EP0026109A2
Expired / Lapsed
EP
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System for controlling recording and/or reproducing element in disc-shaped recording medium recording and/or reproducing apparatus
Assignee: Victor Company of Japan Ltd
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Filing: 1980-09-24
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Granted: —
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Expires: 2000-09-24
Abstract
Abstract The present invention provides a system for controlling a recording and/or reproducing element with respect to a recording medium, particularly disc shaped recording media. The control system comprises detection means (19, 31) for detecting the shift with respect to the regular position of the recording and/or reproducing element with respect to the recording element, control means for controlling the said element in accordance with the output of the detection means (19,31) and memory and arithmetic means (36) for storing the output of the detection means (19, 31) in a memory and supplying a signal from the memory, upon the introduction of an abnormality on the surface of the recording medium, to the control means. Preferably, storage in the memory is effected using a sampling pulse substantially synchronized with the rotation of the recording medium and the memory and arithmetic means (36) operates upon the output of the detection means (19,31) in comparison with that output an integral number of samples previously in order to determine an abnormal state.
Inventors
- 👤 Juichi Shikunami
- 👤 Yoshihiko Honjoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 13:24
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0948; G11B21/00; G11B21/16; G11B21/20; G11B7/0941
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
151 words
A control system in a recording and/or reproducing apparatus having an element for recording and/or reproducing a signal on and/or from a disc-shaped recording medium, characterized in that there are provided: detection means (19, 31) for detecting the shift with respect to the regular position of the relative position of said recording and/or reproducing element (13) with respect to said recording medium (14), control means (20,.22, 23, 24a, 24b) for controlling so as to set the relative position of said recording and/or reproducing element with respect to said recording meidum as the regular position according to the output detection error signal of said detection means; and memory and arithmetic operation means 936) for storing the output detection error signal of said detection means in a memory and supplying the error signal read from said memory upon introduction of an abnormality on the surface of said recording medium to said control means.
Claim 2
Dependent Claim
151 words
A control system in a recording and/or reproducing apparatus having an element for recording and/or reproducing a signal on and/or from a disc-shaped recording medium, characterized in that there are provided: detection means (19, 31) for detecting the shift with respect to the regular position of the relative position of said recording and/or reproducing element (13) with respect to said recording medium (14), control means (20,.22, 23, 24a, 24b) for controlling so as to set the relative position of said recording and/or reproducing element with respect to said recording meidum as the regular position according to the output detection error signal of said detection means; and memory and arithmetic operation means 936) for storing the output detection error signal of said detection means in a memory and supplying the error signal read from said memory upon introduction of an abnormality on the surface of said recording medium to said control means.
Claim 3
Dependent Claim
102 words
A control system as described in claim 1, characterized in that said memory and arithmetic operation menas (36) stores said error signal in said memory by using a sampling pulse substantially synchronized to the rotation of said recording medium, performs subtraction between an error signal at one particular point in time and that of M (M is an integer) samples before that particular point in time, performs judgement that the state is in an abnormal state when the resultant value from subtraction is larger than a predetermined value, and supplied the detection error signal read from said memory to said control means.
Claim 4
Dependent Claim
46 words
A control system as described in claim 2, characterized in that said memory and arithmetic operation means (36) supplies the detection error signal read from said memory of M ( M is an integer) samples before said particular point in time, upon judgement of said abnormal.state.
Claim 5
Dependent Claim
55 words
A control system as described in claim 2, characterized in that said memory and arithmetic operation means (36) supplies the detection error signal read from said memory of a point in time (P is an integer including unity) rotations of said recording medium before said particular point in time, upon judgement of said abnormal state.
Claim 6
Dependent Claim
63 words
A control system as described in claim 2 characterized in that said memory and arithmetic operation means (36) supplies the detection error signal read from said memory of N (N is an integer) samples before said point in time P (P is an integer including unity) rotations of said recording medium before said particular point in time, upon judgement of said abnormal states
Claim 7
Dependent Claim
73 words
A control system as described in claim 1, characterized in that said memory and arithmetic operation means (36) samples said error signal by using a sampling pulse substantailly synchronized to the rotation of said recording medium, averages the output detection signals at each sampling instants and points in time P (P is an integer including unity) rotations of said recording medium before said sampling instants, and stores said averaged value into said memory.
Claim 8
Dependent Claim
39 words
A control system as described in claim 1, characterized in that said memory and arithmetic operation means (36) does not store in said memory, the detection error signal at the point in time upon said judgement of abnormality state.
Claim 9
Dependent Claim
108 words
A control system as described in claim 1, characterized in that there is further provided changeover means (33) for selectively supplying the output detection error signal of said detection means and the detection error signal read from said memory by said memory and arithmetic operation means to said control means, said memory and arithmetic operation means supplying the detection error signal read from said memory by said memory and arithmetic operation means to said control means upon said abnormal state and at other instances applying a changeover control signal to said changeover means to supply the output detection error signal of said detection means to said control means.
Claim 10
Dependent Claim
58 words
A control system as described in claim 1, characterized in that there is further provided means (50) for mixing the output detection error signal of said detection means and the detection error signal read from said memory by said memory and arithmetic operation means with a preferable mixing ratio, and supplying said mixed signal to said control means.
Claim 11
Dependent Claim
46 words
A control system as described in claim 1, characterized in that said memory and arithmetic operation means (36) reads the detection error signal stored in said memory and supplies a signal ( ) (k is the improvement factor) times said read signal to said control means.
Claim 12
Dependent Claim
63 words
A control system as described in claim 2, characterized in that said information signal is a video signal including the horizontal synchronizing signal recorded on or reproduced from said recording medium, said recording medium is rotated at a rotational speed respective of the horizontal synchronizing signal frequency, and said sampling pulse frequency is selected at one-fifth the frequency of said horizontal synchronizing signal.
Claim 13
Dependent Claim
42 words
A control system as described in claim 1, characterized in that there is further provided means (21) for detecting the vibration of said recording and/or reproducing element, and that a signal corresponding to said detected vibration is supplied to said control means.
References Cited (Backward Citations)
No citation records indexed.
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