ZHCSAC2C August 2012 – October 2018 PCM5121 , PCM5122
PRODUCTION DATA.
Dynamic range compression (DRC) improves the overall listening experience. Typical music signals are characterized by crest factors (the ratio of peak signal power to average signal power) of 12 dB or more. To avoid audible distortion due to clipping of peak signals, the gain of the DAC channel must be adjusted so as not to cause hard clipping. As a result, the low applied gain during nominal periods causes the perception that the signal is not loud enough. To overcome this problem, the DRC in the PCM512x continuously monitors the output of the DAC Digital Volume control to detect its power level with respect to 0-dB full-scale. When the power level is low, the DRC increases the input signal gain to make it sound louder, and reduces the gain during peaks to avoid hard clipping. The DRC enables louder audio during nominal periods with a clearer, more pleasant listening experience.
The 3-band DRC function applies DRC to 3 different mono/stereo signals with 3 different time constants. The same DRC curve is applied on all the signals, enabling a multi-band DRC solution. The underlying DRC algorithm is the same as that available with the DRC component in PurePath Studio. In this instance, the DRC gain acts on each signal in time-multiplexed order, for example, 1-2-3, 1-2-3, 1-2-3.
| COEFFICIENT | REGISTER |
|---|---|
| DRC_MB_1_DRC_1_DRCAE | C70 (Pg 46, Reg 48, 49, 50, 51) |
| DRC_MB_1_DRC_1_DRC1AE | C71 (Pg 46, Reg 52, 53, 54, 55) |
| DRC_MB_1_DRC_1_DRCAA | C72 (Pg 46, Reg 56, 57, 58, 59) |
| DRC_MB_1_DRC_1_DRC1AA | C73 (Pg 46, Reg 60, 61, 62, 63) |
| DRC_MB_1_DRC_1_DRCAD | C74 (Pg 46, Reg 64, 65, 66, 67) |
| DRC_MB_1_DRC_1_DRC1AD | C75 (Pg 46, Reg 68, 69, 70, 71) |
| DRC_MB_1_DRC_2_DRCAE | C76 (Pg 46, Reg 72, 73, 74, 75) |
| DRC_MB_1_DRC_2_DRC1AE | C77 (Pg 46, Reg 76, 77, 78, 79) |
| DRC_MB_1_DRC_2_DRCAA | C78 (Pg 46, Reg 80, 81, 82, 83) |
| DRC_MB_1_DRC_2_DRC1AA | C79 (Pg 46, Reg 84, 85, 86, 87) |
| DRC_MB_1_DRC_2_DRCAD | C80 (Pg 46, Reg 88, 89, 90, 91) |
| DRC_MB_1_DRC_2_DRC1AD | C81 (Pg 46, Reg 92, 93, 94, 95) |
| DRC_MB_1_DRC_3_DRCAE | C82 (Pg 46, Reg 96, 97, 98, 99) |
| DRC_MB_1_DRC_3_DRC1AE | C83 (Pg 46, Reg 100, 101, 102, 103) |
| DRC_MB_1_DRC_3_DRCAA | C84 (Pg 46, Reg 104, 105, 106, 107) |
| DRC_MB_1_DRC_3_DRC1AA | C85 (Pg 46, Reg 108, 109, 119, 111) |
| DRC_MB_1_DRC_3_DRCAD | C86 (Pg 46, Reg 112, 113, 114, 115) |
| DRC_MB_1_DRC_3_DRC1AD | C87 (Pg 46, Reg 116, 117, 118, 119) |
| DRC_MB_1_DRC_DRCK0 | C88 (Pg 46, Reg 120, 121, 122, 123) |
| DRC_MB_1_DRC_DRCK1 | C89 (Pg 46, Reg 124, 125, 126, 127) |
| DRC_MB_1_DRC_DRCK2 | C90 (Pg 47, Reg 8, 9, 10, 11) |
| DRC_MB_1_DRC_DRCMT1 | C91 (Pg 47, Reg 12, 13, 14, 15) |
| DRC_MB_1_DRC_DRCMT2 | C92 (Pg 47, Reg 16, 17, 18, 19) |
| DRC_MB_1_DRC_DRCOFF1 | C93 (Pg 47, Reg 20, 21, 22, 23) |
| DRC_MB_1_DRC_DRCOFF2 | C94 (Pg 47, Reg 24, 25, 26, 27) |
| DRC_MB_1_MinusOne_Q22 | C95 (Pg 47, Reg 28, 29, 30, 31) |
