US3924262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aural warning apparatus
Assignee: United States Department of the Navy
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Filing: 1974-12-02
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Granted: 1975-12-02
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Expires: 1994-12-02
Abstract
Abstract An aircraft aural warning device that provides a ''''beeping'''' tone when a first selected angle-of-attack is exceeded by the aircraft. When a second selected angle-of-attack is exceeded, the ''''beeping'''' tone changes to a higher pitch and frequency.
Inventors
- 👤 Lionel P Melancon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:10
CPC Classifications
G; G08; G08G; G08G5/00; G08G5/50; G08G5/53; G05; G05D; G05D1/00; G05D1/0055; G05D1/0066; G08G5/20; G08G5/21; G08G5/55
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
382 words
An aural angle-of-attack warning circuit utilizing an a-c signal from an angle-of-attack transducer on an aircraft, the amplitude of said a-c transducer signal being proportional to the angle-of-attack of said aircraft, comprising: a. first circuit means connected to receive said a-c signal for converting said a-c signal into a d-c signal proportional to said a-c signal''s amplitude; b. means for providing a first d-c reference voltage; c. first switch means having a first and second input and an output, said second input being connected to receive said first d-c reference voltage, said first input being connected to receive said d-c signal, said first switch means being ''''on'''' when the voltage level of said first d-c reference voltage exceeds the voltage level of said d-c signal, said first switch means being ''''off'''' when the voltage level of said d-c signal exceeds the voltage level of said first d-c reference voltage; d. means for providing a second d-c reference voltage, said second d-c voltage being greater in value than said first d-c voltage; e. second switch means having a first and second input and an output, said second input being connected to receive said second d-c reference voltage, said first input being connected to receive said d-c signal, said second switch means being ''''on'''' when the voltage level of said d-c signal exceeds the voltage level of said second d-c reference voltage, said second switch means being ''''off'''' when the voltage level of said second d-c reference signal exceeds the voltage level of said d-c signal; and f. second circuit means connected to said first and second switch means for generating a first tone burst aural driver signal when said first switch means is ''''off'''' and said second switch means is ''''off'''', for generating a second tone burst aural driver signal when said first switch means is ''''off'''' and said second switch means is ''''on,'''' and for generating no first or second tone burst aural driver signal when said first switch means is ''''on,'''' said first and second tone burst aural driver signals having a frequency of tone bursts as well as a tone frequency, said second tone burst aural driver signal having a greater frequency of tone bursts as well as a greater tone frequency than said first tone burst aural driver signAl.
Claim 2
Dependent Claim
382 words
An aural angle-of-attack warning circuit utilizing an a-c signal from an angle-of-attack transducer on an aircraft, the amplitude of said a-c transducer signal being proportional to the angle-of-attack of said aircraft, comprising: a. first circuit means connected to receive said a-c signal for converting said a-c signal into a d-c signal proportional to said a-c signal''s amplitude; b. means for providing a first d-c reference voltage; c. first switch means having a first and second input and an output, said second input being connected to receive said first d-c reference voltage, said first input being connected to receive said d-c signal, said first switch means being ''''on'''' when the voltage level of said first d-c reference voltage exceeds the voltage level of said d-c signal, said first switch means being ''''off'''' when the voltage level of said d-c signal exceeds the voltage level of said first d-c reference voltage; d. means for providing a second d-c reference voltage, said second d-c voltage being greater in value than said first d-c voltage; e. second switch means having a first and second input and an output, said second input being connected to receive said second d-c reference voltage, said first input being connected to receive said d-c signal, said second switch means being ''''on'''' when the voltage level of said d-c signal exceeds the voltage level of said second d-c reference voltage, said second switch means being ''''off'''' when the voltage level of said second d-c reference signal exceeds the voltage level of said d-c signal; and f. second circuit means connected to said first and second switch means for generating a first tone burst aural driver signal when said first switch means is ''''off'''' and said second switch means is ''''off'''', for generating a second tone burst aural driver signal when said first switch means is ''''off'''' and said second switch means is ''''on,'''' and for generating no first or second tone burst aural driver signal when said first switch means is ''''on,'''' said first and second tone burst aural driver signals having a frequency of tone bursts as well as a tone frequency, said second tone burst aural driver signal having a greater frequency of tone bursts as well as a greater tone frequency than said first tone burst aural driver signAl.
