KR980006835A - Digital analog tuner for satellite broadcasting - Google Patents

Abstract

The present invention relates to a digital analog satellite tuner, and to an analog tuner and a digital tuner capable of receiving analog broadcasts using an FM (frequency modulation) modulation method and digital broadcasts using a quadrature phase shift keying (QPSK) modulation method. Place the tuner in one chassis.

Description

Digital analog tuner for satellite broadcasting

As this is a public information case, the full text was not included.

2 is a block diagram showing the configuration of a digital analog and satellite tuner according to the present invention.

Claims (2)

An apparatus for receiving analog and digital satellite broadcast signals, the apparatus comprising: a high frequency amplifier for amplifying a high frequency signal input from a parabolic antenna and a low noise blockdown converter (LNB), and an automatic gain control voltage as a control signal A high frequency auto gain controller for automatically controlling the gain of the high frequency signal output from the amplifier, a second high frequency amplifier for amplifying the signal output from the high frequency auto gain controller 22, and an output from the second high frequency amplifier A variable filter for removing the video signal according to the tuning voltage to remove the influence of the video signal on the signal, a first mixer for mixing a local oscillation signal with the signal output from the variable filter, and the first mixer A local oscillation amplifier for amplifying a local oscillation signal supplied to the first oscillation unit, and a local oscillation signal for supplying a local oscillation signal to the first mixing unit; A local oscillation unit, a tuning voltage that varies according to the frequency of the signal output from the first mixing unit, the PLL unit for outputting a tuning voltage to the variable filter, the first local oscillating unit, and the output of the mixing unit An intermediate frequency automatic gain control unit for amplifying the intermediate frequency signal according to the automatic gain control voltage, a first intermediate frequency amplifier for amplifying the intermediate frequency signal output from the intermediate frequency automatic gain control unit, and the first intermediate frequency amplifier unit An intermediate frequency band filter for passing a signal of a predetermined band among the output signals, a second intermediate frequency amplifier for amplifying the intermediate frequency signal output from the band filter, and an intermediate frequency signal output from the second intermediate frequency amplifier An FM demodulator for demodulating the baseband signal at < RTI ID = 0.0 > and a < / RTI > A third mixing section for mixing a second oscillation section and a local oscillation signal 90 degrees or more to the intermediate frequency signal output from the second intermediate frequency amplifying section, and a local section for the second and third mixing sections. And a second local oscillator for outputting an oscillation signal and first and second base signal amplifiers for amplifying the signals output from the second and third mixers, respectively. 2. The digital analog tuner for satellite broadcasting as claimed in claim 1, wherein each part is mounted in one chassis. ※ Note: The disclosure is based on the initial application.