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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) 42 Page - Wolfson Microelectronics plc |
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WM8945ECS/R датащи(HTML) 42 Page - Wolfson Microelectronics plc |
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42 / 169 page  WM8945 Production Data w PD, May 2011, Rev 4.1 42 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R36 (24h) DRC Status 15:0 DRC_GAIN [15:0] DRC Gain value. This is the DRC gain, expressed as a voltage multiplier. Fixed point coding, MSB = 64. The first 7 bits are the integer portion; the remaining bits are the fractional part. Table 19 DRC Gain Readback DYNAMIC CHARACTERISTICS The dynamic behaviour determines how quickly the DRC responds to changing signal levels. Note that the DRC responds to the average (RMS) signal amplitude over a period of time. The DRC_ATK determines how quickly the DRC gain decreases when the signal amplitude is high. The DRC_DCY determines how quickly the DRC gain increases when the signal amplitude is low. These register fields are described in Table 20. Note that the register defaults are suitable for general purpose microphone use. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R31 (1Fh) DRC Control 3 7:4 DRC_ATK [3:0] 0100 Attack rate relative to input signal (seconds/6dB) 0000 = Reserved 0001 = 181us 0010 = 363us 0011 = 726us 0100 = 1.45ms 0101 = 2.9ms 0110 = 5.8ms 0111 = 11.6ms 1000 = 23.2ms 1001 = 46.4ms 1010 = 92.8ms 1011 = 185.6ms 1100-1111 = Reserved 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 |
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