US3633129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic equalizer utilizing a predetermined reference signal
Assignee: AT&T Inc
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Filing: 1970-10-12
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Granted: 1972-01-04
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Expires: 1990-10-12
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 train of pulses and applied to a frequency selector which generates signals upon the occurrence of predetermined frequencies in the equalizer output signal. In response to these generated signals, predetermined intervals of the error signal are integrated, converted to digital signals, and applied to the proper ''''memory'''' of the equalizer.
Inventors
- 👤 Chih-Yu Kao
- 👤 Carl Ferdinand Kurth
- 👤 Roderick Campbell Maclean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:11
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/14; H04B3/141
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
96 words
Apparatus for adjusting an equalizer, excited by an applied signal, having a plurality of adjustable transmission networks 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 responsive to said output signal for developing a plurality of control signals representative of the effective frequency range of predetermined passbands of said equalizer; means responsive to said control signals for integrating said error signal; and means responsive to said control signals for selectively applying said integrated error signal to said equalizer transmission networks.
Claim 2
Dependent Claim
96 words
Apparatus for adjusting an equalizer, excited by an applied signal, having a plurality of adjustable transmission networks 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 responsive to said output signal for developing a plurality of control signals representative of the effective frequency range of predetermined passbands of said equalizer; means responsive to said control signals for integrating said error signal; and means responsive to said control signals for selectively applying said integrated error signal to said equalizer transmission networks.
Claim 3
Dependent Claim
77 words
The apparatus of claim 1 wherein said means for developing a plurality of control signals comprises: limiter means for developing a train of pulses in response to said output signal; binary counter means responsive to said train of pulses for developing signals indicative of the number of applied pulses; and logic means responsive to the signals of said binary counter means for developing said control signals upon the occurrence of predetermined signal frequencies in said output signal.
Claim 4
Dependent Claim
110 words
Apparatus responsive to the output signal of an equalizer for adjusting said equalizer comprising: means for developing an error signal corresponding to the difference between said output signal and a predetermined reference signal; means responsive to said output signal for developing a plurality of pairs of frequency control signals, each pair of signals representing the effective frequency range of a predetermined passband of said equalizer; means responsive to said control signals for integrating said error signal; means responsive to said control signals for converting said integrated error signal into a digital signal; and means responsive to said control signals for selectively applying said digital signal to said equalizer transmission networks.
Claim 5
Dependent Claim
110 words
Apparatus responsive to the output signal of an equalizer for adjusting said equalizer comprising: means for developing an error signal corresponding to the difference between said output signal and a predetermined reference signal; means responsive to said output signal for developing a plurality of pairs of frequency control signals, each pair of signals representing the effective frequency range of a predetermined passband of said equalizer; means responsive to said control signals for integrating said error signal; means responsive to said control signals for converting said integrated error signal into a digital signal; and means responsive to said control signals for selectively applying said digital signal to said equalizer transmission networks.
Claim 6
Dependent Claim
73 words
The apparatus of claim 3 wherein said means for developing a plurality of pairs of frequency control signals comprises: means for developing a train of pulses in response to said output signal; counter means for developing signals indicative of the number of pulses in said train; and logic means responsive to the signals of said counter means for developing said control signals upon the occurrence of predetermined signal frequencies in said output signal.
Claim 7
Dependent Claim
126 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 an output signal developed by said equalizer and a predetermined reference signal; means responsive to said output signal for developing a plurality of pairs of frequency control signals, each pair of signals representing the effective frequency range of a predetermined passband of said equalizer; means for integrating said error signal; means for converting said integrated error signal into a digital signal; means for selectively applying said digital signal to said equalizer transmission networks; and means responsive to said pairs of frequency control signals for selectiVely activating said integrating means, said converting means, and said applying means.
Claim 8
Dependent Claim
126 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 an output signal developed by said equalizer and a predetermined reference signal; means responsive to said output signal for developing a plurality of pairs of frequency control signals, each pair of signals representing the effective frequency range of a predetermined passband of said equalizer; means for integrating said error signal; means for converting said integrated error signal into a digital signal; means for selectively applying said digital signal to said equalizer transmission networks; and means responsive to said pairs of frequency control signals for selectiVely activating said integrating means, said converting means, and said applying means.
