Patent US4047114A successfully refreshed from Google Patents.
US4047114A
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Digital detector
Assignee: United States Department of the Army
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Filing: 1976-08-06
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Granted: 1977-09-06
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Expires: 1996-08-06
Abstract
Abstract A digital detector which responds to sinusoidal or square wave input sign to detect the presence of a particular frequency or band of frequencies and provide a selectable digital output indicating the presence of this frequency or band. A gated pulse generator operates in response to the input signals, providing pulses that are counted by a binary counter and sensed by a decoder which detects the presence or absence of the frequencies within the selectable bandwidth limits.
Inventors
- 👤 Richard A. Lane
- 👤 Donald K. Fronek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:25
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/446; H04Q1/448; G; G01; G01R; G01R23/00; G01R23/02; G01R23/15; H04L; H04L27/00; H04L27/10; H04L27/14; H04L27/156; H04L27/1563
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
A digital detector for detecting the presence of selected frequencies in an input signal comprising: counting means having an input and an output; a NAND gate having first and second inputs and an output, said output being coupled to said counting means input; shaping means having an input for receiving said input frequency signals and an output for providing a shaped gating pulse, the output of said shaping means being coupled to the first input of said NAND gate; a pulse generator having an output coupled to said second NAND gate input and having a gating input coupled to said shaping means output; and a decoder circuit coupled to said counter output for responding to said counter output to provide output pulses as a function of said detector input frequencies.
Claim 2
Dependent Claim
130 words
A digital detector for detecting the presence of selected frequencies in an input signal comprising: counting means having an input and an output; a NAND gate having first and second inputs and an output, said output being coupled to said counting means input; shaping means having an input for receiving said input frequency signals and an output for providing a shaped gating pulse, the output of said shaping means being coupled to the first input of said NAND gate; a pulse generator having an output coupled to said second NAND gate input and having a gating input coupled to said shaping means output; and a decoder circuit coupled to said counter output for responding to said counter output to provide output pulses as a function of said detector input frequencies.
Claim 3
Dependent Claim
24 words
A digital detector as set forth in claim 1 wherein said counter is a binary counter and said shaping means is a Schmitt trigger.
Claim 4
Dependent Claim
33 words
A digital detector as set forth in claim 2 and further comprising a bistable latch coupled between said counter output and said decoder input, and wherein said decoder is a multiple-input NAND gate.
Claim 5
Dependent Claim
49 words
A digital detector as set forth in claim 3 and further comprising a monostable multivibrator having an input coupled to the output of said Schmitt trigger and first and second outputs coupled respectively as inputs to said counter and said latch for clearing said counter and switching said latch.
Claim 6
Dependent Claim
25 words
A digital detector as set forth in claim 4 wherein said pulse generator is an oscillator and said bistable latch is a flip-flop latching circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |