Patent US3875336A successfully refreshed from Google Patents.
US3875336A
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Periodic signal detector
Assignee: United States Department of the Navy
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Filing: 1974-01-24
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Granted: 1975-04-01
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Expires: 1994-01-24
Abstract
Abstract A periodic signal detector is disclosed that may be incorporated in a voice actuated communication system. It comprises a series connected low pass filter, limiter, and bistable multivibrator, the outputs of the latter of which are connected to a pair of sweep generators. A differential comparator detects the difference in the outputs from said pair of sweep generators and uses said differences as a signal to trigger a first monostable multivibrator. A second monostable multivibrator is triggered by one of the outputs of the aforesaid bistable multivibrator. An AND gate detects the simultaneous occurrence of the outputs from said first and second monostable multivibrators and produces an output in response thereto. An averaging integrator averages the output signal from said AND gate to a more useful level before it is, in turn, used to effectively key a transmitter or some other utilization apparatus. An input utilization apparatus, such as a receiving transducer, provides the complex frequency input signal to the subject periodic signal detector, from which a predetermined frequency periodicy is to be detected thereby.
Inventors
- 👤 Jr Walter W Mullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:18
CPC Classifications
G; G10; G10L; G10L25/00; G10L25/78
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
311 words
A periodic signal detector, comprising in combination: means for receiving a first signal of complex frequencies and for passing those frequencies thereof that are below a predetermined frequency as a second signal; means connected to the output of said receiving and passing means for converting said second signal into a third signal having a substantially squarewave configuration that is corresponding thereto; means having an input and a pair of outputs, with the input thereof connected to the output of said converting means for alternately producing a pair of oppositely polarized fourth and fifth signals at the outputs thereof in response to the squarewave configurations of said third signal, respectively; means connected to one of the outputs of said oppositely polarized signal producing means for generating a predetermined increasing sixth signal in response to said fourth signal; means connected to the other of the outputs of said polarized signals producing means for generating a predetermined increasing seventh signal in response to said fifth signal; means connected to the outputs of said sixth and seventh signal producing means for comparing the magnitudes of said sixth and seventh signals and for producing an eighth signal that is proportional to the difference therebetween; means connected to the outputs of said sixth and seventh signals comparing means for producing a ninth signal of predetermined duration in response to said eighth signal; means connected to the other of the outputs of the aforesaid oppositely polarized signals producing means for producing a tenth signal of predetermined duration in response to said fifth signal; means connected to the outputs of said ninth and tenth signals producing means for producing an eleventh signal whenever said ninth and tenth signals occur simultaneously; and means connected to the output of said tenth signal producing means for timely resetting the aforesaid sixth and seventh signals producing means in response to said tenth signal.
Claim 2
Dependent Claim
311 words
A periodic signal detector, comprising in combination: means for receiving a first signal of complex frequencies and for passing those frequencies thereof that are below a predetermined frequency as a second signal; means connected to the output of said receiving and passing means for converting said second signal into a third signal having a substantially squarewave configuration that is corresponding thereto; means having an input and a pair of outputs, with the input thereof connected to the output of said converting means for alternately producing a pair of oppositely polarized fourth and fifth signals at the outputs thereof in response to the squarewave configurations of said third signal, respectively; means connected to one of the outputs of said oppositely polarized signal producing means for generating a predetermined increasing sixth signal in response to said fourth signal; means connected to the other of the outputs of said polarized signals producing means for generating a predetermined increasing seventh signal in response to said fifth signal; means connected to the outputs of said sixth and seventh signal producing means for comparing the magnitudes of said sixth and seventh signals and for producing an eighth signal that is proportional to the difference therebetween; means connected to the outputs of said sixth and seventh signals comparing means for producing a ninth signal of predetermined duration in response to said eighth signal; means connected to the other of the outputs of the aforesaid oppositely polarized signals producing means for producing a tenth signal of predetermined duration in response to said fifth signal; means connected to the outputs of said ninth and tenth signals producing means for producing an eleventh signal whenever said ninth and tenth signals occur simultaneously; and means connected to the output of said tenth signal producing means for timely resetting the aforesaid sixth and seventh signals producing means in response to said tenth signal.
Claim 3
Dependent Claim
37 words
The device of claim 1, wherein said means for receiving a first signal of complex frequencies and for passing those frequencies thereof that are below a predetermined frequency as a second signal comprises a low pass filter.
Claim 4
Dependent Claim
39 words
The device of claim 1, wherein said means connected to the output of said receiving and passing means for converting said second signal into a third signal having a substantially squarewave configuration that is proportional thereto comprises a limiter.
Claim 5
Dependent Claim
59 words
The device of claim 1, wherein said means having an input and a pair of outputs, with the input thereof connected to the output of said converting means for alternately producing a pair of oppositely polarized fourth and fifth signals at the outputs thereof in response to the squarewave configurations of said third signal, respectively, comprises a bistable multivibrator.
Claim 6
Dependent Claim
38 words
The device of claim 1, wherein said means connected to one of the outputs of said oppositely polarized signals producing means for generating a predetermined increasing sixth signal in response to said fourth signal comprises a sweep generator.
Claim 7
Dependent Claim
38 words
The device of claim 1, wherein said means connected to the other of the outputs of said polarized signals producing means for generating a predetermined increasing seventh signal in response to said fifth signal comprises a sweep generatOr.
Claim 8
Dependent Claim
47 words
The device of claim 1, wherein said means connected to the outputs of said sixth and seventh signal producing means for comparing the magnitudes of said sixth and seventh signals and for producing an eighth signal that is proportional to the difference therebetween comprises a differential comparator.