Claim 3
Dependent Claim
268 words
The circuit of claim 1 wherein said second circuit means comprises: a. third circuit means connected to said first and second switch means for generating a first half-wave rectified a-c oscillator signal when said first switch means is ''''off'''' and said second switch means is ''''off'''', for generating a second half-wave rectified a-c oscillator signal when said first switch means is ''''off'''' and said second switch means is ''''on'''', and for generating no signal when said first switch means is ''''on'''', said second half-wave rectified a-c oscillator signal having a higher frequency than said first half-wave rectified a-c oscillator signal, said first and second half-wave rectified a-c oscillator signals setting said frequency of tone bursts, said third circuit means having an output upon which said first or second half-wave rectified a-c signal appears; and b. fourth circuit means being connected to said second switch means and to said third circuit means output at a first input for generating a first tone burst aural driver signal when said first half-wave rectified a-c oscillator signal appears on said first input and said second switch means if ''''off'''', for generating a second tone burst aural driver signal when said second half-wave rectified a-c oscillator signal appears on said first input and said second switch means is ''''off'''', and for generating no first or second tone burst aural driver signal when no first or second a-c half-wave rectified oscillator signals appear on said first input, said second tone burst aural driver signal having a higher tone frequency and a higher frequency of tone bursts than said first tone burst aural driver signal.
Claim 4
Dependent Claim
129 words
The circuit of claim 2 wherein said third circuit means comprises: a. an interruption oscillator connected to said first and second switch means generating a first a-c oscillator signal when said first switch means is ''''off'''' and said second switch means is ''''off'''', generating a second a-c oscillator signal when said first switch means is ''''off'''' and said second switch means is ''''on'''', and generating no first or second a-c oscillator signal when said first switch means is ''''on'''', said second a-c oscillator signal being higher in frequency than said first a-c oscillator signal; and b. a first diode connected to receive said first or second a-c oscillator signal, said first diode having an output upon which appears either said first or said second half-wave rectified a-c oscillator signal.
Claim 5
Dependent Claim
249 words
The circuit of claim 3 wherein said interruption oscillator includes: a. a first inverting amplifier having an input and an output, said first inverting amplifier input being connected to said first switch means; b. a first resistance network being connected between said first inverting amplifier input and said first inverting amplifier output; c. a second inverting amplifier having an input and an output, said second inverting amplifier input being connected to said first inverting amplifier output, said first or second a-c oscillator signal appearing on said second inverting amplifier output; d. a first capacitance circuit being connected between said first inverting amplifier input and said second inverting amplifier output; e. a third inverting amplifier having an input and an output, said third inverting amplifier input being connected to said second switch means; f. a second capacitance circuit being connected between said first inverting amplifier input and said third inverting amplifier output; and g. a second resistance network being connected between said first inverting amplifier output and said third inverting amplifier input, said second capacitance circuit being electrically removed from said interruption oscillator circuit whenever said first switch means is ''''off'''' and said second switch means is ''''on'''' whereby said first resistance network and said first and second capacitance circuit Determine the time constant for the frequency of oscillation of said first a-c oscillator signal and said first resistance network and said first capacitance circuit determine the time constant for the frequency of oscillation of said second a-c oscillator signal.
Claim 6
Dependent Claim
98 words
The circuit of claim 2 wherein said fourth circuit means comprises: a. an oscillator circuit being connected to said second switch means and said third circuit means output, said oscillator circuit having a first and a second output; and b. a first operational amplifier having a positive and a negative input and an output, said first operational amplifier positive input being connected to said second oscillator circuit output, said first operational amplifier negative input being connected to said first oscillator circuit output, said first or second tone burst aural driver signal appearing on said first operational amplifier output.
