JPS5564492A - Automatic phase control circuit - Google Patents
Automatic phase control circuitInfo
- Publication number
- JPS5564492A JPS5564492A JP13804178A JP13804178A JPS5564492A JP S5564492 A JPS5564492 A JP S5564492A JP 13804178 A JP13804178 A JP 13804178A JP 13804178 A JP13804178 A JP 13804178A JP S5564492 A JPS5564492 A JP S5564492A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- phase
- apc operation
- reference signal
- semistable
- 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
Abstract
PURPOSE: To prevent APC operation from reaching a semistable point by making a decision on whether a difference in phase between a reference signal and burst signal is within a fixed range and then by inverting a carrier in accordance with the result.
CONSTITUTION: From regenerated signals from head 9, chroma signal SC is extracted by BPF11 and frequency-modulated luminance signals through HPF10 are demodulated 12 and led to adder 13. In reproduction in a certain field period, switch 24 is closed to make phase comparison 19 between burst signal SB extracted from signal SC by gate 18 and reference signal SSC from oscillator 20 and on the basis of its output, APC operation is carried out. With this phase difference between 0°∼-180°, the phase of the reference signal to balanced modulator (BM)22 is inverted to invert the phase of the carrier signal to BM14, and consequently the phase distortion of signal SC is eliminated, so that the APC operation can be prevented from reaching a semistable point.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53138041A JPS6022866B2 (en) | 1978-11-09 | 1978-11-09 | Magnetic recording and reproducing device with automatic phase control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53138041A JPS6022866B2 (en) | 1978-11-09 | 1978-11-09 | Magnetic recording and reproducing device with automatic phase control circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5564492A true JPS5564492A (en) | 1980-05-15 |
JPS6022866B2 JPS6022866B2 (en) | 1985-06-04 |
Family
ID=15212631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53138041A Expired JPS6022866B2 (en) | 1978-11-09 | 1978-11-09 | Magnetic recording and reproducing device with automatic phase control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6022866B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2667265A1 (en) * | 2012-05-22 | 2013-11-27 | The Swatch Group Research and Development Ltd. | Brazed bi-metal timepiece external component |
-
1978
- 1978-11-09 JP JP53138041A patent/JPS6022866B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS6022866B2 (en) | 1985-06-04 |
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