US3860892A
Expired / Lapsed
US
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Cascade transversal filter amplitude-compensation network
Assignee: National Aeronautics and Space Administration
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Filing: 1974-02-25
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Granted: 1975-01-14
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Expires: 1994-02-25
Abstract
Abstract This invention relates to an amplitude-compensation network consisting of a cascaded series of N transversal filters, each transversal filter of the network having a specified transfer function, H1(f), H2(f),...,Hn (f) where Hk(f) eQk cos 2 pi kfd, and where Qk is a constant and d 1 is the period. The tap weights for each filter are derived from the relationship gm Im(q) when q is positive and gm (-1)mIm(-q), if q is negative. Here, Im denotes the modified Bessel function of the first kind and q is a constant for the kth filter q Qk.
Inventors
- 👤 Jeffrey M Speiser
- 👤 George W Byram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:16
CPC Classifications
H; H03; H03H; H03H17/00; H03H17/02; H03H17/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
70 words
An amplitude-compensating network, with zero phase shift or shift varying linearly with frequency, and specified attenuation as a function of frequency, comprising: a cascaded combination of simple transversal filters, including an input transversal filter connectable to an input signal, the filters of the combination having transfer functions from input to output, of H1(f), H2(f), . . . , HN(f), where each of the terms Hn(f) is defined by the equation
Claim 2
Dependent Claim
70 words
An amplitude-compensating network, with zero phase shift or shift varying linearly with frequency, and specified attenuation as a function of frequency, comprising: a cascaded combination of simple transversal filters, including an input transversal filter connectable to an input signal, the filters of the combination having transfer functions from input to output, of H1(f), H2(f), . . . , HN(f), where each of the terms Hn(f) is defined by the equation
Claim 3
Dependent Claim
21 words
The amplitude-compensation network according to claim 1, wherein the network corresponds to the implementation of the function Q(f) log H(f) .
References Cited (Backward Citations)
US3727153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |