Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1991-07-24
1995-06-27
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551661, 4551861, H04B 116
Patent
active
054288274
ABSTRACT:
A radio data system (RDS) receiver has a station selector circuit including a microprocessor, several Alternative Frequency (AF) memory cells, and at least one learning memory cell associated with each AF memory cell. In a preferred embodiment, a counter is associated with each learning memory cell. The AF memory cells store alternative frequencies decoded from a Radio Data System signal. As each station is tuned successfully, i.e. with adequate signal strength, its frequency is stored in one of the learning memory cells. When signal deterioration requires a skip to a new frequency, the "skip frequencies" stored in the learning memory cells are preferred to other frequencies. The counters keep track of how many times, since power-up, each frequency has been successfully tuned, and the frequency with the highest count is the "most preferred" alternative frequency.
REFERENCES:
patent: 4392247 (1983-07-01), Van Deursen
patent: 4450589 (1984-05-01), Ekers et al.
patent: 4862513 (1989-08-01), Bragas
patent: 5170487 (1992-12-01), Peek
Specifications of the Radio Data System (RDS) for VHF/FM Sound Broadcasting (EBU Technical Centre, Brussels, Mar. '84), pp. 1, 14-17 and 29-31.
Blaupunkt-Werke GmbH
Urban Edward F.
LandOfFree
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