JP3575121B2 - In-vehicle data recorder - Google Patents

Description

[Industrial applications]
The present invention relates to an in-vehicle data recorder, and more particularly to an in-vehicle data recorder that detects vehicle information and records it on a recording medium.
[0001]
[Prior art]
Examples of the use of the in-vehicle data recorder as described above include: (1) Information on a vehicle or a driver until immediately before the accident, for example, vehicle speed, braking state, steering angle, awakening of the driver, for investigating the cause of the accident. Drive recorder for picking up and recording data such as degree and analyzing / evaluating quickly, and (2) real-time applied to algorithm development tools for various alarm devices, vibration analysis / combustion analysis / destruction test, etc. An example is an analysis data recorder.
[0002]
FIG. 15 shows a conventional example of the in-vehicle data recorder (1). The vehicle speed signal from the vehicle speed sensor 11, the steering angle signal from the steering angle sensor 12, the brake signal from the brake sensor 1n, and the like. Is supplied to an A / D converter 15 via an interface circuit (I / F) 14 and converted from an analog signal to a digital signal under the control of the control unit 16 and stored in a buffer memory 17 which is also controlled by the control unit 16 I do.
[0003]
The data stored in the buffer memory 17 is recorded on a recording medium 18, such as a DAT or an audio tape, which is controlled by the control unit 16.
[0004]
[Problems to be solved by the invention]
In the above-described data recorder for vehicle, if the situation in front of the vehicle and the situation of the driver can be recorded together with the sensor output signal, it is extremely effective for accident tracing, situation analysis and evaluation.
[0005]
A data recorder capable of simultaneously inputting audio signals has already been put to practical use, but a data recorder capable of simultaneously recording video signals has not been realized.
[0006]
That is, there are various types of input signals of the data recorder, such as a vehicle speed signal, a steering angle signal, an engine speed signal, and the like, but these signals are common to a one-dimensional time series signal, that is, there is no intermediate synchronization signal. It is a signal that is continuous in time.
[0007]
On the other hand, the video signal is a two-dimensional synchronization signal in which the vertical synchronization signal and the horizontal synchronization signal are mixed according to the TV standard.The video information is a special signal included in the video display period outside the synchronization signal. Can not connect to the data recorder.
[0008]
When it is absolutely necessary to use the video signal, as shown in FIG. 16, the output signals of the sensor group 1 including the sensors 1-1 to 1-n are recorded as data in the data recorder 30, and the recorded data is stored in various types. At the same time, the video signal from the TV camera 2 is recorded on the VTR 6 at the same time as the video signal is reproduced on the recording device or the analysis device 8, and the recorded video signal is reproduced on the TV monitor 7.
[0009]
However, since the data recorder 30 and the VTR 6 are asynchronous, there is a problem that it is difficult to time the sensor signal and the video signal, which is inconvenient for data analysis.
[0010]
Therefore, the present invention realizes an in-vehicle data recorder capable of synchronously recording a video signal from a TV camera mounted on a vehicle and vehicle information from at least one sensor and simultaneously reproducing the same. With the goal.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a part of the video signal from the TV camera is crushed in combination with a recording medium such as a commercially available VTR, and one-dimensional information from the sensor is written in this area, so that only the VTR is used. An in-vehicle data recorder capable of recording and reproducing data is proposed.
[0012]
FIG. 1 conceptually shows an in-vehicle data recorder according to the present invention, in which a sensor signal from a sensor group 1 comprising at least one sensor for detecting vehicle information and a signal from a TV camera 2 mounted on the vehicle. The video signal and the video signal are collected via the encoder unit 4 constituting the data recorder 3 and recorded on the VTR 6 as a recording medium.
