Power supply circuit for a two-mode vehicular radio receiver
US5394562A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1993 |
| Grant date | Feb 28, 1995 |
| Priority date | — |
| Expiry date | Aug 11, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/1607
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A vehicular radio receiver having a decoder and memory for traffic announcements digitally modulated on a carrier wave that is otherwise modulated by audio signals has separate power input terminals for the portions (A) necessary for recognizing and storing traffic announcements and for (B) all other functions of the vehicular radio receiver. An energy saving circuit connected to these power input terminals of the vehicular radio receiver is energizable by a first power input terminal connected to the vehicular battery through an ignition lock switch of the vehicle, and also by a second power input terminal for supplying, at low current through a low-pass filter, for supplying electricity only to the circuits necessary for recognizing and storing traffic announcements. The energy saving circuit has a first electrically controlled switch for supplying the traffic announcement circuits of the receiver when an ON/OFF switch of the vehicular radio is in its OFF position and when no operating voltage is present at the first power input terminal. A second electrically controlled switch is provided for responding to the turning on of the ignition lock switch and the consequent opening of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.