US3633117A
Expired / Lapsed
US
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Suppression of a phase-sensitive spectral component from a signal
Assignee: TDK Micronas GmbH
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Filing: 1970-07-29
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Granted: 1972-01-04
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Expires: 1990-07-29
Abstract
Abstract A method and apparatus for suppressing a phase-sensitive spectral component from a given signal. A phase and amplitudesensitive blocking pulse is generated at the frequency of the spectral component. This blocking pulse is subtracted from the signal and the unsuppressed portion of the spectral component is used to adjust the phase and amplitude of the blocking pulse, so as to more completely eliminate the spectral component from the signal.
Inventors
- 👤 Robert A Reilly Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:04
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/20; G01S1/24; H; H03; H03H; H03H19/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
228 words
Apparatus for suppressing a phase-sensitive spectral component from a signal comprising: means for filtering said phase-sensitive spectral component from said signal; means for generating first and second reference pulses at the frequency of said spectral component, said second reference pulse being in phase quadrature with said first reference pulse; means coupled to said first and second reference pulses and said filtered spectral component for converting said filtered spectral component into respective first and second phase quadrature error signals; first and second means coupled to said first and second reference pulses, respectively, and to said respective first and second phase quadrature error signals for multiplying the respective first and second reference pulses by a factor varying between 0 and 1, the factor of each of said first and second multiplying means being determined by said respective first and second phase quadrature error signals; means coupled to the multiplied first and second reference pulses for summing the multiplied first and second reference pulses to obtain said blocking pulse at the frequency of said spectral component; means coupled to said blocking pulse and said input signal for subtracting said blocking pulse from said signal; and means for coupling the remainder of said signal to said filtering means, so as to readjust the amplitude and phase of said blocking pulse in order to more completely eliminate said spectral component from said signal.
Claim 2
Dependent Claim
228 words
Apparatus for suppressing a phase-sensitive spectral component from a signal comprising: means for filtering said phase-sensitive spectral component from said signal; means for generating first and second reference pulses at the frequency of said spectral component, said second reference pulse being in phase quadrature with said first reference pulse; means coupled to said first and second reference pulses and said filtered spectral component for converting said filtered spectral component into respective first and second phase quadrature error signals; first and second means coupled to said first and second reference pulses, respectively, and to said respective first and second phase quadrature error signals for multiplying the respective first and second reference pulses by a factor varying between 0 and 1, the factor of each of said first and second multiplying means being determined by said respective first and second phase quadrature error signals; means coupled to the multiplied first and second reference pulses for summing the multiplied first and second reference pulses to obtain said blocking pulse at the frequency of said spectral component; means coupled to said blocking pulse and said input signal for subtracting said blocking pulse from said signal; and means for coupling the remainder of said signal to said filtering means, so as to readjust the amplitude and phase of said blocking pulse in order to more completely eliminate said spectral component from said signal.
Claim 3
Dependent Claim
101 words
Apparatus according to claim 1, wherein said converting means further comprises: first and second synchronous detectors coupled to the output of said filtering means, said first reference pulse activating said first synchronous detector, said second reference pulse activating said second synchronous detector, whereby the outputs of each of said detectors are DC error levels in phase quadrature with each other; and first and second accumulator means coupled to the respective outputs of said first and second synchronous detectors for cumulatively producing said respective first and second phase quadrature error signals at the respective outputs of said first and second accumulator means.
Claim 4
Dependent Claim
14 words
Apparatus according to claim 2, wherein said first and second accumulator means are integrators.
Claim 5
Independent Claim
164 words
A method of suppressing a phase-sensitive spectral sensitive component from a signal comprising the steps of: filtering said phase-sensitive spectral component from said signal; generating first and second reference pulses at the frequency of said spectral component, said second reference pulse being in phase quadrature with said first reference pulse; converting said filtered spectral component into respective first and second phase quadrature error signals; multiplying the respective first and second reference pulses by a factor varying between 0 and 1, the multiplying factor for each of said first and second reference pulses being determined by said respective first and second phase quadrature error signals; summing the multiplied first and second reference pulses to obtain said blocking pulse at the frequency of said spectral component; subtracting said blocking pulse from said signal; and readjusting the phase and amplitude of said blocking pulse with the use of the unsuppressed portion of said spectral component so as to more completely eliminate said spectral component from said signal.
Claim 6
Independent Claim
164 words
A method of suppressing a phase-sensitive spectral sensitive component from a signal comprising the steps of: filtering said phase-sensitive spectral component from said signal; generating first and second reference pulses at the frequency of said spectral component, said second reference pulse being in phase quadrature with said first reference pulse; converting said filtered spectral component into respective first and second phase quadrature error signals; multiplying the respective first and second reference pulses by a factor varying between 0 and 1, the multiplying factor for each of said first and second reference pulses being determined by said respective first and second phase quadrature error signals; summing the multiplied first and second reference pulses to obtain said blocking pulse at the frequency of said spectral component; subtracting said blocking pulse from said signal; and readjusting the phase and amplitude of said blocking pulse with the use of the unsuppressed portion of said spectral component so as to more completely eliminate said spectral component from said 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 |