參數(shù)資料
型號： CXD3011R-1
廠商： Sony Corporation
英文描述： Hook-Up Wire; Conductor Size AWG:26; No. Strands x Strand Size:7 x 34; Jacket Color:White/Yellow; Cable/Wire MIL SPEC:MIL-W-16878/1 Type B; Conductor Material:Copper; Jacket Material:Polyvinylchloride (PVC) RoHS Compliant: Yes
中文描述： CD數(shù)字信號處理器，具有內(nèi)置數(shù)字伺服和DAC
文件頁數(shù)： 119/160頁
文件大?。?/td> 1512K
代理商： CXD3011R-1
– 119 –
CXD3011R-1
§ 5-12. Brake Circuit
Immediately after a long distance track jump it tends to be hard for the actuator to settle and for the servo to
turn on.
The brake circuit prevents these phenomenon.
In principle, the brake circuit uses the tracking drive as a brake by cutting the unnecessary portions utilizing the
180° offset in the RF envelope and tracking error phase relationship which occurs when the actuator traverses
the track in the radial direction from the inner track to the outer track and vice versa. (See Figs. 5-15 and 5-16.)
Concretely, this operation is achieved by masking the tracking drive using the TRKCNCL signal generated by
loading the MIRR signal at the edge of the TZC (Tracking Zero Cross) signal.
The brake circuit can be turned on and off by D18 of $1. (See Fig. 5-17.)
In addition, the low frequency for the tracking drive after masking can be boosted. (SFBK1, 2 of $34B)
Inner track
→
Outer track
TRK
DRV
FWD
JMP
REV
RF
Trace
MIRR
TE
0
TZC
Edge
TRKCNCL
0
TRK DRV
(SFBK OFF)
SENS
TZC out
0
TRK DRV
(SFBK ON)
Outer track
→
Inner track
TRK
DRV
REV
JMP
JMPServo ON
RF
Trace
MIRR
TE
0
TZC
Edge
TRKCNCL
0
TRK DRV
(SFBK OFF)
SENS
TZC out
0
TRK DRV
(SFBK ON)
Fig. 5-15.
Fig. 5-16.
Register
name
Command
D23 to D20
D19 to D16
1 0
0
1
0
0
1
1
0
ANTI SHOCK ON
ANTI SHOCK OFF
BRAKE ON
BRAKE OFF
TRACKING GAIN NORMAL
TRACKING GAIN UP
TRACKING GAIN UP FILTER SELECT 1
TRACKING GAIN UP FILTER SELECT 2
0 0 0 1
TRACKING
CONTROL
1
Table 5-17.
: Don't care
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