Receiver including a tuning circuit having a transmitter search
AssigneeU.S. Philips Corporation
InventorTheodorus H. Van Deursen
Life of this patent
Estimating the term…
Abstract
A receiver scanning circuit features a grouping of the stored frequencies, such as by geographical area or program content. Thus only one kind of station from a selected group need by stopped at, if only that kind of group is desired to be received. This greatly increases operator convenience.
Claims5
A tuning circuit for a receiver comprising memory means for storing a plurality of groups of electrical quantities representing tuning frequencies, each of said groups comprising a plurality of electrical quantities representing tuning frequencies;
- search device means coupled to said memory means for scanning said groups;
- a group selection circuit means for selecting a group to be scanned, and means coupled to said search device means and to said group selection circuit means for stopping said scanning upon reception of a receive signal of sufficient amplitude;
- the memory including a group mark section means for storing group identification information and a tuning data section means for storing said electrical quantities representing tuning frequencies, said search device means scanning both said group mark section and said tuning data section, and said stopping means comprising a detector means for providing a reception condition signal upon said received signal having said sufficient amplitude, identification circuit means coupled to the group mark section of the memory and to said group selection circuit means for delivering an identification signal when the group mark section of the memory equals a group mark determined by the group section circuit, and a gate having inputs coupled to said detector and identification circuit means respectively and an output coupled to said search device means.
A tuning circuit for a receiver comprising memory means which include a plurality of simultaneously scannable groups of the electrical quantities representing tuning data frequencies, said memory means further including a separate output for each of said groups;
- search device means coupled to said memory means for scanning said tuning data frequencies in said scannable groups;
- a scanning group selection circuit means coupled to said separate outputs of said memory means for selecting with one switching action at will one of said scannable groups to be scanned without changing the group arrangement of the tuning data frequencies of the memory means;
- and means coupled to said search device means and to said group selection circuit means for stopping said scanning upon reception of a received signal of sufficient amplitude.
Dependencies are inferred from the claim text.