| DRC_MB_1_MinusTwo_Q22 | C96 (Pg 47, Reg 32, 33, 34, 35) |
| DRC_MB_1_One_M2 | C97 (Pg 47, Reg 36, 37, 38, 39) |
| DRC_MB_1_Zero | C98 (Pg 47, Reg 40, 41, 42, 43) |
| DRC_MB_1_En_dB | C99 (Pg 47, Reg 44, 45, 46, 47) |
| DRC_MB_1_Minus__Zero_dB | C100 (Pg 47, Reg 48, 49, 50, 51) |
| DRC_MB_1_60_dB | C101 (Pg 47, Reg 52, 53, 54, 55) |
| DRC_MB_1_Minus_60_dB | C102 (Pg 47, Reg 56, 57, 58, 59) |
| DRC_MB_1_12_dB | C103 (Pg 47, Reg 60, 61, 62, 63) |
| DRC_MB_1_Offset | C104 (Pg 47, Reg 64, 65, 66, 67) |
| DRC_MB_1_K | C105 (Pg 47, Reg 68, 69, 70, 71) |
| DRC_MB_1_x / DRC_MB_1_DRC | C106 (Pg 47, Reg 72, 73, 74, 75) |
| DRC_MB_1_48_dB | C107 (Pg 47, Reg 76, 77, 78, 79) |
| DRC_MB_1_Minus_48_dB | C108 (Pg 47, Reg 80, 81, 82, 83) |
| DRC_MB_1_c1_3 | C109 (Pg 47, Reg 84, 85, 86, 87) |
| DRC_MB_1_c1_2 | C110 (Pg 47, Reg 88, 89, 90, 91) |
| DRC_MB_1_c1_1 | C111 (Pg 47, Reg 92, 93, 94, 95) |
| DRC_MB_1_c1_0 | C112 (Pg 47, Reg 96, 97, 98, 99) |
| DRC_MB_1_O1_1 | C113 (Pg 47, Reg 100, 101, 102, 103) |
| DRC_MB_1_S1_1 | C114 (Pg 47, Reg 104, 105, 106, 107) |
| DRC_MB_1_O1_2 | C115 (Pg 47, Reg 108, 109, 119, 111) |
| DRC_MB_1_S1_2 | C116 (Pg 47, Reg 112, 113, 114, 115) |
| DRC_MB_1_O1_3 | C117 (Pg 47, Reg 116, 117, 118, 119) |
| DRC_MB_1_S1_3 | C118 (Pg 47, Reg 120, 121, 122, 123) |
| DRC_MB_1_One_1_Q17 | C119 (Pg 47, Reg 124, 125, 126, 127) |
| DRC_MB_1_Scale1 | C120 (Pg 48, Reg 8, 9, 10, 11) |
| DRC_MB_1_x1Coeff | C121 (Pg 48, Reg 12, 13, 14, 15) |
| DRC_MB_1_c2_3 | C122 (Pg 48, Reg 16, 17, 18, 19) |
| DRC_MB_1_c2_2 | C123 (Pg 48, Reg 20, 21, 22, 23) |
| DRC_MB_1_c2_1 | C124 (Pg 48, Reg 24, 25, 26, 27) |
| DRC_MB_1_c2_0 | C125 (Pg 48, Reg 28, 29, 30, 31) |
| DRC_MB_1_O2_1 | C126 (Pg 48, Reg 32, 33, 34, 35) |
| DRC_MB_1_S2_1 | C127 (Pg 48, Reg 36, 37, 38, 39) |
| DRC_MB_1_O2_2 | C128 (Pg 48, Reg 40, 41, 42, 43) |
| DRC_MB_1_S2_2 | C129 (Pg 48, Reg 44, 45, 46, 47) |
| DRC_MB_1_O2_3 | C130 (Pg 48, Reg 48, 49, 50, 51) |
| DRC_MB_1_S2_3 | C131 (Pg 48, Reg 52, 53, 54, 55) |
| DRC_MB_1_One_2_Q17 | C132 (Pg 48, Reg 56, 57, 58, 59) |
| DRC_MB_1_Scale2 | C133 (Pg 48, Reg 60, 61, 62, 63) |
| DRC_MB_1_x2Coeff | C134 (Pg 48, Reg 64, 65, 66, 67) |
| DRC_MB_1_R1_1 | C135 (Pg 48, Reg 68, 69, 70, 71) |
| DRC_MB_1_R1_2 | C136 (Pg 48, Reg 72, 73, 74, 75) |
| DRC_MB_1_R2_1 | C137 (Pg 48, Reg 76, 77, 78, 79) |
| DRC_MB_1_R2_2 | C138 (Pg 48, Reg 80, 81, 82, 83) |
| DRC_MB_1_Band1_GainC | C139 (Pg 48, Reg 84, 85, 86, 87) |
| DRC_MB_1_Band2_GainC | C140 (Pg 48, Reg 88, 89, 90, 91) |
| DRC_MB_1_Band3_GainC | C141 (Pg 48, Reg 92, 93, 94, 95) |
| DRC_MB_1_MinusOne_M1 | C142 (Pg 48, Reg 96, 97, 98, 99) |
| DRC_MB_1_One_M1 | C143 (Pg 48, Reg 100, 101, 102, 103) |
| DRC_MB_1_Band1_GainE | C144 (Pg 48, Reg 104, 105, 106, 107) |
| DRC_MB_1_Band2_GainE | C145 (Pg 48, Reg 108, 109, 110, 111) |
| DRC_MB_1_Band3_GainE | C146 (Pg 48, Reg 112, 113, 114, 115) |
| DRC_MB_1_minus_One_M2 | C147 (Pg 48, Reg 116, 117, 118, 119) |