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WM8904 Datasheet(PDF) 54 Page - Wolfson Microelectronics plc |
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WM8904 Datasheet(HTML) 54 Page - Wolfson Microelectronics plc |
54 / 188 page WM8904 Pre-Production w PP, Rev 3.3, September 2012 54 The “knee” in Figure 29 is represented by register fields DRC_KNEE_IP and DRC_KNEE_OP. Parameter Y0, the output level for a 0dB input, is not specified directly, but can be calculated from the other parameters, using the equation The DRC Compression parameters are defined in Table 16. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R43 (2Bh) DRC Control 3 10:5 DRC_KNEE_IP [5:0] 00_0000 Input signal at the Compressor 'knee'. 000000 = 0dB 000001 = -0.75dB 000010 = -1.5dB … (-0.75dB steps) 111100 = -45dB 111101 to 111111 = Reserved 4:0 DRC_KNEE_OP [4:0] 0_0000 Output signal at the Compressor 'knee'. 00000 = 0dB 00001 = -0.75dB 00010 = -1.5dB … (-0.75dB steps) 11110 = -22.5dB 11111 = Reserved R42 (2Ah) DRC Control 2 5:3 DRC_HI_COMP [2:0] 000 Compressor slope (upper region) 000 = 1 (no compression) 001 = 1/2 010 = 1/4 011 = 1/8 100 = 1/16 101 = 0 110 to 111 = Reserved 2:0 DRC_LO_COMP [2:0] 000 Compressor slope (lower region) 000 = 1 (no compression) 001 = 1/2 010 = 1/4 011 = 1/8 100 = 0 101 to 111 = Reserved Table 16 DRC Compression Control |
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