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CAR RADIO RECEIVER LISTENING STATE INVESTIGATION METHOD AND ITS SYSTEM, AND CAR RADIO RECEIVER LISTENING STATE MEASUREMENT DEVICE THEREOF
CAR RADIO RECEIVER LISTENING STATE INVESTIGATION METHOD AND ITS SYSTEM, AND CAR RADIO RECEIVER LISTENING STATE MEASUREMENT DEVICE THEREOF
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机译:车载无线电接收监听状态调查方法及其系统,以及其的车载无线电接收状态测量装置
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摘要
PROBLEM TO BE SOLVED: To provide a car radio receiver listening state investigation system by which a listening state of a car radio receiver is accurately investigated. ;SOLUTION: Each vehicle 1 records measurement data, including characteristics quantity and a measurement period of a reproduced audio signal of a car radio receiver over a prescribed time, at a prescribed measurement start time that comes once around without fail e.g. for one minute and later sends the data to an investigation center 4 altogether. A broadcast reception station 3 generates master data by station, including a characteristics quantity and a measurement period of a reproduced audio signal of a tuner 32 for receiving an object radio station over a prescribed time for each prescribed measurement start time the same as each vehicle and sends the data to the investigation center 4. A station-dependent master DB 43 of the investigation center 4, and a characteristics quantity of each measurement period in the measured data sent from each vehicle 1 is compared with characteristics quantity of the master data at the same measurement period of each station to discriminate a listening station a each measurement period of each vehicle 1. A clock for each vehicle 1 and the broadcast reception transmission 3 is in synchronism with a reference time of a GPS satellite.;COPYRIGHT: (C)1999,JPO
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