JPH11275032A - Car radio receiver listening state investigation method and its system, and car radio receiver listening state measurement device thereof - Google Patents

Abstract

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.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for investigating a listening condition of a car radio mounted on a vehicle such as a private passenger car, a commercial passenger car, and a lorry.

[0002]

2. Description of the Related Art Radio coverage surveys have been generally conducted for radios installed in homes. However, with the rapid development of motorization in recent years, the chances of listening to radios while driving a car have increased. , With it,
The importance of investigating the status of listening to car radios has increased.

[0003] An example of the prior art for investigating the listening situation of a car radio is described in Japanese Patent Application Laid-Open No. Hei 7-327017. In this prior art, the sound flowing from a speaker of a car radio is compared with the sound independently reproduced by a reference radio previously mounted on each vehicle while changing the tuning of the reference radio sequentially. A radio listening station is specified on each vehicle side, and measurement data is transmitted to the center by wireless communication, enabling investigation.

[0004]

In the above-mentioned prior art, the listening station is determined on each vehicle side by comparing the output of the reference radio mounted on each vehicle with the output of the car radio. For this reason, a radio having the same or better performance as a car radio was required as a reference radio. However, unlike car radios, which have been carefully equipped with measures against fading, including the mounting position of the antenna, in the case of a reference radio that will be installed later for investigation, there is a particular restriction on the mounting location of the antenna, and sufficient reception sensitivity Is often not obtained. If the reception sensitivity of the reference radio is low, the listening station cannot be determined at all, or a determination error occurs.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art by performing the determination of the listening station on the vehicle side rather than on the vehicle side, but collectively on the investigation center side.

[0006]

According to the present invention, there is provided a car radio listening situation survey method for examining a car radio listening situation mounted on a vehicle. During the period when the power of the car radio is turned on, each time a predetermined measurement start time arrives, the characteristic amount of the audio signal being reproduced on the car radio for a predetermined time from that time and the current measurement time are specified. Create and record measurement data including data, transmit the recorded series of measurement data collectively to the fixed facility side, and at the fixed facility side, every time the predetermined measurement start time arrives A master for each station including the characteristic amount of the audio signal being reproduced by the receiving tuner of each radio station and the data specifying the current measurement time from the time for the predetermined time. Data of each vehicle in the measurement data transmitted from each vehicle, and comparing the characteristic amount of each measurement time with the characteristic amount of the same measurement time in the created master data of each station. It is characterized in that a listening station at each measurement time is determined.

The predetermined measurement start time is set at least once every several minutes (for example, one every one minute), and the data specifying the measurement time is associated with each measurement start time on a one-to-one basis. It is characterized in that it is a serial number assigned.

In the car radio listening situation survey method of the present invention configured as described above, for example, at each predetermined measurement start time that always appears once a minute, a If the power of the radio is turned on, the characteristic amount (for example, the average amplitude for each pass band of the audio signal) of the audio signal such as voice and music played on the car radio for a certain period of time, for example, 10 seconds from the current measurement start time. A logarithmically converted power vector and data specifying the current measurement time (for example, one-to-one at the measurement start time)
), And transmits the series of measurement data to a fixed facility such as a survey center by a mobile phone or the like at a predetermined time for each vehicle, for example. On the fixed equipment side as well, every time the same predetermined measurement start time arrives, the characteristic amount of the audio signal being reproduced by the receiving tuner of each radio station and the current measurement time are specified for the fixed time from that time. Station-specific master data including the data to be transmitted. And
The feature quantity of each measurement time in the measurement data transmitted from each vehicle is compared with the feature quantity of the same measurement time in the master data of each station created above, and the listening station at each measurement time of each vehicle is determined. .

A car radio listening situation survey system of the present invention is a car radio listening situation survey system for examining a listening situation of a car radio mounted on a vehicle, wherein the plurality of vehicles to be investigated, a broadcast receiving station, The vehicle comprises a survey center, wherein each of the vehicles is configured to measure a current time, and each time the vehicle clock measures a predetermined time during a period in which a car radio is turned on. Measurement data creation and recording means for creating and recording measurement data including a feature amount of an audio signal being reproduced on a car radio for a fixed time from time and data specifying a current measurement time; and Wireless means for transmitting to a research center, wherein the broadcast receiving station comprises:
A receiving station timing means for timing the current time, a receiving tuner for each radio station, and a receiving tuner for each radio station from the time to the predetermined time each time the receiving station timing means clocks the predetermined time. Master data creating means for creating master data for each station including the characteristic amount of the audio signal being reproduced by the tuner and the data specifying the current measurement time, and communication for transmitting the created master data to the survey center Means, and the survey center comprises: a master data holding means for each station for holding master data received from the broadcast receiving station; and a feature amount at each measurement time in measurement data transmitted from each vehicle. A listening station that determines a listening station of each vehicle at each measurement time by comparing the feature amount of each station held at another measurement data holding unit with the feature amount at the same measurement time. Characterized in that it comprises a constant means.

Each of the vehicles includes a vehicle GPS receiver, and means for adjusting the time of the vehicle timekeeping means of the vehicle based on a reference time acquired from a GPS satellite by the vehicle GPS receiver. The place is the receiving station G
It is characterized by comprising a PS receiver and means for adjusting the time of the clock means for the receiving station based on the reference time acquired from the GPS satellite by the GPS receiver for the receiving station. Further, the predetermined measurement start time is at least one in several minutes.
One (for example, one per minute) is set, and the data specifying the measurement time is a serial number associated with each measurement start time on a one-to-one basis.

[0011] In the car radio listening situation survey system of the present invention configured as described above, in each vehicle, G
A vehicle clock such as a real-time clock whose time is appropriately adjusted according to the reference time from the PS satellite accurately measures the current time, and the measurement data creation and recording means always appears, for example, once a minute. If the power of the car radio is turned on at each predetermined measurement start time, the characteristic amount of the audio signal such as voice and music played on the car radio for a certain period of time such as 10 seconds from the current measurement start time Record measurement data including (for example, a vector of power obtained by logarithmically converting the average amplitude of each pass band) and data (for example, a serial number corresponding to a one-to-one correspondence at the measurement start time) specifying the current measurement time, The wireless means transmits the recorded series of measurement data to the survey center at a predetermined time, for example, for each vehicle. On the other hand,
At the broadcast receiving station, the time measuring means for the broadcast receiving station, such as a real-time clock, whose time is appropriately adjusted according to the reference time from the GPS satellites, accurately measures the current time. For each predetermined measurement start time exactly the same as that described above, the station-specific data including the characteristic amount of the audio signal being reproduced by the reception tuner of each radio station and the data for specifying the current measurement time for a fixed time from that time. The master data is created, and the communication means transmits the created master data to the survey center. Then, in the survey center, the station-specific master data holding means holds the master data received from the broadcast receiving station, and the listening station determining means determines the characteristic amount at each measurement time in the measurement data transmitted from each vehicle by the station. The listening station at each measurement time of each vehicle is determined by comparing the feature amount of each station at the same measurement time held in the master data holding means.

Further, the car radio listening condition measuring device of the present invention is a car radio listening condition measuring device mounted on a vehicle for investigating a listening condition of the car radio mounted on the vehicle. A clock, a car radio ON / OFF detector for detecting whether or not the power of the car radio is turned on, and each time the real-time clock measures a predetermined time while the power of the car radio is turned on. A measurement data creation / recording means for creating measurement data including a characteristic amount of an audio signal being reproduced on a car radio for a certain period of time from the time and data specifying a current measurement time and recording the measurement data in a memory; Communication means for wirelessly transmitting the measured data to the survey center.

Further, a vehicle GPS receiver and a vehicle G
Means for adjusting the time of the real-time clock based on the reference time acquired from the GPS satellite by the PS receiver. Further, the predetermined measurement start time is at least one in several minutes (for example, one in one minute)
The data which is set and specifies the measurement time is a serial number associated with each measurement start time on a one-to-one basis.

[0014] In the car radio listening state measuring instrument of the present invention thus configured, the vehicle clock means such as a real-time clock whose time is appropriately adjusted according to the reference time from the GPS satellite is provided with the current time. Is accurately timed, and the measurement data creation / recording means determines that the car radio is turned on at a predetermined measurement start time, which always appears once a minute, for example, and that the car radio is turned on / off.
If detected by the detector, the characteristic amount of the audio signal such as voice and music played on the car radio for a certain period of time, for example, 10 seconds from the current measurement start time (for example, logarithm of the average amplitude for each pass band, A measurement data including a converted power vector) and data specifying a current measurement time (for example, a serial number corresponding to the measurement start time on a one-to-one basis) is created and recorded in a memory, and communication means such as a mobile phone is used. Transmits to the survey center at a predetermined time for each vehicle, for example.

Further, the car radio listening state measuring device of the present invention periodically collects geodetic data indicating the position of the own vehicle from the GPS receiver for the vehicle so that the listening place of the car radio can be grasped at the survey center. In order to be able to grasp not only the position and the moving direction and the moving speed but also the reliability as well as the position, and also the reliability of the GPS data for the vehicle, Geodetic data indicating the position of the vehicle from the receiver,
It has a configuration in which moving direction data indicating the moving direction of the own vehicle, moving speed data indicating the moving speed of the own vehicle, and GPS satellite reception state data are periodically collected and transmitted to the survey center together with the measurement data.

In addition, the car radio listening state measuring device of the present invention is provided so that the ratio of the car radio use time during the entire time of boarding the vehicle can be grasped at the survey center, so that the driver can get on the vehicle and get off the vehicle. A detection unit is provided for detecting during boarding, and has a configuration for transmitting data indicating the boarding time and getting off time of the driver together with the measurement data to the survey center.

The car radio listening condition measuring device of the present invention is provided with personal data for inputting data for identifying an individual riding in a vehicle so that a survey center can identify who is listening to the car radio. An input device is provided, and data for identifying an individual in the vehicle is transmitted to the survey center together with the measurement data.

Further, the car radio listening state measuring device of the present invention avoids the risk of the vehicle running out of battery for the car radio listening state measurement, and allows the investigation center to know when the power supply voltage drops. A power supply unit for supplying power to each unit, the power supply unit includes a secondary battery, a charger for charging the secondary battery with a car battery when an ignition switch of a vehicle is turned on, and the secondary battery And a voltage comparator for outputting a battery down signal when the voltage of the vehicle falls below a predetermined value. The secondary battery is charged, and when the ignition switch of the vehicle is turned off, the power of the secondary battery is supplied to each unit. And having a structure for transmitting a down signal to a study center with the measurement data.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing an example of a car radio listening situation survey system according to the present invention. In the figure,
1 is a car radio listening state measuring device mounted on each vehicle as a sample, 2 is a transmitting station of one or more radio stations which are candidates for examining the listening situation, and 3 is a broadcast from a listening candidate radio station 2 The broadcast receiving station 4 is a survey center.

The car radio listening state measuring device 1 is connected to a car radio listening state survey system every time a car radio mounted on the vehicle is powered on. From a predetermined time, the measurement data including the characteristic amount of the reproduced audio signal of the car radio and the data specifying the current measurement time is created and stored, and when a predetermined time is set for each vehicle, the stored series is stored. Is transmitted to the survey center 4 wirelessly.

On the other hand, in the broadcast receiving station 3, the broadcast receiving antenna 31 and the number of candidate radio station receiving tuners 32 installed as many as the number of candidate radio stations are used to transmit a broadcast station which is a candidate for checking the listening situation. A modulated signal of a program mainly composed of audio, music, etc., broadcasted by radio waves from the station 2 is received and demodulated, and the master creation unit 33 determines the measurement time predetermined by the car radio listening situation survey system. Each time it arrives, master data including the characteristic amount of the reproduced audio signal of the candidate radio station receiving tuner 32 over a certain time from that time and data specifying the current measurement time are created for each candidate broadcasting station, The created master data is transmitted to the investigation center 4 by the computer 36. In addition, the GPS receiving antenna 34 and the GPS receiver 3
Reference numeral 5 is for time adjustment of the time counting means in the master creating unit 33. A similar time correction function is provided on each vehicle side.

The investigation center 4 receives the master data for each candidate station sent from the broadcast receiving station 3 by the data communication computer 41, and receives a master DB (database) 4 for each station.
3 is accumulated as station-specific master data. On the other hand, the measurement data sent from each car radio listening state measuring device 1 is as follows:
Similarly, it is received by the data communication computer 41 and sent to the listening station determination computer 42. The listening station determination computer 42 performs matching between the measurement data and the master data for each station, determines which station has been heard, and generates listening determination data. Then, the counting computer 44 statistically processes the listening determination data for each vehicle, and generates and outputs a report 45 such as a radio listening rate on a daily or weekly basis.

The car radio listening situation survey system of the present invention investigates the listening situation of the car radio mounted on each vehicle with the above-described configuration. Hereinafter, details of the car radio listening state measuring device 1, the broadcast receiving station 3, and the investigation center 4 which constitute the system will be described in order.

FIG. 2 is a block diagram showing a configuration example of the car radio listening state measuring device 1. As shown in FIG. 1, a car radio listening state measuring device 1 of the present embodiment includes a system control unit 12 connected to a car radio 11 and a personal data input device 1 connected to the system control unit 12.
3, a GPS receiver 14, a mobile phone 15, and a power supply unit 16 for supplying power thereto.

FIG. 3 is a block diagram showing an example of the configuration of the power supply unit 16. The power supply unit 16 in this example includes an input terminal 161 to which the voltage of the car battery B is applied when the ignition switch IS of the vehicle is turned on, and an output terminal 1 for supplying power to each unit.
62, a diode 163 connected between the input terminal 161 and the output terminal 162, a secondary battery 164,
The charger 165 connected between the secondary battery 164 and the cathode terminal of the diode 163, the diode 166 connected in parallel with the charger 165, and the voltage of the secondary battery 164 are compared with a predetermined voltage. A voltage comparator 167 outputs a battery down signal when the voltage at 164 drops below a predetermined voltage, and an output terminal 168 outputs this battery down signal to the system control unit 12.

When the vehicle is running with the ignition switch IS turned on, the car battery B is constantly charged by the generator of the vehicle. At this time, the electric power of the car battery B is output through the diode 163 to the output terminal 16.
2, each part of the car radio listening state measuring instrument 1 operates on the power of the car battery B. At the same time, the charger 165 uses the electric power of the car battery B to charge the secondary battery 16.
4 is charging. When the vehicle is parked with the ignition switch IS turned off, electric power is supplied from the secondary battery 164 through the diode 166 and the output terminal 162 to each unit of the car radio listening state measuring device. Further, when the voltage of the secondary battery 164 drops below a predetermined voltage, a battery down signal is output from the voltage comparator 167 to the system control unit 12 through the output terminal 168.

FIG. 4A is a front view of a configuration example of the personal data input device 13, and FIG. 4B is an internal block diagram. The personal data input device 13 is attached to a place where the driver can easily operate, such as the lower part of the dashboard. On the front panel, as shown in FIG. 4A, for example, four illuminated personal buttons 1311, for example, two illuminated guest buttons 1312, a melody speaker 1314, a remote control light receiving unit 1315, Are arranged. Each of the individual buttons 1311 is assigned one button at a time to an individual who is scheduled to board a vehicle serving as a sample and whose attributes are grasped in advance at the investigation center. Each button surface may be distinguished by writing a number, or a face illustration may be written. Further, symbols such as guest 1 and guest 2 are described in the guest button 1312.

As shown in FIG. 4B, the personal data input device 13 is provided inside the personal data input device 13.
A CPU 1316 for overall control and its bus 1317
, RAM 1319, interface 1320, key input section 1321, melody sounding section 1322, surface light emitting display section 1323, remote control data receiving section 1325, and remote control data receiving section 1325
And an infrared light receiving unit 1326 connected thereto.
A program and the like necessary for controlling the personal data input device 13 are recorded in the ROM 1318, and the RAM 1319 is used as a work area or the like. Interface 132
Reference numeral 0 denotes an interface portion with the system control unit 12. The key input unit 1321 is a part for inputting information of ON / OFF of the illuminated personal button 1311 and the illuminated guest button 1312. The melody sounding section 1322 is a section that generates a melody for promoting personal data input from the speaker 1314 by driving the speaker 1314 in a predetermined pattern. The surface light emitting display unit 1323 is a part that controls illumination of the buttons 1311 and 1312. The infrared light receiving unit 1326 is a unit that receives infrared light from a remote control device described later, converts the infrared light into an electric signal, and transmits the electric signal to the remote control data receiving unit 1325. Remote control data receiving section 1325 is a section for demodulating this electric signal and receiving data (guest attribute) input from the remote control device.

FIG. 5A is a plan view of a configuration example of a remote control device used in combination with the personal data input device 13, and FIG. 5B is an internal block diagram thereof. The remote controller 17 in this example is a person (guest) other than the individual assigned to the personal button 1311 of the personal data input device 13.
Is used to enter the attributes of the person when the person gets into the vehicle. As shown in FIG. 5A, buttons 1701 and 1702 for inputting a distinction between male and female, and buttons 1703 to 1709 for inputting an age category are provided on the flat panel of remote control device 17. Have been.
Also, as shown in FIG. 5B, a battery 1711 for supplying power to each part of the remote control device and a button 170 are provided inside.
A keyboard 1712 composed of 1 to 1709, an infrared light emitting unit 1714, and a remote control transmitter 1713 for emitting data corresponding to a button pressed on the keyboard 1712 from the infrared light emitting unit 1714 by an infrared signal.
And

FIG. 6 is a block diagram showing an example of the configuration of the car radio 11 and an example of a connection method with the system control unit 12. The car radio 11 of this example uses the superheterodyne method from the AM and FM broadcast frequencies for each I.
AM tuner 111 and FM tuner 112 for converting to F frequency, and AM detector 1 for detecting an IF signal of AM
13 and an FM detector 114 for detecting an FM IF signal
And an audio amplifier 115 that amplifies the output of each of the detectors 113 and 114 and outputs the amplified output to a speaker.

There are the following two methods for extracting a reproduction output signal from the car radio 11 having such a configuration. One is a method using the combiner 116 and the combiner 117, and the other is a method using the combiner 118. A coupler 116 provided between the AM tuner 111 and the AM detector 113 tunes to the IF frequency (for example, 450 KHz) of the AM, and the FM tuner 112 and the FM
The coupler 117 provided between the detection unit 114 and the detection unit 114 tunes to the FM IF frequency (for example, 10.7 MHz), detects leakage of the IF frequency radio wave by electromagnetic induction, and transmits each to the system control unit 12. Coupler 116,
117 is a pickup coil, for example. On the other hand, AM
A coupler 118 provided on the output side of the detection unit 113 and the FM detection unit 114 is a capacitor that directly extracts a detection output and transmits the detection output to the system control unit 12, and is connected by, for example, soldering. In the present invention, any method may be used.

The GPS receiver 14 shown in FIG. 2 receives the signal from the GPS satellite, obtains the position, the moving direction, and the moving speed of the vehicle equipped with the car radio listening state measuring device 1, and receives the signal from the GPS satellite. The data is output to the system control unit 12 in a fixed format together with the reference time and the satellite reception status data. As the GPS receiver 14, for example, an IPS-5000 type G manufactured by Sony Corporation is used.
A PS receiver can be used.

The mobile phone 15 is a communication means for wirelessly transmitting the measurement data to the survey center 4, and any commercially available mobile phone can be used.

