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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8945ECS/R датащи(PDF) 69 Page - Wolfson Microelectronics plc |
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WM8945ECS/R датащи(HTML) 69 Page - Wolfson Microelectronics plc |
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69 / 169 page  Production Data WM8945 w PD, May 2011, Rev 4.1 69 Figure 27 DSP/PCM Mode Audio Interface (mode B, LRCLK_INV=0, Slave) COMPANDING The WM8945 supports A-law and -law companding on both transmit (ADC) and receive (DAC) sides as shown in Table 45. Companding converts 13 bits ( -law) or 12 bits (A-law) to 8 bits using non- linear quantization. This provides greater precision for low amplitude signals than for high amplitude signals, resulting in a greater usable dynamic range than 8 bit linear quantization. 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 45 Companding Control 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 Table 1 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 |
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