Apparatus and method of broadcasting audible sound using ultrasonic sound as a carrier
First Claim
Patent Images
1. An apparatus, comprising:
- a unit amplitude modulating an ultrasonic signal with a square root of an information signal to produce a modulated signal; and
a projector coupled to said unit and projecting the modulated signal to a listener.
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Abstract
An ultrasonic sound source broadcasts an ultrasonic signal which is amplitude and/or frequency modulated with an information input signal originating from an information input source. If the signals are amplitude modulated, a square root function of the information input signal is produced prior to modulation. The modulated signal, which may be amplified, is then broadcast via a projector unit, whereupon an individual or group of individuals located in the broadcast region detect the audible sound.
70 Citations
21 Claims
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1. An apparatus, comprising:
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a unit amplitude modulating an ultrasonic signal with a square root of an information signal to produce a modulated signal; and a projector coupled to said unit and projecting the modulated signal to a listener. - View Dependent Claims (2, 3, 4)
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5. A method, comprising:
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modulating an ultrasonic signal with a square root of an information signal to produce a modulated signal; and projecting the modulated signal to a listener. - View Dependent Claims (6, 7, 8)
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9. An apparatus, comprising:
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a first modulator frequency modulating a first ultrasonic signal with a first input signal to produce a first modulated ultrasonic signal; a first ultrasonic signal source providing a second ultrasonic signal; and a broadcasting system, coupled to the first modulator and the ultrasonic signal source, broadcasting the first modulated ultrasonic signal and the second ultrasonic signal to a listener. - View Dependent Claims (10, 11)
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12. An apparatus, comprising:
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a first modulator frequency modulating a first ultrasonic signal with a first input signal to produce a first modulated ultrasonic signal; a first input sound source, coupled to the first modulator, outputting the first input signal; a first ultrasonic signal source providing a second ultrasonic signal; a second ultrasonic signal source, coupled to the first modulator, providing the first ultrasonic signal; a second modulator amplitude modulating the second ultrasonic signal with a second input signal to produce a second modulated signal; a second input sound source, coupled to the second modulator, outputting the second input signal; an amplifier, coupled to an output of the second modulator, amplifying the amplitude modulated signal; and a broadcasting system, coupled to the first modulator and the ultrasonic signal source, broadcasting the first modulated ultrasonic signal and the second ultrasonic signal to a listener. - View Dependent Claims (13, 14, 15)
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16. A method, comprising:
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frequency modulating a first ultrasonic signal with a first input signal to produce a first modulated signal; providing a second ultrasonic signal; and broadcasting the first modulated signal and the second ultrasonic signal to a listener.
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17. A method, comprising:
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frequency modulating a first ultrasonic signal with a first input signal to produce a first modulated signal; providing a second ultrasonic signal; amplitude modulating the second ultrasonic signal with a second input signal to produce a second modulated signal; and amplifying the amplitude modulated signal; and broadcasting the first modulated signal and the second ultrasonic signal to a listener. - View Dependent Claims (18)
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19. An apparatus for broadcasting an audible sound using an ultrasonic sound as a carrier such that at least one person exposed to the ultrasonic sound can hear the audible sound, without detecting the source of the sound, comprising:
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an information sound source outputting an information signal; an ultrasonic sound source outputting the ultrasonic sound; a square root circuit, coupled to the sound source, producing a square root of the information signal output by the information sound source; an ultrasonic modulator, coupled to the square root circuit and the ultrasonic sound source, amplitude modulating the ultrasonic sound with the square root of the information signal to produce a modulated signal; an amplifier, coupled to the ultrasonic modulator, amplifying the modulated signal; and a projector unit, coupled to the amplifier, projecting the modulated signal such that the audible signal is detected by the at least one person.
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20. An apparatus for broadcasting first and second audible sounds using first and second ultrasonic sounds, respectively, as a carrier such that at least one person exposed to the ultrasonic sounds can hear the audible sounds, without detecting the source of the sounds, comprising:
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a first information sound source outputting a first information signal; a second information sound source outputting a second information signal; a first ultrasonic sound source outputting a first ultrasonic signal; a second ultrasonic sound source outputting a second ultrasonic signal; a first modulator, coupled to the first ultrasonic sound source and the first information sound source, frequency modulating the first ultrasonic signal with the first information signal to produce a first modulated signal; a second modulator, coupled to the second ultrasonic sound source and the square root circuit, frequency modulating the second ultrasonic sound with the second information signal to produce a second modulated signal; a first projector unit, coupled to the first modulator, projecting the first modulated signal to the at least one person; and a second projector unit, coupled to the second modulator, projecting the second modulated signal to the at least one person.
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21. An apparatus, comprising:
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a unit modulating an ultrasonic signal with the square root of an information signal to produce a modulated signal in which the information signal is intelligible to a listener; and a projector coupled to the unit and projecting the modulated signal to the listener.
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Specification