Abstract: A high-frequency signal receiver includes a mixer having one port for receiving an input signal and another port for receiving an output from a local oscillator, a filter for receiving an output from the mixer, and an output terminal to which an output from the filter is supplied. At least the mixer and the filter are formed of balanced circuits, so that they have high capability of eliminating interference. Distances between the circuits thus can be short. Further, partition plates for shielding the interference are not needed, thus allowing the receiver to be small.

Abstract: A high-frequency signal receiver includes a variable gain amplifier for amplifying a high frequency signal input thereto, a local oscillator, a mixer for mixing a signal output from the variable gain amplifier and a signal output from the local oscillator, a filter for receiving a signal output from the mixer, a gain controller for outputting a voltage according to the signal output from the mixer; and a weighting circuit for weighting and summing a control voltage and the signal output from the gain controller for controlling the gain of the variable gain amplifier. The high-frequency signal receiver hence creates a small amount of signal error even when the input signal includes a large interference signal adjacent to a desired signal.

Abstract: A high-frequency signal receiver includes a mixer having one port for receiving an input signal and another port for receiving an output from a local oscillator, a filter for receiving an output from the mixer, and an output terminal to which an output from the filter is supplied. At least the mixer and the filter are formed of balanced circuits, so that they have high capability of eliminating interference. Distances between the circuits thus can be short. Further, partition plates for shielding the interference are not needed, thus allowing the receiver to be small.

Abstract: A high-frequency signal receiver includes a variable gain amplifier for amplifying a high frequency signal input thereto, a local oscillator, a mixer for mixing a signal output from the variable gain amplifier and a signal output from the local oscillator, a filter for receiving a signal output from the mixer, a gain controller for outputting a voltage according to the signal output from the mixer; and a weighting circuit for weighting and summing a control voltage and the signal output from the gain controller for controlling the gain of the variable gain amplifier. The high-frequency signal receiver hence creates a small amount of signal error even when the input signal includes a large interference signal adjacent to a desired signal.

Abstract: A set top terminal of the present invention includes: a tuner unit for receiving a signal from an external input terminal and selecting a signal of a predetermined frequency; a signal processing unit for decoding the selected signal; a modulation unit for outputting a signal obtained by decoding the selected signal from an external output terminal; a control unit for controlling the tuner unit, the signal processing unit and the modulation unit; a power source unit for supplying power to the tuner unit, the signal processing unit, the modulation unit and the control unit, respectively; and a main board on which the tuner unit, the signal processing unit, the modulation unit and the control unit are placed, wherein the tuner unit, the signal processing unit, the modulation unit, the control unit and the power source unit are separate individual bodies.