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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 development
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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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I, the copyright holder of this work, hereby publish it under the following license:
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 neighboring 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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2 May 2022

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current17:01, 2 May 2022Thumbnail for version as of 17:01, 2 May 2022810 × 810 (55 KB)MornUploaded own work with UploadWizard

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