FIG. 7 is a block diagram showing a configuration example of the system control unit 12. The system control unit 12 of this example includes a CPU 1211 that controls the main control of the system control unit 12 and a ROM 1213 and a RAM 1 connected to a bus 1212 of the CPU 1211.
214, interfaces 1215 to 1218, RS23
2C interface 1219, periodic detector 1220, 1
226, 1227, car radio ON / OFF detector 12
21, an on-board detection unit 1222, an A / D unit 12 for analog-to-digital conversion of a reproduction output signal from the car radio 11
23, a digital filter section 1224 for converting this digital signal into data for each frequency band by a band filter, and a real-time clock 1225.

An interface 1215 is an interface with the real-time clock 1225, an interface 1216 is an interface for a battery down signal sent from the power supply unit 16, and an interface 1217 is a GP.
An interface with the S receiver 14, an interface 1218 is an interface with the personal data input device 13, and an RS232C interface 1219.
Is an interface with the mobile phone 15.

The ROM 1213 stores programs to be executed by the CPU 1211 and the like. RAM 121
Reference numeral 4 is used for storing a work area and collected band-based data and a series of measurement data.

The real-time clock 1225 is a clock means for providing the current time. The CPU 1211 can obtain the current time from the real-time clock 1225 via the interface 1215, and can correct the time. Further, the current time indicated by the real-time clock 1225 is a
1226, 1227. CPU121
1 periodically executes a process of correcting the current time of the real-time clock 1225 based on the reference time acquired from the GPS receiver 14 via the interface 1217 so that the real-time clock 1225 always clocks the accurate current time. .

The measurement start time predetermined by the car radio listening situation investigation system is set in the periodic detection unit 1220. When the time of the real-time clock 1225 coincides with the measurement start time, the fact and the current time are notified by interruption. The measurement start time is notified to the CPU 1211. As the measurement start time, for example, xx hour, yy minute and 00 second are set. Here, xx and yy are arbitrary hours and minutes. That is, in this example, the measurement is performed once every minute.

The time at which the geodetic data, the moving direction data, the moving speed data, and the satellite receiving state data of the own vehicle are collected from the GPS receiver 14 is set in the fixed time detecting unit 1226, and the time of the real-time clock 1225 is set as the time. If the time matches the time, a CP
Notify U1211. For example, xx
0:00:30, xx: 15: 30, xx: 30: 30
0 seconds and xx: 45: 30 are set. Where xx
Is at any time. That is, in this example, sampling is performed once every 15 minutes.

The time at which the measurement data is sent to the investigation center 4 is set in advance in the regular detection unit 1227, and when the time of the real-time clock 1225 matches the sending time, the fact is notified to the CPU 1211 by an interrupt. As the transmission time, aa, bb, and cc seconds are set. Here, aa, bb, and cc are hours, minutes, and seconds during the transmission time assigned to the car radio listening state measuring device 1 in advance.

The on-board detection section 1222 detects that the driver has boarded the vehicle and that the driver has got off the vehicle. FIG. 8 shows a configuration example of the in-ride detection unit 1222.
Shown in The on-board detection unit 1222 in this example focuses on the point that power is supplied from the car battery B to each part of the vehicle when the ignition switch IS of the vehicle is turned ON to the reserve side or ON to the regular side. By detecting whether the ignition switch IS is on or off by comparing the voltage supplied when the ignition switch IS is on with the reference voltage by the switch 12221, it is possible to approximate that the driver has boarded the vehicle and that the driver has got off the vehicle. Detection. Most of the period in which the driver is in the vehicle is a period in which the vehicle is actually driving or stopped while the engine is running, and the driver is in the vehicle with the ignition switch IS turned off. Since the period is considered to be extremely short, the boarding detection section 1222 having such a simple configuration can detect the driver's boarding or dismounting with a certain degree of accuracy.

It should be noted that the configuration of the on-board detection section 1222 is not limited to the above-described configuration, and any other configuration can be employed. For example, an infrared sensor for detecting whether or not a person is present in the vehicle is installed, a time when the presence of a person is detected in the vehicle by the infrared sensor is detected as a time when the driver gets into the vehicle, and the inside of the vehicle is detected by the infrared sensor. A configuration may be adopted in which the time when the presence of a person is no longer detected is detected as the time when the driver gets off the vehicle.

Next, turning on / off the car radio in FIG.
The detector 1221 is a part that detects whether the main power supply of the car radio 11 is turned on or off. FIG. 9 shows an example of the configuration. Generally, power is supplied to the car radio 11 when the ignition switch IS is turned on. However, a current flows through the power line L that supplies power to the car radio 11 when the main switch MS of the car radio 11 is turned on. .
Therefore, the presence or absence of a current is detected by the current detector 12211 inserted into the power line L, the time when the current starts to flow is detected as the car radio ON time, and the time when the current stops flowing is detected as the car radio OFF time.

Next, FIG. 10 shows an example of the configuration of the A / D section 1223 in FIG. The A / D unit 1223 in this example is an AM-IF
Amplifier 12231, AM detector 12234, FM-IF
An amplifier 12232 and an FM detector 12235 are provided, and a buffer amplifier 12233 is provided. These can be properly used depending on the type of a signal picked up from the car radio 11. That is, the couplers 116 and 117 of FIG.
When an IF high-frequency signal is picked up from the car radio 11 by using the combination of the AM-IF amplifier 12231 and the AM detector 12234 and the FM-IF amplifier 12232 and the FM detector 12235, the sound is output by the coupler 118 in FIG. When the signal is directly picked up, a buffer amplifier 12233 is used. The reproduced output signal of the car radio 11 input as either the IF high-frequency signal or the audio signal is supplied to the level adjusters 12236 to 12238 by the candidate radio station receiving tuner 32 installed in the broadcast receiving station 3.
Are corrected and adjusted to the same frequency-amplitude characteristics at the same output level as. Further, in the A / D converter 12239, the digital signal is sampled and digitized at a sampling frequency of 48 KHz, and the digital signal is
Sent to 4.

Next, FIG. 11 shows an example of the configuration of the digital filter section 1224 shown in FIG. Digital filter section 1 of this example
224 is a four-system digital filter 12241-12.
244 and interfaces 12245 to 12249. Digital filters 12241 to 12244
For example, Yamaha YSS231 can be used. CPU 1211 of the system control unit 12
Are digital filters 12241-1 arranged in parallel via a bus 1212 and an interface 12249.
2244 shows the filter cutoff frequency, Q, gain,
Set parameters such as filter configuration. As the values of these parameters, those determined in advance by the car radio listening situation investigation system are used. The setting of this parameter is
This is performed when the car radio ON / OFF detector 1221 detects the ON state of the car radio 11. A / D section 1
The digital audio signal input from the H.223 is converted into four digital filters 12241 to 12244 arranged in parallel.
Is divided into bands for each pass characteristic. For example,
Each passband is 50-100 Hz, 100-20
0 Hz, 200 to 400 Hz, and 400 to 2400 Hz, and the amplitude data signal for each band is
After being buffered once in 2245-12248, it is transferred to the RAM 1214 via the bus 1212.

FIG. 12 shows an example of the format of the measurement data. In the figure, (a) is a format of measurement data including a feature amount of a reproduced audio signal of the car radio 11, (b) is a format of measurement data including data of the GPS receiver 14, and (c) is a format of other measurement data. Format. The measurement data of (a) is the periodic detection unit 1
Each time the arrival of the measurement start time is detected at 220, the A / D
Unit 1223, Digital Filter Unit 1224 and CPU
Generated by 1211 and stored in a measurement data storage area in RAM 1214. The measurement data of (b) is generated by the CPU 1211 each time the scheduled detection unit 1226 detects the arrival of the collection start time, and is stored in the RAM 1214.
It is stored in the measurement data storage area in the. The measurement data of (c) is generated by the CPU 1211 every time an event such as turning on / off the ignition switch, turning on / off the car radio, getting on / off of an individual and a guest, and the like, is stored in the measurement data storage area in the RAM 1214. Stored. Each measurement data is prefixed with an identifier for identifying the vehicle, and each has the following items.

1) Measurement data including the characteristic amount of the audio signal of the car radio 11 (FIG. 12 (a)) Status: It is determined that the measurement data is the measurement data including the characteristic amount of the reproduced audio signal of the car radio 11. The indicated number is set. That is, the status is as shown in FIG.
There are a total of 16 types as shown in (a), and in the case of the measurement data, a number “5” is set. Time data: Data indicating the measurement time of the measurement data is set, and the content includes a day of the week and a block number. The day of the week is set by a number corresponding to each day of the week as shown in FIG. The block number is a consecutive number assigned from 1. For example, if the predetermined measurement start time in the car radio listening situation investigation system is xx hour yy minute 00 second as described above, the measurement start time 00:00 00: 0
The block number = 1 for the 0 second measurement data, the block number = 2 for the next measurement start time 00:01:00,..., And the block for the measurement data 23:59:00 second measurement start time. The number = 1440 is set respectively. Block data: The feature amount of the audio signal being reproduced on the car radio 11 for a fixed time from the measurement start time is set.

2) Measurement data of the GPS receiver 14 (FIG. 12 (b)) Status: A number "6" indicating that the measurement data is data of the GPS receiver 14 is set. ○ Time data: data indicating the measurement time of the measurement data is set. The contents are day of the week, hour, minute, and second. -Geodetic data: Data indicating the current position of the vehicle obtained by the GPS receiver 14 is set. Movement speed data: Data indicating the movement speed of the vehicle obtained by the GPS receiver 14 is set. Movement direction data: Data indicating the movement direction of the vehicle obtained by the GPS receiver 14 is set. -Satellite reception status data: Data indicating the satellite reception status obtained by the GPS receiver 14 is set.

3) Other measurement data (FIG. 12C) Status: Here, numbers other than the numbers 5 and 6 shown in FIG. 13A are set as the type of the current measurement data. ○ Time data; the time at which the event occurred is set. The contents are day of the week, hour, minute, and second. ○ Personal number; personal button 13 of personal data input device 13
When 11 is turned on and off, a number corresponding to the personal button is set. As the personal number, FIG.
The numbers from 1 to 4 are assigned as shown in FIG. ○ Guest number: When the guest button 1312 of the personal data input device 13 is turned on / off, the number assigned to the guest is set. In this embodiment, up to two guests can be handled. Each guest is numbered 1 and 2. Guest attribute: When a guest attribute is input from the remote controller 17, a number corresponding to the guest attribute is set. As shown in FIG. 13D, there are a total of 14 types of guest attributes, and a number is assigned to each of them. ○ Vehicle type: The type of vehicle as a sample is set. There are a total of five vehicle types as shown in FIG. The type of the vehicle is determined at the start of the survey, and is set as fixed information in the ROM 1213 or the like. ○ Options: Items reserved for future use, not used at present.

Next, the operation of the car radio listening state measuring device 1 will be described for each event.

(1) Turning on the ignition switch When the driver gets on the vehicle and turns on the ignition switch, the on-board detection section 1222 of the system control section 12 detects and notifies the CPU 1211.
Upon receiving this notification, the CPU 1211 accumulates ignition switch ON data as measurement data in the measurement data storage area of the RAM 1214 as shown in FIG. 14 (S1). In the ignition switch ON data, in the format of FIG. 12C, "1" is set for the status, the day of the week and the current time are set for the time data, and the corresponding number is set for the vehicle type. Next, the CPU 1211 issues an instruction to the personal data input device 13 via the interface 1218 to start the operation (S2).

CPU 1316 of personal data input device 13
Receives the above instruction through the interface 1320, activates the melody sounding unit 1322, and simultaneously instructs the surface emitting display unit 1323 to perform a blink operation. As a result, a melody sound for promoting data input flows from the speaker 1314 provided on the front panel of the personal data input device 13, and the personal button 1311 and the guest button 1
The illumination at 312 blinks.

(2) Turning on Personal Buttons When the driver turns on a button assigned to himself out of the four personal buttons 1311 on the front panel of the personal data input device 13, the driver turns on the key input unit 1321. It is detected and notified to the CPU 1316. CPU 131
6 sends a number specifying the pressed individual button 1311 to the system control unit 12 through the interface 1320. In addition, the operation of the melody sounding unit 1322 is stopped, and an instruction is given to the surface light emitting display unit 1323 to turn on only the individual button that is turned on instead of the blinking operation.
As a result, the melody sound for promoting data input and the blinking operation are stopped, and only the pressed individual button is turned on.

CPU 12 of system control unit 12
11 receives the information of the personal button from the personal data input device 13 via the interface 1218,
Is started, it is determined that the received data is the ON signal of the individual button (individual ride) (S11), the individual ride data is generated as the measurement data, and the RAM 121
4 is written to the measurement data storage area (S12). In this personal boarding data, in the format of FIG. 12C, the status is set to “7”, the time data is set to the day of the week and the current time, and the personal number is set to the personal button number notified from the personal data input device 13.

If there is a passenger, the person is
If the person is registered in 311, by turning on the corresponding personal button 1311, the person's personal boarding data is generated as one measurement data as described above, and written into the measurement data storage area of the RAM 1214.

(3) Turning on the guest button On the other hand, if the passenger is a guest not registered in the personal button 1311, the guest button 1312 (guest 1) on the front panel of the personal data input device 13 is turned on (at this time, The button is turned on by the surface light emitting display unit 1323), and the attribute of the guest is input from the remote controller 17. For example, if the passenger is a man in his late 30s,
The male button 1701 and the 31-40 year old button 1707 of the remote controller 17 are pressed. Under the control of the remote control transmitter 1713 of the remote control device 17, the button information is transmitted to the personal data input device 13 by being superimposed on the infrared light by the infrared light emitting portion 1714, and transmitted to the personal data input device 13 by the infrared light receiving portion 1326 of the personal data input device 13. The light is received and the button information is demodulated by the remote control data receiving unit 1325. CPU 1316
Inputs the data of the pressed button from the remote control data receiving unit 1325, stores the data in the work area of the RAM 1319 in association with the pressed button of the guest 1, and sends the data to the system control unit 12 via the interface 1320. . In the processing of FIG. 15, the CPU 1211 of the system control unit 12 determines that the received data is data relating to a guest ride (S11), generates guest ride data as measurement data, and stores the guest ride data in the measurement data storage area of the RAM 1214. Write (S14). In this guest ride data, FIG.
In the format, the status is “9”, the time data is the day of the week and the current time, the guest number is “1”, and the guest attribute is a number corresponding to the button notified from the personal data input device 13 (the above-mentioned third half of the thirties). In the case of a male, “5”) is set.

When there are two guests, the guest button 1312 of the guest 2 is turned on, and an attribute is input from the remote control device 17, whereby guest boarding data is generated and stored as described above.

(4) Turning off the personal button When the passenger gets off, when one of the four personal buttons 1311 on the front panel of the personal data input device 13 is turned off, the key is turned off. It is detected by the input unit 1321 and notified to the CPU 1316. C
The PU 1316 sends a number specifying the turned off individual button 1311 to the system control unit 12 through the interface 1320. In addition, a surface-emitting display unit 1323
To turn off the individual button that has been turned off. When the information of the personal button is received from the personal data input device 13 via the interface 1218, the CPU 1211 of the system control unit 12 determines that the received data is an off signal of the personal button (S11), Generates the getting-off data and stores the data in the RAM 1214
(S13). In the personal drop-off data, in the format of FIG. 12C, the status is set to "8", the time data is set to the day of the week and the current time, and the personal number is set to the personal button number notified from the personal data input device 13. When another passenger gets off the vehicle, the same operation is performed to generate and accumulate the individual getting-off data for the other passenger. It should be noted that the same operation is performed when the driver leaves the vehicle with the engine running, whereby personal drop-off data is generated and stored. However, in this case, it is necessary to perform the registration operation again when returning to the car.

(5) Turning off the guest button When the passenger getting off is a guest, the guest button 1312 (for example, guest 1) that was turned on when the getting off passenger got on is turned off. CPU 1 of personal data input device 13
316 is a guest button 1 by the key input unit 1321.
When 312 is turned off, the RAM1
The guest attribute stored in correspondence with the guest button is read to 319 and sent to the system control unit 12 via the interface 1320. The CPU 1211 of the system control unit 12
On the basis of the data received through the server 18, guest drop-off data is created and stored in the RAM 1214 (S 1 in FIG. 11).
1, S15). The guest drop-off data at this time includes
In the format of 2 (c), the status is "1"
"0", the day of the week and the current time in the time data, "1" in the guest number, and the guest attribute notified from the personal data input device 13 as the guest attribute.

(6) Turning on the car radio In order for the driver or passenger to listen to the car radio 11,
When the main switch is turned on, it is detected by the car radio ON / OFF detector 1221 of the system control unit 12 and notified to the CPU 1211. CPU1211
Starts the process shown in FIG. 16 and generates car radio ON data as one of the measurement data.
4 is written to the measurement data storage area (S21). In the car radio ON data at this time, in the format of FIG. 12C, the status is set to “3”, and the time data is set to the day of the week and the current time. Next, the CPU 1211
Sets parameters in the digital filter unit 1224 (S22), and then internally stores that the car radio 11 has been turned on (S23).

(7) Interruption from the periodic detection unit 1220 When the current time indicated by the real-time clock 1225 reaches a predetermined measurement start time in the car radio listening situation investigation system, the periodic detection unit 1220 detects that, and
The CPU 1211 is interrupted with the current measurement start time. The CPU 1211 executes the processing shown in FIG. 17 when there is this interrupt. First, the periodic detection unit 1220
This time the measurement start time notified from is 00:00:00
It is determined whether or not the time is seconds (S31). If so, the block number b is initialized to 1 (S32), and if not, the block number b is incremented by 1 (S33). Next, it is determined whether or not the car radio 11 is turned on (S34),
If it is not turned on, the current process is terminated. On the other hand,
In the ON state, the data according to the reproduction signal of the car radio 11 is transmitted to the A / D unit 1223 and the digital filter unit 1.
224 (S35), and the feature amount of the reproduced audio signal is calculated based on the collected data (S35).
36), measurement data including this feature amount is created and stored in RAM
1214 is written to the measurement data storage area (S3
7). Hereinafter, the processing of steps S35 to S37 will be described in detail.

When the couplers 116 and 117 are attached to the car radio 11 as shown in FIG.
AM-IF signal, FM picked up at 6,117
The IF signal is supplied to the AM-IF amplifier 12231 and the FM-IF amplifier 1221 of the A / D unit 1223 as shown in FIG.
32, and the subsequent AM detectors 1223
4. The audio signal is generated by being detected by the FM detector 12235. Then, the level adjusters 12236, 12
After the level is adjusted at 237, the A / D converter 12239
For example, the digital signal is converted into a digital signal at a sampling frequency of 48 KHz and input to the digital filter unit 1224. In addition, as shown in FIG.
When the audio signal 18 is attached, the audio signal picked up by the coupler 118 becomes the A signal as shown in FIG.
/ D section 1223, is input to the buffer amplifier 12233, and is level-adjusted by the level adjuster 12238 at the subsequent stage.
For example, the sampling frequency 48
The signal is converted into a digital signal at KHz and input to the digital filter unit 1224. That is, the A / D unit 1223
When the car radio 11 is turned on, the car radio 11
A digital filter section 12 converts a signal obtained by digitizing the audio signal reproduced by
24.

