Patent ID: 6914991
Filing Date: 2005-07-05
Classification: H04R

Abstract:
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.