To provide a technique capable of attaining reduction of a post-stage signal processing load by appropriately adjusting reception sensitivity when receiving a second uplink signal.SOLUTION: In a light emitter/receiver comprising a transmitter for transmitting a downlink signal and a receiver 43 for receiving an uplink signal which is transmitted from a vehicle in response to the downlink signal, a first detection section 474 of the receiver 43 detects that the first uplink signal is started being received. A second amplification section 491 for amplifying a second uplink signal in the receiver 43 amplifies a received signal of a light-receiving section 45 at a low amplification factor in a case where the detection of the first detection section 474 is not performed, and amplifies the received signal of the light-receiving section 45 temporarily at a high amplification factor in response to the detection of the first detection section 474.SELECTED DRAWING: Figure 6
【課題】第2アップリンク信号を受信する際の受信感度を適切に調整し、後段の信号処理負荷の軽減を図ることができる技術を提供すること。【解決手段】ダウンリンク信号を送信するための送信部と、ダウンリンク信号に応答して車両から送信されたアップリンク信号を受信するための受信部43とを備えた投受光器において、受信部43の第1検知部474は、第1アップリンク信号が受信され始めたことを検知する。そして、受信部43において第2アップリンク信号を増幅するための第2増幅部491は、第1検知部474の検知がなされない場合には受光部45の受信信号を低増幅率で増幅するとともに、第1検知部474の検知に応じて、受光部45の受信信号を一時的に高増幅率で増幅する。【選択図】図6
LIGHT EMITTER/RECEIVER
投受光器
2020-10-15
Patent
Elektronische Ressource
Japanisch
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