Patent US3381218A successfully refreshed from Google Patents.
US3381218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal channel testing method and apparatus utilizing an inverse filter
Assignee: Gulf Research and Development Co
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Filing: 1964-02-17
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Granted: 1968-04-30
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Expires: 1984-02-17
Abstract
No abstract record available.
Inventors
- 👤 Maurice E Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:49
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A METHOD OF TESTING A COMMUNICATION CHANNEL WHICH COMPRISES GENERATING A FIRST SIGNAL HAVING A KNOWN WAVE FORM, FILTERING SAID FIRST SIGNAL THROUGH A FIRST FILTER WHOSE IMPULSE RESPONSE HAS A LAPLACE TRANSFORM (F(S)) SUCH AS TO CONVERT SAID FIRST SIGNAL INTO A SECOND SIGNAL WHOSE WAVE FORM APPROXIMATES THAT OF A SIGNAL NORMALLY TRANSMITTED BY THE CHANNEL TO BE TESTED WHEN IN NORMAL SERVICE, IMPRESSING SAID SECOND SIGNAL ON THE CHANNEL TO BE TESTED TO OBTAIN A THIRD SIGNAL, FILTERING SAID THIRD SIGNAL THROUGH A SECOND FILTER WHOSE IMPULSE RESPONSE HAS A LAPLACE TRANSFORM THAT IS SUBSTANTIALLY THE RECIPROCAL OF THE LAPLACE TRANSFORM (1/F(S)) OF THE IMPULSE RESPONSE OF SAID FIRST FILTER TO OBTAIN A FOURTH SIGNAL, AND DISPLAYING THE WAVE FORM OF SAID FIRST AND SAID FOURTH SIGNALS, WHEREBY THE WAVE FORM OF SAID FOURTH SIGNAL MAY BE COMPARED WITH THAT OF SAID FIRST SIGNAL.
Claim 2
Independent Claim
147 words
A METHOD OF TESTING A COMMUNICATION CHANNEL WHICH COMPRISES GENERATING A FIRST SIGNAL HAVING A KNOWN WAVE FORM, FILTERING SAID FIRST SIGNAL THROUGH A FIRST FILTER WHOSE IMPULSE RESPONSE HAS A LAPLACE TRANSFORM (F(S)) SUCH AS TO CONVERT SAID FIRST SIGNAL INTO A SECOND SIGNAL WHOSE WAVE FORM APPROXIMATES THAT OF A SIGNAL NORMALLY TRANSMITTED BY THE CHANNEL TO BE TESTED WHEN IN NORMAL SERVICE, IMPRESSING SAID SECOND SIGNAL ON THE CHANNEL TO BE TESTED TO OBTAIN A THIRD SIGNAL, FILTERING SAID THIRD SIGNAL THROUGH A SECOND FILTER WHOSE IMPULSE RESPONSE HAS A LAPLACE TRANSFORM THAT IS SUBSTANTIALLY THE RECIPROCAL OF THE LAPLACE TRANSFORM (1/F(S)) OF THE IMPULSE RESPONSE OF SAID FIRST FILTER TO OBTAIN A FOURTH SIGNAL, AND DISPLAYING THE WAVE FORM OF SAID FIRST AND SAID FOURTH SIGNALS, WHEREBY THE WAVE FORM OF SAID FOURTH SIGNAL MAY BE COMPARED WITH THAT OF SAID FIRST 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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |