參數(shù)資料
型號(hào)： HD49235FS
廠商： Hitachi,Ltd.
元件分類： 數(shù)字信號(hào)處理
英文描述： Digital Signal Processor for CD
中文描述： 數(shù)字信號(hào)處理器的CD
文件頁(yè)數(shù)： 31/41頁(yè)
文件大小： 192K
代理商： HD49235FS
HD49235FS
Rev.2, Aug. 1995, page 31 of 41
2. Play Mode
This mode is automatically subdivided into a starting mode (rough servo control) and normal mode
(fine servo control) according to the rate at which sync signals are detected from the disc. The AINTV
and ATH bits in register C (CLV control) select an interval length and threshold value. Starting mode is
used if the number of sync signals in the selected interval is less than the threshold value. Normal mode
is used if the number exceeds the threshold value. Starting and normal modes operate as follows.
Starting Mode:
See table 2 for the outputs at the MON and MSTOP pins. The PWM pin outputs a
rectangular wave with a duty cycle corresponding to the arithmetic mean of the pulse width on the 11-T
low side and 11-T high side in the sync signal detected from the disc. See the PWM output duty cycle
characteristic in figure 18.
P
100
92.1
29.1
25.2
Fast rotation
0
–
4.6
–
2.3
–
0.300.85 2.3
4.6
6.9
9.2
Slow rotation
11T
Sync pattern
PWL
PWH
Gain:
–
6 dB
Gain: 0 dB
Gain: +6 dB
Center during play
Center of S-curve of starting servo
11T
–
1
2
PWL + PWH
×
100 [%]
83.5
79.5
74.8
70.9
66.9
64.6
58.3
54.3
45.7
41.7
39.4
33.1
Figure 18 Duty Cycle Characteristic of PWM Output (Speed Error) in CLV Starting Mode
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