Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1995-06-07
1996-11-12
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
H04B 118
Patent
active
055750010
ABSTRACT:
A dual-input DBS (direct broadcasting satellite) tuner having a negative feedback & image compression circuit. Radio frequency input signal (950 MHZ-2050 MHZ) is amplified and converted into an intermediate frequency signal through low-pass filters, a radio frequency converter, a tracking filter, an attenuation circuit, and a microwave monolithic integrated circuit, and then demodulated by a second stage amplifier, a SAW filter and a negative feedback & image compression circuit, so as to eliminate noises, increase sound
oise ratio, and improve the threshold when the compressed image intermediate frequency signal enters the demodulator circuit, enabling the tuner to automatically match with the specification of the outdoor antenna subject to the change of weather.
REFERENCES:
patent: 3626301 (1971-12-01), Develet
patent: 3936753 (1976-02-01), Clark
patent: 3942120 (1976-03-01), Ham
patent: 4115737 (1978-09-01), Honger et al.
patent: 4263676 (1981-04-01), Liebel
patent: 4556988 (1985-12-01), Yoshisato
patent: 5404587 (1995-04-01), Okanobu
Eisenzopf Reinhard J.
Hwa Lin Electronic Co., Ltd.
Nguyen Lee
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