Method and apparatus for reducing audio interference from cellular telephone transmissions
US6009311A · kind A · utility
69Cited by
17References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1996 |
| Grant date | Dec 28, 1999 |
| Priority date | — |
| Expiry date | Feb 21, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Apparatus and method for reducing the interference of digital cellular telephones with hearing aids. A digital cellular phone is provided with a second antenna that transmits a local, low-power signal which fills in the gaps in the transmitted switched information carrier. This prevents the hearing aid from demodulating the low frequency switched carrier components of the digital cellular phone. Alternatively, the main antenna can transmit on a garbage frequency between time slots, or the hearing aid can detect and cancel the interfering signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.