JPS6430074A - Rotary head type digital signal reproducing device - Google Patents
Rotary head type digital signal reproducing deviceInfo
- Publication number
- JPS6430074A JPS6430074A JP62183740A JP18374087A JPS6430074A JP S6430074 A JPS6430074 A JP S6430074A JP 62183740 A JP62183740 A JP 62183740A JP 18374087 A JP18374087 A JP 18374087A JP S6430074 A JPS6430074 A JP S6430074A
- Authority
- JP
- Japan
- Prior art keywords
- time
- frequency
- pll
- rapid searching
- digital signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
PURPOSE:To surely extract a clock even at the time of rapid searching and to improve data reading accuracy by constituting the titled device so that free run frequency approaches to frequency at the time of rapid searching and shortening a PLL leading time. CONSTITUTION:A frequency difference between a PLL clock and a system clock is detected every half rotation of a rotary drum 2 and a difference signal based on the frequency difference is applied to a PLL circuit at the time of the succeeding half rotation of the drum 2. The PLL leading time can be shortened by making the free run frequency approach to the frequency obtained at the time of rapid searching. Consequently, clocks can be surely extracted and the data reading accuracy can be improved at the time of rapid searching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62183740A JP2602238B2 (en) | 1987-07-24 | 1987-07-24 | Rotating head digital signal reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62183740A JP2602238B2 (en) | 1987-07-24 | 1987-07-24 | Rotating head digital signal reproducing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6430074A true JPS6430074A (en) | 1989-01-31 |
| JP2602238B2 JP2602238B2 (en) | 1997-04-23 |
Family
ID=16141146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62183740A Expired - Lifetime JP2602238B2 (en) | 1987-07-24 | 1987-07-24 | Rotating head digital signal reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2602238B2 (en) |
-
1987
- 1987-07-24 JP JP62183740A patent/JP2602238B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2602238B2 (en) | 1997-04-23 |
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