US4480236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Channelized serial adaptive filter processor
Assignee: Unisys Corp
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Filing: 1982-07-01
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Granted: 1984-10-30
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Expires: 2002-07-01
Abstract
Abstract A method and apparatus for eliminating narrow band noise and interference from a wide band signal while maintaining the wide band signal substantially intact.
Inventors
- 👤 Richard W. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:28
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/34; H03H11/346
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
A filter circuit system comprising, input means for supplying a wideband signal which contains undesirable narrowband signal components, bandpass filter means connected to said input means, adaptive filter means connected to receive signals from said bandpass filter means, and summing means connected to sum said input signal and the signal produced by said adaptive filter means and to produce a control signal which is applied to said adaptive filter means to control the operation thereof.
Claim 2
Dependent Claim
75 words
A filter circuit system comprising, input means for supplying a wideband signal which contains undesirable narrowband signal components, bandpass filter means connected to said input means, adaptive filter means connected to receive signals from said bandpass filter means, and summing means connected to sum said input signal and the signal produced by said adaptive filter means and to produce a control signal which is applied to said adaptive filter means to control the operation thereof.
Claim 3
Dependent Claim
77 words
The system recited in claim 1 including, second bandpass filter means connected to receive the output signal from said summing means, second adaptive filter means connected to receive signals from said second bandpass filter means, and second summing means connected to sum the output signals from said first summing means and said second adaptive filter means and to produce a second control signal which is applied to said second adaptive filter means to control the operation thereof.
Claim 4
Dependent Claim
22 words
The system recited in claim 2 wherein, said bandpass filter means and said second bandpass filter means each have different bandpass characteristics.
Claim 5
Dependent Claim
16 words
The system recited in claim 1 wherein, said adaptive filter means has a variable scaling factor.
Claim 6
Dependent Claim
21 words
The system recited in claim 1 wherein, said adaptive filter means produces a narrowband output signal relative to said wideband signal.
Claim 7
Independent Claim
64 words
A method of separating wideband signals from narrowband signals wherein, a combined signal including wideband and narrowband signal components is supplied to at least one summing apparatus, said combined signal is supplied to a bandpass filter and an adaptive filter series combination to produce a first narrowband signal, and said first narrowband signal is algebraically summed with said combined signal at said summing apparatus.
Claim 8
Independent Claim
64 words
A method of separating wideband signals from narrowband signals wherein, a combined signal including wideband and narrowband signal components is supplied to at least one summing apparatus, said combined signal is supplied to a bandpass filter and an adaptive filter series combination to produce a first narrowband signal, and said first narrowband signal is algebraically summed with said combined signal at said summing apparatus.
Claim 9
Dependent Claim
22 words
The method recited in claim 6 wherein, said algebraic summing effects an accurate subtraction of said narrowband signals from the combined signal.
Claim 10
Independent Claim
49 words
The method of separating narrowband signals from wideband signals by passing the wideband signal through a plurality of serially cascaded adaptive filters which filters individually operate upon the narrowband signals such that the filters collectively separate the narrowband signals from the wideband signal while leaving the wideband entirely intact.
Claim 11
Independent Claim
49 words
The method of separating narrowband signals from wideband signals by passing the wideband signal through a plurality of serially cascaded adaptive filters which filters individually operate upon the narrowband signals such that the filters collectively separate the narrowband signals from the wideband signal while leaving the wideband entirely intact.
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) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |