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參數(shù)資料
| 型號(hào)： | CXD2597Q |
| 廠商： | Sony Corporation |
| 元件分類： | 數(shù)字信號(hào)處理 |
| 英文描述： | CD Digital Signal Processor with Built-in Digital Servo and DAC |
| 中文描述： | CD數(shù)字信號(hào)處理器，具有內(nèi)置數(shù)字伺服和DAC |
| 文件頁(yè)數(shù)： | 84/115頁(yè) |
| 文件大小： | 881K |
| 代理商： | CXD2597Q |
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CXD2597Q
§5-10. DFCT Countermeasure Circuit
The DFCT countermeasure circuit maintains the directionality of the servo so that the servo does not become
easily dislocated due to scratches or defects on discs.
Specifically, these operations are achieved by detecting scratch and defect with the DFCT signal generation
circuit, and when DFCT goes high, applying the low-frequency component of the error signal before DFCT
went high to the FCS and TRK servo filter inputs. (See Fig. 5-13.)
In addition, these operations are activated by the default. They can be disabled by setting D7 (DFSW) of $38
to 1.
Input register
Hold register
EN
Hold Filter
Servo Filter
Error signal
DFCT
Fig. 5-13.
§5-11. Anti-Shock Circuit
When vibrations occurs in the CD player, this circuit forces the TRK filter to switch to gain-up mode so that the
servo does not become easily dislocated. This circuit is for systems which require vibration countermeasures.
Concretely, vibrations are detected using an internal anti-shock filter and comparator circuit, and the gain is
increased. (See Fig. 5-14.)
The comparator level is fixed to 1/16 of the maximum comparator input amplitude. However, the comparator
level is practically variable by adjusting the value of the anti-shock filter output coefficient K35.
This function can be turned on and off by D19 of $1 when the brake circuit (described hereafter) is off. (See
Table 5-17.)
This circuit can also support an external vibration detection circuit, and can set the TRK servo filter to gain-up
mode by inputting high level to the ATSK pin.
When the upper 4 bits of the command register are 1 (Hex), vibration detection can be monitored from the
SENS pin. It also can be monitored from the ATSK pin by setting the ASOT command of $3F.
TE
Anti Shock
Filter
TRK Gain Up
Filter
TRK Gain Normal
Filter
TRK
PWM Gen
ATSK
SENS
Comparator
Fig. 5-14.
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