BTE assistive listening receiver with interchangeable crystals
US5802183A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1995 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Dec 6, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2225/51
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A behind-the-ear assistive listening receiver having a housing containing an RF receiver. The housing includes a cavity in which two or more crystal carriers are removably insertable. Each of the crystal carriers contains an oscillation crystal tuned to a particular frequency corresponding to an RF frequency desired to be received by the user. A switch is provided for permitting the user to select one of the oscillation crystals to automatically tune for the RF receiver to the desired RF frequency. Each crystal carrier may contain visible indicia indicating the frequency to which it is tuned, and the carriers may be positioned in the housing so that the indicia are generally visible to others when the receiver is worn by the user. The assistive listening receiver may also include a conventional hearing aid microphone for converting ambient sounds into an electrical hearing aid signal. A mixer is provided within the housing for mixing the hearing aid signal with the RF signal to provide a mixed output signal. The mixer attenuates the maximum hearing aid signal with respect to the maximum RF signal by about 1 to 10 decibels so that the maximum RF signal will be perceptibly louder to …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.