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US 4,285,066 AGranted
Receiver having a search tuning circuit
AssigneeU.S. Philips Corporation
InventorTheodorus H. M. Van Deursen
Life of this patent
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Abstract
In a receiver having a search tuning circuit by means of which a group of tuning data, corresponding to predetermined transmitters, can be searched, a frequency detector is used in addition to a field strength detector to enable a rapid restarting of a search action if the search stopped at a transmitter having a frequency which deviates somewhat from the desired frequency.
Claims5
A tuning circuit for a receiver comprising:
- memory means which includes a plurality of scannable groups of tuning data, each tuning datum representing a frequency of a desired radio transmitter, said memory means further including a separate output for each of said groups;
- search means coupled to said memory means for incrementally selecting a tuning datum of said tuning data in each of said scannable groups;
- a scannable group selection means coupled to said separate outputs for selecting one of said scannable groups, said receiver then being tuned to said selected tuning datum in said selected scannable group;
- means coupled to said search means for stopping the incremental scanning upon the reception of a received signal having sufficient field strength;
- and
- means for automatically restarting said seach means if the frequency of the received signal does not correspond to said tuning datum selected by said search means from the tuning data in said selected scannable group.
3 more elements
Dependencies are inferred from the claim text.