Telephone handset transmitter with improved output response
US4086445A · kind A · utility
3Cited by
2References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1977 |
| Grant date | Apr 25, 1978 |
| Priority date | — |
| Expiry date | Jan 21, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/03
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A conventional telephone handset transmitter is given a modified (improved) output response by providing an acoustic resistance path to and from the confined air chamber formed between the frame and the diaphragm of the transmitter, the acoustic resistance being less than conventional, for example less than 40 ohms a maximum and approaching zero as a minimum. More than one aperture can be provided, and a tube may surround an aperture to provide some inertance to air flow.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.