Patent EP0388519A2 successfully refreshed from Google Patents.
EP0388519A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for setting the loop gain of servo loops in a disc player
Assignee: Pioneer Corp
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Filing: 1989-11-08
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Granted: —
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Expires: 2009-11-08
Abstract
Abstract A loop gain setting method automatically sets the loop gain of a focus servo loop and a tracking servo loop of a disc player for playing a disc. Firstly the loop gains of the focus servo loop and the tracking servo loop are set, and subsequently the appropriateness of the set values of loop gains is judged by comparing the set values of the loop gains with each other. According to another aspect of the present invention the loop gains of the focus servo loop and the tracking servo loop are set, and subsequently the appropriateness of the set values of loop gains is judged by comparing at least one of the set values of the loop gains with a sensed value of the amplitude of the envelope of an RF signal read-out from the disc.
Inventors
- 👤 Hidehiro Ishii
- 👤 Noriyoshi Takeya
- 👤 Chiharu Miura
- 👤 Tatsuya Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 07:52
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0941
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
93 words
A loop gain setting method for automatically setting the loop gain of a focus servo loop and a tracking servo loop of a disc player for playing a disc, the method comprising: a first step for setting the loop gain of the focus servo loop; a second step for setting the loop gain of the second servo loop; and a third step for determining the appropriateness of set values of the loop gains which have been set respectively in said first and second steps, by comparing said set values of the loop gains.
Claim 2
Dependent Claim
93 words
A loop gain setting method for automatically setting the loop gain of a focus servo loop and a tracking servo loop of a disc player for playing a disc, the method comprising: a first step for setting the loop gain of the focus servo loop; a second step for setting the loop gain of the second servo loop; and a third step for determining the appropriateness of set values of the loop gains which have been set respectively in said first and second steps, by comparing said set values of the loop gains.
Claim 3
Dependent Claim
45 words
The loop gain setting method of claim 1, further comprising a step for setting again at least one of said set values of the loop gains set in said first and second steps if a result of the determination in said third step is negative.
Claim 4
Dependent Claim
49 words
The loop gain setting method of claim 1, further comprising a step for replacing at least one of said set values of the loop gains set in said first and second steps by an initial setting value, if a result of the determination in said third step is negative.
Claim 5
Dependent Claim
128 words
A loop gain setting method for automatically setting the loop gain of a focus servo loop and a tracking servo loop of a disc player for playing a disc, the method comprising: a first step for setting the loop gain of the focus servo loop; a second step for setting the loop gain of the second servo loop; a third step for sensing the magnitude of an envelope of an RF signal read out from said disc; and a fourth step for determining the appropriateness of set values of the loop gains which have been set respectively in said first and second steps, by comparing at least one of said set values of the loop gains with a sensed value of the amplitude obtained in said third step.
Claim 6
Dependent Claim
128 words
A loop gain setting method for automatically setting the loop gain of a focus servo loop and a tracking servo loop of a disc player for playing a disc, the method comprising: a first step for setting the loop gain of the focus servo loop; a second step for setting the loop gain of the second servo loop; a third step for sensing the magnitude of an envelope of an RF signal read out from said disc; and a fourth step for determining the appropriateness of set values of the loop gains which have been set respectively in said first and second steps, by comparing at least one of said set values of the loop gains with a sensed value of the amplitude obtained in said third step.
Claim 7
Dependent Claim
45 words
The loop gain setting method of claim 4, further comprising a step for setting again at least one of said set values of the loop gains set in said first and second steps if a result of the determination in said fourth step is negative.
Claim 8
Dependent Claim
49 words
The loop gain setting method of claim 4, further comprising a step for replacing at least one of said set values of the loop gains set in said first and second steps by an initial setting value, if a result of the determination in said fourth step is negative.
References Cited (Backward Citations)
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