scipy.io.wavfile.write

scipy.io.wavfile.write(filename, rate, data)

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)