Parametric in-ear impedance matching device

摘要

An ultrasonic audio transducer system includes an ultrasonic speaker. The ultrasonic speaker may be an electrostatic emitter, a piezoelectric emitter (single crystal or stack), a piezoelectric film emitter, or any other emitter capable of emitting ultrasound. The ultrasonic speaker is configured to be coupled (via a wired or wireless connection) to an audio modulated ultrasonic carrier signal from an amplifier, wherein upon application of the audio modulated ultrasonic carrier signal, the ultrasonic speaker is configured to launch a pressure-wave representation of the audio modulated ultrasonic carrier signal into the air. Additionally, the ultrasonic speaker is implemented with an impedance matching element or optimized for matching the response within a user's ear canal.

主权项

1. An ultrasonic transducer system, comprising:
an ultrasonic emitter comprising at least one ultrasound transmitting layer coupled to a signal line carrying an audio modulated ultrasonic carrier signal, wherein upon application of the audio modulated ultrasonic carrier signal, the at least one ultrasound transmitting layer launches a pressure-wave representation of the audio modulated ultrasonic carrier signal into an ear canal of a user; and an impedance matching element disposed on the ultrasonic emitter for substantially matching impedance within the ear canal to impedance of the ultrasonic emitter, the ultrasonic emitter further receiving ultrasound reflected from an ear drum of the user as a result of the launching of the audio modulated ultrasonic carrier signal into the ear canal, the reflected ultrasound being convertible into reusable electrical energy for use by the ultrasonic transducer system.