Dual element headphone
US4418248A · kind A · utility
142Cited by
8References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1981 |
| Grant date | Nov 29, 1983 |
| Priority date | — |
| Expiry date | Dec 11, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R17/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A stereophone includes cup assemblies which are supported over the ears of a user by a headband. Each cup assembly includes a piezoelectric acoustic transducer and a dynamic acoustic transducer. The reproduction of the entire audio spectrum is divided between the two transducers at a crossover frequency which is established by an acoustic filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.