The digital audio signal input from the A / D section 1223 is converted into four digital filters 122 arranged in parallel in a digital filter section 1224.
Bands are divided for each pass characteristic at 41 to 12244, and converted into amplitude data for each pass band. The amplitude data for each of the four passbands is temporarily buffered by the interfaces 12245 to 12248, and then, as the amplitude data for each passband, on the bus 1212.
Through the RAM 1214.

In step S35 in FIG. 17, the data is obtained for each of the four pass bands from the current measurement start time to a time predetermined by the car radio listening status investigation system, for example, 10 seconds. The above amplitude data to R
AM1214. Then, from the stored amplitude data for each of the four pass bands for 10 seconds,
The CPU 1211 calculates the feature amount by executing the following processing in step S36.

First, the amplitude data of the 10-second section is further
The frame is divided into time frames of 00 frames, and each frame is replaced with the average amplitude V _j (i). One frame is 10
This is a 0 ms section. Assuming that the total number of amplitude data collected in the i-th frame period is N, and that the amplitude of the k-th data output from the j-th band filter is S _j (k) in the total number N, the i-th frame period average amplitude V _j of (i) is determined by the following equation (1).

(Equation 1)

Next, the j-th frame section in the i-th frame section
The average amplitude V _j (i) of the output of the band-pass filter is calculated by the following equation (2).
Logarithmic conversion to obtain the power P _j (i).

(Equation 2)

The power P _j (i) is obtained for each of the four bands, and the power vector divided and calculated for the four bands is defined as a power vector P (i).
And this is defined as the feature amount of the i-th frame section.

(Equation 3)

The feature amount of the frame section as described above is 10
The vector of the feature amount of 100 frames obtained for each of the 0 frames is defined as block data CB (i) as in the following equation (4), and this is defined as the feature amount of the audio signal measured this time.

(Equation 4)

As described above, the CPU 1211 performs the block data C shown in the following equation (5) for the unknown radio station R received by the car radio 11 of the vehicle at each measurement time.
B _R (i, b) to produce a.

(Equation 5)

The CPU 1211 converts the obtained measurement data including the characteristic amount CB _R (i, b) of the audio signal into a step S
At 37, the data is written to the measurement data storage area of the RAM 1214. In the measurement data at this time, in the format of FIG. 12A, the status is “5”, the time data is the day of the week and the block number, and the block data is the feature amount C.
B _R (i, b) is set. Here, the updated block number in step S32 or S33 is set as the block number.

(8) Interrupt from the periodic detection unit 1226 The current time indicated by the real-time clock 1225 is GPS
When a predetermined time at which geodetic data or the like is collected from the receiver 14 comes, the periodic detection unit 1226 detects this, and the
U1211 is interrupted. In this interrupt processing, the CPU 1211 obtains reference time, geodetic data, moving speed data, moving direction data, and satellite receiving state data from the GPS receiver 14 via the interface 1217, and stores the measured data including these data in the RAM1.
The data is written to the measurement data storage area 214. The measurement data at this time uses the format shown in FIG. 12B, the status is set to "6", the time data is set to the day of the week and the reference time, respectively.
Geodetic data, moving speed data, moving direction data, and satellite reception status data acquired from the above are set.

(9) Turning off the car radio When the driver or passenger turns off the main switch of the car radio 11, the car radio ON / OFF detector 1221 of the system control unit 12 detects the car radio and the CPU turns off.
1211 is notified. Upon receiving this notification, the CPU 1211 executes the processing of FIG. 18 to generate car radio OFF data as one of the measurement data,
(S51). In the car radio OFF data at this time, in the format of FIG. 12C, “4” is set for the status, and the day of the week and the current time are set for the time data. Also, the fact that the car radio 11 is in the OFF state is stored internally (S5).
2).

(10) Turning off the ignition switch When the driver turns off the ignition switch, it is detected by the boarding detection section 1222 of the system control section 12 and notified to the CPU 1211. CPU1211
Receives this notification, starts the processing shown in FIG. 19, and sets the ignition switch OFF data as measurement data to R.
It is stored in the measurement data storage area of the AM 1214 (S6
1). In the ignition switch OFF data, in the format of FIG. 12C, "2" is set for the status, the day of the week and the current time are set for the time data, and the corresponding number is set for the vehicle type. Next, the CPU 1211 issues an instruction to the personal data input device 13 through the interface 1218 to stop the operation (S62).

CPU 1316 of personal data input device 13
Receives the above instruction through the interface 1320, turns off all the buttons lit by the surface light emitting display unit 1323, and stops the operation.

(11) Interruption from Periodic Detector 1227 The regular detector 1227 of the system controller 12 indicates that the measurement data should be transmitted to the investigation center 4 at a regular time.
Is detected, the CPU 1211 is interrupted,
The CPU 1211 starts the process shown in FIG. First,
Stop data is written to the end of the measurement data group stored in the measurement data storage area of the RAM 1214 (S7).
1). The stop data is obtained by setting the status to “12” and setting the time data to the day of the week and the current time in the format of FIG.

Next, the CPU 1211 instructs the mobile phone 15 to make a call through the RS232C interface 1219 (S72). The mobile phone 15 attempts to make a call to the investigation center 4 and notifies the system control unit 12 of the connection result. When notified of the connection success (YES in S73), the CPU 1211 stores all the measurement data stored in the measurement data storage area of the RAM 1214 as R
The information is sequentially transmitted to the mobile phone 15 through the S232C interface 1219 and transmitted to the investigation center 4 (S7
4). Then, after the transmission is completed, the latest personal ride data and guest ride data are searched for from the measurement data stored in the measurement data storage area of the RAM 1214, and held.
Once the measurement data storage area is cleared (S75), start data is written to the head of the measurement data storage area,
Next, the personal compulsory data and the guest compulsory data are written based on the held personal ride data and guest ride data (S76). Here, in the start data, in the format of FIG. 12C, “11” is set for the status, and the day of the week and the current time are set for the time data. In the personal compulsory data, the status is "1".
3 ", the day of the week and the current time are set in the time data, and the personal number in the stored personal boarding data is set in the personal number. Further, the guest compulsory data indicates that the status is “1”.
4), the day of the week and the current time, the guest number and the guest attribute are set in the time data, and the guest number and the guest attribute in the held guest boarding data are set in the guest data. The personal compulsory data and the guest compulsory data are created by the number of stored personal ride data and guest ride data.

If connection with the investigation center 4 fails because the vehicle is parked in an underground parking lot or is in a remote place where radio waves cannot reach (NO in S73), a wait for a predetermined time is performed. (S77) Then, the connection is attempted again. If the connection is not successful even if the connection is attempted a predetermined number of times, the call from the vehicle stops to avoid discharging the battery. As a countermeasure in this case, a method is conceivable in which the data communication computer 41 of the investigation center 4 attempts to connect to the uncollected vehicle at intervals of, for example, one hour.

FIG. 21 shows an example of the measurement data group stored in the measurement data storage area of the RAM 1214. At the beginning, start data is recorded immediately after the previous scheduled transmission, followed by personal compulsory data and guest compulsory data. After that, measurement data for each event such as ignition switch ON data, personal ride data, guest ride data, car radio ON data, block data, GPS data, guest drop off data, block data, car radio OFF data, ignition switch OFF data, etc. Continue. Then, at the time of the regular transmission, stop data is recorded last, and all the measurement data described above are transmitted collectively.

(12) Battery Down When the voltage of the secondary battery 164 of the power supply section 16 falls below a predetermined value, a battery down signal is output from the voltage comparator 167 to the system control section 12. When the CPU 1211 of the system control unit 12 receives the battery down signal from the power supply unit 16 through the interface 1216, it generates battery down data as one of the measurement data and writes the battery down data in the measurement data storage area of the RAM 1214. In this battery down data, FIG.
In the format, the status is set to "16" and the time data is set to the day of the week and the current time. The battery down data thus written is transmitted to the investigation center 4 together with other measurement data at the next transmission.

(13) Memory Overflow A sufficient capacity is previously secured in the measurement data storage area of the RAM 1214. However, if the free space of the measurement data storage area becomes small, the CPU 1211 sets the memory overflow data as one of the measurement data. To generate R
Write to the measurement data storage area of AM1214. In the memory overflow data, in the format of FIG. 12C, “15” is set in the status, and the day of the week and the current time are set in the time data. The memory overflow data thus written is transmitted to the investigation center 4 together with other measurement data at the next transmission.

Next, the details of the broadcast receiving station 3, which is another component of the car radio listening status examination system of FIG. 1, will be described.

In FIG. 1, the broadcast receiving station 3 arranges with the purchaser of the report 45 prior to conducting the survey on the listening condition of the car radio so that the broadcast receiving station 3 can receive the broadcasts of all the radio broadcasting stations which are the listening candidates. Are installed at one or more locations. The broadcast radio wave obtained by the broadcast receiving antenna 31 is input to a candidate radio station receiving tuner 32 that has a one-to-one correspondence with a candidate radio station, where a broadcast audio signal is reproduced and input to a master creating unit 33. Master creator 3
Each time a predetermined measurement time arrives in the car radio listening situation investigation system, the data 3 specifies the feature amount of the audio signal of the tuner 32 for receiving a candidate radio station over a certain period of time and the current measurement time. Is created for each candidate broadcast station and transmitted to the research center 4 through the data communication computer 36.

FIG. 22 is a block diagram showing a configuration example of the master creating unit 33. The master creating unit 33 in this example includes a CPU 3311 that controls the main control of the master creating unit 33.
Connected to the bus 3312 of the CPU 3311.
ROM 3313, RAM 3314, interface 33
15, 3316, RS232C interface 331
7. A / D units 3318 to perform analog-to-digital conversion of audio signals from tuner 32 for receiving candidate radio stations
3321, a digital filter section 3322 for converting the audio signal converted into a digital signal by the A / D sections 3318 to 3321 into data for each frequency band by a band filter.
, 3325, a periodic detection unit 3327, and a real-time clock 3326.

