Electronic tuning type television receiver

Details Electronic tuning type television receiver Electronic tuning type television receiver

1979-08-29

1981-05-26

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455186, 455195, H04B 126

Patent

active

042702208

ABSTRACT:
A television receiver of electronic tuning type employing a variable capacitance diode in a local oscillator of its tuning circuit, which comprises a memory storing a plurality of digital data indicative of tuning voltages corresponding to a plurality of channels respectively so that a tuning voltage corresponding to a selected channel can be applied to the variable capacitance diode in the tuning circuit, a D/A converter converting a digital data corresponding to a selected channel into an analog voltage to be supplied to the variable capacitance diode, and a tuning voltage control circuit which functions to sequentially modify, at a predetermined rate, the digital data of the selected channel read out from the memory until the tuning point is reached in the tuning circuit, and which applies sequentially such a signal to the D/A converter, whereby the tuning circuit can be tuned to the selected channel regardless of secular and other variations in the operating characteristic of the variable capacitance diode.

REFERENCES:
patent: 3928808 (1975-12-01), Evans
patent: 3999131 (1976-12-01), Fukuda et al.
patent: 4085371 (1978-04-01), Mogi et al.
patent: 4152654 (1979-05-01), Tanaka
patent: 4220922 (1980-09-01), Ikeguchi

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