Parametric in-ear impedance matching device
US9794694B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 2015 |
| Grant date | Oct 17, 2017 |
| Priority date | — |
| Expiry date | Apr 23, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2217/03
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
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 may be implemented with an impedance matching element or optimized for matching the response within a user's ear canal, and the ultrasonic audio transducer system may include The ultrasonic audio headphone system can further include a frequency mismatched microphone to avoid feedback when the microphone and the ultrasonic speaker are, e.g., proximately located.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.