Patent ID: 7486940

Claim:
A digital broadcasting receiving apparatus, having a receiving circuit for receiving a transmitted high frequency selected program signal of a plurality of time division multiplexed programs, comprising: an electric field strength detector for detecting the strength of an electric field; an error ratio measuring circuit for measuring errors in received data packets; a radio frequency variable gain circuit having a radio frequency operation starting point, the radio frequency operation starting point determining a radio frequency power level of the radio frequency variable gain circuit; a baseband variable gain circuit having a baseband operation starting point, the baseband operation starting point determining a baseband power level of the baseband variable gain circuit; an operation starting point controlling circuit that varies: a) the radio frequency operation starting point to start operation from a low radio frequency power level which is lower than a high radio frequency power level used when detecting the electric field strength and measuring the errors, and b) the baseband operation starting point to start operation from a high baseband power level which is higher than a low baseband power level used when detecting the electric field strength and measuring the errors, wherein while receiving the plurality of time division multiplexed programs other than the selected program, the radio frequency operation starting point and the baseband operation starting point are varied in accordance with a) and b) in response to the detected electrical field strength being above a predetermined electric field threshold and the measured errors in the received data packets being above a predetermined error threshold.