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US3573667A
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Automatic equalizer adjustment apparatus
Assignee: AT&T Inc
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Filing: 1969-10-08
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Granted: 1971-04-06
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Expires: 1989-10-08
Abstract
Abstract An equalizer of a coaxial transmission system is automatically adjusted by applying a sweep signal to the equalizer and comparing the output of the equalizer with a predetermined reference signal to develop an error signal. The output signal of the equalizer is simultaneously converted into a plurality of weighting signals, each representing the energy content of the output signal within a passband which includes one equalizer transmission network characteristic, i.e., ''''bump.'''' Each weighting signal is multiplied by the error signal and integrated to develop a control signal for the associated equalizer transmission network.
Inventors
- 👤 Chih-Yu Kao
- 👤 Carl F Kurth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:50
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/14; H04B3/141
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
88 words
In a transmission system wherein an equalizer having a plurality of adjustable transmission networks is excited by an applied signal, the combination comprising: means for developing an Error signal corresponding to the difference between an output signal, developed by said equalizer, and a predetermined reference signal; means for developing a plurality of weighting signals; means responsive to said error signal for modifying the magnitude of each of said weighting signals; and and means for processing said modified weighting signals to develop control signals for said equalizer transmission networks.
Claim 2
Dependent Claim
88 words
In a transmission system wherein an equalizer having a plurality of adjustable transmission networks is excited by an applied signal, the combination comprising: means for developing an Error signal corresponding to the difference between an output signal, developed by said equalizer, and a predetermined reference signal; means for developing a plurality of weighting signals; means responsive to said error signal for modifying the magnitude of each of said weighting signals; and and means for processing said modified weighting signals to develop control signals for said equalizer transmission networks.
Claim 3
Dependent Claim
95 words
Apparatus for adjusting an equalizer, excited by a swept frequency signal, having a plurality of adjustable transmission networks comprising: means for developing an error signal corresponding to the difference between the signal developed by said equalizer and a predetermined reference signal; means for developing a plurality of weighting signals, each representing the energy content in predetermined passbands, of the signal transmitted by said equalizer; means for forming product signals of each of said weighting signals and said error signal; and and means for processing said product signals to develop control signals for said transmission networks.
Claim 4
Dependent Claim
95 words
Apparatus for adjusting an equalizer, excited by a swept frequency signal, having a plurality of adjustable transmission networks comprising: means for developing an error signal corresponding to the difference between the signal developed by said equalizer and a predetermined reference signal; means for developing a plurality of weighting signals, each representing the energy content in predetermined passbands, of the signal transmitted by said equalizer; means for forming product signals of each of said weighting signals and said error signal; and and means for processing said product signals to develop control signals for said transmission networks.
Claim 5
Dependent Claim
99 words
Automatic equalizer adjustment apparatus comprising: means for developing a swept frequency signal; equalizer means, having a plurality of adjustable transmission networks, responsive to said swept frequency signal for developing an output signal; means for developing an error signal corresponding to the difference between said output signal and a predetermined reference signal; means for developing a plurality of weighting signals, each representing the energy content of said output signal in predetermined passbands; means for forming product signals of each of said weighting signals and said error signal; and and means responsive to said product signals for adjusting said transmission networks.
Claim 6
Dependent Claim
99 words
Automatic equalizer adjustment apparatus comprising: means for developing a swept frequency signal; equalizer means, having a plurality of adjustable transmission networks, responsive to said swept frequency signal for developing an output signal; means for developing an error signal corresponding to the difference between said output signal and a predetermined reference signal; means for developing a plurality of weighting signals, each representing the energy content of said output signal in predetermined passbands; means for forming product signals of each of said weighting signals and said error signal; and and means responsive to said product signals for adjusting said transmission networks.
Claim 7
Dependent Claim
88 words
Automatic equalizer adjustment apparatus comprising: equalizer means having a plurality of adjustable transmission networks; means for applying a predetermined swept frequency signal to said equalizer means; means for developing an error signal corresponding to the difference between the signal developed by said equalizer means and a predetermined reference signal; means for developing a plurality of weighting signals; means for forming product signals of each of said weighting signals and said error signal; and and means for processing said product signals to develop control signals for said transmission networks.
Claim 8
Dependent Claim
88 words
Automatic equalizer adjustment apparatus comprising: equalizer means having a plurality of adjustable transmission networks; means for applying a predetermined swept frequency signal to said equalizer means; means for developing an error signal corresponding to the difference between the signal developed by said equalizer means and a predetermined reference signal; means for developing a plurality of weighting signals; means for forming product signals of each of said weighting signals and said error signal; and and means for processing said product signals to develop control signals for said transmission networks.
Claim 9
Dependent Claim
121 words
Automatic equalizer adjustment apparatus comprising: equalizer means having a plurality of adjustable band-pass transmission networks; means for applying a predetermined swept frequency signal to said equalizer means; means for developing an error signal corresponding to the difference between the signal transmitted by said equalizer means and a predetermined reference signal; means for developing a plurality of weighting signals, each representing the energy content of the signal transmitted by said equalizer means in predetermined passbands coextensive with the passbands of said adjustable networks; means for forming product signals of each of said weighting signals and said error signal; and and means for integrating each of said product signals to develop control signals for adjusting the transmission characteristics of said band-pass transmission networks.
Claim 10
Dependent Claim
121 words
Automatic equalizer adjustment apparatus comprising: equalizer means having a plurality of adjustable band-pass transmission networks; means for applying a predetermined swept frequency signal to said equalizer means; means for developing an error signal corresponding to the difference between the signal transmitted by said equalizer means and a predetermined reference signal; means for developing a plurality of weighting signals, each representing the energy content of the signal transmitted by said equalizer means in predetermined passbands coextensive with the passbands of said adjustable networks; means for forming product signals of each of said weighting signals and said error signal; and and means for integrating each of said product signals to develop control signals for adjusting the transmission characteristics of said band-pass transmission networks.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |