Apparatus for controlling tuning point and tuning circuit having

Details Apparatus for controlling tuning point and tuning circuit having Apparatus for controlling tuning point and tuning circuit having

1997-05-30

1999-11-16

Chin, Wellington

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551811, 4551841, 455183, 364157, H04B 118

Patent

active

059873132

ABSTRACT:
Disclosed is an apparatus for controlling a tuning point and a tuning circuit having a function of controlling a tuning point, which can selectively tuning each broadcasting signal by using a varactor diode. During a work for tuning points, a tuning voltage is applied to the tuning circuit, and a tuning point voltage with respect to the tuning voltage is stored in a memory section. If the tuning voltage is applied to the tuning circuit, a control section reads tuning point voltage data stored in the memory section, controls a voltage generating apparatus based on the read tuning point voltage data and provides the tuning point voltages for a relevant selected channel to the tuning circuit. Therefore, the work for tuning points in the manufacturing of a tuner can be omitted and the productivity and the function of the tuner are improved.

REFERENCES:
patent: 3867568 (1975-02-01), Merriweather
patent: 5023938 (1991-06-01), Takegawa et al.
patent: 5430891 (1995-07-01), Kianush et al.
patent: 5438377 (1995-08-01), Chang
patent: 5450621 (1995-09-01), Kianush et al.
patent: 5564088 (1996-10-01), Saitoh
patent: 5581529 (1996-12-01), Roth et al.
patent: 5784691 (1998-07-01), Ruhl

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