Claim 9
Dependent Claim
94 words
In a transmission system wherein an equalizer, having a plurality of adjustable transmission networks, develops an output signal in response to an applied signal, the combination comprising: 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 control signals in response to said output signal; means responsive to said control signals for integrating said error signal over predetermined frequency intervals; and means responsive to said control signals for selectively applying said integrated error signal to said equalizer transmission networks.
Claim 10
Dependent Claim
94 words
In a transmission system wherein an equalizer, having a plurality of adjustable transmission networks, develops an output signal in response to an applied signal, the combination comprising: 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 control signals in response to said output signal; means responsive to said control signals for integrating said error signal over predetermined frequency intervals; and means responsive to said control signals for selectively applying said integrated error signal to said equalizer transmission networks.
Claim 11
Dependent Claim
75 words
The combination of claim 6 wherein said means for developing a plurality of control signals comprises: means for developing a train of pulses having the same periodicity as said output signal; counter means responsive to said train of pulses for developing signals indicative of the signal frequencies of said output signal; and logic means responsive to said indicative signals for developing said control signals upon the occurrence of predetermined signal frequencies in said output signal.
Claim 12
Dependent Claim
114 words
In a transmission system wherein an equalizer, having a plurality of adjustable transmission networks, develops an output signal in response to an applied signal, the combination comprising: means for developing an error signal corresponding to the difference between said output signal and a predetermined reference signal; means responsive to said output signal for developing a plurality of control signals upon the occurrence of predetermined signal frequencies in said output signal; means responsive to said control signals for integrating said error signal over predetermined frequency intervals; means for converting said integrated error signal into a digital signal; and means responsive to said control signals for selectively applying said digital signal to said equalizer transmission networks.
Claim 13
Dependent Claim
114 words
In a transmission system wherein an equalizer, having a plurality of adjustable transmission networks, develops an output signal in response to an applied signal, the combination comprising: means for developing an error signal corresponding to the difference between said output signal and a predetermined reference signal; means responsive to said output signal for developing a plurality of control signals upon the occurrence of predetermined signal frequencies in said output signal; means responsive to said control signals for integrating said error signal over predetermined frequency intervals; means for converting said integrated error signal into a digital signal; and means responsive to said control signals for selectively applying said digital signal to said equalizer transmission networks.
Claim 14
Dependent Claim
68 words
The combination of claim 8 wherein said means for developing a plurality of control signals comprises: limiter means for developing a train of pulses in response to said output signal; binary counter means responsive to said train of pulses for developing signals indicative of the signal frequencies of said output signal; and logic means responsive to the signals of said binary counter means for developing said control signals.
Claim 15
Dependent Claim
141 words
In a transmission system wherein an equalizer, having a plurality of adjustable transmission networks, develops an output signal in response to an applied signal, the combination comprising: means for developing an error signal corresponding to the difference between said output signal and a predetermined reference signal; means for converting said output signal into a train of pulses; means for developing a plurality of frequency control signals in response to said train of pulses; means for developing a plurality of logic control signals in response to said frequency control signals; means responsive to said logic control signals for integrating said error signal over predetermined frequency intervals; means responsive to said logic control signals for converting said integrated error signal into a digital signal; and means responsive to said logic control signals for selectively applying said digital signal to said equalizer transmission networks.
Claim 16
Dependent Claim
141 words
In a transmission system wherein an equalizer, having a plurality of adjustable transmission networks, develops an output signal in response to an applied signal, the combination comprising: means for developing an error signal corresponding to the difference between said output signal and a predetermined reference signal; means for converting said output signal into a train of pulses; means for developing a plurality of frequency control signals in response to said train of pulses; means for developing a plurality of logic control signals in response to said frequency control signals; means responsive to said logic control signals for integrating said error signal over predetermined frequency intervals; means responsive to said logic control signals for converting said integrated error signal into a digital signal; and means responsive to said logic control signals for selectively applying said digital signal to said equalizer transmission networks.
Claim 17
Dependent Claim
65 words
The combination of claim 10 wherein said means for developing a plurality of frequency control signals comprises: binary counter means responsive to said train of pulses for developing signals indicative of the frequency of said output signal; and network means responsive to the signals of said binary counter means for developing said control signals upon the occurrence of predetermined signal frequencies in said output signal.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |