WM8941GEFLSLASHV datasheet(67/96 Pages) WOLFSON

Part #	WM8941GEFL/V

Description	Mono CODEC with Speaker Driver and Video Buffer

PDF	96 Pages

Scroll/Zoom	100%

Manufacturer	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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67 / 96 page

Pre Production

WM8941

PP, Rev 3.3, December 2007

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

100

120

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

Normalised Input

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

Figure 39 u-Law Companding

A-law Companding

100

120

0.2

0.4

0.6

0.8

Normalised Input

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

Figure 40 A-Law Companding

WM8941GEFL/V Datasheet(PDF) 67 Page - Wolfson Microelectronics plc

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