Receiving apparatus having a plurality of antennas
US4255816A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1978 |
| Grant date | Mar 10, 1981 |
| Priority date | — |
| Expiry date | Sep 15, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/0814
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An apparatus is disclosed for receiving and processing transmitted electromagnetic waves, for example transmitted radio signals which contain audio information including recognizable speech information. In accordance with the invention, there are provided first and second spaced antennas. Switching means are provided for coupling either the first or the second antenna to a common channel. Signal processing means are provided for processing the signals on the common channel. Means are provided for comparing the signal on the common channel with a predetermined threshold condition and for generating a control signal in response to the comparison. Finally, means are provided for applying the control signal to the switching means to control selection of the first or second antenna. In one preferred embodiment of the invention, the comparator means comprises means for comparing the energy level of the signal at the common channel with a predetermined energy threshold. During operation, the antenna which is active at a particular time will remain active (i.e. coupled to the common channel) so long as the received radio frequency energy, at the characteristic transmission frequency, remai…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.