Claims
- 1. A video disc playback device comprising:
- a first processing system for reproducing and processing a video signal recorded on a disc;
- a second processing system for processing and superimposing an internal video signal on the video signal reproduced from the disc;
- timing window establishing means for establishing a timing window including an expected timing of a synchronizing signal of said first processing system;
- detection means for detecting the occurrence of said synchronizing signal in said window; and
- control means for controlling said second processing system to synchronize with said expected timing if the synchronizing signal of said first processing system has occurred in said window.
- 2. A device as defined in claim 1 further comprising:
- correction means for correcting said timing window when the synchronizing signal of said first processing system has occurred outside of said timing window within a predetermined length of time so that said timing window is shifted in a direction to include the timing of the synchronizing signal.
- 3. A device as defined in claim 2 further comprising:
- time base correcting means for correcting time base of the reproduced video signal of said first processing system each time a track-kick is performed; and
- time base reference changing means for compulsorily changing a time base reference of said second processing system each time said track-kick is performed.
- 4. A device as defined in claim 3 wherein said time base correcting means comprises:
- means for either advancing or delaying the entire reproduced video signal by a phase of 180 degrees of color burst for each track-kick.
- 5. A device as defined in claim 3 wherein said time base reference changing means comprises:
- means for either advancing or delaying said time base reference by a phase of 180 degrees of color burst for each track-kick.
Priority Claims (4)
Number |
Date |
Country |
Kind |
60-221784 |
Oct 1985 |
JPX |
|
60-221788 |
Oct 1985 |
JPX |
|
61-102653 |
May 1986 |
JPX |
|
61-131156 |
Jun 1986 |
JPX |
|
Parent Case Info
This is a continuation of copending application Ser. No. 915,071 filed on Oct. 3, 1986, now abandoned.
US Referenced Citations (16)
Foreign Referenced Citations (3)
Number |
Date |
Country |
3431946 |
Mar 1985 |
DEX |
1556611 |
Mar 1968 |
FRX |
2124056 |
Feb 1984 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
915071 |
Oct 1986 |
|