

32-bit floating-point

-1.0

+1.0

float32

32-bit PCM

-2147483648

+2147483647

int32

16-bit PCM

-32768

+32767

int16

8-bit PCM

0

255

uint8

Note that 8-bit PCM is unsigned.

References

1

IBM Corporation and Microsoft Corporation, “Multimedia Programming Interface and Data Specifications 1.0”, section “Data Format of the Samples”, August 1991 http://www.tactilemedia.com/info/MCI_Control_Info.html

Examples

Create a 100Hz sine wave, sampled at 44100Hz. Write to 16-bit PCM, Mono.

>>> from scipy.io.wavfile import write
>>> samplerate = 44100; fs = 100
>>> t = np.linspace(0., 1., samplerate)
>>> amplitude = np.iinfo(np.int16).max
>>> data = amplitude * np.sin(2. * np.pi * fs * t)
>>> write("example.wav", samplerate, data)

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