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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8941 датащи(PDF) 67 Page - Wolfson Microelectronics plc |
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WM8941 датащи(HTML) 67 Page - Wolfson Microelectronics plc |
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67 / 96 page  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 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 39 u-Law Companding A-law Companding 0 20 40 60 80 100 120 0 0.2 0.4 0.6 0.8 1 Normalised Input 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Figure 40 A-Law Companding |
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