Claim 9
Dependent Claim
38 words
The device of claim 1, wherein said means connected to the outputs of said sixth and seventh signals comparing means for producing a ninth signal of predetermined duration in response to said eighth signal comprises a monostable multivibrator.
Claim 10
Dependent Claim
41 words
The device of claim 1, wherein said means connected to the other of the outputs of the aforesaid oppositely polarized signals producing means for producing a tenth signal of predetermined duration in response to said fifth signal comprises a monostable multivibrator.
Claim 11
Dependent Claim
37 words
The device of claim 1, wherein said means connected to the outputs of said ninth and tenth signals producing means for producing an eleventh signal whenever said ninth and tenth signals occur simultaneously comprises an AND gate.
Claim 12
Dependent Claim
38 words
The device of claim 1, wherein said means connected to the output of said tenth signal produing means for timely resetting the aforesaid sixth and seventh signals producing means in response to said tenth signal comprises electrical conductors.
Claim 13
Dependent Claim
27 words
The invention of claim 1, further characterized by a utilization apparatus connected to the input of said first signal receiving means for supplying said first signal thereto.
Claim 14
Dependent Claim
56 words
The invention of claim 1, further characterized by: a receiving electroacoustical transducer adapted for receiving acoustical energy from within a predetermined environmental medium and producing an electrical signal proportional thereto at the output thereof; and an adjustable gain amplifier connected between the output of said electroacoustical transducer and the input of said first signal receiving means.
Claim 15
Dependent Claim
22 words
The invention of claim 1, further characterized by a utilization apparatus effectively connected to the output of said eleventh signal producing means.
Claim 16
Dependent Claim
34 words
The invention of claim 1, further characterized by means connected to the output of said eleventh signal producing means for producing a twelfth signal that is the average voltage level of said eleventh signal.
Claim 17
Dependent Claim
20 words
The invention of claim 1, further characterized by a utilization apparatus connected to the output of twelfth signal producing means.
Claim 18
Dependent Claim
20 words
The invention of claim 1, further characterized by an integrator connected to the output of said eleventh signal producing means.
Claim 19
Dependent Claim
29 words
The invention of claim 17, further characterized by: a transmitter effectively connected to the output of said integrator; and an electroacoustical transducer connected to the output of said transmitter.
Claim 20
Dependent Claim
26 words
The invention of claim 17, further characterized by means connected to the output of said integrator for broadcasting a predetermined signal throughout a predetermined environmental medium.
Claim 21
Dependent Claim
18 words
The invention of claim 17, further characterized by a utilization apparatus connected to the output of said integrator.
Claim 22
Dependent Claim
74 words
The device of claim 20, wherein said utilization apparatus comprises: a switching circuit effectively connected to the output of said integrator; a transmitter having a data signal input, a keying input, and an output, with the data signal input thereof connected to the input of said low pass filter and with the keying input thereof connected to the output of said switching circuit; and a transmitting transducer connected to the output of said transmitter.
Claim 23
Dependent Claim
192 words
A periodic signal detector, comprising in combination: a low pass filter adapted for receiving the signal containing the periodicy to be detected; a limiter connected to the output of said low pass filter; a bistable multivibrator having an input and a pair of outputs, with the input thereof connected to the output of said limiter; a first sweep generator connected to one of the outputs of said bistable multivibrator; a second sweep generator connected to the other of the outputs of said bistable multivibrator; a differential comparator having a pair of inputs and an output, with the inputs thereof respectively connected to the outputs of said first and second sweep generators; a first monostable multivibrator connected to the output of said differential comparator; a second monostable multivibrator connected to the other of the outputs of the aforesaid bistable multivibrator; an AND gate having a pair of inputs and an output, with the inputs thereof respectively connected to the outputs of the aforesaid first and second monostable multivibrators; and means connected between the output of said second monostable multivibrator and inputs of said first and second sweep generators for the timely resetting thereof.
Claim 24
Dependent Claim
192 words
A periodic signal detector, comprising in combination: a low pass filter adapted for receiving the signal containing the periodicy to be detected; a limiter connected to the output of said low pass filter; a bistable multivibrator having an input and a pair of outputs, with the input thereof connected to the output of said limiter; a first sweep generator connected to one of the outputs of said bistable multivibrator; a second sweep generator connected to the other of the outputs of said bistable multivibrator; a differential comparator having a pair of inputs and an output, with the inputs thereof respectively connected to the outputs of said first and second sweep generators; a first monostable multivibrator connected to the output of said differential comparator; a second monostable multivibrator connected to the other of the outputs of the aforesaid bistable multivibrator; an AND gate having a pair of inputs and an output, with the inputs thereof respectively connected to the outputs of the aforesaid first and second monostable multivibrators; and means connected between the output of said second monostable multivibrator and inputs of said first and second sweep generators for the timely resetting thereof.
Claim 25
Dependent Claim
19 words
The invention of claim 22, further characterized by an averaging integrator connected to the output of said AND gate.
Claim 26
Dependent Claim
91 words
The invention of claim 23, further characterized by: a receiving transducer, with the output thereof effectively connected to the input of the aforesaid low pass filter; a switching circuit effectively connected to the output of said averaging integrator; a transmitter having a data signal input, a keying input, and an output, with the data signal input thereof effectively connected to the output of said receiving transducer, and with the keying input thereof connected to the output of said switching circuit; and a transmitting transducer connected to the output of said transmitter.
References Cited (Backward Citations)
US3761809A
Cited
US3688126A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |