Receiver device
First Claim
1. A receiver device comprising:
- a plurality of antennas having different antenna gains;
an antenna switching device for selecting one of reception signals received by the plurality of antennas, and supplying the selected reception signal to a signal processor arranged subsequent to the antenna switching device;
a detector for detecting the level of a reception signal from each antenna; and
a controller for controlling the antenna switching device for selecting a reception signal having a lower level than a maximum input level of the signal processor, in accordance with detection result from the detector,wherein the controller operates to control the antenna switching device, in a manner such that once the level of a reception signal supplied to the signal processor becomes lower than a predetermined level, an antenna having a higher antenna gain than that of an antenna being selected is selected,wherein the controller has a judger for judging a reception state of each antenna; and
when there are a plurality of antennas capable of receiving signals without any troubles, the antenna switching device is controlled so as to select a reception signal from an antenna having a low antenna gain.
1 Assignment
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Accused Products
Abstract
A receiver device for receiving incoming radio waves by using a plurality of antennas, which is capable of improving the maximum input sensitivity is provided. In the receiver device, a switching unit switches to an antenna having the lower antenna gain as a new receiving antenna on the precondition that when receiving incoming radio waves by one particular antenna currently set as the receiving antenna, if a reception level of this particular antenna becomes a level close to the maximum input sensitivity of a signal processing unit, then the reception condition is satisfactory. Consequently, it is possible to improve the maximum input sensitivity and forestall the occurrence of waveform distortion and the like.
31 Citations
4 Claims
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1. A receiver device comprising:
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a plurality of antennas having different antenna gains; an antenna switching device for selecting one of reception signals received by the plurality of antennas, and supplying the selected reception signal to a signal processor arranged subsequent to the antenna switching device; a detector for detecting the level of a reception signal from each antenna; and a controller for controlling the antenna switching device for selecting a reception signal having a lower level than a maximum input level of the signal processor, in accordance with detection result from the detector, wherein the controller operates to control the antenna switching device, in a manner such that once the level of a reception signal supplied to the signal processor becomes lower than a predetermined level, an antenna having a higher antenna gain than that of an antenna being selected is selected, wherein the controller has a judger for judging a reception state of each antenna; and when there are a plurality of antennas capable of receiving signals without any troubles, the antenna switching device is controlled so as to select a reception signal from an antenna having a low antenna gain. - View Dependent Claims (2, 3)
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4. A method for selecting a receiving antenna in a receiving device, comprising:
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detecting the level of a reception signal from each antenna in a plurality of antennas; based on the detection result from the detector, selecting one antenna from the plurality of antennas, the reception signal from the selected antenna having a lower level than a maximum input level of a signal processor; supplying the reception signal from the selected antenna to the signal processor; controlling the antenna switching device, in a manner such that once the level of a reception signal supplied to the signal processor becomes lower than a predetermined level, an antenna having a higher antenna gain than that of an antenna being selected is selected, wherein the controller has a judge for judging a reception state of each antenna; and controlling the antenna switch device in a manner such that when there are a plurality of antennas capable of receiving signals without any troubles, a reception signal from an antenna having a low antenna gain is selected.
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Specification