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SM5921AF Datasheet(PDF) 11 Page - Nippon Precision Circuits Inc |
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SM5921AF Datasheet(HTML) 11 Page - Nippon Precision Circuits Inc |
11 / 27 page SM5921A SEIKO NPC CORPORATION —11 Intrinsic delay The intrinsic delay is the common delay applied to each channel group, and is used to add the same delay value to the channel group data. The default value is 0 samples. The intrinsic delay is set by the values of REG 0/H (DIA/DOA and DIB/DOB groups) and REG 1/H (DIC/DOC and DID/DOD groups), with the values measured in 16-sample units (333.2 µs @ fs = 48kHz). When the TRACKT flag in REG A/H is set to HIGH, the same delay value is added to all the channel groups (DIA/DOA, DIB/DOB, DIC/DOC, DID/DOD). See the “MCU Interface” section. Individual delay The individual delay is the delay applied to each channel individually, and is used to add a delay offset for each channel data. The default value is 0 samples. The individual delay is set by the values of REG 2/H, REG 3/H, REG 4/H, REG 5/H, REG 6/H, REG 7/H, REG 8/H, and REG 9/H, with the values measured in 1-sample units (20.8 µs @ fs = 48kHz). When the TRACKD flag in REG A/H is set to HIGH, the delay value set in REG 2/H (DIA/DOA left-channel) is also applied to the DIA/DOA right-channel, DIB/DOB left-channel, and DIB/DOB right-channel data. Sim- ilarly, the delay value set in REG 6/H (DIC/DOC left-channel) is also applied to the DIC/DOC right-channel, DID/DOD left-channel, and DID/DOD right-channel data. The minimum parameter settings required to apply the same delay to all channels is to set delay values in REG 0/H, REG 2/H, REG 6/H, and to set the TRACKT and TRACKD flags to HIGH. The relationship between the intrinsic delay, individual delay, and the registers is shown in the following table. Delay time examples The total delay value is defined by the equation described earlier. The following table shows some examples. Channel Intrinsic delay Individual delay DIA/DOA left-channel REG 0/H REG 2/H DIA/DOA right-channel REG 3/H DIB/DOB left-channel REG 4/H DIB/DOB right-channel REG 5/H DIC/DOC left-channel REG 1/H REG 6/H DIC/DOC right-channel REG 7/H DID/DOD left-channel REG 8/H DID/DOD right-channel REG 9/H nSample-intrinsic + nSample-individual setting Sampling frequency (fs) Unit 32kHz 44.1kHz 48kHz 96kHz 192kHz 0*1 *1. Even when the set value is 0 samples, a fixed 2-sample system delay is applied. 62.5 45.4 41.7 20.8 10.4 µs 1000 31.3 22.7 20.8 10.4 5.2 ms 10000 312.5 226.8 208.3 104.2 52.1 ms 20000 625 453.5 416.7 208.3 104.2 ms 36863 1152 835.9 768 384 192 ms 65535 2048 1486.1 1365.3 682.7 341.3 ms |
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