An interface 3315 is an interface with the real-time clock 3326, an interface 3316 is an interface with the GPS receiver 35, and an RS232C interface 3317 is an interface with the data communication computer 36.

The ROM 3313 stores programs to be executed by the CPU 3311 and the like. RAM 331
Reference numeral 4 is used for temporarily storing work area and collected band-specific data and created master data.

The real-time clock 3326 is a clock means for providing the current time. The CPU 3311 can acquire the current time from the real-time clock 3326 via the interface 3315 and can correct the time. Further, the current time indicated by the real-time clock 3326 is also given to the regular time detection unit 3327. The CPU 3311 operates such that the real-time clock 3326 always clocks the accurate current time.
Based on the reference time acquired from the GPS receiver 35 via the interface 3316, the real-time clock 3
The process of correcting the current time at 326 is periodically performed.

In the regular detection unit 3327, a measurement start time predetermined by the car radio listening situation investigation system is set. That fact and the current measurement start time are
Notify 11 The measurement start time is exactly the same as that of the car radio listening state measuring device 1, and for example, xx hour, yy minute 00 second is set. Here, xx and yy are arbitrary hours and minutes. That is, the measurement is performed once every minute.

Each of the A / D units 3318 to 3321 has the same configuration as the buffer amplifier 12233 and A / D converter 12239 shown in FIG. The sampling frequency of the A / D converter is exactly the same at, for example, 48 KHz. Further, each of the digital filter units 3322 to 3325 has exactly the same configuration as the digital filter unit 1224 shown in FIG.
11, the cutoff frequency, Q,
In accordance with parameters such as a gain and a filter configuration, the amplitude data of each pass band of the audio signal in each band of the candidate radio station is transferred to the RAM 3314 via the bus 3312. In FIG. 22, four sets of the A / D section and the digital filter section are installed in total.
2 is increased or decreased according to the number of units.

Hereinafter, a method of creating master data by the master creating unit 33 will be described.

When the present time indicated by the real-time clock 3326 reaches a predetermined measurement start time in the car radio listening situation investigation system, the regular detection unit 332 detects this.
7 is detected, and along with the current measurement start time, the CPU 331 detects
Interrupt 1 The CPU 3311 executes the processing shown in FIG. 23 when there is this interrupt. First, the current measurement start time notified from the periodic detection unit 3327 is 00
It is determined whether or not it is 0:00:00 (S81). If so, the block number b is initialized to 1 (S82), and if not, the block number b is incremented by 1 (S83). Next, the amplitude data for each pass band of the audio signal from each candidate radio station reception tuner 32 is converted into A / D units 3318 to 3318.
3321 and digital filter sections 3322 to 3325
(S84). The period during which the amplitude data is collected is the same as that of the car radio listening state measuring device 1, and is, for example, 10 seconds. Next, the feature amount of the collected amplitude data for each pass band is calculated for each candidate radio station (S8).
5) Master data including this feature amount is created for each candidate radio station and written to the master data storage area of the RAM 3314 (S86). The master data for each of the candidate radio stations thus stored is sent to the data communication computer 36 through the RS232C interface 3317 when the free space in the master data storage area becomes small, and the data communication computer 36 sends the data to the investigation center. 4 is sent. Hereinafter, the processing of steps S84 to S86 will be described in detail.

A / D corresponding to each candidate radio station on a one-to-one basis
In the units 3318 to 3321, the audio signal from the corresponding candidate radio station reception tuner 32 is amplified by a buffer amplifier, and then converted into a digital signal by an A / D converter at a sampling frequency of 48 KHz, for example. input.

The digital audio signals input from the A / D sections 3318 to 3321 are
In 22 to 3325, the band is divided for each pass characteristic by four digital filters arranged in parallel, converted into amplitude data for each pass band, and converted as amplitude data for each pass band via the bus 3312. RA
M3314 is transferred to the amplitude data storage area for each candidate radio station.

In step S84 of FIG. 23, for each candidate radio station, four times from the current measurement start time to a time predetermined by the car radio listening situation survey system, for example, 10 seconds, elapse. The above amplitude data obtained for each pass band is stored in the RAM 3314. Then, from the stored amplitude data for each of the four pass bands for 10 seconds, the CPU 3311 calculates the feature amount by executing the following processing in step S85.

The amplitude data in the section of 10 seconds is further divided into 100 frames, and the average amplitude V _j (i) of each is calculated by the above-mentioned equation (1). Next, the average amplitude V _{j of the} output of the j-th band filter in the i-th frame section
(i) is logarithmically converted by the above equation (2) to obtain a power P
_j (i) is obtained, and the vector P (i) of the power P _j (i) obtained for each of the four bands as in the above-described equation (3) is set as the feature amount of the i-th frame section. Then, the feature amount of the frame section as described above is obtained for each of the 100 frames, the vector of the feature amount of the 100 frames is defined as block data MB (i), and this is the feature amount of the audio signal measured this time. And That is, the feature amount is obtained by the same processing as that of the car radio listening state measuring device 1 side.

Accordingly, the block data MB _R1 (i) for a certain radio station R1 is defined as shown in the following equation (6).

(Equation 6)

The following equation (7) is obtained by adding the subscript of the block number to the above equation (6) to indicate the block data MB _R1 (i, b) of the block number b in the radio station R1.

(Equation 7)

As described above, the master creating unit 33 creates the block data MB _Rm (i, b) for each listening candidate radio station Rm while monitoring for 24 hours. The station-specific 24-hour block data MB _Rm (i, b) is a station-specific master DB of the investigation center 4.
At 43, the data is accumulated for a certain period during which the judgment calculation is performed. The block data MB _Rm (i, b) for each listening candidate radio station Rm is defined as follows.

(Equation 8)

Next, the details of the investigation center 4 which is the remaining component of the car radio listening situation investigation system of FIG. 1 will be described.

In FIG. 1, when the data communication computer 41 of the research center 4 receives the station-specific 24-hour block data MB _Rm (i, b) from the broadcast receiving station 3, it stores it in the station-specific master DB 43. On the other hand, when a series of measurement data is received from the car radio listening state measuring device 1 mounted on each vehicle, it is transmitted to the listening station determination computer 42. The listening station determination computer 42 uses the block data CB _R (i, b) in the measurement data and the station master DB 4
Matching with the block data MB _Rm (i, b) in 3 is performed to determine which station has been heard, and the determination result is sent to the totaling computer 44 together with other measurement data.

FIG. 24 is a block diagram showing an example of the listening station determination computer 42. The listening station determination computer 42 in this example includes a CPU 421, a memory 422 connected thereto, communication devices 423, 424, an interface 425, and a CPU 421 via the interface 425.
421 and a vehicle-specific file 426 accessible from the vehicle. The interface 425 is connected to the station-specific master DB 43, and is accessible from the CPU 421.

The measurement data of each vehicle sent from the data communication computer 41 is received by the communication device 423, and under the control of the CPU 421, the interface 425
Is stored in a vehicle-specific file 426 provided for each vehicle. The CPU 421 stores the file 4 for each vehicle.
Each time a series of measurement data is stored in the file 26, or when, for example, all the measurement data of the previous day are stored in a plurality of vehicle-specific files 426, the determination process of the listening station is executed for each vehicle.

FIG. 25 is a flowchart showing an example of a listening station determination process performed by the listening station determination computer 42 for each vehicle. First, the CPU 421 extracts all measurement data having a status of “5”, that is, all measurement data including the block data CB _R (i, b) from a series of measurement data stored in the vehicle-specific file 426 to be processed ( S101). Next, attention is paid to the first measurement data in the data (S102), and the following processing is performed.

The master data MB _Rm (i, b) having the same day of the week and the block number of the time data included in the measurement data of interest and the block number are searched from the station-specific master DB 43 (S103), and the measurement of interest is obtained. The block data CB _R (i, b) included in the data and the retrieved master data MB
The distance db (R, Rm) to _Rm (i, b) is calculated (S10
4) The minimum value dbmin is obtained (S105).
Then, the minimum value dbmin and a preset threshold value db
ref (S106), and the minimum value dbmin is set to the threshold value d.
If it is smaller than bref, the radio station located at the distance of dbmin is determined to be the listening station (S107), and the listening station name data Rname (b) including the block number and the listening station name included in the measurement data. Is stored in the determination result area on the memory 422 (S109). On the other hand, the minimum value dbmin
If is not smaller than the threshold dbref, it is determined that a source other than the candidate radio station is being listened to (S108), and the listening radio station including the block number included in the measurement data and the fact that the listening station is another source is determined. The name data Rname (b) is stored in the determination result area on the memory 422 (S109).
The calculation of the distance db (R, Rm) uses a 400-dimensional Euclidean distance, for example, as in the following equation.
Other calculation methods may be used.

(Equation 9)

When the CPU 421 completes the determination process for the measurement data currently focused on, it determines whether there is the next measurement data (S110), and if so, shifts the focus to the next measurement data (S111). Steps S103 to S109
Is repeated. When the processing for all the extracted measurement data is completed, the final determination processing in step S112 is performed. In this final determination processing, for example, the following processing is performed.

The listening radio station name data Rname of each block number b arranged on the judgment result area of the memory 422
In the arrangement of (b), if the same station name appears over consecutive block numbers, it is determined that the user has continuously listened from the first block number to the last block number + 1. Also, while listening to the same station continuously, if the distance dbmin temporarily rises above the threshold dbref, "other sources" appear, and the continuity of the same listening station name is broken. When the divided section is less than the preset number of blocks P, the same listening station is processed as if it has been continuously heard. For example, when the arrangement of the listening radio station name data Rname (b) is as shown in FIG. 26, the determination result of the block number 1003 is “X” indicating “other source”. If the number is less than 2, it is considered that the same listening station “2” has been continuously heard from the block numbers 1000 to 1005. Note that the predetermined block number P is not limited to two, and may be another number such as three.

