US3924070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voice gated amplifier
Assignee: Webster Electric Co Inc
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Filing: 1970-03-16
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Granted: 1975-12-02
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Expires: 1990-03-16
Abstract
Abstract A voice gated amplifier includes a multi-stage amplifier having a signal path coupling the successive stages of the amplifier. A normally nonconductive field effect transistor placed in series relation with the signal path interrupts the signal path to maintain the amplifier in a standby, nonoperating state. In response to an input signal of predetermined magnitude, a gating circuit renders the field effect transistor abruptly conductive thereby to place the amplifier in an operating state.
Inventors
- 👤 F Harmon Seaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:27
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/72
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A voice gated, multi-stage amplifier having an input terminal to receive input signals and a signal path coupling the successive stages of the amplifier, said amplifier comprising: a normally nonconductive field effect transistor having a gate electrode, drain and source electrodes, and an interrupt circuit between said drain and source electrodes, said drain and source electrodes being coupled in series relation with the signal path so that said interrupt circuit normally interrupts the signal path and so that said interrupt circuit provides a variable impedance circuit between said drain and source electrodes. and a gating circuit coupling the gate electrode of said field effect transistor to the input terminal and rendering the field effect transistor conductive in response to an increase of the input signals above a predetermined amplitude so that said interrupt circuit does not interrupt the signal path.
Claim 2
Dependent Claim
140 words
A voice gated, multi-stage amplifier having an input terminal to receive input signals and a signal path coupling the successive stages of the amplifier, said amplifier comprising: a normally nonconductive field effect transistor having a gate electrode, drain and source electrodes, and an interrupt circuit between said drain and source electrodes, said drain and source electrodes being coupled in series relation with the signal path so that said interrupt circuit normally interrupts the signal path and so that said interrupt circuit provides a variable impedance circuit between said drain and source electrodes. and a gating circuit coupling the gate electrode of said field effect transistor to the input terminal and rendering the field effect transistor conductive in response to an increase of the input signals above a predetermined amplitude so that said interrupt circuit does not interrupt the signal path.
Claim 3
Dependent Claim
187 words
A voice gated, multi-stage amplifier having an input terminal to receive input signals and a signal path coupling the successive stages of the amplifier, said amplifier comprising: a normally nonconductive first controlled conduction means having a control electrode, a pair of output electrodes, and an interrupt circuit between said output electrodes, said output electrodes being coupled in series relation with the signal path so that said interrupt circuit normally interrupts the signal path; and a gating circuit coupling the control electrode of said first controlled conduction means to the input terminal and rendering the first controlled conduction means conductive in response to an increase of the input signals above a predetermined amplitude so that said interrupt circuit does not interrupt the signal path, said gating circuit including a signal responsive amplifier circuit to detect the increase of said input signals above the predetermined amplitude, a field effect transistor cOupling said signal responsive amplifier circuit to said input terminal and establishing a high input impedance for said gating circuit, and a second normally nonconductive conduction means coupling the signal responsive amplifier circuit to the first controlled conduction means.
Claim 4
Dependent Claim
187 words
A voice gated, multi-stage amplifier having an input terminal to receive input signals and a signal path coupling the successive stages of the amplifier, said amplifier comprising: a normally nonconductive first controlled conduction means having a control electrode, a pair of output electrodes, and an interrupt circuit between said output electrodes, said output electrodes being coupled in series relation with the signal path so that said interrupt circuit normally interrupts the signal path; and a gating circuit coupling the control electrode of said first controlled conduction means to the input terminal and rendering the first controlled conduction means conductive in response to an increase of the input signals above a predetermined amplitude so that said interrupt circuit does not interrupt the signal path, said gating circuit including a signal responsive amplifier circuit to detect the increase of said input signals above the predetermined amplitude, a field effect transistor cOupling said signal responsive amplifier circuit to said input terminal and establishing a high input impedance for said gating circuit, and a second normally nonconductive conduction means coupling the signal responsive amplifier circuit to the first controlled conduction means.
Claim 5
Dependent Claim
132 words
A voice gated amplifier having at least first and second stages, an input terminal to receive input signals, and a signal path coupling said first and second stages of the amplifier, said amplifier comprising: a field effect transistor having a gate electrode, a drain electrode , a source electrode, and an interrupt circuit between said drain and source electrodes, said interrupt circuit being coupled in series relation with the signal path and operable to two different states so that said interrupt circuit provides a variable impedance circuit between said drain and source electrodes, and a gating circuit coupling the gate electrode of the field effect transistor to the input terminal and selectively altering the state of the interrupt circuit in response to an increase of the input signals above a predetermined amplitude.
Claim 6
Dependent Claim
132 words
A voice gated amplifier having at least first and second stages, an input terminal to receive input signals, and a signal path coupling said first and second stages of the amplifier, said amplifier comprising: a field effect transistor having a gate electrode, a drain electrode , a source electrode, and an interrupt circuit between said drain and source electrodes, said interrupt circuit being coupled in series relation with the signal path and operable to two different states so that said interrupt circuit provides a variable impedance circuit between said drain and source electrodes, and a gating circuit coupling the gate electrode of the field effect transistor to the input terminal and selectively altering the state of the interrupt circuit in response to an increase of the input signals above a predetermined amplitude.
Claim 7
Dependent Claim
208 words
A voice gated amplifier having at least first and second stages, an input terminal to receive input signals, and a signal path coupling said first and second stages of the amplifier, said amplifier comprising: a first controlled conduction means having a control electrode, first and second output electrodes, and an interrupt circuit between said first and second output electrodes, said interrupt circuit being coupled in series relation with the signal path and operable to two different states, and a gating circuit coupling the control electrode of the first controlled conduction means to the input terminal and selectively altering the state of the interrupt circuit in response to an increase of the input signals above a predetermined amplitude, said gating circuit including a signal responsive amplifier circuit supplying a control output signal in response to increases of said input signal above the predetermined amplitude, a field effect transistor coupling said signal responsive amplifier circuit to said input terminal, and a second normally nonconductive controlled conduction means coupled between the signal responsive amplifier circuit and the first controlled conduction means, said second controlled conduction means altering the state of said first controlled conduction means when said second controlled conduction means is rendered conductive in response to said control output signal.
Claim 8
Dependent Claim
208 words
A voice gated amplifier having at least first and second stages, an input terminal to receive input signals, and a signal path coupling said first and second stages of the amplifier, said amplifier comprising: a first controlled conduction means having a control electrode, first and second output electrodes, and an interrupt circuit between said first and second output electrodes, said interrupt circuit being coupled in series relation with the signal path and operable to two different states, and a gating circuit coupling the control electrode of the first controlled conduction means to the input terminal and selectively altering the state of the interrupt circuit in response to an increase of the input signals above a predetermined amplitude, said gating circuit including a signal responsive amplifier circuit supplying a control output signal in response to increases of said input signal above the predetermined amplitude, a field effect transistor coupling said signal responsive amplifier circuit to said input terminal, and a second normally nonconductive controlled conduction means coupled between the signal responsive amplifier circuit and the first controlled conduction means, said second controlled conduction means altering the state of said first controlled conduction means when said second controlled conduction means is rendered conductive in response to said control output signal.
Claim 9
Dependent Claim
24 words
A voice gated amplifier as set forth in claim 4 wherein the field effect transistor provides a high input impedance for the gating circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |