Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent
1996-03-27
1998-04-14
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
4551861, 455205, 4551661, H04B 100
Patent
active
057405182
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.
REFERENCES:
patent: 4236251 (1980-11-01), Ohgishi et al.
patent: 4630271 (1986-12-01), Yamada
patent: 4819231 (1989-04-01), Yamada
patent: 5432800 (1995-07-01), Kuroda et al.
patent: 5471662 (1995-11-01), Shiota
patent: 5583873 (1996-12-01), Miyake et al.
Kawano Kazuya
Takashima Susumu
Casio Computer Co. Ltd.
Eisenzopf Reinhard J.
To Doris
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