US5600615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device and method for automatically controlling a servo loop gain
Assignee: Pioneer Corp
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Filing: 1994-11-02
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Granted: 1997-02-04
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Expires: 2014-11-02
Abstract
Abstract An automatic gain control device includes: servo loop for performing servo control based on an error signal; gain control unit for controlling gain of the servo loop in accordance with gain control value; and storage unit for storing gain control values. The gain control unit starts gain control using the gain control value stored in the storage unit as default value with which the gain control is started, and stores the gain control value newly obtained by the gain control to the storage unit after the gain control is completed.
Inventors
- 👤 Kazuhiro Kiyoura
- 👤 Yoshifumi Fujino
- 👤 Alex Bradshaw
- 👤 Takashi Sasaki
- 👤 Koichiro Haraguchi
- 👤 Takeshi Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:42
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0941
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
130 words
An automatic gain control device comprising: servo loop for performing servo control based on an error signal; gain control means for controlling a gain of the servo loop in accordance with a gain control value; and storage means for storing gain control values, wherein said gain control means starts gain control using the gain control value stored in the storage means as a default value with which the gain control is started, and stores a gain control value newly obtained by the gain control to the storage means after the gain control is completed, wherein the automatic gain control device further comprises means for calculating an average of the gain control values stored in the storage means, and wherein said gain control means uses the average as the default value.
Claim 2
Dependent Claim
130 words
An automatic gain control device comprising: servo loop for performing servo control based on an error signal; gain control means for controlling a gain of the servo loop in accordance with a gain control value; and storage means for storing gain control values, wherein said gain control means starts gain control using the gain control value stored in the storage means as a default value with which the gain control is started, and stores a gain control value newly obtained by the gain control to the storage means after the gain control is completed, wherein the automatic gain control device further comprises means for calculating an average of the gain control values stored in the storage means, and wherein said gain control means uses the average as the default value.
Claim 3
Dependent Claim
50 words
An automatic gain control device according to claim 1, further comprising a disturbance source for generating a disturbance signal and mixing the disturbance signal with the error signal; and gain detecting means for detecting the gain of the servo loop on the basis of a level of the disturbance signal.
Claim 4
Dependent Claim
30 words
An automatic gain control device according to claim 1, wherein said gain control means utilizes a gain control value most recently stored in the storage means as the default value.
Claim 5
Dependent Claim
30 words
An automatic gain control device according to claim 1, further comprising means for varying the default value when the servo loop is not closed by the default value initially used.
Claim 6
Dependent Claim
110 words
An automatic gain control device comprising: a servo loop for performing servo control based on an error signal; gain control means for controlling a gain of the servo loop in accordance with a gain control value; storage means for storing gain control values; and table storage means for storing correspondences between the gain control values and default values with which the gain control is started, wherein said gain control means starts gain control using a default value corresponding to the gain control value stored in the storage means, and stores a gain control value newly obtained by the gain control to the storage means after the gain control is completed.
Claim 7
Dependent Claim
110 words
An automatic gain control device comprising: a servo loop for performing servo control based on an error signal; gain control means for controlling a gain of the servo loop in accordance with a gain control value; storage means for storing gain control values; and table storage means for storing correspondences between the gain control values and default values with which the gain control is started, wherein said gain control means starts gain control using a default value corresponding to the gain control value stored in the storage means, and stores a gain control value newly obtained by the gain control to the storage means after the gain control is completed.
Claim 8
Dependent Claim
50 words
An automatic gain control device according to claim 6, further comprising a disturbance source for generating a disturbance signal and mixing the disturbance signal with the error signal; and gain detecting mean for detecting the gain of the servo loop on the basis of a level of the disturbance signal.
Claim 9
Dependent Claim
30 words
An automatic gain control device according to claim 5, further comprising means for varying the default value when the servo loop is not closed by the default value initially used.
Claim 10
Independent Claim
101 words
A device for automatically controlling a gain of a servo loop, comprising: a memory; and automatic gain control means for performing an automatic gain control operation by producing a new gain control value from a default gain control value stored in the memory, controlling the gain of the servo loop in accordance with the new gain control value, and storing the new gain control value in the memory, wherein the automatic gain control means uses the new gain control value as the default gain control value when repeating the automatic gain control operation to perform a subsequent automatic gain control operation.
