User`s guide

To Wave File
5-449
5To Wave File
Purpose Write audio data to file in the Microsoft Wave (.wav) format (Windows only).
Library DSP Sinks
Description The To Wave File block writes audio data to a Microsoft Wave (.wav) file in the
uncompressed PCM (pulse code modulation) format. For compatibility reasons,
the sample rate of the discrete-time input signal should typically be one of the
standard Windows audio device rates (8000, 11025, 22050, or 44100 Hz),
although the block supports arbitrary rates.
The input to the block, u, can contain audio data from a mono or stereo signal.
A mono signal is represented as either a sample-based scalar or frame-based
length-M vector, while a stereo signal is represented as a sample-based
length-2 vector or frame-based M-by-2 matrix. The amplitude of the input
should be in the range ±1. Values outside this range are clipped to the nearest
allowable value.
wavwrite(u,Fs,bits,'filename') % Equivalent MATLAB code
The Sample Width (bits) parameter specifies the number of bits used to
represent the signal samples in the file. Two settings are available:
•
8 – allocates 8 bits to each sample, allowing a resolution of 256 levels
•
16 – allocates 16 bits to each sample, allowing a resolution of 65536 levels
The 16-bit sample width setting requires more memory but yields better
fidelity for double-precision inputs.
The
File name parameter can specify an absolute or relative path to the file.
You do not need to specify the
.wav extension. To reduce the required number
of file accesses, the block writes L consecutive samples to the file during each
access, where L is specified by the
Minimum number of samples for each
write to file
parameter (L ≥ M). For L < M, the block instead writes M
consecutive samples during each access. Larger values of L result in fewer file
accesses, which reduces run-time overhead.