On the other hand, if the distance dbmin is higher than the threshold value dbref and the predetermined number of blocks P has elapsed, that is, if the determination result of “other source” continues for the predetermined number of blocks P or more, the threshold dbref is exceeded first. With the block number, it is determined that the listening has been switched to a listening station other than the listening candidate radio station. For example, in FIG.
In 1104, since the “other source” is continuous for the predetermined number of blocks P or more, it is determined that the section has been switched to the listening other than the listening candidate radio station. If you want to listen to radio stations other than the candidate radio stations, you can listen to "other radio stations" such as highway radio and community radio, and "music discs and cassettes".
The distinction can be made by adding a “radio listening button” to the personal data input device 13.

Conversely, if the user continuously listens to a station other than the candidate radio station and the distance dbmin temporarily becomes smaller than the threshold value dbref, thereby interrupting the continuity of listening to the stations other than the candidate radio station, If the divided section is less than the set block number P, the processing is performed as if the other radio station than the candidate radio station was continuously heard. For example, the block number 1206 in FIG.
Is the listening station "2", but the predetermined number of blocks P
Since it is less than the block numbers 1203 to 1208, it is processed as if it were heard continuously except for the candidate radio station. If the predetermined number of blocks P has elapsed while the distance dbmin is still smaller than the threshold value dbref, the distance dbmin is assigned the first block number below the threshold value dbref.
It is determined that the radio station corresponding to min has been switched.

If the continuity of the block numbers is interrupted, it means that the car radio has been turned off. Therefore, the last block number + 1 is set as the listening end block number.
For example, in the case of FIG. 26, block numbers 1005 and 1100
Since the continuity of the block numbers is interrupted between the block numbers 1106 and 1200, the block number 1
006 and 1107 are the listening end block numbers, respectively.

In this way, the CPU 421 determines the listening station and determines the continuity of the listening, then converts the listening start block number and the listening end block number into real-time real-time data, and converts the data into the listening station. A name is added, and the day of the week data is further added to create listening judgment data (S
113). FIG. 27 shows the listening radio station name data Rna of FIG.
An example of the listening judgment data corresponding to the sequence of me (b) is shown.

When the CPU 421 creates the listening judgment data as described above, the CPU 421 reads out the other measured data (measured data whose status is other than "5") stored in the vehicle-specific file 426, and reads out the created listening data. The data is sent to the counting computer 44 via the communication device 424 together with the determination data. That is, the block data CB relating to the unknown radio station R being received from the car radio listening state measuring device 1
_{In addition to R} (i, b), various data such as personal data, detection data during boarding, geodetic data, moving direction data, moving speed data, satellite reception state data, car radio ON / OFF data, etc. are transmitted. However, these data pass through the listening station determination computer 42 without processing and are sent to the counting computer 44.

The counting computer 44 refers to the listening judgment data and other measurement data sent from the listening station judging computer 42 to generate and output a report 45 arranged by statistical processing.

The personal data and guest data in the other measurement data indicate the gender and age of the listener, and the detection data while riding indicates the ratio of the car radio usage time during the entire vehicle usage time, geodetic data, movement direction data, and movement. The speed data is an important component of the report 45, which indicates where the vehicle is listening to the car radio.

On the other hand, the satellite reception state data can be used as a material for judging whether or not the reference time is reliable when trying to correct the real-time clock at the GPS reference time in each vehicle and the broadcast receiving station 3. , The totaling computer 44 calculates geodetic data,
It can be used as supplementary data for estimating the accuracy of the moving direction data and the moving speed data. In addition, car radio O
The N / OFF data should originally match the continuity of the block numbers, but can be used as maintenance monitoring data when some operation failure occurs.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various other additions and changes are possible.

For example, as a feature value of an audio signal,
The power vectors obtained by logarithmically converting the average amplitudes of the respective different passbands are employed, but other characteristic amounts may be employed as long as they indicate the characteristics of the audio signal. Further, the audio signal itself or a data obtained by compressing the audio signal can be used as the feature amount.

Although the measurement timing of the GPS data at the car radio listening state measuring device 1 is made different from the measurement timing of the audio signal, both may be measured at the same timing.

Further, the broadcast receiving station 3 is provided independently of the investigation center 4.
The broadcast receiving station 3 may be installed in the survey center 4 as long as it can receive broadcast waves from the Internet.

[0119] In the case where the individual who gets on the vehicle is always specified, it is possible to input the personal information in advance using the personal data input device 13 so that it is not necessary to input the personal information every time the user gets on the vehicle. .

[0120]

As described above, according to the present invention, the following effects can be obtained.

[0121] The determination of the listening station is not carried out on the vehicle side, and the vehicle sends out the characteristic amount of the audio signal reproduced on the car radio, and reproduces this characteristic amount on the reference radio provided on the fixed equipment side. Since the listening station is determined on the fixed equipment side by comparing with the feature amount of the audio signal, the reception sensitivity of the reference radio is not reduced compared to the configuration in which the reference radio is mounted on the vehicle side, and there is no error due to the reduction of the reception sensitivity of the reference radio. There is no judgment.

Since the measurement period of the audio signal being reproduced on the car radio is intermittent and the measurement time is unified for all vehicles in the system, the characteristic amount of the reproduction audio signal of the reference radio serving as the master is continuous for 24 hours. Since it is not necessary to use data, the amount of master data can be reduced, and matching processing can be performed extremely easily.

In a configuration in which a serial number corresponding to each measurement start time is associated one-to-one with each other as data for specifying a measurement time, the data is compared with a case where actual time such as hour, minute, and second is used. , The number of digits of the data indicating the measurement time is reduced,
The time required for extracting the master data to be determined from the master data holding means can be shortened.

Since the timekeeping means on the vehicle side and the timekeeping means at the broadcast receiving station are synchronized with the reference time from the GPS satellite, the measurement timing of the audio signal at all vehicles and at the broadcast receiving station can be accurately matched.

[0125] In a car radio listening condition measuring device which periodically collects geodetic data indicating the position of the vehicle from a GPS receiver for a vehicle and transmits the data to a survey center, the survey center determines the listening position of the car radio. It is possible to create a radio listening rate for each area.

The geodetic data indicating the position of the own vehicle, the moving direction data indicating the moving direction of the own vehicle, the moving speed data indicating the moving speed of the own vehicle, and the GPS satellite reception state data are periodically collected from the vehicle GPS receiver. In the car radio listening condition measuring device which transmits the information to the survey center, the survey center can more accurately grasp the listening place of the car radio, and the accuracy such as the radio listening rate for each area is improved.

A car radio listening state measuring device which includes an in-boarding detection section for detecting the driver getting on and off the vehicle and transmitting data indicating the driver's boarding time and getting off time to the investigation center. In addition, the investigation center can grasp the ratio of the car radio use time during the entire boarding time of the vehicle.

A car radio listening condition measuring device is provided with a personal data input device for inputting data for identifying an individual in a vehicle, and transmitting data for identifying an individual in the vehicle to a survey center. Can determine who is listening to the car radio at the survey center, and can create gender and age-specific radio listening rates.

As a power supply unit, a secondary battery, a charger for charging the secondary battery with a car battery when an ignition switch of the vehicle is turned on, and when a voltage of the secondary battery drops below a predetermined value. And a voltage comparator for outputting a battery down signal. When the ignition switch of the vehicle is turned on, the electric power of the car battery is supplied to each part, and the secondary battery is charged by the charger. When off, 2
In the car radio listening state measuring device that supplies the power of the secondary battery to each unit and transmits the battery down signal to the investigation center, there is a danger that the vehicle may run out of battery due to the car radio listening state measurement. This can be avoided, and when the power supply voltage drops, the fact can be grasped by the investigation center.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of a car radio listening situation survey system of the present invention.

FIG. 2 is a block diagram illustrating a configuration example of a car radio listening state measuring device.

FIG. 3 is a block diagram showing a configuration example of a power supply unit in the car radio listening state measuring device.

FIG. 4 is a front view and an internal block diagram of a configuration example of a personal data input device.

FIG. 5 is a plan view and an internal block diagram of a configuration example of a remote control device.

FIG. 6 is a block diagram illustrating an example of a configuration of a car radio and an example of a method of connecting a system control unit.

FIG. 7 is a block diagram illustrating a configuration example of a system control unit in the car radio listening state measuring device.

FIG. 8 is a block diagram illustrating a configuration example of a boarding detection section.

FIG. 9 is a block diagram illustrating a configuration example of a car radio ON / OFF detector.

FIG. 10 is a block diagram illustrating a configuration example of an A / D unit.

FIG. 11 is a block diagram illustrating a configuration example of a digital filter unit.

FIG. 12 is a diagram illustrating a format example of measurement data.

FIG. 13 is a diagram showing the correspondence between statuses and the like in measurement data and numbers.

FIG. 14 is a flowchart illustrating an example of processing performed by a CPU in a system control unit of the car radio listening state measuring device when an ignition switch is turned on.

FIG. 15 is a flowchart showing an example of processing performed when a CPU in a system control unit of a car radio listening state measuring device receives data from a personal data input device.

FIG. 16 is a flowchart illustrating an example of a process performed by a CPU in a system control unit of the car radio listening state measuring device when the car radio is turned on.

FIG. 17 is a flowchart illustrating an example of a process performed by a CPU in a system control unit of a car radio listening state measuring device when an interrupt is issued from a regular detection unit 1220;

FIG. 18 is a flowchart illustrating an example of processing performed by a CPU in a system control unit of the car radio listening state measuring device when the car radio is turned off.

