Parametric audio amplifier system
First Claim
1. A parametric audio amplifier system, comprising:
- at least one amplifier assembly including at least one amplifier, and a damping resistance having first and second terminals, the amplifier being configured to receive an ultrasonic signal modulated with an audio signal, and to amplify the modulated ultrasonic signal, the damping resistance being configured to receive the amplified ultrasonic signal at its first terminal, and to provide the ultrasonic signal at its second terminal; and
at least one acoustic transducer assembly including a bias generator, at least one acoustic transducer, and at least one component interfacing the amplifier assembly and the acoustic transducer, the interface component being configured to receive the ultrasonic signal provided at the second terminal of the damping resistance, and to provide a drive signal corresponding to the ultrasonic signal to the acoustic transducer, the bias generator being configured to generate a bias level, and to provide the bias level to the acoustic transducer, and the acoustic transducer being configured to receive the drive signal and the bias level, to generate a sonic beam corresponding to the drive signal and the bias level, and to project the sonic beam through the air to regenerate the audio signal.
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Abstract
A smaller, less expensive, parametric audio amplifier system configured to be conformable to cable routing requirements that are no more stringent than that of conventional loudspeaker systems. The parametric audio amplifier system includes an amplifier assembly for amplifying an ultrasonic carrier signal modulated with a processed audio signal, an acoustic transducer assembly for projecting a sonic beam corresponding to the amplified ultrasonic signal through the air to regenerate the audio signal, and a low voltage connection for carrying the amplified ultrasonic signal from the amplifier assembly to the acoustic transducer assembly. The amplifier assembly includes an amplifier for receiving the modulated ultrasonic signal and generating an amplified ultrasonic signal having a low voltage level, and a voltage source for generating a voltage level. The acoustic transducer assembly includes interface circuitry for receiving the amplified ultrasonic signal, and providing a drive signal to an acoustic transducer. The acoustic transducer assembly further includes a bias generator for receiving the voltage level, and providing a bias level to the acoustic transducer.
52 Citations
21 Claims
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1. A parametric audio amplifier system, comprising:
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at least one amplifier assembly including at least one amplifier, and a damping resistance having first and second terminals, the amplifier being configured to receive an ultrasonic signal modulated with an audio signal, and to amplify the modulated ultrasonic signal, the damping resistance being configured to receive the amplified ultrasonic signal at its first terminal, and to provide the ultrasonic signal at its second terminal; and
at least one acoustic transducer assembly including a bias generator, at least one acoustic transducer, and at least one component interfacing the amplifier assembly and the acoustic transducer, the interface component being configured to receive the ultrasonic signal provided at the second terminal of the damping resistance, and to provide a drive signal corresponding to the ultrasonic signal to the acoustic transducer, the bias generator being configured to generate a bias level, and to provide the bias level to the acoustic transducer, and the acoustic transducer being configured to receive the drive signal and the bias level, to generate a sonic beam corresponding to the drive signal and the bias level, and to project the sonic beam through the air to regenerate the audio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of operating a parametric audio amplifier system, comprising the steps of:
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receiving an ultrasonic signal modulated with an audio signal by an amplifier;
amplifying the modulated ultrasonic signal by the amplifier;
receiving the amplified ultrasonic signal at a first terminal of a damping resistance;
providing the ultrasonic signal at a second terminal of the damping resistance;
providing the ultrasonic signal to an acoustic transducer assembly by a connection disposed between the second terminal of the damping resistance and the acoustic transducer assembly;
receiving the ultrasonic signal by at least one interface component included in the acoustic transducer assembly;
providing a drive signal corresponding to the ultrasonic signal to at least one acoustic transducer included in the acoustic transducer assembly by the interface component;
providing a bias level to the acoustic transducer by a bias generator included in the acoustic transducer assembly;
receiving the drive signal and the bias level by the acoustic transducer; and
generating a sonic beam corresponding to the drive signal and the bias level by the acoustic transducer. - View Dependent Claims (20, 21)
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Specification