Apparatus and method for detecting tornadoes
First Claim
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1. A method of detecting tornadoes, comprising the steps of:
- sensing the presence of sound in air having a frequency of about one hertz and providing a sound sense signal in response thereto; and
generating an alarm signal in response to said sound sense signal.
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Abstract
A tornado detector comprising a sensor (30) for sensing the presence of sound having a frequency of about one hertz and for providing a sound sense signal in response thereto, a filter (50) to attenuate said sound sense signal wave components having frequencies greater than those which correspond to sound having a frequency of about one hertz, and an alarm (101) for generating an alarm signal in response to said filtered sound sense signal.
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Citations
28 Claims
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1. A method of detecting tornadoes, comprising the steps of:
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sensing the presence of sound in air having a frequency of about one hertz and providing a sound sense signal in response thereto; and generating an alarm signal in response to said sound sense signal.
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2. A method of detecting tornadoes, comprising the steps of:
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sensing the presence of sound in air having a frequency of about one hertz and providing a sound sense signal in response thereto; bandpass filtering to attenuate said sound sense signal wave components having frequencies greater than those which correspond to sound having a frequency of about one hertz and to attenuate said sound sense signal wave components having frequencies less than those which correspond to sound having a frequency of about one hertz; and generating an alarm signal in response to said filtered sound sense signal.
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3. A method of detecting tornadoes, comprising the steps of:
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sensing the presence of sound in air having a frequency of about one hertz and providing a sound sense signal in response thereto; bandpass filtering to attenuate said sound sense signal wave components having frequencies greater than those which correspond to sound having a frequency of about one hertz and to attenuate said sound sense signal wave components having frequencies less than those which correspond to sound having a frequency of about one hertz; timing said filtered sound sense signal; and generating an alarm signal in response to said timed sound sense signal. - View Dependent Claims (4)
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5. A method of detecting tornadoes, comprising the steps of:
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sensing the presence of sound in air having a frequency of about one hertz and providing a sound sense signal in response thereto; amplifying said sound sense signal; bandpass filtering to attenuate said amplified sound sense signal wave components having frequencies greater than those which correspond to sound having a frequency of about one hertz and to attenuate said amplified sound sense signal wave components having frequencies less than those which correspond to sound having a frequency of about one hertz; producing a squared version of said filtered sound sense signal; counting responsive to said squared sound sense signal for providing a timed sound sense signal when a predetermined count is reached; latching in response to said timed sound sense signal; and generating an audible alarm signal in response to said latch signal. - View Dependent Claims (6, 7, 8)
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9. Apparatus for detecting tornadoes, comprising:
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a sensor for sensing the presence of sound in air having a frequency of about one hertz and for providing a sound sense signal in response thereto; and an alarm for generating an alarm signal in response to said sound sense signal.
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10. Apparatus for detecting tornadoes, comprising:
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a sensor for sensing the presence of sound in air having a frequency of about one hertz and for providing a sound sense signal in response thereto; and means for generating an alarm signal in response to said sound sense signal.
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11. Apparatus for detecting tornadoes, comprising:
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a sensor for sensing the presence of sound in air having a frequency of about one hertz and for providing a sound sense signal in response thereto; a bandpass filter to attenuate said sound sense signal wave components having frequencies greater than those which correspond to sound having a frequency of about one hertz and to attenuate said sound sense signal wave components having frequencies less than those which correspond to sound having a frequency of about one hertz; and an alarm for generating an alarm signal in response to said filtered sound sense signal.
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12. Apparatus for detecting tornadoes, comprising:
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a sensor for sensing the presence of sound in air having a frequency of about one hertz and for providing a sound sense signal in response thereto; means for bandpass filtering to attenuate said sound sense signal wave components having frequencies greater than those which correspond to sound having a frequency of about one hertz and to attenuate said sound sense signal wave components having frequencies less than those which correspond to sound having a frequency of about one hertz; and means for generating an alarm signal in response to said filtered sound sense signal.
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13. Apparatus for detecting tornadoes, comprising:
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a sensor for sensing the presence of sound in air having a frequency of about one hertz and for providing a sound sense signal in response thereto; a bandpass filter to attenuate said sound sense signal wave components having frequencies greater than those which correspond to sound having a frequency of about one hertz and to attenuate said sound sense signal wave components having frequencies less than those which correspond to sound having a frequency of about one hertz; a timer for timing said filtered sound sense signal; and an alarm for generating an alarm signal in response to said timed sound sense signal. - View Dependent Claims (14)
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15. Apparatus for detecting tornadoes, comprising:
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a sensor for sensing the presence of sound in air having a frequency of about one hertz and for providing a sound sense signal in response thereto; means for bandpass filtering to attenuate said sound sense signal wave components having frequencies greater than those which correspond to sound having a frequency of about one hertz and to attenuate said sound sense signal wave components having frequencies less than those which correspond to sound having a frequency of about one hertz; means for timing said filtered sound sense signal; and means for generating an alarm signal in response to said timed sound sense signal. - View Dependent Claims (16)
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17. Apparatus for detecting tornadoes, comprising:
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a sensor for sensing the presence of sound in air having a frequency of about one hertz and for providing a sound sense signal in response thereto; means for amplifying said sound sense signal; means for bandpass filtering to attenuate said amplified sound sense signal wave components having frequencies greater than those which correspond to sound having a frequency of about one hertz and to attenuate said amplified sound sense signal wave components having frequencies less than those which correspond to sound having a frequency of about one hertz; means for producing a squared version of said filtered sound sense signal; means for counting responsive to said squared sound sense signal for providing a timed sound sense signal when a predetermined count is reached; means for latching in response to said timed sound sense signal; and means for generating an audible alarm signal in response to said latch signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. Apparatus for detecting tornadoes, comprising:
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a sensor for sensing the presence of sound in air having a frequency of about one hertz and for providing a sound sense signal in response thereto; an amplifier for amplifying said sound sense signal; a bandpass filter to attenuate said amplified sound sense signal wave components having frequencies greater than those which correspond to sound having a frequency of about one hertz and to attenuate said amplified sound sense signal wave components having frequencies less than those which correspond to sound having a frequency of about one hertz; a clipper for producing a squared version of said filtered sound sense signal; a counter for counting responsive to said squared sound sense signal for providing a timed sound sense signal when a predetermined count is reached; a latch for latching in response to said timed sound sense signal; and an alarm for generating an audible alarm signal in response to said latch signal. - View Dependent Claims (26, 27, 28)
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Specification