United States Patent
US Patent 4277785: Radio control circuit with microprocessor
US 4277785 ยท granted 1981-07-07
| Patent Number | 4277785 |
|---|---|
| Title | Radio control circuit with microprocessor |
| Filed | 1978-06-16 |
| Granted | 1981-07-07 |
| Inventor(s) | Larry A. Schotz, Thomas W. Wiesmann |
| Assignee | DRACO LABS Inc |
| CPC Classification | H03J5/0281, H03J5/00, H03J5/0272 |
| Number of Claims | 3 |
Abstract
An FM tuner control circuit contains a digital frequency synthesizing control circuit, digital computer means including a microprocessor, a memory circuit, and a manual control circuit for digitally tuning the tuner to any desired FM station. The memory circuit includes a read-only memory containing programs for the microprocessor and a random-access memory in which a group of predetermined station frequencies can be stored. The control circuit also includes a call letter display circuit, a frequency scale pointer display circuit, a frequency display circuit, a manual tuning circuit, and remote control switches for the manual control circuit.
Claims Summary
1. Means for use with a radio receiver for enabling display of characters representative of the call letters of a radio transmitting station to which said radio receiver is tuned, said means comprising:memory means for storing a table of digital data corresponding with call letters of a plurality of radio transmitting stations and their frequencies,