US3689884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital correlator for calculating figure of merit of communication transmission system
Assignee: General Electric Co
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Filing: 1970-12-31
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Granted: 1972-09-05
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Expires: 1990-12-31
Abstract
Abstract A circuit for providing a measure of the fidelity of a communication transmission (figure of merit) by determining the correlation between a transmitted sequence of digital numbers with the same numbers locally generated. The number of correlated digital numbers is counted (hits) which occur during a transmission of a total number of digital numbers (hits plus misses). The number of hits in binary form is converted to the number of hits minus misses by shifting the digit in the most significant bit position to that of the least significant bit. This binary number is a close approximation of the figure of merit (disregarding the decimal point).
Inventors
- 👤 Walter Hosey Tew Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:24
CPC Classifications
H; H04; H04L; H04L43/00; H04L43/50
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
241 words
In a communication transmission system having a transmitter, an intervening media, and a receiver, a digital correlator for producing a figure of merit comprising: a first probe signal generator producing a sequence of binary digits; means for applying said sequence of binary digits to said transmitter; probe signal recovery means connected to said receiver for extracting said sequence of digits; a second probe signal generator producing a sequence of binary digits identical to those produced by said first probe signal generator and in synchronism with those extracTed from said receiver; means for comparing the extracted sequence and the sequence produced by said second probe signal generator and producing an output signal for each hit; a binary counter connected to receive said hit output signals and incremented by one for each output signal and adapted to transfer its contents upon receiving a clear signal; a figure of merit register connected to receive upon a clear signal, in a parallel transfer mode, the contents of said binary counter except that the most significant bit of said binary counter contents becomes the least significant bit of the figure of merit register; clock means producing pulses at the rate of the probe signal; and an N-stage binary counter connected to receive the pulses produced by said clock means, incremented at the rate of the probe signal and delivering a clear signal at the 2N-1 count to said binary counter and said figure of merit register.
Claim 2
Dependent Claim
241 words
In a communication transmission system having a transmitter, an intervening media, and a receiver, a digital correlator for producing a figure of merit comprising: a first probe signal generator producing a sequence of binary digits; means for applying said sequence of binary digits to said transmitter; probe signal recovery means connected to said receiver for extracting said sequence of digits; a second probe signal generator producing a sequence of binary digits identical to those produced by said first probe signal generator and in synchronism with those extracTed from said receiver; means for comparing the extracted sequence and the sequence produced by said second probe signal generator and producing an output signal for each hit; a binary counter connected to receive said hit output signals and incremented by one for each output signal and adapted to transfer its contents upon receiving a clear signal; a figure of merit register connected to receive upon a clear signal, in a parallel transfer mode, the contents of said binary counter except that the most significant bit of said binary counter contents becomes the least significant bit of the figure of merit register; clock means producing pulses at the rate of the probe signal; and an N-stage binary counter connected to receive the pulses produced by said clock means, incremented at the rate of the probe signal and delivering a clear signal at the 2N-1 count to said binary counter and said figure of merit register.
Claim 3
Dependent Claim
48 words
A communication system in accordance with claim 1 wherein: said means for comparing the extracted sequence and the sequence produced by said second probe signal generator is a modulo 2 adder connected to receive the outputs of the probe signal recovery means and the second probe signal generator.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |