FM character data multiplex broadcasting signal receiving apparatus
US5740518A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1996 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Mar 27, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H2201/15
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An FM broadcasting signal carrying multiplex character data transmitted from a radio broadcasting station is automatically preset in an FM receiving apparatus. An FM broadcasting signal is received, and a frequency information of the received FM broadcasting signal is temporarily memorized in a memory. It is judged whether a PLL lock signal is produced by a clock signal reproducing circuit during a demodulation process of the FM broadcasting signal whose frequency information is memorized in the memory. When it is determined that the PLL lock signal is produced by the clock signal reproducing circuit, it is determined that the FM broadcasting signal carries multiplex character data, and the frequency information of said FM broadcasting signal is preset to the FM receiving apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.