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LC75010W Datenblatt(PDF) 10 Page - Sanyo Semicon Device |
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LC75010W Datenblatt(HTML) 10 Page - Sanyo Semicon Device |
10 / 12 page No. N7349-10/12 LC75010W Notes on Filter Coefficient Settings (precision of calculations) The IIR filter calculations are performed using 24-bit coefficients, 24-bit delay functions, 24 × 24 = 48-bit multiplications, and 48 + 48 = 48-bit additions. For certain values of the filter coefficients, the precision can become inadequate during the process of the filter calculation. Such errors can result in switching noise occurring when changing between different steps in the volume control. *: This problem can occur when setting the second-order IIR with filter coefficients having low characteristic frequencies (for example, the cutoff frequency or the center frequency). For example, switching noise will occur if the coefficients for a high-pass filter with a cutoff frequency of 25 Hz and a Q of 0.7 are set with FixEQ.) The following workaround can be effective if switching noise occurs due to second-order IIR filter coefficient settings. • Increase the characteristic frequency without changing the second-order characteristics, for example, increase the cutoff frequency from 25 Hz to 100 Hz. • Use the second-order characteristics as the first-order characteristics and define the coefficients for first-order characteristics. CCB Address volume function data control data (8 bits) (24 bits) (24 bits) bit 0 7 8 31 32 55 LSB(B0, B1, … , A3, DI1, DI2, … … DI23, DI24, C1, C2, … … , C23, C24) MSB B0, B1, , A3, DI1, DI2, … CCB Address Coefficient data0 Coefficient data1 Coefficient address control data (8 bits) (24 bits) (24 bits) (24 bits) (16 bits) (8 bits) bit 0 7 8 31 32 55 56 150151 175176 191192 199 LSB( … … … … … … DI168, C1, C2, C23, C24 )MSB CCB Address CCB status Monitor data1 Monitor data2 (8 bits) (8 bits) (24 bits) (24 bits) bit0 7 8 15 16 39 40 63 LSB(B0, B1, , A3, S1, S2, S8, DO1, DO2, … … … … … , DO47, DO48 )MSB • Serial Input Data Format Examples Example 1: Data format for the volume function • Serial Output Data Format Example Example 1: CCB status register format (Total: 64 bits) Example 2: Data format for 24-bit coefficient data (Total: 200 bits maximum) |
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