US3714622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive agc system
Assignee: United States Department of the Navy
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Filing: 1969-12-12
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Granted: 1973-01-30
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Expires: 1989-12-12
Abstract
Abstract Acoustic information is applied to a transducer and the electrical signal from the transducer is supplied to a modulator and transmitted if the signal both exceeds a predetermined level for a specified period of time and increases during this time above a specified rate. This is attained by applying the electrical signal to an AGC difference circuit with a feedback control so that the AGC difference circuit provides a constant output that is not transmitted so long as the input signal does not increase above a predetermined rate. If however the signal increases above the predetermined rate a field effect transistor difference amplifier senses the increased rate and fires a Schmitt trigger whose output applied to an integrator circuit for a specified period of time actuates a control gate enabling battery power to be applied to a transmitter for transmission of a modulated signal carrying the acoustic information.
Inventors
- 👤 C Wilhelmsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:25
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/16; G08B13/1654; G08B13/1672; Y; Y10; Y10S; Y10S367/00; Y10S367/901
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
134 words
A detector system comprising: signal generating means for generating an electrical signal; and detecting means having a difference amplifier for receiving both said electrical signal and a feedback signal and providing an output signal, envelope detector means for receiving said difference amplifier output signal and providing an output signal indicative of the peaks of the received difference amplifier output signal, and integrator means for receiving said envelope detector meAns output signal and providing said feedback signal having a rate of increase within a predetermined limit, and providing an output signal proportional to the difference in the rates of change of said received envelope detector means output signal and said feedback signal, said detecting means providing an output signal only if the rate of increase in amplitude of said electrical signal exceeds a predetermined rate.
Claim 2
Dependent Claim
134 words
A detector system comprising: signal generating means for generating an electrical signal; and detecting means having a difference amplifier for receiving both said electrical signal and a feedback signal and providing an output signal, envelope detector means for receiving said difference amplifier output signal and providing an output signal indicative of the peaks of the received difference amplifier output signal, and integrator means for receiving said envelope detector meAns output signal and providing said feedback signal having a rate of increase within a predetermined limit, and providing an output signal proportional to the difference in the rates of change of said received envelope detector means output signal and said feedback signal, said detecting means providing an output signal only if the rate of increase in amplitude of said electrical signal exceeds a predetermined rate.
Claim 3
Dependent Claim
134 words
A detector system comprising: signal generating means for generating an electrical signal; and detecting means having a difference amplifier for receiving both said electrical signal and a feedback signal and providing an output signal, envelope detector means for receiving said difference amplifier output signal and providing an output signal indicative of the peaks of the received difference amplifier output signal, and integrator means for receiving said envelope detector meAns output signal and providing said feedback signal having a rate of increase within a predetermined limit, and providing an output signal proportional to the difference in the rates of change of said received envelope detector means output signal and said feedback signal, said detecting means providing an output signal only if the rate of increase in amplitude of said electrical signal exceeds a predetermined rate.
Claim 4
Dependent Claim
134 words
A detector system comprising: signal generating means for generating an electrical signal; and detecting means having a difference amplifier for receiving both said electrical signal and a feedback signal and providing an output signal, envelope detector means for receiving said difference amplifier output signal and providing an output signal indicative of the peaks of the received difference amplifier output signal, and integrator means for receiving said envelope detector meAns output signal and providing said feedback signal having a rate of increase within a predetermined limit, and providing an output signal proportional to the difference in the rates of change of said received envelope detector means output signal and said feedback signal, said detecting means providing an output signal only if the rate of increase in amplitude of said electrical signal exceeds a predetermined rate.
Claim 5
Dependent Claim
82 words
A detector system according to claim 1 wherein said integrator means further comprises: resistor means connected at one end for receiving said envelope detector means output signal; capacitor means having one side connected to the other end of said resistor means; and field effect transistor means having a gate connected to the junction of said resistor means and capacitor means, a source connected to ground, and a drain connected to said one side of said capacitor means for providing said feedback signal.
Claim 6
Dependent Claim
37 words
A detector system according to claim 2 wherein said signal generating means further comprises: a microphone for detecting an acoustic signal and providing said electrical signal of a frequency and amplitude indicative of the acoustic signal detected.
Claim 7
Dependent Claim
127 words
A radio transmission system comprising: transducer means for detecting sound and providing a first signal indicative of the amplitude and frequency of the sound; circuit means for receiving said first signal and providing a second signal of constant rate-increasing amplitude when the rate of increase of the amplitude of said first signal exceeds a predetermined rate and providing a third signal indicative of the frequency of said first signal and the amount the rate of increase of amplitude of said first signal exceeds a predetermined rate of increase; control means for receiving said second signal and providing power at a predetermined level of said received signal; and transmitter means for receiving said third signal and said power and providing an r.f. output signal indicative of the sound.
Claim 8
Dependent Claim
127 words
A radio transmission system comprising: transducer means for detecting sound and providing a first signal indicative of the amplitude and frequency of the sound; circuit means for receiving said first signal and providing a second signal of constant rate-increasing amplitude when the rate of increase of the amplitude of said first signal exceeds a predetermined rate and providing a third signal indicative of the frequency of said first signal and the amount the rate of increase of amplitude of said first signal exceeds a predetermined rate of increase; control means for receiving said second signal and providing power at a predetermined level of said received signal; and transmitter means for receiving said third signal and said power and providing an r.f. output signal indicative of the sound.
Claim 9
Dependent Claim
135 words
A radio transmission system according to claim 4 wherein said circuit means further comprises: a difference amplifier for receiving said first signal and a feedback signal and providing said third signal; detector means for receiving said third signal and providing an output signal indicative of the peaks of the received signal; first integrator means for receiving said detector means output signal and providing said feedback signal having a rate of increase within a predetermined limit, and an output signal proportional to the difference in the rates of change of said received signal and said feedback signal; a Schmitt trigger for receiving said first integrator means output signal and providing an output when the received signal exceeds a predetermined level; and second integrator means for receiving and integrating said trigger output and providing said second signal.
Claim 10
Dependent Claim
72 words
A radio transmission system according to claim 5 wherein said transmitter means further comprises: limiter means for receiving said third signal and providing an output signal indicative of the frequency and predetermined maximum amplitude of the received signal; modulator means for receiving the limiter means output signal and providing an r.f. output signal modulated in accordance with the received signal; and antenna means for receiving and transmitting said modulator means output signal.
Claim 11
Dependent Claim
36 words
A radio transmission system according to claim 6 wherein said control means further comprises: an electrical power source; and switching means for receiving said second signal and the output of said source for providing said power.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |