JP2007094769A - Vehicular signal recording/reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reproduce recording environment when recording a radio frequency signal with higher accuracy than before, in a vehicular signal recording/reproducing device. <P>SOLUTION: This vehicular signal recording/reproducing device has a data recording part 20 recording data; a signal recording/reproducing part 10 receiving a broadcast signal in the environment around a vehicle loading the recording/reproducing device through an antenna 11, and recording the broadcast signal obtained by A/D-converting and digitizing the received broadcast signal into a data recording part 20; a GPS 31 detecting a position of the vehicle; a vehicle speed pulse sensor 41, a gyro sensor 42 and an acceleration sensor 43 for calculating the position, moving direction and speed value of the vehicle; a vehicle position calculation display part 50 calculating movement information (the position, moving direction, speed and time) of the vehicle; and an electronic map output means 60 (a map information output means) outputting map information. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle signal recording / reproducing apparatus.

  In general, in developing receivers for radio frequency signals such as AM broadcasts, FM broadcasts, terrestrial analog TV broadcasts, terrestrial digital TV broadcasts, and mobile broadcasts, it is important to evaluate the performance of the prototype receivers, especially for in-vehicle use. The receiver must perform performance evaluation in a mobile environment, so-called field test.

  However, field tests require a great deal of time and effort for preparation and execution, and are difficult to perform efficiently.

  Therefore, radio frequency signals are received and recorded (recorded) in the actual environment where the receiver is used, and the recorded radio frequency signals are reproduced in a laboratory or the like different from the actual environment, so that the radio environment of the actual environment can be reduced. A signal recording / reproducing apparatus to reproduce has been proposed (Patent Document 1).

According to this technique, the recorded radio frequency signal can be reproduced many times in a laboratory or the like, so that the radio wave environment can be easily reproduced.
Japanese Patent Laid-Open No. 6-265587

  By the way, the radio frequency signal recorded in the actual environment reflects not only the state of the signal itself at the time of recording, but also the state of the recording side, that is, the state of the vehicle side receiving the radio frequency signal.

  For this reason, it is necessary to take into consideration that the environment reproduced in the laboratory by reproducing the recorded radio frequency signal depends on the state of the vehicle at the time of recording.

  In addition, if an environment independent of the state on the vehicle side is to be reproduced, there is a case in which correction processing such as canceling the state of the vehicle at the time of recording is performed.

  In particular, the reception state of the radio frequency signal is considered to vary greatly depending on the relationship between the direction of the antenna that receives the radio frequency signal and the vehicle movement information (especially speed and movement direction).

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle signal recording / reproducing apparatus capable of reproducing a recording environment when a radio frequency signal is recorded with higher accuracy than in the past.

  The vehicle signal recording / reproducing apparatus according to the present invention simultaneously records not only the position of the vehicle but also the movement information including the moving direction and the speed value of the vehicle when recording the radio frequency signal in the environment around the vehicle. Thus, when the recorded radio frequency signal is reproduced, the movement information of the vehicle is reproduced at the same time to improve the reproduction accuracy of the recording environment when the radio frequency signal is recorded.

  That is, the signal recording / reproducing apparatus for a vehicle according to the present invention includes a storage medium for recording information, a radio frequency signal mounted on the vehicle and receiving a radio frequency signal in an environment around the vehicle, and the received radio frequency signal A signal recording unit that records movement information including a position, a moving direction, and a speed value of the vehicle in association with the storage medium, and the radio frequency signal recorded on the storage medium is the radio frequency signal. And a signal reproducing unit that reproduces the information together with the associated movement information.

  According to the vehicle signal recording / reproducing apparatus of the present invention configured as described above, the signal recording unit mounted on the vehicle receives the radio frequency signal in the environment around the vehicle, and at the time of reception, By recording movement information including the position, moving direction, and speed value of the vehicle in a storage medium in association with the received radio frequency signal, it is possible to accurately record the reception environment at the time of receiving the radio frequency signal. The recording information when the radio frequency signal is recorded by the signal reproducing unit correspondingly reproducing the recorded movement information at the time of reproducing the recorded radio frequency (particularly the speed and moving direction of the vehicle). ) Can be reproduced with higher accuracy than in the past.

  Therefore, it is possible to accurately and easily specify the fluctuation factor of the radio frequency signal recording environment.

  In the vehicle signal recording / reproducing apparatus of the present invention, as the movement information acquisition means for acquiring the movement information, the global positioning system (GPS) and the independent positioning means (also referred to as autonomous positioning means. The same applies hereinafter. For example, A vehicle speed sensor, a gyro sensor, an acceleration sensor, etc.), and when the accuracy of movement information measured by the global positioning system does not satisfy a predetermined accuracy set in advance, it is obtained by the autonomous positioning means. The movement information is preferably output as movement information associated with the radio frequency signal.

  GPS is acquired in a multipath environment where not only radio waves from satellites but also indirect waves reflected by buildings are received in recording environments where tall buildings stand. There is a risk that the accuracy of position information and the like may be reduced. In addition, the accuracy of GPS, such as the position information acquired and the speed value calculated by this position information and the required time, is reduced even when the sky in the satellite direction is blocked by buildings, mountains, etc. To do.

  However, according to the signal recording / reproducing apparatus for a vehicle according to the present invention having the above-described preferable configuration, not only the GPS but also a signal from the outside of the vehicle (a radio signal from the GPS) is used as the movement information acquisition means for acquiring the movement information. In addition, since it is provided with a self-supporting positioning means (for example, a vehicle speed sensor, a gyro sensor, and an acceleration sensor) that can detect movement information without depending on the accuracy of the movement information measured by GPS, a predetermined value is set in advance. If the accuracy is not satisfied, the movement information obtained by the self-supporting positioning means is recorded in association with the radio frequency signal, thereby reducing the reproduction accuracy of the reception environment due to a decrease in measurement accuracy by GPS. Can be prevented.

  In the vehicle signal recording / reproducing apparatus of the present invention, it is preferable that the signal recording unit synchronizes reception of the radio frequency signal and acquisition of the movement information.

  According to the vehicle signal recording / reproducing apparatus having such a preferable configuration, the signal recording unit can easily associate the radio frequency signal with the movement information by synchronizing the reception of the radio frequency signal and the acquisition of the movement information. Can be.

  The vehicle signal recording / reproducing apparatus of the present invention further includes map information output means for outputting map information, and the signal reproducing unit outputs the movement information recorded on the storage medium from the map information output means. It is preferable to reproduce by superimposing on the map information.

  According to the vehicle signal recording / reproducing apparatus having a preferable configuration as described above, when the signal reproducing unit reproduces the vehicle movement information recorded in the storage medium in association with the radio frequency signal, the movement information is Since it is reproduced by being superimposed on the map information output by the map information output means, the moving direction and speed of the vehicle can be visually reproduced on the map and can be easily understood intuitively.

  In the vehicle signal recording / reproducing apparatus of the present invention, the signal recording unit also stores the map information output from the map information output means in correspondence with the movement information when recording the radio frequency signal. May be recorded.

  In the vehicle signal recording / reproducing apparatus of the present invention, it is preferable that the direction of the antenna mounted on the vehicle and receiving the radio frequency signal is associated with the moving direction of the vehicle in advance.

  According to the vehicle signal recording / reproducing apparatus having a preferable configuration as described above, the direction of the antenna can be specified based on the movement direction among the movement information recorded in association with the radio frequency signal. The correspondence relationship between the direction of the antenna and the reception state of the recorded radio frequency signal can be analyzed in detail when reproducing the radio frequency signal and the movement information.

  According to the vehicle signal recording / reproducing apparatus of the present invention, the recording environment when the radio frequency signal is recorded can be reproduced with higher accuracy than before, and the variation factor of the radio frequency signal reception environment can be accurately determined. And can be easily identified.

  Hereinafter, a vehicle signal recording and reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  Here, in the present embodiment, a broadcast signal (RF signal) such as radio sound is applied as a radio frequency signal.

  As shown in FIG. 1, the vehicle signal recording / reproducing apparatus 100 according to the present embodiment receives a data recording unit 20 (storage medium) for recording data (information) and broadcast signals in an environment around the vehicle on which the vehicle is mounted. A signal recording / reproducing unit 10 (signal recording unit and signal reproducing unit) that receives the broadcast signal received from the antenna 11 and records the received broadcast signal into a data recording unit 20 by A / D converting the digitized broadcast signal. A GPS 31 for detecting the position information of the vehicle, a vehicle speed pulse sensor 41 provided in the vehicle for independently calculating the position, moving direction, and speed value of the vehicle without using the GPS 31 data, a gyro A sensor 42 and an acceleration sensor 43. These GPS 31, vehicle speed pulse sensor 41, gyro sensor 42 and acceleration sensor 43 The output signal is input, and the vehicle movement information (position, movement direction, speed) is calculated based on the input data from the GPS 31 and the built-in clock information, and the vehicle speed pulse sensor 41, gyro A vehicle position calculation display unit 50 that calculates movement information (position, movement direction, and speed) of the vehicle according to the vehicle speed, direction, and acceleration input from the sensor 42 and the acceleration sensor 43, respectively, and map information (computerized) Electronic map output means 60 (map information output means) for outputting (map data).

  Here, the GPS 31 functions as a first movement information acquisition unit for obtaining vehicle movement information as described above.

  Further, unlike the GPS 31, the vehicle speed pulse sensor 41, the gyro sensor 42, the acceleration sensor 43, and the vehicle position calculation display unit 50 receive only data from the sensors 41 to 43 without receiving data from the outside of the vehicle. Independent positioning means for calculating the movement information of the vehicle is configured based on these, and these also function as second movement information acquisition means for obtaining the movement information of the vehicle.

  And, for example, when traveling in tunnels or underpasses, when it is not possible to receive positioning radio waves from satellites, or in a multipath environment where positioning radio waves are reflected and detected by buildings, etc. In the case where the accuracy of the movement information measured by the GPS 31 does not satisfy the predetermined accuracy set in advance, the vehicle position calculation display unit 50 replaces the movement information obtained by the GPS 31 with the second described above. The movement information obtained by the independent positioning means, which is the movement information acquisition means, is output.

  In addition, when the accuracy of the movement information measured by the GPS 31 satisfies a predetermined accuracy set in advance, the vehicle position calculation display unit 50 outputs the movement information obtained by the GPS 31.

  The signal recording / playback unit 10 transmits a recording start signal to the vehicle position calculation display unit 50, thereby receiving a timing at which a broadcast signal is received by the antenna 11 and a timing at which movement information is output from the vehicle position calculation display unit 50. The broadcast signal and movement information acquired in synchronization with each other are associated with each other and recorded in the data recording unit 20.

  The antenna 11 is installed in the vehicle in a direction corresponding to the moving direction of the vehicle, that is, the direction of the vehicle in advance, and the vehicle position calculation display unit 50 has a correspondence relationship between the moving direction of the vehicle and the direction of the antenna 11 in advance. The vehicle position calculation display unit 50 is stored, and the orientation of the antenna 11 is automatically calculated corresponding to the moving direction of the vehicle, and the correspondence between the orientation of the antenna 11 and the reception sensitivity of the broadcast signal is reproduced. Can be reproduced sometimes.

  Further, the map information corresponding to the position of the vehicle obtained by the vehicle position calculation display unit 50 is output from the electronic map output means 60. This map information is also associated with the broadcast signal together with the movement information, and the data record Part 20 is recorded.

  The signal recording / playback unit 10 not only records information in the data recording unit 20, but also records the broadcast signal and movement information recorded in association with the data recording unit 20 while maintaining the correspondence. 20, the broadcast signal is converted into the original broadcast signal when received, and then supplied to the device under test (for example, AM / FM receiver) 200.

  On the other hand, the movement information recorded in association with the broadcast information is output to the vehicle position calculation display unit 50 and displayed as the position of the vehicle, the movement speed, the movement direction, and the required time (or time) as necessary. Is done.

  In addition, since the map information was matched with the position among this movement information in the movement information recorded in association with the broadcast information, the position of the vehicle in the movement information read from the data recording unit 20 Is displayed superimposed on the corresponding map information, and the moving direction and speed of the vehicle can be visually reproduced on the map, making it easy to understand intuitively.

  Next, the operation of the broadcast signal recording by the vehicle signal recording / reproducing apparatus 100 according to the present embodiment will be described.

  First, in order to record a broadcast signal by a field test, the vehicle signal recording / reproducing apparatus 100 is mounted on the vehicle and moves to the broadcast signal recording target area together with the vehicle.

  Then, while traveling in the area to be recorded by the vehicle, the broadcast signal received by the signal recording / reproducing unit 10 via the antenna 11 is digitized and sequentially recorded in the data recording unit 20. In synchronization with the recording, the signal recording / playback unit 10 transmits a recording start signal to the vehicle position calculation display unit 50 so that the vehicle position calculation display unit 50 acquires and records vehicle movement information.

  Upon receipt of the recording start signal, the vehicle position calculation display unit 50 receives the recording start signal and outputs the absolute position signal output from the GPS 31 (absolute position signal) and the rotation of the axle output from the vehicle speed pulse sensor 41. A signal representing the angle (rotation angle signal), a signal representing the turning angular velocity of the vehicle output from the gyro sensor 42 (turning angular velocity signal), a signal representing the translational acceleration of the vehicle output from the acceleration sensor 43 (translational acceleration signal), And the required time (or time) is acquired by a clock built in the vehicle position calculation display unit 50, and vehicle movement information (position, movement direction and (Movement speed and time) are calculated.

  Further, the vehicle position calculation display unit 50 outputs the map information corresponding to the calculated vehicle movement information from the electronic map output means 60 and takes it in.

  Then, the vehicle position calculation display unit 50 associates the calculated vehicle movement information and map information with the recorded broadcast signal in synchronization with the recording of the broadcast signal in the data recording unit 20, and stores the data. Records in the recording unit 20.

  As a result, the broadcast signal received by the field test is recorded in the data recording unit 20 in association with the vehicle movement information and the map information.

  When the signal recording / reproducing unit 10 finishes recording the broadcast signal, the signal recording / reproducing unit 10 transmits a recording end signal to the vehicle position calculation / display unit 50, and the vehicle position calculation / display unit 50 outputs the recording end signal. At the received timing, the acquisition of the movement information of the vehicle and the recording to the data recording unit 20 are finished.

  In addition, when the accuracy of the movement information measured by the GPS 31 satisfies a predetermined accuracy set in advance, the vehicle position calculation display unit 50 is based on the absolute position signal obtained by the GPS 31 and the required time. The calculated position, speed, direction of movement, etc. are used as movement information to be recorded. When the accuracy of the movement information measured by the GPS 31 does not satisfy a predetermined accuracy, the vehicle position calculation display unit 50 Instead of the movement information obtained by the GPS 31, the position, speed, movement direction, and the like calculated by the above-described independent positioning means are used as movement information to be recorded.

  Next, the operation at the time of reproduction of the broadcast signal recorded by the vehicle signal recording / reproducing apparatus 100 according to the present embodiment will be described.

  Unlike the field test, the broadcast signal is reproduced as a bench test for reproducing the broadcast signal recorded in the data recording unit 20 in a laboratory or the like.

  First, when the signal recording / reproducing unit 10 is connected to the RF input terminal of the device under test 200 and sequentially receives digitized broadcast signals recorded in the data recording unit 20 and receives them after D / A conversion. And then output to the device under test 200.

  The device under test 200 detects this analog broadcast signal input from the RF input terminal as having been received directly from the antenna 21, and the input broadcast signal is recorded via the antenna 11 in a field test. Therefore, the test apparatus 200 can be evaluated as the same test as that used for the field test, despite the bench test.

  Here, the signal recording / reproducing unit 10 receives and records the broadcast signal to the vehicle position calculation display unit 50 in synchronization with the reading of the broadcast signal from the data recording unit 20 and the output to the device under test 200. A reproduction start signal is transmitted to the vehicle position calculation display unit 50 so that the movement information and map information of the corresponding vehicle are read from the data recording unit 20 and displayed.

  Upon receiving the reproduction start signal, the vehicle position calculation display unit 50 reads the vehicle movement information and map information from the data recording unit 20, displays the movement information as numerical values, for example, and map information corresponding to this movement information In addition, an indicator such as a vehicle mark representing the vehicle is superimposed and displayed.

  When the vehicle position calculation / display unit 50 displays vehicle movement information and map information, the signal recording / reproducing unit 10 synchronizes with the output of the corresponding broadcast signal.

  When the signal recording / reproducing unit 10 ends the reproduction of the broadcast signal, the signal recording / reproducing unit 10 transmits a reproduction end signal to the vehicle position calculation / display unit 50, and the vehicle position calculation / display unit 50 outputs the reproduction end signal. At the received timing, the reading and display of vehicle movement information from the data recording unit 20 is terminated.

  Thus, according to the vehicle signal recording / reproducing apparatus 100 according to the present embodiment, the corresponding movement information (in the moving direction of the vehicle) when the broadcast signal input to the device under test 200 is recorded in the field test. And the map information is displayed on the vehicle position calculation display unit 50, and the recording environment in the field test of the broadcast signal corresponding to the movement information is displayed on the vehicle position calculation display unit 50. , The behavior and performance of the device under test 200 when the broadcast signal is input can be tested and evaluated.

  Moreover, since the displayed movement information includes not only the position of the vehicle but also the moving direction of the vehicle, that is, the direction of the antenna 11, the speed and acceleration of the vehicle, the recording environment is reproduced more accurately than before. A test can be performed.

  Further, according to the vehicle signal recording / reproducing apparatus 100 according to the present embodiment, the signal recording / reproducing unit 10 synchronizes the reception of the broadcast signal and the acquisition of the movement information, thereby associating the broadcast signal with the movement information. Can be made easier.

  Furthermore, according to the vehicle signal recording / reproducing apparatus 100 according to the present embodiment, the direction of the antenna 11 is specified based on the moving direction of the vehicle among the moving information of the vehicle recorded in association with the broadcast signal. Thus, the correspondence relationship between the direction of the antenna 11 and the reception state of the recorded broadcast signal can be analyzed in detail when the broadcast signal and the movement information are reproduced.

  Further, according to the vehicle signal recording / reproducing apparatus 100 according to the present embodiment, not only the GPS 31 but also a signal from the outside of the vehicle (a radio signal from the GPS 31) is not used as the movement information acquisition means for acquiring movement information. 2 is provided with a self-supporting positioning means including a vehicle speed pulse sensor 41, a gyro sensor 42, and an acceleration sensor 43 that can detect movement information, the accuracy of movement information measured by the GPS 31 is set to a predetermined accuracy. If the above condition is not satisfied, the movement information obtained by the self-supporting positioning means is recorded in association with the broadcast signal, and this reduces the reproduction accuracy of the broadcast signal recording environment due to a decrease in measurement accuracy by the GPS 31. Can be prevented.

  Note that the signal recording / reproducing apparatus 100 for a vehicle according to the present embodiment includes a single signal recording unit for recording a broadcast signal and a signal reproducing unit for reproducing a broadcast signal in order to make the configuration compact. Although configured as the reproduction unit 10, a configuration in which both units are configured separately can be adopted.

  Further, the transmission of the recording start / end signal and the reproduction start / end signal from the signal recording / reproducing unit 10 to the vehicle position calculation / display unit 50 may not be performed by a control signal. It may be by exchanging.

  The vehicle signal recording / output device 100 according to the present embodiment records the broadcast signal and the movement information of the vehicle in association with each other, and is synchronized because both are reproduced. By creating a database of broadcast signals and vehicle movement information, it is possible to omit the signal lines for transmitting the reproduction start / end signals from the signal recording / reproduction unit 10 to the vehicle position calculation display unit 50.

  Further, the signal recording / reproducing device 100 of the present embodiment may be configured by connecting the signal recording / reproducing unit 10 (including the antenna 11) and the data recording unit 20 to the configuration of a commercially available car navigation system. It can be configured at low cost by using the car navigation system.

It is a block diagram which shows the structure of the signal recording / reproducing apparatus for vehicles which concerns on one Embodiment of this invention.

Explanation of symbols

10 Signal recording / playback unit (signal recording unit, signal playback unit)
11 Antenna 20 Data recording unit (storage medium)
31 GPS (Global Positioning System)
41 Vehicle speed pulse sensor (independent positioning means)
42 Gyro sensor (independent positioning means)
43 Acceleration sensor (independent positioning means)
50 Vehicle position calculation display (global positioning system, independent positioning means)
60 Electronic map output means (map information output means)
100 Vehicle Signal Recording / Reproducing Device 200 Machine Under Test

Claims (5)

A storage medium for recording information;
The radio frequency signal mounted on the vehicle and receiving the radio frequency signal in the environment around the vehicle is received, and the received radio frequency signal and the movement information including the position, moving direction, speed value, and time of the vehicle are stored in the memory. A signal recording unit for recording in association with a medium;
A signal recording / reproducing apparatus for a vehicle, comprising: a signal reproducing unit that reproduces the radio frequency signal recorded on the storage medium together with the movement information associated with the radio frequency signal.   When the movement information acquisition means for acquiring the movement information includes a global positioning system and an independent positioning means, and the accuracy of the movement information measured by the global positioning system does not satisfy a predetermined accuracy set in advance. The vehicle signal recording / reproducing apparatus according to claim 1, wherein the movement information obtained by the self-supporting positioning unit is output as movement information associated with the radio frequency signal.   The vehicle signal recording / reproducing apparatus according to claim 1, wherein the signal recording unit synchronizes reception of the radio frequency signal and acquisition of the movement information. It further comprises map information output means for outputting map information,
The said signal reproduction | regeneration part superimposes and reproduces | regenerates the said movement information recorded on the said storage medium on the said map information output from the said map information output means, The one of Claim 1 to 3 characterized by the above-mentioned. 2. A signal recording / reproducing apparatus for a vehicle according to item 1. The direction of the antenna which is mounted in the said vehicle and receives the said radio frequency signal, and the moving direction of the said vehicle are matched previously, The any one of Claim 1 to 4 characterized by the above-mentioned. Vehicle signal recording / reproducing apparatus.

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