[0013]
Specifically, the encoder unit 4 detects the horizontal synchronization signal and the vertical synchronization signal of the TV camera, and writes the selection signal of the sensor and the number of the sensors within one cycle of the horizontal synchronization signal. Synchronization control for generating a read pulse in which the number of read pulses per frame, which is pre-assigned according to the pulse and the write position in the video area, is equal to the number of write pulses, a pilot signal after detection of the horizontal synchronization signal, and a camera / sensor selection signal A / D conversion means for sequentially sampling the output signal of the sensor in the one cycle according to the sensor selection signal and outputting as parallel data, a memory for storing the parallel data in accordance with the write pulse and reading in accordance with the read pulse A serial / parallel converter for converting parallel data from the memory into serial data in accordance with the read pulse; A combining unit that combines the pilot signal and the serial data into sensor data corresponding to the black and white level of the video signal of the TV camera; and a camera / sensor selection signal. An analog switch that switches between the sensor data and the video signal so that the sensor data of the attenuation means is displayed in a predetermined area of the video signal and records the mixed data on a recording medium as a mixed video signal.
[0014]
The data recorded on the VTR 6 is also reproduced in a synchronized manner on the TV monitor 7 or various recording devices or analysis devices 8 via the decoder 5 constituting the data recorder 3.
[0015]
Specifically, the decoder unit 5 detects the horizontal synchronizing signal and the vertical synchronizing signal from the mixed video signal recorded on the recording medium, and within one cycle of the horizontal synchronizing signal, the same as the encoder unit. A synchronous control unit for generating a write pulse whose number of write pulses per frame is previously equal to the number of read pulses, the number of read pulses being equal to the number of sensor selection signals, the number of read sensors, and the write position in the video area; Means for detecting the pilot signal in the signal to extract the subsequent sensor data, serial / parallel conversion means for converting the sensor data into the parallel data by the read pulse, and converting the parallel data according to the write pulse. A memory section for storing and reading in accordance with the read pulse; and a D / A for converting parallel data in the memory section into a corresponding analog reproduction signal in accordance with the sensor selection signal. It is composed of a switching means, and at the same time give a mixed video signal recorded on the recording medium to the TV monitor, and outputs a reproduced signal of the sensor.
[0016]
Note that the above memory unit can be reset based on the vertical synchronization signal.
[0017]
[Action]
In the encoder section of the on-vehicle data recorder according to the present invention, the synchronization control section detects a horizontal synchronization signal and a vertical synchronization signal in a video signal from a TV camera mounted on the vehicle, and detects the sensor within one cycle of the horizontal synchronization signal. And the number of write pulses equal to the number of the sensors and the number of read pulses per frame, which is preliminarily assigned by the write position in the video area, is equal to the number of write pulses, and the pilot after the detection of the horizontal synchronizing signal. Generate a signal and a camera / sensor selection signal.
[0018]
Among them, the sensor selection signal is supplied to the A / D converter, the write pulse and the read pulse are supplied to the memory unit, the read pulse is also supplied to the parallel / serial converter, and the pilot signal is supplied to the synthesizer. , A camera / sensor selection signal is provided to an analog switch.
[0019]
The A / D converter sequentially samples the sensor output signal within one cycle of the horizontal synchronizing signal according to the sensor selection signal, converts it into data for each sensor, and sends this data to the memory unit.
[0020]
The memory unit sequentially stores the sensor data within one cycle of the horizontal synchronization signal according to the write pulse, and reads the sensor data according to the read pulse.
[0021]
In this case, the read pulse is such that the number of write pulses per frame, which is pre-assigned according to the write position to the video area, is equal to the number of read pulses, within one cycle of the horizontal synchronizing signal. The number of read sensor data (the number of write pulses + the predetermined number) may be selected so that the sensor data is displayed only in a predetermined area of the TV screen.
[0022]
Since the sensor data read from the memory unit is parallel data, the parallel / serial conversion unit converts the data into serial data and outputs the serial data.
[0023]
On the other hand, after detecting the horizontal synchronizing signal, the synchronizing control section generates a pilot signal and synthesizes the output data of the parallel / serial conversion means with the synthesizing section. After the detection, the pilot signal is first sent to the attenuating means via the synthesizing section, and then the serial data from the parallel / serial conversion means is sent to the attenuating means via the synthesizing section, and the attenuating means respectively uses the recording medium. Is converted into data corresponding to the black and white level of the image signal and sent to the analog switch.
