Technique and device for through-the-wall audio surveillance
First Claim
Patent Images
1. A device for detecting audible sound, comprising:
- an RF transmitter configured to generate an RF signal having a frequency of at least 100 MHz and an unmodulated amplitude;
an RF receiver configured to receive a reflected RF signal comprising an RF carrier having the same frequency as the generated RF signal that is amplitude modulated by an information signal; and
a signal processor configured to extract audio frequency information from the amplitude of the reflected RF signal.
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Abstract
Systems and methods are disclosed for detecting audible sound and/or the vibration of objects. Embodiments of the present invention are able to detect sound and other vibrations through barriers. One embodiment of the invention includes an RF transmitter configured to generate an RF signal having a frequency of at least 100 MHz and an unmodulated amplitude, an RF receiver configured to receive a reflected RF signal comprising an RF carrier having the same frequency as the generated RF signal that is amplitude modulated by an information signal and a signal processor configured to extract audio frequency information from the amplitude of the reflected RF signal.
28 Citations
18 Claims
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1. A device for detecting audible sound, comprising:
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an RF transmitter configured to generate an RF signal having a frequency of at least 100 MHz and an unmodulated amplitude;
an RF receiver configured to receive a reflected RF signal comprising an RF carrier having the same frequency as the generated RF signal that is amplitude modulated by an information signal; and
a signal processor configured to extract audio frequency information from the amplitude of the reflected RF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of reproducing an audible sound, comprising:
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illuminating an object with a generated RF signal having a frequency of at least 100 MHz and having an unmodulated amplitude;
extracting amplitude modulated information from reflections of the generated RF signal;
isolating the portions of the extracted information corresponding to audio frequencies; and
generating audio using the isolated portions of the extracted information. - View Dependent Claims (14, 15, 16)
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17. A system for determining the frequency with which an object vibrates, comprising:
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means for generating an RF signal having a frequency of at least 100 MHz;
means for receiving reflections of the RF signal reflected by the object; and
means for demodulating the received RF signal to extract a signal indicative of the frequency with which the object is vibrating. - View Dependent Claims (18)
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Specification