All electronic digital tuner system with memory
AssigneeZenith Radio Corporation
InventorsJohn Ma, Akio Tanaka
Life of this patent
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Abstract
An all-electronic television tuning system has a sequentially accessible multi-position two digit memory coupled to a viewer controlled channel number selection means for providing storage and recall of selected two digit channel numbers in a sequence established by loading selected channel numbers into fifteen of sixteen serial memory locations. The system has program and operate modes, corresponding respectively to storage and recall of channel number information, and the memory has a sixteenth, particular location accessible only in the operate mode for providing immediate all channel tuning control for the viewer irrespective of the pre-programmed channel number sequence.
Claims10
An all-electronic television tuning system comprising:
- voltage controllable oscillator means for selectively tuning a plurality of fixed frequency bandwidth television channels in a predetermined range of frequencies;
- encoding means converting the tuning frequency of said oscillator means into channel number information;
- channel number selection means;
- comparison means comparing channel number information from said encoding means and said selection means;
- voltage generating means for changing the tuning frequency of said voltage controllable oscillator means under the control of said comparison means;
- memory means coupled between said selection means and said comparison means including a plurality of memory locations;
- said television tuning system having a program mode permitting the storage of channel number information from said selection means in said memory means, an operate mode permitting recall of channel number information from said memory means for supplying input information to said comparison means and means coupled to said memory means for establishing either of said modes;
- and
- said memory means having a particular location accessible only in said operate mode for channel number information storage to cause immediate tuning to the corresponding channel.
Dependencies are inferred from the claim text.