[0024]
In the analog switch, a video signal from the TV camera or sensor data which is output data from the attenuating means is switched by a camera / sensor selection signal (a selection signal based on a horizontal synchronization signal and a vertical synchronization signal) from the synchronization control unit and recorded. Give to the medium.
[0025]
However, in this case, the selection signal controls the analog switch so that the sensor data from the attenuating means is displayed only in a predetermined area of the TV screen, so that the video signal and the sensor data are synchronized on the recording medium. Will be recorded.
[0026]
After the video signal and the sensor data are synchronously recorded on the recording medium by the encoder unit as described above, when the video signal and the sensor data are reproduced, the recording medium is output to the TV monitor via the decoder unit.
[0027]
In such a decoder section, the synchronization control section detects a horizontal synchronization signal and a vertical synchronization signal from the video signal recorded on the recording medium in the same manner as the synchronization control section of the encoder section, and within one cycle of the horizontal synchronization signal. The sensor selection signal, the number of read pulses corresponding to the number of the sensors, and the number of write pulses smaller by a predetermined number than the number of the write pulses are generated.
[0028]
Among them, the write pulse and the read pulse are supplied to the memory unit, the read pulse is also supplied to the serial / parallel converter, and the sensor selection signal is supplied to the D / A converter.
[0029]
Then, the extracting means detects a pilot signal inserted into the mixed video signal recorded on the recording medium, extracts sensor data following the pilot signal, and supplies the sensor data to the serial / parallel converting means.
[0030]
The serial / parallel converter converts the serial data into parallel data and supplies the parallel data to the memory unit. The memory unit stores the parallel data according to the write pulse and reads the parallel data according to the read pulse.
[0031]
In this memory section, the write pulse and the read pulse are just opposite to the write pulse and the read pulse of the memory section in the encoder section, and the read pulse is generated in one cycle by the number of sensors. The number of write pulses per frame, which is preliminarily assigned according to the write position in the video area, is equal to the number of read pulses.
[0032]
Therefore, by exactly the reverse process, the sensor data displayed only in a predetermined area of the TV screen is read out as parallel data corresponding to the number of sensors in one cycle of the horizontal synchronization signal, and the D / A conversion means is provided. , And is sampled based on the sensor selection signal and output as an analog reproduction signal corresponding to each sensor.
[0033]
At this time, since the video signal recorded on the recording medium passes through the decoder section and is output to the TV monitor, the image displayed on the TV monitor and the analog reproduction signal output from the D / A conversion means are output. Will be output (displayed) in synchronization with.
[0034]
【Example】
FIG. 2 shows an embodiment of an encoder unit constituting a vehicle-mounted data recorder according to the present invention. In this embodiment, eight sensors 1-1 to 1-8 are used, and output signals of these sensors are output. The signal is supplied to a multiplex A / D converter 41, which performs analog / digital conversion for each sensor (each channel) and outputs 8-bit (1 byte) parallel data.
[0035]
The A / D converter 41 is connected to a FIFO memory 42b, and the FIFO memory 42b is connected so that writing is controlled by a writing control unit 42a and reading control is performed by a reading control unit 42c. The conversion unit 43 is provided.
[0036]
The parallel / serial conversion unit 43 is connected to an attenuator 45 via an OR gate 44 as a synthesis unit, and the attenuator 45 is connected to an analog switch 46.
[0037]
On the other hand, the TV camera 2 is connected via an amplifier 47 to a synchronization detection unit 48a constituting a synchronization control unit. The synchronization detection unit 48a detects a horizontal synchronization signal and a vertical synchronization signal, and also forms a synchronization control unit. To the timing control unit 48b.
[0038]
The timing control unit 48b generates a sensor selection signal, a write pulse, a read pulse, and a pilot signal based on the horizontal synchronization signal, and generates a camera / sensor selection signal based on the horizontal synchronization signal and the vertical synchronization signal.
[0039]
The sensor selection signal is a 3-bit parallel signal, which is supplied to the A / D converter 41, the write pulse is supplied to the write control unit 42a, and the read pulse is supplied to the read control unit 42c and the parallel / serial conversion unit 43. Can be The pilot signal is applied to an OR gate 44, and the camera / sensor selection signal is applied to an analog switch 46. The video output signal of the analog switch 46 is provided to a VTR 6 as a recording medium.
