Microcomputer processing approach for a non-volatile TV station memory tuning system
AssigneeTexas Instruments Incorporated
InventorKenneth George Buss
Life of this patent
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Abstract
A television tuning system having a non-volatile memory for storing digital tune words is electrically updated by a microcomputer type architecture control circuitry. A ROM memory matrix is provided for the storage of VHF minimum and maximum binary tune words corresponding to each of twelve VHF channels in addition to a UHF minimum and maximum binary tune word encompassing all possible 72 UHF channels. Tuning of individual VHf and UHF channels is accomplished by incrementing or decrementing a given tune word within the minimum and maximum limits established in the ROM memory matrix by means of a microcomputer processing approach.
Claims17
A method for tuning a broadcast receiver to a selected frequency using a microcomputer comprising the steps of:
- generating a binary address for outputting a digital tune word corresponding to said selected frequency from a memory matrix containing a plurality of said digital tune words;
- storing said outputted digital tune word and said binary address in a shift register;
- updating said digital tune word stored in said shift register by incrementing or decrementing said digital tune word by an increment value read from a data memory matrix;
- and
- converting said digital tune word stored in said shift register into an analog voltage operative to tune said broadcast receiver to said selected frequency.
A method for tuning a broadcast receiver to a selected frequency using a microcomputer comprising the steps of:
- generating a binary address on a multibus line;
- addressing a digital tune word corresponding to said selected frequency from a memory matrix by means of said binary address;
- storing said binary address and said addressed digital tune word in a shift register;
- updating said stored digital tune word by incrementing or decrementing said stored digital tune word by means of an increment value read from a binary data memory matrix;
- generating a plurality of operating instructions and logic functions operative in updating said digital tune word;
- producing a plurality of input control functions operable to change the sequence of said operating instructions and
- converting said digital tune word stored in said shift register into an analog voltage operative to tune said broadcast receiver to said selected frequency.
Dependencies are inferred from the claim text.