 |
|
|
|
|
|
 Title: |
US3873764:
Speed correction system for a video disk playback system
[ Derwent Title ]
|
| Country: |
US United States of America
|
| |
| Inventor: |
Boltz, Jr., Charles D.; Greenwood, IN
|
| Assignee: |
RCA Corporation, New York, NY
other patents from RCA CORPORATION (466175) (approx. 7,929)
News, Profiles, Stocks and More about this company
|
| Published / Filed: |
1975-03-25
/ 1973-10-05
|
| Application Number: |
US1973000403992
|
| IPC Code: |
Advanced:
G11B 3/10;
G11B 9/06;
G11B 19/20;
G11B 19/28;
G11B 21/03;
Core:
G11B 3/00;
G11B 9/00;
more...
IPC-7:
G11B 17/00;
G11B 19/28;
|
| ECLA Code: |
G11B21/03; G11B19/28;
|
| U.S. Class: |
Current:
386/087;
348/530;
360/073.03;
369/047.48;
369/277;
G9B/019.046;
G9B/021.007;
Original:
178/006.6R;
178/006.6R;
178/006.6DD;
178/006.6TC;
179/100.1S;
179/100.4E;
360/073;
|
| Field of Search: |
178/6.6 DD,6.6 TC,6.6 R,6.6 P
179/100.1 S,100.3 D,100.4 E
360/070,73
|
| Priority Number: |
|
| Abstract: |
In a video disc system for recovering recorded signals from a video disc by a stylus by establishing relative motion between the disc and the stylus, a speed correction system is provided. A low frequency error correction system is employed to maintain the average speed of the disc at a predetermined speed. A high frequency error correction system is used to compensate for the deviation of the instantaneous relative speed between the disc and the stylus from the average speed of the disc. Means responsive to the presence of recorded signals in the output of the stylus are provided for enabling the low frequency error correction system. Means are provided for delaying the operation of the high frequency error correction system relative to enabling of the low frequency error correction system, permitting stabilization of the high frequency error correction system response and adjustment of the average speed of the disc to the predetermined speed, to precede operation of the high frequency error correction system.
|
| Attorney, Agent or Firm: |
Whitacre, Eugene M. ;
Meagher, William H. ;
|
| Primary / Asst. Examiners: |
Konick, Bernard; Levy, Stewart
|
| INPADOC Legal Status: |
None
Family Legal Status Report
|
| Family: |
Show 24 known family members
|
First Claim:
Show all 11 claims |
What is claimed is:
1. In a disc playback system including an apparatus for recovering recorded signals from a spirally grooved disc record, said apparatus including a pickup device subject to positioning in the disc record groove for developing a recorded signal output, and means for rotating said disc record to establish relative motion between said disc record groove and said pickup device, wherein a predetermined speed of said relative motion is desired for proper operation of said apparatus, a speed correction system comprising:
- 1. first speed error correction means for adjusting the speed of rotation of said record to maintain the average speed of said relative motion at substantially the predetermined speed when the operation of said first speed error correction means is initiated;
- 2. second speed error correction means for supplementing the speed error correction afforded by said first speed error correction means, said second speed error correction means including:
- A. circuit means responsive to the signal output of said pickup device for developing an error signal representative of deviations of the instantaneous relative speed between said disc record groove and said pickup device from said predetermined speed; and
- B. transducer means, coupled to said circuit means and normally responsive to said error signal, for varying the position of said pickup device in relation to said disc record groove in a manner that opposes said deviations; and
3. means responsive to the presence of said recorded signals in the output of said pickup device for delaying the operation of said transducer means relative to initiation of said first speed error correction means operation, thereby permitting (a) adjustment of the average speed of said relative motion to substantially the predetermined speed, and (b) stabilization of said circuit means for developing an error signal, to precede the operation of said transducer means.
|
| Background / Summary: |
Show background / summary
|
| Drawing Descriptions: |
Show drawing descriptions
|
| Description: |
Show description
|
| Forward References: |
Show 6 U.S. patent(s) that reference this one
|
