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SM5921A Datenblatt(PDF) 10 Page - Nippon Precision Circuits Inc |
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SM5921A Datenblatt(HTML) 10 Page - Nippon Precision Circuits Inc |
10 / 27 page SM5921A SEIKO NPC CORPORATION —10 FUNCTIONAL DESCRIPTION Delay Settings The SM5921A sets the delay value set using an MCU interface and adds that delay to the input data. The total delay value for each channel data is given by the following equation. nSample-system: Number of system delay samples (fixed 2 samples) nSample-intrinsic: Number of intrinsic delay samples (16-sample units) nSample-individual: Number of individual delay samples (1-sample units) nMp: Address shift coefficient fs: Sampling frequency Note that even when the intrinsic delay and individual delay are both set to 0 samples, a 2-sample delay is applied. Address shift coefficient The address shift coefficient is determined by the settings of the MP0N and MP1N flags. These enable the time delay to be multiplied by ×1, ×2, or ×4 without changing the delay value setting. For example, if the sampling frequency fs is switched from 48kHz to 192kHz and the address shift is set to ×4, then the same delay time is added. I Data setting values cannot exceed the upper limit. I Calculation examples • If fs = 48kHz, REG 0/H = 200/H, REG 2/H = 800/H, nMp = 1, then the delay value is: tDelay = (nSample-system + (nSample-intrinsic + nSample-individual) × nMp) ÷ fs [sec] = (2 + (8192 + 2048) × 1) ÷ 48000 = 213.3ms • If fs = 192kHz, REG 0/H = 200/H, REG 2/H = 800/H, nMp = 1, then the delay value is: tDelay = (nSample-system + (nSample-intrinsic + nSample-individual) × nMp) ÷ fs [sec] = (2 + (8192 + 2048) × 1) ÷ 192000 = 53.3ms • If fs = 192kHz, REG 0/H = 200/H, REG 2/H = 800/H, nMp = 2, then the delay value is: tDelay = (nSample-system + (nSample-intrinsic + nSample-individual) × nMp) ÷ fs [sec] = (2 + (8192 + 2048) × 2) ÷ 192000 = 106.6ms • If fs = 192kHz, REG 0/H = 200/H, REG 2/H = 800/H, nMp = 4, then the delay value is: tDelay = (nSample-system + (nSample-intrinsic + nSample-individual) × nMp) ÷ fs [sec] = (2 + (8192 + 2048) × 4) ÷ 192000 = 213.3ms From the examples, it can be seen that switching the sampling frequency from 48kHz to 192kHz and changing nMp from 1 to 4 results in an identical time delay. Note, however, that the memory size physical limit cannot be exceeded. So, for example, the physical limit is reached with a sum (nSample-intrinsic + nSample-individ- ual) of 16384 samples when nMp = 4, or the equivalent of 65535 samples at nMp = 1. MP0N MP1N nMp LOW LOW 1 LOW HIGH 2 HIGH LOW 4 HIGH HIGH 1 t Delay sec () nSample-system nSample-intrinsic nSample-individual + () nMp × + () fs ------------------------------------------------------------------------------------------------------------------------------------------------------------------------- = |
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