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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) 41 Page - Wolfson Microelectronics plc |
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WM8945ECS/R датащи(HTML) 41 Page - Wolfson Microelectronics plc |
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41 / 169 page  Production Data WM8945 w PD, May 2011, Rev 4.1 41 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R30 (1Eh) DRC Control 2 12:9 DRC_NG_ MINGAIN [3:0] 0110 Minimum gain the DRC can use to attenuate audio signals when the noise gate is active. 0000 = -36dB 0001 = -30dB 0010 = -24dB 0011 = -18dB 0100 = -12dB 0101 = -6dB 0110 = 0dB 0111 = 6dB 1000 = 12dB 1001 = 18dB 1010 = 24dB 1011 = 30dB 1100 = 36dB 1101 to 1111 = Reserved 4:2 DRC_MINGAIN [2:0] 001 Minimum gain the DRC can use to attenuate audio signals 000 = 0dB 001 = -12dB (default) 010 = -18dB 011 = -24dB 100 = -36dB 101 = Reserved 11X = Reserved 1:0 DRC_MAXGAIN [1:0] 01 Maximum gain the DRC can use to boost audio signals (dB) 00 = 12dB 01 = 18dB 10 = 24dB 11 = 36dB Table 18 DRC Gain Limits GAIN READBACK The gain applied by the DRC can be read from the DRC_GAIN register. This is a 16-bit, fixed-point value, which expresses the DRC gain as a voltage multiplier. DRC_GAIN is coded as a fixed-point quantity, with an MSB weighting of 64. The first 7 bits represent the integer portion; the remaining bits represent the fractional portion. If desired, the value of this field may be interpreted by treating DRC_GAIN as an integer value, and dividing the result by 512, as illustrated in the following examples: DRC_GAIN = 05D4 (hex) = 1380 (decimal) Divide by 512 gives 2.914 voltage gain, or 4.645dB DRC_GAIN = 0100 (hex) = 256 (decimal) Divide by 512 gives 0.5 voltage gain, or -3.01dB The DRC_GAIN register is defined in Table 19. |
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