Headphoning
US4455675A · kind A · utility
223Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1982 |
| Grant date | Jun 19, 1984 |
| Priority date | — |
| Expiry date | Apr 28, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/1066
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Headphones have a small cavity between the diaphragm and the ear canal with a microphone in the cavity closely adjacent to the diaphragm providing a feedback signal that is combined with the input electrical signal to be reproduced by the headphones to provide a combined signal that is power amplified for driving the diaphragm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.