[0040]
Further, the vertical synchronization signal detected by the synchronization detector 48a is supplied to the write controller 42a and the read controller 42c to reset the FIFO memory 42b for each field (see FIG. 3 (6)).
[0041]
Note that the sensor selection signal may be provided not from the timing control unit 48b but from the write control unit 42a that receives a write pulse, and the signal that controls the conversion instruction in the parallel / serial conversion unit 43 may be read out. A conversion command signal having a pulse width different from that of the pulse may be used.
[0042]
The operation of the encoder unit 4 will be described below with reference to the time charts shown in FIGS. 3 and 4, taking the case of the left side of the video writing area sampled with 8 channels and 8 bits for each sensor as an example.
[0043]
First, when the video signal (FIG. 3A) from the TV camera 2 is sent to the synchronization detection unit 48a via the amplifier 47, the horizontal synchronization signal (period 1H = 63.5 μs) in this video signal is detected. In response to the detection result, the timing controller 48b synchronizes with the horizontal synchronizing signal and shifts each other by, for example, 2 .mu.s so that output signals from the sensors 1-1 to 1-8 can be sequentially sampled within one cycle H. A 3-bit parallel clock ((4) in the figure) as a sensor selection signal is output and given to the A / D converter 41.
[0044]
Each output signal of the sensors 1-1 to 1-8 supplied to the A / D converter 41 is an analog waveform signal as shown in FIG. 3C, and is sampled by a sensor selection signal from the timing control unit 48b. As a result, the output data (parallel 8 bits) shown in FIG. 5 (5) is supplied to the FIFO memory 42b. Note that in FIG. 5 (5), parallel 8-bit A / D-converted sensor data is output for eight sensors within one cycle H of the horizontal synchronization signal, and output data of the eighth sensor 1-8 is output. This indicates that the state is maintained for the extra time within one cycle H.
[0045]
The sensor data output from the A / D converter 41 is written in the FIFO memory 42b under the control of the write control unit 42a which receives the write pulse ((7) in FIG. 7) from the timing control unit 48b. This write pulse is composed of eight pulses in one cycle H as shown in the figure, similarly to the sensor selection signal.
[0046]
The reading of data from the FIFO memory 42b is performed by the read pulse shown in FIG. This read pulse is obtained by adding one extra pulse to the write pulse in one cycle H, and as shown in FIG. 9 (9), eight sensor data corresponding to the first horizontal scanning line In addition, the first one of the eight sensor data on the next second line is also read.
[0047]
This is because, for example, the horizontal left side is crushed and used in the video display period shown in FIG. 7A so as not to hinder the display, and the FIFO memory 42b is used to adjust the timing of the sensor signal asynchronous with the video signal. It is used for
[0048]
In this example of the timing chart, the case where the horizontal left side is crushed is shown, but the horizontal right side or the left and right equal distribution may be performed. It is also possible to distribute the upper and lower sides in the vertical direction, or evenly distribute the upper and lower sides.
[0049]
Considering the sensor signal writing area shown in FIG. 1A, the storage capacity is determined in unit time, that is, the amount of data per frame is determined by the data sampling cycle, the number of channels, and the data length. For example, assuming that each of the eight sensors has 8 bits, the data amount to be written is 8 × 8 × 525 = 33,600 bits since one frame = 525 lines according to the standard of the video signal.
[0050]
On the other hand, the number of effective scanning lines of the video signal (that is, the area where the video exists) is 480 as shown in FIG. 1A, so the number of data to be written in one scanning line is 33,600 ÷ 480 = 70 bits. However, when a multiple of “8” is taken due to the parallel / serial conversion in the parallel / serial conversion unit 43 connected to the FIFO memory 42b, it becomes 72 bits as shown.
[0051]
Since the bandwidth of the video signal is approximately 4 MHz (= 250 ns), if 1 bit = 250 ns, the period occupied by the sensor data is 250 × 72 = 18,000 ns = 18 μs, and the original horizontal video display period About one third of about 52 μs is the sensor data storage area.
