US3784980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Serially operated comparison system with discontinuance of comparison on first mismatch
Assignee: Thales SA
•
Filing: 1972-06-08
•
Granted: 1974-01-08
•
Expires: 1992-06-08
Abstract
Abstract The components of a message signal to be identified are serially fed to a comparator which compares them, one at a time, with like-ranking components of a reference signal registered in a display unit. Upon detecting a match between the first components of the two signals, the comparator steps a counter to call out from the display unit the second component of the reference signal for comparison with that of the incoming message signal, and so forth. In the event of a mismatch, the counter is reset; if all components match, an output signal is given. If the signals are in binary code, the comparator is a logic circuit; if they are composed of a series of different frequencies, the comparator is a mixer.
Inventors
- 👤 M Geesen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:31
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
A device for identifying a coded message signal by comparing components of said message signal with respective components of a coded reference signal, comprising a single comparator serially receiving at a first input the components of a message signal to be identified, a reading unit whose output is connected to a second input of said comparator for successively feeding thereto the components of a reference signal, a counter connected to the comparator and to the reading unit, said counter advancing by one unity step only if the two compared signal components are identical and generating an output signal only when it is has counted a number equal to that of the signal components of the reference signal, and a source of said reference signal connected to said reading unit, the components of the reference signal being serially called out from said reading unit upon the stepping of said counter.
Claim 2
Independent Claim
149 words
A device for identifying a coded message signal by comparing components of said message signal with respective components of a coded reference signal, comprising a single comparator serially receiving at a first input the components of a message signal to be identified, a reading unit whose output is connected to a second input of said comparator for successively feeding thereto the components of a reference signal, a counter connected to the comparator and to the reading unit, said counter advancing by one unity step only if the two compared signal components are identical and generating an output signal only when it is has counted a number equal to that of the signal components of the reference signal, and a source of said reference signal connected to said reading unit, the components of the reference signal being serially called out from said reading unit upon the stepping of said counter.
Claim 3
Dependent Claim
19 words
A device for identifying a binary-coded message signal according to claim 1, wherein the comparator is an Exclusive-OR element.
Claim 4
Dependent Claim
18 words
A device according to claim 1, further comprising timing means for operating said comparator at predetermined, adjustable moments.
Claim 5
Dependent Claim
20 words
A device according to claim 1, wherein the components of a signal differ from one another as to their frequencies.
Claim 6
Dependent Claim
12 words
A device according to claim 4, wherein the comparator is a mixer.
Claim 7
Dependent Claim
35 words
A device according to claim 5, further comprising a frequency divider between the reading unit and the mixer having means for providing a division factor as a function of the components of said reference signal.
References Cited (Backward Citations)
US2821696A
Cited
US2837732A
Cited
US2910667A
Cited
US2889534A
Cited
US2977574A
Cited
US3348199A
Cited
US3576533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |