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參數(shù)資料
| 型號： | HA12188AF |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Pre-Amplifier and Servo IC for Quadruple-Speed CD-ROM |
| 中文描述： | 預(yù)放大器和四人間伺服集成電路高速的CD - ROM |
| 文件頁數(shù)： | 19/35頁 |
| 文件大?。?/td> | 248K |
| 代理商： | HA12188AF |
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HA12188AF
Rev.1, Oct. 1995, page 19 of 35
5. Defect Detector
When a scratched disc is played, the EFM RF signal has the shape shown in figure 9 (a). The defect
detector detects the drop-out area of this signal. Scratches with dimensions of about 100
μ
m or greater are
detected.
(a) Pin 38
(b) Pin 20
Figure 9 Defect Detector Waveforms
6. Mirror Detector
As the pick-up travels across tracks, the EFM RF signal varies as in figure 10 (a). At pin 34, the signal
varies as in figure 10 (b). The mirror detector detects the mirror areas. The external capacitor on pin 33
integrates the track-crossing frequency component.
The internal time constant of the mirror detector can be set for normal, double, or quadruple speed by
microprocessor commands, to raise the trackable range of track-crossing frequencies.
(a) Pin 38
(b) Pin 34
(c) Mirror signal
(internal signal)
Figure 10 Mirror Detector Waveforms
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