Claim 11
Independent Claim
101 words
A device for automatically controlling a gain of a servo loop, comprising: a memory; and automatic gain control means for performing an automatic gain control operation by producing a new gain control value from a default gain control value stored in the memory, controlling the gain of the servo loop in accordance with the new gain control value, and storing the new gain control value in the memory, wherein the automatic gain control means uses the new gain control value as the default gain control value when repeating the automatic gain control operation to perform a subsequent automatic gain control operation.
Claim 12
Dependent Claim
68 words
The device according to claim 8, wherein the automatic gain control means comprises: a disturbance source for generating a disturbance signal; and gain detecting means for detecting a gain of the servo loop by comparing a level of the disturbance signal after the disturbance signal has traveled through the servo loop with a level of the disturbance signal before the disturbance signal has traveled through the servo loop.
Claim 13
Dependent Claim
96 words
The device according to claim 9, wherein the gain detecting means includes: a first gain detecting block for detecting the level of the disturbance signal after the disturbance signal has traveled through the servo loop; a second gain detecting block for detecting the level of the disturbance signal before the disturbance signal has traveled through the servo loop; and a micro-computer for comparing the level of the disturbance signal after the disturbance signal has traveled through the servo loop with the level of the disturbance signal before the disturbance signal has traveled through the servo loop.
Claim 14
Dependent Claim
29 words
The device according to claim 10, wherein each of the first and second gain detecting blocks includes a band-pass filter, an absolute value calculation circuit, and a low-pass filter.
Claim 15
Dependent Claim
98 words
The device according to claim 8, wherein the automatic gain control means performs the automatic gain control operation by producing a plurality of new gain control values from the default gain control value stored in the memory, controlling the gain of the servo loop in accordance with an average of the new gain control values, and storing the average of the new gain control values in the memory, and wherein the automatic gain control means uses the average of the new gain control values as the default gain control value when performing the subsequent automatic gain control operation.
Claim 16
Dependent Claim
59 words
The device according to claim 8, further comprising: servo loop detecting means for detecting whether the servo loop is open or closed upon completion of the automatic gain control operation by the automatic gain control means; and varying means for varying the default gain control value when the servo loop detecting means detects that the servo loop is open.
Claim 17
Dependent Claim
20 words
The device according to claim 13, wherein the varying means varies the default gain control value by a predetermined amount.
Claim 18
Independent Claim
91 words
A method for automatically controlling a gain of a servo loop, comprising the steps of: performing an automatic gain control operation by producing a new gain control value from a default gain control value stored in a memory, controlling the gain of the servo loop in accordance with the new gain control value, and storing the new gain control value in the memory; and using the new gain control value as the default gain control value when repeating the automatic gain control operation to perform a subsequent automatic gain control operation.
Claim 19
Independent Claim
91 words
A method for automatically controlling a gain of a servo loop, comprising the steps of: performing an automatic gain control operation by producing a new gain control value from a default gain control value stored in a memory, controlling the gain of the servo loop in accordance with the new gain control value, and storing the new gain control value in the memory; and using the new gain control value as the default gain control value when repeating the automatic gain control operation to perform a subsequent automatic gain control operation.
Claim 20
Dependent Claim
58 words
The method according to claim 15, further comprising the steps of: generating a disturbance signal; and detecting a gain of the servo loop by comparing a level of the disturbance signal after the disturbance signal has traveled through the servo loop with a level of the disturbance signal before the disturbance signal has traveled through the servo loop.
Claim 21
Dependent Claim
90 words
The method according to claim 15, wherein the automatic gain control operation is performed by producing a plurality of new gain control values from the default gain control value stored in the memory, controlling the gain of the servo loop in accordance with an average of the new gain control values, and storing the average of the new gain control values in the memory, and wherein the average of the new gain control values are used as the default gain control value when performing the subsequent automatic gain control operation.
Claim 22
Dependent Claim
44 words
The method according to claim 15, further comprising the steps of: detecting whether the servo loop is open or closed upon completion of the automatic gain control operation; and varying the default gain control value when the servo loop is detected to be open.
Claim 23
Dependent Claim
18 words
The method according to claim 18, wherein the default gain control value is varied by a predetermined amount.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-04 | 2000-08-05 | 2001-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-04 | 2004-08-05 | 2005-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-04 | 2008-08-05 | 2009-02-04 | $7700.00 | Window Closed / Lapsed |