US4016511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Programmable variable length high speed digital delay line
Assignee: United States Department of the Air Force
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Filing: 1975-12-19
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Granted: 1977-04-05
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Expires: 1995-12-19
Abstract
Abstract A variable length, digital delay line apparatus utilizing a set of progressively increasing delay devices in conjunction with a set of digitally selectable switching units to vary the delay times over a predetermined delay range.
Inventors
- 👤 John L. Ramsey
- 👤 Allen E. Post
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:36
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/13; H03K5/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
101 words
A variable length, high speed, digital delay line apparatus comprising in combination: a set of serially arranged, fixed-length, digital delay units, and a set of switching units interposed respectively between each of said set of delay units, said set of switching units having a set of switching position, said set of switching positions being one greater than the rank of the switching unit position within the delay unit chain, each switching position of said set of switching units being connected to a switching position within a switching unit of greater rank, each of said set of switching units being respectively selectable.
Claim 2
Dependent Claim
101 words
A variable length, high speed, digital delay line apparatus comprising in combination: a set of serially arranged, fixed-length, digital delay units, and a set of switching units interposed respectively between each of said set of delay units, said set of switching units having a set of switching position, said set of switching positions being one greater than the rank of the switching unit position within the delay unit chain, each switching position of said set of switching units being connected to a switching position within a switching unit of greater rank, each of said set of switching units being respectively selectable.
Claim 3
Dependent Claim
42 words
A variable length, high speed, digital delay line apparatus as described in claim 1 further including digital decoding means for selecting one of said set of switching units, said digital decoding means being interconnected with each of said set of switching units.
Claim 4
Dependent Claim
38 words
A variable length, high speed, digital delay line apparatus as described in claim 1 wherein said set of digital delay units comprise in combination: a set of shift registers having a geometrically increasing varying number of binary stages.
Claim 5
Dependent Claim
58 words
A variable length, high speed, digital delay line apparatus as described in claim 1 wherein said set of switching units comprise in combination: a set of binary selector units, each respectively having a progressively increasing number of digital selector bits therein, said selector positions varying between 2 and N-1, where N is any positive integer greater than 0.
Claim 6
Dependent Claim
61 words
A variable length, high speed, digital delay line apparatus as described in claim 2 wherein said digital selecting means comprises in combination: a binary decoding circuit to receive an N-bit delay length word, said binary decoding circuit decoding said N-bit delay length word to activate the proper switching units of said set of switching units to provide the desired delay time.
Claim 7
Dependent Claim
37 words
A variable length, high speed, digital delay line apparatus as described in claim 3 wherein said number of binary stages varies between one and 2N - 1 , wherein N is any positive integer greater than 0.
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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |