Tuning system equalized with the slope factor of the tuning curv

Details Tuning system equalized with the slope factor of the tuning curv Tuning system equalized with the slope factor of the tuning curv

Filed on

1977-04-28

Date issued

1979-02-27

Examiner

Griffin, Robert L.

Patent Class

Facsimile and static presentation processing

SubClass

Facsimile

SubSubClass

Specific signal processing circuitry

Other Related Categories

358191, H04B 126

Type

Patent

Status

active

Patent number

041421574

Description

ABSTRACT:
A tuning system for a television receiver includes a channel number generator coupled to nominal tuning memories, fine tune memories and slope factor memories. The memory outputs are coupled to a corresponding plurality of comparators which are also coupled to counters for deriving pulse-width modulated (PWM) signals corresponding to tuning information stored in the memories. The PWM signals are supplied to a tuning voltage generator where they are combined to produce the tuning voltage for the tuner. The information in the slope factor memories is based upon the slope of the tuning curve corresponding to the selected channel number. The final tuning voltage consists of the nominal tuning voltage combined with the product of the fine tune voltage and slope factor.

REFERENCES:
patent: 3715687 (1973-02-01), Solender
patent: 3914696 (1975-10-01), Evans
patent: 4017800 (1977-04-01), Champagne

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