Signal reception system

Abstract

The reception system of the present invention includes a detection circuit serving as detecting means for detecting that the strength of the receiver signal is equal to or greater than a predetermined value, and a resetting circuit serving as resetting means for, under instruction of the detection circuit, immediately increasing power consumption of the reception section when the detection circuit detects a large signal so as to bring back the state where the reception system ensures the greatest power consumption amount for the entire system and the sufficiently-desirable system performance. Consequently, this invention provides an effect of reducing power consumption amount of the entire system, and an effect of stable reception by preventing reception failure even when a large interfering signal is suddenly supplied due to a change in peripheral radio wave condition.

Description

technical field [0001] The present invention relates to a signal receiving system for a tuner device for receiving electric waves such as a television tuner, and more particularly to a signal receiving system for reducing power consumption during signal reception. Background technique [0002] As a prior art, for example, Patent Document 1 (Japanese Patent Application Laid-Open Publication No. 2002-252811, publication date: September 6, 2002) discloses a method for reducing power consumption in a TV tuner or the like. A signal receiving system used in tuner equipment for radio signal reception. [0003] Hereinafter, a configuration for reducing power consumption of a conventional signal receiving system will be described with reference to FIG. 4 . [0004] The prior art signal receiving system has: an amplifier 401, a mixer 402, a low-pass filter 403, and a variable gain amplifier 404 as a signal receiving processing section; a monitoring circuit 405 as a monitoring device;...

AI Technical Summary

Problems solved by technology

[0017] As mentioned above, it takes a certain amount of time for the monitoring circuit to correctly measure the sharply changing BER and the C / N of the received signal. During this period, the signal receiving performance of the system will naturally decrease. A time delay occurs until the control circuit 406 increases the power consumption of the entire system

[0018] In addition, since the above-mentioned structure controls the power consumption of the system sequentially according to predetermined increments (the method of controlling power consumption through the monitoring circuit and the control circuit will be described later), so when a strong interference signal is suddenly input , since the signal receiving system recovers gradually, it will take a certain amount of time to fully recover

[0019] Due to the above reasons, the system cannot maintain the signal reception performance matching the reception of the desired RF signal during the period from when a strong interference signal is input to when the control circuit 406 increases the power consumption of the entire system. Can't receive signal

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