US3920907A
Expired / Lapsed
US
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Periodic signal detector
Assignee: United States Department of the Navy
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Filing: 1974-07-03
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Granted: 1975-11-18
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Expires: 1994-07-03
Abstract
Abstract A periodic signal detector is disclosed which may be incorporated to an advantage 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 respectively connected to the inputs of a pair of ramp generators. A differential comparator detects the difference in the output voltage from said pair of ramp generators and uses it to timely trigger a first monostable multivibrator. A shift register and AND gate extracts a desired program of successive binary signals from the output signal from said first monostable multivibrator. A second monostable multivibrator, triggered by one of the outputs of said bistable multivibrator, in turn, resets said ramp generators and timely shifts said shift register. The output of said AND gate is used to key a transmitter or some other utilization apparatus.
Inventors
- 👤 Jr Walter W Mullen
- 👤 Iii George L Hooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:59
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/44; H04B1/46
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
327 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 a predetermined directional transition of 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 substantially linearly 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 substantially linearly 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 and proportional 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 and proportional to said fifth signal; means connected to the outputs of said ninth and tenth signals producing means for producing an eleventh signal whenever a predetermined program of successive binary signals occurs within said ninth signal; 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
327 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 a predetermined directional transition of 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 substantially linearly 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 substantially linearly 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 and proportional 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 and proportional to said fifth signal; means connected to the outputs of said ninth and tenth signals producing means for producing an eleventh signal whenever a predetermined program of successive binary signals occurs within said ninth signal; 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
37 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 sixth signal in response to said fourth signal comprises a ramp generator.
Claim 7
Dependent Claim
39 words
The device of claim 1, wherein said means connected to the other of said outputs of said polarized signals producing means for generating a substantially linearly increasing seventh signal in response to said fifth signal comprises a ramp generator.
Claim 8
Dependent Claim
47 words
The device of claim 1, wherein said means connected to the outputs of said sixth and seventh signals 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
90 words
The device of claim 1 wherein said means connected to the output of said ninth and tenth signal producing means for producing an eleventh signal whenever a predetermined program of successive binary signals occurs within said ninth signal comprises: a shift register having a data input, a clock shift input, a reset input, and a plurality of outputs, with the data input thereof connected to the output of said ninth signal producing means, and with the clock shift input thereof connected to the output of said tenth signal producing means.
Claim 12
Dependent Claim
38 words
The device of claim 1, wherein said 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 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
33 words
The invention of claim 1, further characterized by: a transmitter effectively connected to the output of said eleventh signal producing means; and a transmitting electroacoustical transducer connected to the output of said transmitter.
Claim 17
Dependent Claim
29 words
The invention of claim 1, further characterized by means connected to the output of said eleventh signal producing means for broadcasting a predetermined signal throughout a predetermined environmental medium.
Claim 18
Dependent Claim
98 words
The device of claim 1, further characterized by: a switching circuit effectively connected to The output of said eleventh signal producing means; a transmitter having a data signal input, a keying input, and an output, with the data signal input thereof connected to the input of the aforesaid means for receiving a first signal of complex frequencies and for passing those frequenceis thereof that are below a predetrmined frequency as a second signal, 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 19
Dependent Claim
273 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 in such manner as to be responsive to a predetermined transition of the limited signal therefrom; a first ramp generator connected to one of the outputs of said bistable multivibrator; a second ramp 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 ramp generators; a first monostable multivibrator connected to the output of said differential comparator; a second monostable multivibrator connected to one of the outputs of the aforesaid bistable multivibrator; means connected between the output of said second monostable multivibrator and the inputs of said first and second ramp generators for effecting the timely resetting thereof; a multi-stage shift register having a data input, a clock shift input, a reset input, and a plurality of outputs, the number of which is equal to the number of stages thereof, with the data inputs thereof connected to the outputs of said first monostable multivibrator, and with the clock shift input thereof connected to the output of said second monostable multivibrator; and an AND gate having a plurality of inputs and an output, with the plurality of inputs thereof respectively connected to the plurality of outputs of the aforesaid multi-stage shift register.
Claim 20
Dependent Claim
273 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 in such manner as to be responsive to a predetermined transition of the limited signal therefrom; a first ramp generator connected to one of the outputs of said bistable multivibrator; a second ramp 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 ramp generators; a first monostable multivibrator connected to the output of said differential comparator; a second monostable multivibrator connected to one of the outputs of the aforesaid bistable multivibrator; means connected between the output of said second monostable multivibrator and the inputs of said first and second ramp generators for effecting the timely resetting thereof; a multi-stage shift register having a data input, a clock shift input, a reset input, and a plurality of outputs, the number of which is equal to the number of stages thereof, with the data inputs thereof connected to the outputs of said first monostable multivibrator, and with the clock shift input thereof connected to the output of said second monostable multivibrator; and an AND gate having a plurality of inputs and an output, with the plurality of inputs thereof respectively connected to the plurality of outputs of the aforesaid multi-stage shift register.
Claim 21
Dependent Claim
29 words
The invention of claim 18, further characterized by a delay line connected between the output of said AND gate and the reset input of the aforesaid multi-stage shift register.
Claim 22
Dependent Claim
90 words
The invention of claim 19, 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 AND gate; 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)
US3335225A
Cited
US3767860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |