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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8948ECS/R датащи(PDF) 75 Page - Wolfson Microelectronics plc |
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WM8948ECS/R датащи(HTML) 75 Page - Wolfson Microelectronics plc |
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75 / 189 page  Production Data WM8948 w PD, May 2011, Rev 4.1 75 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R5 (05h) Companding control 3 DAC_COMP 0 DAC Companding Enable 0 = Disabled 1 = Enabled 2 DAC_COMP MODE 0 DAC Companding Mode 0 = μ-law 1 = A-law 1 ADC_COMP 0 ADC Companding Enable 0 = Disabled 1 = Enabled 0 ADC_COMP MODE 0 ADC Companding Mode 0 = μ-law 1 = A-law Table 46 Companding Control Companding uses a piecewise linear approximation of the following equations (as set out by ITU-T G.711 standard) for data compression: μ-law (where μ=255 for the U.S. and Japan): F(x) = ln( 1 + μ|x|) / ln( 1 + μ) } 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 0 20 40 60 80 100 120 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Normalised Input 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Figure 29 μ-Law Companding |
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