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WM8946 Datasheet(PDF) 45 Page - Wolfson Microelectronics plc |
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WM8946 Datasheet(HTML) 45 Page - Wolfson Microelectronics plc |
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45 / 175 page  Production Data WM8946 w PD, July 2012, Rev 4.3 45 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 3:0 DRC_DCY [3:0] 0010 Decay rate relative to input signal (seconds/6dB) 0000 = 186ms 0001 = 372ms 0010 = 743ms 0011 = 1.49s 0100 = 2.97s 0101 = 5.94s 0110 = 11.89s 0111 = 23.78s 1000 = 47.56s 1001-1111 = Reserved Table 20 DRC Time Constants Under the following conditions, it is possible to predict the attack times with an input sine wave: Decay rate is set at least 8 times the attack rate. Attack time * input frequency > 1 To estimate the attack time for 10%-90%: Attack Time = Register Value * 2.24 For example, if DRC_ATK = 1.45ms/6dB, then the attack time for 10%-90% = 1.45ms * 2.24 = 3.25ms. The decay time for 10%-90% can be estimated using the graph in Figure 19. Figure 19 Decay Time for 10%-90% vs Register Value Decay Rate |
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