Acoustic heterodyne device and method
US5889870A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 17, 1996 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Jul 17, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2217/03
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention is the emission of new sonic or subsonic compression waves from a region resonant cavity or similar of interference of at least two ultrasonic wave trains. In one embodiment, two ultrasonic emitters are oriented toward the cavity so as to cause interference between emitted ultrasonic wave trains. When the difference in frequency between the two ultrasonic wave trains is in the sonic or subsonic frequency range, a new sonic or subsonic wave train of that frequency is emitted from within the cavity or region of interference in accordance with the principles of acoustical heterodyning. The preferred embodiment is a system comprised of a single ultrasonic radiating element oriented toward the cavity emitting multiple waves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.