FIG. 19 is a flowchart illustrating an example of processing performed by a CPU in a system control unit of the car radio listening state measuring device when an ignition switch is turned off.

FIG. 20 is a flowchart illustrating an example of processing performed by a CPU in a system control unit of a car radio listening state measuring device when an interrupt is issued from a periodic detection unit 1227;

FIG. 21 is a diagram showing an example of a measurement data group transmitted from the car radio listening state measuring device to the survey center.

FIG. 22 is a block diagram illustrating a configuration example of a master creating unit of a broadcast receiving station.

FIG. 23 is a flowchart illustrating an example of processing performed by a CPU in a master creation unit of a broadcast receiving station when an interrupt is issued from a regular detection unit.

FIG. 24 is a block diagram illustrating a configuration example of a listening station determination computer of the research center.

FIG. 25 is a flowchart illustrating an example of a listening station determination process performed by the listening station determination computer for each vehicle.

FIG. 26 is a diagram showing an example of arrangement of listening radio station name data of each block number b arranged on a judgment result area in a memory of a listening station judgment computer.

FIG. 27 is a diagram showing an example of listening radio station name data and corresponding listening determination data in FIG. 26;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Car radio listening state measuring device 11 ... Car radio 111 ... AM tuner part 112 ... FM tuner part 113 ... AM detection part 114 ... FM detection part 115 ... Audio amplifier 12 ... System control part 1211 ... CPU 1212 ... Bus 1213 ... ROM 1214 ... RAM 1215-1218 ... Interface 1219 ... RS232C interface 1220, 1226, 1227 ... Periodical detector 1221 ... Car radio ON / OFF detector 12211 ... Current detector 1222 ... Riding detector 12221 ... Voltage comparator 1223 ... A / D part 12231 AM-IF amplifier 12232 FM-IF amplifier 12233 Buffer amplifier 12234 AM detector 12235 FM detector 12236-12238 Level adjuster 12239 A / D conversion Device 1224 Digital filter unit 12241-12244 Digital filter 12245-12249 Interface 1225 Real-time clock 13 Personal data input device 1311 Personal button 1312 Guest button 1314 Speaker 1315 Remote control light receiving unit 1316 CPU 1317 Bus 1318 ... ROM 1319 ... RAM 1320 ... interface 1321 ... key input section 1322 ... melody sounding section 1323 ... surface emitting display section 1325 ... remote control data receiving section 1326 ... infrared ray receiving section 14 ... GPS receiver 15 ... mobile phone 16 ... power supply section 161 ... input Terminal 162 ... Output terminal 163 ... Diode 164 ... Secondary battery 165 ... Charger 166 ... Diode 167 ... Voltage comparator 168 ... Output terminal 17 ... Remote control Places 1701 to 1709 Button 1711 Battery 1712 Keyboard 1713 Remote control transmitter 1714 Infrared light emitting unit 2 Listening candidate radio station transmitting station 3 Broadcast receiving station 31 Broadcast receiving antenna 32 Tuner for candidate radio station receiving 33 Master creation unit 3311 CPU 3312 Bus 3313 ROM 3314 RAM 3315, 3316 Interface 3317 RS232C interface 3318-3321 A / D unit 3322-3325 Digital filter unit 3326 Real-time clock 3327 Regular time detection unit 34 GPS receiving antenna 35 ... GPS receiver 36 ... computer for data communication 4 ... research center 41 ... computer for data communication 42 ... computer for listening station determination 421 ... CPU 422 ... memory 23,424 ... communication device 425 ... interface 426 ... Tsubonebetsu file 43 ... Tsubonebetsu master DB 44 ... aggregate for the computer 45 ... report

Continuation of the front page (72) Inventor Yuichi Aoyama 2-16-7 Ginza, Chuo-ku, Tokyo Inside Video Research Co., Ltd. (72) Inventor Osamu Tsuruta 5-6-16 Ikegami, Ota-ku, Tokyo Dori Ikegami Shinki Co., Ltd.

Claims (13)

[Claims] 1. A method of investigating a listening condition of a car radio mounted on a vehicle, the method comprising: checking a listening condition of a car radio mounted on the vehicle; Every time the measurement start time arrives, create and record measurement data including the characteristic amount of the audio signal being reproduced on the car radio for a certain time from that time and data specifying the current measurement time, The recorded series of measurement data is transmitted to the fixed facility side in a lump, and the fixed facility side receives the predetermined measurement start time from the radio station for each radio station for a predetermined time from that time. Creates master data for each station including the characteristic amount of the audio signal being reproduced by the tuner and data specifying the current measurement time, and measures the data transmitted from each vehicle. Car radio, wherein a listening station at each measurement time of each vehicle is determined by comparing the characteristic amount at each measurement time with the characteristic amount at the same measurement time in the master data of each station created above. Hearing situation investigation method. 2. The method according to claim 1, wherein the predetermined measurement start time is set at least once every several minutes, and the data specifying the measurement time is a serial number associated with each measurement start time on a one-to-one basis. The method for investigating a listening condition of a car radio according to claim 1. 3. A car radio listening situation survey system for examining a listening situation of a car radio mounted on a vehicle, comprising: a plurality of vehicles to be investigated; a broadcast receiving station; and a survey center. Is a vehicle timing means for measuring the current time,
During the period when the power of the car radio is turned on, each time the vehicle clocking means measures a predetermined time, the characteristic amount of the audio signal being reproduced on the car radio for a predetermined time from that time and the current measurement time are determined. Measuring data creation and recording means for creating and recording measurement data including data to be specified, and wireless means for transmitting the recorded measurement data to the survey center, wherein the broadcast receiving station receives the current time. The required timekeeping means, the receiving tuner for each radio station, and each time the receiving station clocking means measures the predetermined time, the time is reproduced by the receiving tuner for each radio station from the time to the predetermined time. A master data creating means for creating station-specific master data including a characteristic amount of an audio signal and data for specifying a current measurement time; Communication means for transmitting data to the research center, wherein the research center is a station-specific master data holding means for holding master data received from the broadcast receiving station; and By comparing the feature quantity of each measurement time with the feature quantity of each station held in the station-specific master data holding means at the same measurement time, a listening station determination means for determining a listening station at each measurement time of each vehicle, A car radio listening status survey system comprising: 4. Each of the vehicles includes a GPS receiver for a vehicle, and means for adjusting the time of a vehicle clocking means of the own vehicle based on a reference time acquired from a GPS satellite by the GPS receiver for the vehicle. 4. The car radio listening situation according to claim 3, wherein the station comprises a GPS receiver for a receiving station, and means for adjusting the time of a clock means for the receiving station based on a reference time acquired from a GPS satellite by the GPS receiver for the receiving station. Survey system. 5. The method according to claim 1, wherein the predetermined measurement start time is set at least once every several minutes, and the data specifying the measurement time is a serial number associated with each measurement start time on a one-to-one basis. The car radio listening status survey system according to claim 3 or 4, wherein: 6. A car radio listening condition measuring device mounted on a vehicle for investigating a listening condition of a car radio mounted on the vehicle, wherein a real time clock for measuring a current time and a power of the car radio are turned on. A car radio ON / OFF detector for detecting whether or not the car radio is turned on, and, while the car radio is powered on, each time the real-time clock measures a predetermined time, the car radio reproduces the sound for a certain time from that time. A measurement data creation and recording means for creating measurement data including the characteristic amount of the audio signal and data specifying the current measurement time and recording the measurement data in a memory; and wirelessly transmitting the measurement data recorded in the memory to a survey center. Communication means for transmitting to a car radio listening state measuring instrument. 7. A vehicle GPS receiver and a vehicle GPS
7. The car radio listening state measuring instrument according to claim 6, further comprising: means for adjusting the time of a real-time clock based on a reference time acquired from a GPS satellite by a receiver. 8. The method according to claim 1, wherein the predetermined measurement start time is set at least once every several minutes, and the data specifying the measurement time is a serial number associated with each measurement start time on a one-to-one basis. The car radio listening state measuring instrument according to claim 6 or 7, wherein: 9. The vehicle according to claim 6, wherein geodetic data indicating the position of the vehicle is periodically collected from the vehicle GPS receiver and transmitted to the survey center together with the measured data. 8. The car radio listening state measuring instrument according to 8. 10. A GPS receiver for a vehicle, geodetic data indicating a position of the own vehicle, moving direction data indicating a moving direction of the own vehicle, moving speed data indicating a moving speed of the own vehicle, GP
9. The car radio listening state measuring instrument according to claim 6, wherein the apparatus has a configuration in which S satellite receiving state data is periodically collected and transmitted together with the measurement data to an investigation center. 11. A configuration comprising an in-vehicle detecting section for detecting a driver getting on and off the vehicle and getting off the vehicle, and transmitting data indicating the driver's getting on and off times together with the measurement data to the survey center. The car radio listening state measuring device according to claim 6, 7 or 8, further comprising: 12. A configuration comprising a personal data input device for inputting data for identifying an individual riding in a vehicle, and transmitting data identifying the individual riding in the vehicle to the survey center together with the measurement data. 9. The car radio listening state measuring instrument according to claim 6, comprising: 13. A power supply unit for supplying power to each unit,
The power supply unit includes a secondary battery, a charger for charging the secondary battery with a car battery when an ignition switch of a vehicle is turned on, and a battery when the voltage of the secondary battery falls below a predetermined value. A voltage comparator that outputs a down signal, when the ignition switch of the vehicle is turned on, the power of the car battery is supplied to each part and the secondary battery is charged by the charger, and when the ignition switch of the vehicle is turned off, 9. The car according to claim 6, further comprising a configuration for supplying power of the secondary battery to each unit, and a configuration for transmitting the battery down signal to a survey center together with the measurement data. Radio listening condition measuring machine.