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WM8944BECS/R 数据表(PDF) 71 Page - Cirrus Logic

部件名 WM8944BECS/R
功能描述  Mono Low-Power CODEC with Video Buffer
PDF  165 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  CIRRUS [Cirrus Logic]
网页  http://www.cirrus.com
标志 CIRRUS - Cirrus Logic

WM8944BECS/R 数据表(HTML) 71 Page - Cirrus Logic

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WM8944B
Rev 4.3
71
Companding uses a piecewise linear approximation of the following equations (as set out by ITU-T
G.711 standard) for data compression:
-law (where =255 for the U.S. and Japan):
F(x) = ln( 1 +
|x|) / ln( 1 + )
} for -
1 ≤ x ≤ 1
A-law (where A=87.6 for Europe):
F(x) = A|x| / ( 1 + lnA)
 for x ≤ 1/A
F(x) = ( 1 + lnA|x|) / (1 + lnA)
 for 1/A ≤ x ≤ 1
u-law Companding
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Normalised Input
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Figure 27 µ-Law Companding
A-law Companding
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Figure 28 A-Law Companding



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