Signal Processing Blockset™

To Wave File - Write audio data to file in Microsoft Wave (.wav) format

Library

Signal Processing Sinks

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Description

The To Wave File block streams audio data to a Microsoft Wave (.wav) file in the uncompressed pulse code modulation (PCM) 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 with one or more channels. A signal with C channels is represented as a sample-based length-C vector or a frame-based M-by-C 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

Dialog Box

File name

Specify the path and name of the file to write. Paths can be relative or absolute. You do not need to specify the.wav extension.

Sample width (bits)

Specify the number of bits used to represent the signal samples in the file. The higher sample width settings require more memory but yield better fidelity for double- and single-precision inputs:

• 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

• 24 — Allocates 24 bits to each sample, allowing a resolution of 16777216 levels

• 32 — Allocates 32 bits to each sample, allowing a resolution of 2³² levels ranging from -1 to 1

The 8-, 16-, and 24-bit modes output integer data, while the 32-bit mode outputs single-precision floating-point data.

Minimum number of samples for each write to file

Specify the number of consecutive samples, L, to write with each file access. To reduce the required number of file accesses, the block writes L consecutive samples to the file during each access for . For , the block instead writes M consecutive samples during each access. Larger values of L result in fewer file accesses, which reduces run-time overhead.

Supported Data Types

See Also

To Wave Device (Obsolete)

Transpose