US 7,177,615 B2 · Receiver with adjacent interfering wave elimination function

Abstract

A receiver with adjacent interfering wave elimination function that efficiently eliminates an interfering wave adjacent to a desired reception wave and has few distortion in the receiving signal after detection, is provided with a plurality of bandpass filters for detecting an adjacent interfering wave near a desired reception wave, detects adjacent interfering waves near the desired reception wave, and controls the bandwidths of the bandpass filters that pass the desired reception wave according to the occurrence of the adjacent interfering wave. According to another aspect of the present invention, the bandpass filter for detecting the adjacent interfering wave is made of a digital filter whose center frequency is variable, and the adjacent interfering wave is detected by scanning a frequency region adjacent to the desired reception wave with the digital filter.

Claims23

Dependent claims

A receiver with adjacent interfering wave elimination function for detecting and eliminating an adjacent interfering wave that is adjacent to a receiving signal frequency, comprising:

a high-frequency processing device that selects a desired high-frequency signal from received high-frequency signals and amplifies it;
an intermediate-frequency processing device that converts a frequency of the selected high-frequency signal to generate an intermediate-frequency signal, and outputs components within a predetermined passband of the intermediate-frequency signal;
an adjacent interfering wave detector that detects an interfering wave contained in a region adjacent to a frequency band of the selected high-frequency signal and generates an adjacent interfering wave detection signal indicating a frequency range in which the interfering wave exists;
and
a control device for adjusting the passband so as to eliminate the frequency range in which the adjacent interfering wave exists from the passband based on the adjacent interfering wave detection signal.

2 more elements

Dependencies are inferred from the claim text.

Receiver with adjacent interfering wave elimination function

Life of this patent

Receiver with adjacent interfering wave elimination function

Life of this patent

Abstract

Claims23