Auto tuning apparatus

Details Auto tuning apparatus Auto tuning apparatus

1988-09-21

1990-04-24

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455165, 455254, 455260, H04B 1116, H04B 126

Patent

active

049196405

ABSTRACT:
An auto tuning apparatus sequentially varies the value of N, a positive integer, in the frequency-dividing ratio 1/N of a variable frequency-dividing circuit incorporated in a local oscillating circuit having a phase locked loop configuration. The apparatus detects a plurality of candidate tuning points of an intermediate frequency carrier and includes a circuit for performing a scan of those tuning points by, among other steps, changing a tuning point detecting threshold relative to the level of the received signal. A circuit is provided for determining the correct or optimum tuning point on the basis of the scan.

REFERENCES:
patent: 4355414 (1982-10-01), Inoue
patent: 4392253 (1983-07-01), Yamada et al.
patent: 4461035 (1984-07-01), Sakamoto
patent: 4727591 (1988-02-01), Manlove

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