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WM8941GEFL/V bảng dữ liệu(PDF) 67 Page - Wolfson Microelectronics plc

tên linh kiện WM8941GEFL/V
Giải thích chi tiết về linh kiện  Mono CODEC with Speaker Driver and Video Buffer
PDF  96 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
Trang chủ  http://www.wolfsonmicro.com
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WM8941GEFL/V bảng dữ liệu(HTML) 67 Page - Wolfson Microelectronics plc

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Pre Production
WM8941
w
PP, Rev 3.3, December 2007
67
Companding converts 13 bits (
µ-law) or 12 bits (A-law) to 8 bits using non-linear quantization. The
input data range is separated into 8 levels, allowing low amplitude signals better precision than that
of high amplitude signals. This is to exploit the operation of the human auditory system, where
louder sounds do not require as much resolution as quieter sounds. The companded signal is an 8-
bit word containing sign (1-bit), exponent (3-bits) and mantissa (4-bits).
BIT7
BIT[6:4]
BIT[3:0]
SIGN
EXPONENT
MANTISSA
Table 52 8-bit Companded Word Composition
u-law Companding
0
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120
0
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Normalised Input
0
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1
Figure 39 u-Law Companding
A-law Companding
0
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Normalised Input
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1
Figure 40 A-Law Companding



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