CXD2585Q Datasheet, PDF (113/127 Pages) Sony Corporation – CD Digital Signal Processor with Built-in Digital Servo

CXD2585Q
• Input coefficient sign inversion when SFID = 1 and THID = 1
The preset coefficients for the TRK filter are negative for input and positive for output. With this, the
CXD2585Q outputs the servo drives which have the reversed phase to the error inputs..
Negative input coefficient
TE
K19
TRK Filter
Negative input coefficient
SE
K00
SLD Filter
TRK Hold
Positive input coefficient
K40
TRK Hold Filter
Positive output coefficient
∗
K22
Positive output coefficient
K05
Positive output coefficient
K45
When SFID = 1, the TRK filter negative input coefficient is applied to the SLD filter, so invert the SLD input
coefficient (K00) sign. (For example, inverting the sign for coefficient K00: E0Hex results in 60Hex.)
For the same reason, when THID = 1, invert the TRK hold input coefficient (K40) sign.
Negative input coefficient
Positive output coefficient
∗
TE
K19
TRK Filter
K22
MOD
Positive input coefficient
Positive output coefficient
SE
K00
SLD Filter
K05
TRK Hold
Negative input coefficient
K40
TRK Hold Filter
∗ _{for TRK servo gain normal}
See § 5-21. Filter Composition.
Positive output coefficient
K45
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