Patent US4479152A successfully refreshed from Google Patents.
US4479152A
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US
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Adjustable equalizer
Assignee: Unisys Corp
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Filing: 1982-04-22
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Granted: 1984-10-23
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Expires: 2002-04-22
Abstract
Abstract An automatically adjustable equalizer for modifying the spectral contour of digital, analog, and magnetically recorded signals. A temperature sensor-controlled switching circuit automatically adjusts the delay and forward gain parameters of the equalizer so as to optimize the equalization contour, in discrete ranges, over a wide range of temperatures, pressures or other physical processes or conditions.
Inventors
- 👤 Chao S. Chi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:43
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/027; G11B5/035
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
111 words
An equalizer for adjusting the spectral contour of a signal in response to an external stimulus comprising, delay means for delaying said signal by a time interval, thereby providing a delayed signal, impedance means for attenuating said signal by an attenuation amount, thereby providing an attenuated signal, differential means responsive to said delayed signal and said attenuated signal for providing an equalized signal whose spectral contour is a function of said time interval and said attenuation amount, and control means responsive to said stimulus for adjusting at least one of said time interval and said attenuation amount, thereby adjusting said spectral contour of said equalized signal in accordance with said stimulus.
Claim 2
Dependent Claim
111 words
An equalizer for adjusting the spectral contour of a signal in response to an external stimulus comprising, delay means for delaying said signal by a time interval, thereby providing a delayed signal, impedance means for attenuating said signal by an attenuation amount, thereby providing an attenuated signal, differential means responsive to said delayed signal and said attenuated signal for providing an equalized signal whose spectral contour is a function of said time interval and said attenuation amount, and control means responsive to said stimulus for adjusting at least one of said time interval and said attenuation amount, thereby adjusting said spectral contour of said equalized signal in accordance with said stimulus.
Claim 3
Dependent Claim
20 words
The equalizer of claim 1 wherein said delay means includes means for selectively providing a plurality of time delay intervals.
Claim 4
Dependent Claim
19 words
The equalizer of claim 1 wherein said impedance means includes means for selectively providing a plurality of attenuation amounts.
Claim 5
Dependent Claim
18 words
The equalizer of claim 2 wherein said control means includes means for selecting among said time delay intervals.
Claim 6
Dependent Claim
17 words
The equalizer of claim 3 wherein said control means includes means for selecting among said attenuation amounts.
Claim 7
Dependent Claim
34 words
The equalizer of claim 1 wherein said delay means includes means for selectively providing a plurality of time delay intervals and said impedance means includes means for selectively providing a plurality of attenuation amounts.
Claim 8
Dependent Claim
35 words
The equalizer of claim 6 further comprising delay control means responsive to said stimulus for selecting among said time delay intervals, and attenuation control means responsive to said stimulus for selecting among said attenuation amounts.
Claim 9
Dependent Claim
13 words
The equalizer of claim 1 wherein said control means includes temperature sensing means.
Claim 10
Dependent Claim
29 words
The equalizer of claim 1 wherein said control means comprises temperature sensing means for providing a binary signal indicating whether said temperature is above or below a predetermined temperature.
Claim 11
Dependent Claim
19 words
The equalizer of claim 9 wherein said control means comprises field effect switching means responsive to temperature sensing means.
Claim 12
Dependent Claim
57 words
An equalizer for adjusting the spectral contour of a signal derived from a disc recording system of the type utilizing a plurality of selectable concentric tracks of various radii including an inner track and an outer track according to claim 1, wherein said control means includes means for discriminating between said inner track and said outer track.
Claim 13
Dependent Claim
47 words
The equalizer of claim 11 wherein said means for discriminating comprises track radius sensing means for providing a binary signal representing the radius of each of said tracks and means for testing said binary signal to determine whether said radius is above or below a predetermined radius.
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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |