Communications Blockset™

A-Law Compressor

Implement A-law compressor for source coding

Library

Source Coding

Description

The A-Law Compressor block implements an A-law compressor for the input signal. The formula for the A-law compressor is

where A is the A-law parameter of the compressor, V is the peak signal magnitude for x, log is the natural logarithm, and sgn is the signum function (sign in MATLAB^® software).

The most commonly used A value is 87.6.

The input can have any shape or frame status. This block processes each vector element independently.

Dialog Box

A value

The A-law parameter of the compressor.

Peak signal magnitude

The peak value of the input signal. This is also the peak value of the output signal.

Pair Block

A-Law Expander

See Also

Mu-Law Compressor

References

[1] Sklar, Bernard. Digital Communications: Fundamentals and Applications. Englewood Cliffs, N.J., Prentice-Hall, 1988.

Blocks — Alphabetical List

A-Law Expander