Claim 7
Dependent Claim
266 words
The circuit of claim 5 wherein said oscillator circuit comprises: a. a fourth inverting amplifier having an input or an output, said fourth inverting amplifier being connected to receive on its input either said first or second half-wave rectified a-c oscillator signal on said third circuit means output, said fourth inverting amplifier output being said first output of said oscillator circuit; b. a fifth inverting amplifier having an input and an output, said fifth inverting amplifier input being connected to said fourth inverting amplifier output, said fifth inverting amplifier output being said second output of said oscillator circuit; c. a sixth inverting amplifier having an input and an output, said sixth inverting amplifier input being connected to said second switch means; d. a third resistor network being connected between said fourth inverting amplifier input and output; e. a fourth resistor network being connected between said fifth inverting amplifier input and said sixth inverting amplifier input; f. a third capacitor network being connected between said fourth inverting amplifier input and said fifth inverting amplifier output; and g. a fourth capacitor network being connected between said fourth inverting amplifier input and said sixth inverting amplifier output, said fourth capacitor network being electrically removed from said oscillator circuit whenever said second switch means is ''''on'''', whereby said third resistor network and said third and fourth capacitor network determine the time constant for the tone frequency of said first tone burst aural driver signal and said third resistor network and said third capacitor network determine the time constant for the tone frequency of said second tone burst aural driver signal.
Claim 8
Dependent Claim
21 words
The circuit of claim 1 wherein said first circuit means comprises a phase demodulator circuit followed by a d-c smoothing filter.
Claim 9
Dependent Claim
23 words
The circuit of claim 1 further comprising an aural warning device connected to receive said first or second time burst aural driver signal.
Claim 10
Dependent Claim
82 words
The circuit of claim 1 wherein said first switch means comprises: a. a second operational amplifier having a positive and a negative input and an output, said positive input being connected to receive said first d-c reference voltage, said negative input being connected to receive said d-c signal; and b. a second diode having an input and an output, said second diode input being connected to said second operational amplifier output, said second diode output being connected to said second circuit means.
Claim 11
Dependent Claim
82 words
The circuit of claim 1 wherein said second switch means comprises: a. a third operational amplifier having a positive and a negative input and an output, said positive input being connected to receive said d-c signal, said negative input being connected to receive said second d-c reference voltage; and b. a third diode having an input and an output, said third diode input being connected to said third operational amplifier output, said third diode output being connected to said sEcond circuit means.
Claim 12
Dependent Claim
129 words
A circuit capable of generating a first or second a-c signal in response to a first and second switch comprising: a. an oscillator circuit having an input and an output, said oscillator circuit having at least two parallel capacitance networks and at least one resistance network which together determine the time constant for the frequency of oscillation of said first a-c signal, said first a-c signal appearing on said oscillator circuit output when said first switch is ''''off'''' and said second switch is ''''off''''; and b. means connected to said oscillator circuit for electrically removing one of said capacitance networks from said oscillator circuit when said first switch is ''''off'''' and said second switch is ''''on'''', thereby causing said second a-c signal to appear on said oscillator circuit output.
Claim 13
Dependent Claim
129 words
A circuit capable of generating a first or second a-c signal in response to a first and second switch comprising: a. an oscillator circuit having an input and an output, said oscillator circuit having at least two parallel capacitance networks and at least one resistance network which together determine the time constant for the frequency of oscillation of said first a-c signal, said first a-c signal appearing on said oscillator circuit output when said first switch is ''''off'''' and said second switch is ''''off''''; and b. means connected to said oscillator circuit for electrically removing one of said capacitance networks from said oscillator circuit when said first switch is ''''off'''' and said second switch is ''''on'''', thereby causing said second a-c signal to appear on said oscillator circuit output.
Claim 14
Dependent Claim
157 words
The circuit of claim 11 wherein said oscillator circuit comprises: a. a first inverting amplifier having an input and an output, said first inverting amplifier output being connected to said first switch; c. a first resistance network being connected between said first inverting amplifier input and said first inverting amplifier output; d. a second inverting amplifier having an input and an output, said second inverting amplifier input being connected to said first inverting amplifier output, said first or second a-c signal appearing on said second inverting amplifier output; e. a first capacitance circuit being connected between said first inverting amplifier input and said second inverting amplifier output; f. a third inverting amplifier having an input and an output; g. a second capacitance circuit being connected between said first inverting amplifier input and said third inverting amplifier output; and h. a second resistance network being connected between said first inverting amplifier output and said third inverting amplifier input.
Claim 15
Dependent Claim
47 words
The circuit of claim 12 wherein said removing means comprises an electrical connection between said first switch and said third inverting amplifier input whereby when said first switch is ''''on'''', said third inverting amplifier is disabled, thereby electrically removing said second capacitance circuit from said oscillator circuit.
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) | 1978-12-01 | 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 |