US3781692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching circuit apparatus
Assignee: Collins Radio Co
•
Filing: 1973-04-30
•
Granted: 1973-12-25
•
Expires: 1993-04-30
Abstract
Abstract A circuit for detecting a burst of single frequency waveforms of a precise time duration from an input providing a wide frequency range of signals and providing an output of that time duration. A slope polarity detecting switch of simple design lies at the heart of the circuit.
Inventors
- 👤 R Escoffier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:25
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/08; H03K5/082
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
180 words
Switching circuit apparatus for switching at the commencement of both rising and falling input signal amplitude comprising, in combination: differential amplifier means including first and second input means and output means; signal input supplying means; unidirectional means having first and second terminals for allowing current flow in only one direction therethrough; means connecting said first terminal and said signal input supplying means to said first input means of said differential amplifier means; ground means; voltage reference means for supplying a voltage with respect to said ground means; time delay means; means connecting said second terminal directly to said voltage reference means, to said time delay means and to said second input means of said differential amplifier means, signal amplitude changes at said first input means being generally followed, but lagging, at said second input means for switching at the same prescribed lag after commencement of both rising and falling input signal amplitudes whereby switching signals appearing at said output means of said amplifier means occur when the relative polarity of signals appearing across said first and second input means changes.
Claim 2
Dependent Claim
180 words
Switching circuit apparatus for switching at the commencement of both rising and falling input signal amplitude comprising, in combination: differential amplifier means including first and second input means and output means; signal input supplying means; unidirectional means having first and second terminals for allowing current flow in only one direction therethrough; means connecting said first terminal and said signal input supplying means to said first input means of said differential amplifier means; ground means; voltage reference means for supplying a voltage with respect to said ground means; time delay means; means connecting said second terminal directly to said voltage reference means, to said time delay means and to said second input means of said differential amplifier means, signal amplitude changes at said first input means being generally followed, but lagging, at said second input means for switching at the same prescribed lag after commencement of both rising and falling input signal amplitudes whereby switching signals appearing at said output means of said amplifier means occur when the relative polarity of signals appearing across said first and second input means changes.
Claim 3
Dependent Claim
26 words
Switching apparatus as claimed in claim 1 wherein said time delay means comprises resistance means and a capacitance means; and said unidirectional means comprises a diode.
Claim 4
Dependent Claim
159 words
Specific frequency tone burst detection apparatus comprising, in combination: input means for supplying a plurality of signal frequencies including signal bursts of a specific tone to be detected; filter means, connected to said input means, having a frequency characteristic designed for passing only signals on the specific tone to be detected; rectifier means, connected to said filter means for receiving signals therefrom of the specific tone wherein the waveform thereof is modified in accordance with the delay characteristics of the filter means, said rectifier means providing as an output a voltage waveform representative of the envelope of the signal received from said filter means; switching amplifier means, including input means and output means, the output means of said amplifier means switching in electrical signal amplitude upon a reversal in signal input slope amplitude by more than a predetermined amount; and means connecting said rectifier means to said input means of said amplifier means for supplying the rectified signal thereto.
Claim 5
Dependent Claim
159 words
Specific frequency tone burst detection apparatus comprising, in combination: input means for supplying a plurality of signal frequencies including signal bursts of a specific tone to be detected; filter means, connected to said input means, having a frequency characteristic designed for passing only signals on the specific tone to be detected; rectifier means, connected to said filter means for receiving signals therefrom of the specific tone wherein the waveform thereof is modified in accordance with the delay characteristics of the filter means, said rectifier means providing as an output a voltage waveform representative of the envelope of the signal received from said filter means; switching amplifier means, including input means and output means, the output means of said amplifier means switching in electrical signal amplitude upon a reversal in signal input slope amplitude by more than a predetermined amount; and means connecting said rectifier means to said input means of said amplifier means for supplying the rectified signal thereto.
Claim 6
Dependent Claim
73 words
Apparatus as claimed in claim 3 wherein the last named means comprises, in combination: reference source means; R-C time delay means connected to said reference source means; diode means connected to said delay means and to said amplifier means; and said above named means providing first and second signals to said input means of said amplifier means whereby the amplitude change of said second signal lags the amplitude change of said first signal.
References Cited (Backward Citations)
US3437941A
Cited
US3571522A
Cited
US3584310A
Cited
US3548206A
Cited
US3638183A
Cited
US3652805A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |