US3925733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Maximum pulse density detector
Assignee: United States Department of the Navy
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Filing: 1974-05-24
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Granted: 1975-12-09
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Expires: 1994-05-24
Abstract
Abstract An improved electronic circuit and technique for providing a trigger pulse synchronized with the maximum pulse density in a random pulse train. A frequency modulated pulse train having uniform amplitude pulses is delivered to an RC circuit which provides an output waveform having maximum amplitude at the highest input frequency or maximum pulse density. The waveform is passed through a smoothing filter and amplifier to more particularly define the waveform peak, and then to a peak detector where the point of maximum amplitude is sensed using a transistor sensing circuit. A pulse output from the transistor sensing circuit is electronically modified to produce an impulse trigger spike that corresponds to the point of maximum pulse density over a wide range of input conditions.
Inventors
- 👤 Wayne E Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:07
CPC Classifications
H; H03; H03K; H03K11/00; H03K5/00; H03K5/153; H03K5/1532
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
103 words
An improved circuit for providing a trigger pulse synchronous with the maximum pulse density in a frequency modulated pulse train comprising: means for providing a frequency modulated pulse train having periods of maximum pulse density; means for forming a waveform from said pulse train, said waveform having an amplitude proportional to the frequency of said pulse train; means coupled to said forming means for defining peak amplitudes of said waveform; means coupled to said defining means for sensing the peak amplitudes of said waveform; and means responsive to said sensing means for providing a trigger pulse upon the sensing of a peak amplitude.
Claim 2
Dependent Claim
103 words
An improved circuit for providing a trigger pulse synchronous with the maximum pulse density in a frequency modulated pulse train comprising: means for providing a frequency modulated pulse train having periods of maximum pulse density; means for forming a waveform from said pulse train, said waveform having an amplitude proportional to the frequency of said pulse train; means coupled to said forming means for defining peak amplitudes of said waveform; means coupled to said defining means for sensing the peak amplitudes of said waveform; and means responsive to said sensing means for providing a trigger pulse upon the sensing of a peak amplitude.
Claim 3
Dependent Claim
22 words
The circuit of claim 1 wherein said providing means provides a random frequency pulse train having pulses of uniform amplitude and width.
Claim 4
Dependent Claim
33 words
The circuit of claim 2 wherein said means for forming comprises a resistor-capacitor integrating network connected to receive the pulse train and provide an envelope output whose amplitude increases with increases in frequency.
Claim 5
Dependent Claim
26 words
The circuit of claim 3 wherein said defining means comprises a low-pass filter and amplifier connected to receive said waveform to smooth and amplify said peaks.
Claim 6
Dependent Claim
29 words
The circuit of claim 4 wherein said sensing means comprises a transistor connected to provide a pulse output having a trailing edge corresponding to eack peak of said waveform.
Claim 7
Dependent Claim
83 words
The circuit of claim 5 wherein said trigger providing means comprises: a first transistor connected to receive said pulse output and form a square wave pulse corresponding in period to said pulse output; a second transistor connected to receive said square wave pulse and provide an inverted square wave output; a differentiating circuit connected to receive said inverted output and provide a voltage impulse from the trailing edge of said inverted square wave, and; an emitter follower connected to pass said voltage impulse.
Claim 8
Dependent Claim
42 words
The circuit of claim 5 wherein said transistor has its base coupled to receive said waveform and its collector and emitter biased to provide said trailing edge pulse output when the amplitude of the waveform at the base reaches a peak value.
Claim 9
Dependent Claim
78 words
A pulse density trigger circuit comprising: means for providing a frequency modulated pulse train having periods of maximum pulse density; means responsive to said pulse train for providing an output waveform having points of maximum amplitude at times of maximum pulse density; means for sensing the points of maximum amplitude of said waveform; and means responsive to said sensing means For providing a trigger pulse substantially corresponding in time to each point of maximum amplitude of said waveform.
Claim 10
Dependent Claim
78 words
A pulse density trigger circuit comprising: means for providing a frequency modulated pulse train having periods of maximum pulse density; means responsive to said pulse train for providing an output waveform having points of maximum amplitude at times of maximum pulse density; means for sensing the points of maximum amplitude of said waveform; and means responsive to said sensing means For providing a trigger pulse substantially corresponding in time to each point of maximum amplitude of said waveform.
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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |