File:Demo of mu-law compression.svg

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Summary

Description
English: Demo of mu-law compression: the input signal (top), a simple sine wave with a linearly increasing amplitude, is compressed in its dynamic range by μ-law (bottom).
Date
Source Own work
Author Morn
SVG genesis
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 This plot was created with Matplotlib
Source code
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Python code

Source code 
from pylab import *

def sgn(v):
    if v >= 0:
        return 1
    else:
        return -1

def ff(x):
    "Forward mu-law"
    return sgn(x) * log(1 + 255 * abs(x)) / log(256)

figure(figsize = (9, 9))

X = arange(0, 1.002, .002)
ORIG = [x * sin(12 * pi * x) for x in X]
MULAW = [ff(y) for y in ORIG]

subplot(211)
plot(X, ORIG)
title ("Original signal")
axis((0, 1, -1, 1))
grid()

subplot(212)
plot(X, MULAW)
title ("Compressed signal (μ-law)")
axis((0, 1, -1, 1))
grid()

savefig("mu-law-demo.svg")

show()

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Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighbouring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

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μ-law algorithm

inception

2 May 2022

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