US3947699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for selecting a predetermined portion of an analog signal and gating it to an output
Assignee: Iowa State University Research Foundation Inc
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Filing: 1974-08-29
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Granted: 1976-03-30
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Expires: 1994-08-29
Abstract
Abstract An input signal is fed to one signal lead of a gate or switch and, at the same time, to circuitry for initiating and terminating the conduction period of the gate. A bistable circuit is controlled by the initiation and termination circuitry, and it feeds the control lead of the gate to couple a predetermined portion of the input analog signal to an output. The initiation and termination circuitry provides for independent selection of the polarity of the slope and the amplitude of the incoming waveform in defining the start and end points on the incoming waveform for coupling to the output.
Inventors
- 👤 Delbert O. Whitmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:46
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/0215
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
269 words
Apparatus for selecting a predetermined portion of an input signal and for coupling said portion to an output while controlling the length of the selected portion comprising: controlled gate circuit means having a first signal terminal connected to receive said input signal, a second signal terminal connected to said output for coupling a selected portion of said input signal thereto, and a control terminal; initiation circuit means responsive to said input signal for generating a start signal including first comparator circuit means having first and second inputs, first settable circuit means for generating a first reference voltage of predetermined magnitude and polarity, first slope polarity selection circuit means for coupling said first reference voltage and said input signal to said first and second inputs of said first comparator circuit means; termination circuit means for generating a termination signal including second comparator circuit means having first and second inputs, second settable circuit means for generating a second reference voltage of predetermined magnitude and polarity, second slope polarity selection circuit means for coupling said second reference voltage and said input signal to said first and second inputs of said second comparator circuit means; and bistable circuit means responsive to said start signal and said termination signal and feeding the control terminal of said switch means for causing said switch means to conduct in response to said start signal and for causing said switch to open in response to said termination signal; whereby said start and termination signals may be set to occur independently either on a positive or a negative slope of said input signal and at a desired voltage level.
Claim 2
Dependent Claim
269 words
Apparatus for selecting a predetermined portion of an input signal and for coupling said portion to an output while controlling the length of the selected portion comprising: controlled gate circuit means having a first signal terminal connected to receive said input signal, a second signal terminal connected to said output for coupling a selected portion of said input signal thereto, and a control terminal; initiation circuit means responsive to said input signal for generating a start signal including first comparator circuit means having first and second inputs, first settable circuit means for generating a first reference voltage of predetermined magnitude and polarity, first slope polarity selection circuit means for coupling said first reference voltage and said input signal to said first and second inputs of said first comparator circuit means; termination circuit means for generating a termination signal including second comparator circuit means having first and second inputs, second settable circuit means for generating a second reference voltage of predetermined magnitude and polarity, second slope polarity selection circuit means for coupling said second reference voltage and said input signal to said first and second inputs of said second comparator circuit means; and bistable circuit means responsive to said start signal and said termination signal and feeding the control terminal of said switch means for causing said switch means to conduct in response to said start signal and for causing said switch to open in response to said termination signal; whereby said start and termination signals may be set to occur independently either on a positive or a negative slope of said input signal and at a desired voltage level.
Claim 3
Dependent Claim
42 words
The system of claim 1 wherein said bistable circuit means includes a capacitor in series with each input terminal whereby said bistable circuit means changes state only in response to changes in the outputs of said first and second comparator circuit means.
Claim 4
Dependent Claim
43 words
The apparatus of claim 1 wherein said switch means comprises a switching transistor and operational amplifier means having said transistor connected in circuit with one input terminal thereof and including resistive feedback means connected between said one input terminal and said output terminal.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |