Patent ID: 7359691
Filing Date: 2008-04-15
Classification: H04B

Abstract:
1. A high frequency apparatus comprising: an input terminal for receiving a high frequency signal; a mixer having an input port for receiving the signal fed through the input terminal, and another input port in connection to an output of a local oscillator; an output terminal for delivering an output of the mixer; an interference-cut filter disposed between the input terminal and the mixer for removing an interfering signal included in the high frequency signal; a demodulator and an error correction circuit disposed in this order between the mixer and the output terminal; and an AGC voltage detector circuit in connection to an output of the mixer, wherein the interference-cut filter is controlled when an interfering signal is transmitted, wherein the interference-cut filter is controlled when a value of error correction signal output by the error correction circuit exceeds a predetermined value, and wherein the interference-cut filter is controlled when an output of the AGC voltage detector circuit is within a predetermined voltage range.