US4564954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise reduction circuit of synthetic speech generating apparatus
Assignee: Sharp Corp
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Filing: 1983-01-05
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Granted: 1986-01-14
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Expires: 2003-01-05
Abstract
Abstract A speech synthesizer may generate random sounds during die-down after power turn-off. To prevent such sound generation, the synthesizer clock circuit is grounded by an FET simultaneously with power turn-off.
Inventors
- 👤 Hiroshi Nittaya
- 👤 Kosuke Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:57
CPC Classifications
G; G04; G04G; G04G13/00; G10; G10L; G10L13/00; G10L13/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
A synthetic speech generating apparatus comprising: synthetic speech generator means including at least a speech synthesizer, a power amplifier, a logic circuit, and an oscillator for providing a fundamental clock signal; power supply means; interruption means for interrupting power to said speech generator means when speech generation is not being performed; and means for stopping said logic circuit by controlling and stopping the fundamental clock oscillator of said speech synthesizer before the logic circuit malfunctions due to a drop in power supply voltage when power to the synthetic speech generator means is interrupted.
Claim 2
Dependent Claim
93 words
A synthetic speech generating apparatus comprising: synthetic speech generator means including at least a speech synthesizer, a power amplifier, a logic circuit, and an oscillator for providing a fundamental clock signal; power supply means; interruption means for interrupting power to said speech generator means when speech generation is not being performed; and means for stopping said logic circuit by controlling and stopping the fundamental clock oscillator of said speech synthesizer before the logic circuit malfunctions due to a drop in power supply voltage when power to the synthetic speech generator means is interrupted.
Claim 3
Dependent Claim
28 words
A synthetic speech generator apparatus according to claim 1, wherein the stopping means is forcibly executed in relation to power supply interrupt commands to the synthetic speech generator.
Claim 4
Dependent Claim
49 words
A synthetic speech generation apparatus according to claim 1, wherein said oscillator comprises capacitors to establish an oscillation condition, the capacitance of one of these capacitors being set so that said oscillator will oscillate at a voltage higher than the voltage which causes a malfunction of said logic circuit.
Claim 5
Dependent Claim
24 words
A synthetic speech generating apparatus according to claim 3, wherein one of said capacitors is an adjustable semifixed type for enabling changes in capacitance.
Claim 6
Dependent Claim
26 words
A synthetic speech generating apparatus according to claim 2, wherein a single gate FET (field effect transistor) is provided as means for stopping said logic circuit.
References Cited (Backward Citations)
US4423290A
Cited
US4387269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |