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LC75010W Datenblatt(PDF) 10 Page - Sanyo Semicon Device

Teilenummer LC75010W
Bauteilbeschribung  LC75010W Car Audio DSP
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Hersteller  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

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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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