[0052]
However, when 8 bits are allocated to the output (1 channel) of each sensor using 8 sensors as described above, 8 × 8 = 64 bits, and 72−64 = 8 bits (1 byte). Therefore, as shown in FIG. 7 (2), for example, when the channels CH1 to CH8 are set to address 0, it is necessary to write the address 1 of the channel CH1 for another byte in the horizontal direction of the sensor signal writing area. Therefore, as shown in FIG. 4 (9), the data read from the FIFO memory 42b includes 9 bytes of data from the address 0 of the channel CH1 to the address of the channel CH8 and the address of the channel CH1. Are read out in units of 8 bits ((10) in the figure) in accordance with, and are supplied to the parallel / serial conversion unit 43.
[0053]
The parallel / serial converter 43 converts the parallel data from the FIFO memory 42b into a 1-bit serial data (FIG. 12 (12)) according to a read pulse or a serial conversion command signal (FIG. 11 (11)) separately generated from the timing controller 48b. ) Is output to the OR gate 44.
[0054]
On the other hand, a pilot signal is applied from the timing control unit 48b to the OR gate 44 when the synchronization detection unit 48a detects the horizontal synchronization signal, as shown in FIG. After the horizontal synchronizing signal is detected from 44, the pilot signal is first supplied to the attenuator 45, and the serial data from the parallel / serial converter 43 is subsequently supplied to the attenuator 45.
[0055]
The attenuator 45 converts the 1-bit data from the conversion unit 43 into data corresponding to the black and white level in the video signal, and provides the data to the analog switch 46.
[0056]
The analog switch 46 receives a video signal from the TV camera 2 via the amplifier 47. The analog switch 46 receives a camera / video selection signal ((14) in FIG. 14) from the timing controller 48b. The output signal of the attenuator 45 is selected only during the period in which the sensor data is written in the sensor signal writing area shown in FIG. 7A, and the video signal from the amplifier 47 is output and provided to the VTR 6 in other cases. I have.
[0057]
Therefore, the selection signal is such that after 525-480 = 45 horizontal scanning lines have passed, the video signal is crushed only for the horizontal period corresponding to 72 bits and the sensor data from the attenuator 45 is sent to the VTR 6. ing.
[0058]
Thus, in the VTR 6, the video information and the vehicle information as shown in FIG. 3 (6) are recorded as a synchronized mixed video signal (FIG. 4 (15)).
[0059]
In the above-mentioned parallel / serial conversion unit 43, when recording / reproducing with the VTR 6, there is a possibility that the accuracy may be reduced. Therefore, the sensor data stored in the FIFO memory 42b is converted from parallel data to serial data and converted into 1 data. After the bit data, the digital output level (plus 5 volts) is reduced by the attenuator 45 to the video output level (0.7 V). _PP ). By doing so, even if there is some level fluctuation, it is possible to record on the VTR 6 without lowering the accuracy.
[0060]
The purpose of inserting the pilot signal is to distinguish between the video signal and the stored data, and an appropriate “1” or “0” pattern (for example, 8 bits) is added to indicate the head of the area. Thus, the operation can be stably performed even if there is a fluctuation in synchronization.
[0061]
FIG. 6 shows an embodiment of the decoder unit 5 in the on-vehicle data recorder according to the present invention. In this embodiment, the VTR 6 is connected to an amplifier 51, and the amplifier 51 includes a comparator 52 and a pilot detection unit 53 (comparator). 52 and an extraction means), a serial / parallel conversion unit 54, a FIFO memory 55b and a D / A converter 56 which form a memory unit are connected in series in this order. The FIFO memory 55b receives write control from a write control unit 55a also constituting a memory unit, and receives read control from a read control unit 55c.
[0062]
The amplifier 51 is connected to a synchronization detection unit 57a forming a synchronization control unit. The synchronization detection unit 57a is connected to a timing control unit 57b also forming a synchronization control unit, and supplies a horizontal synchronization signal and a vertical synchronization signal. ing.
[0063]
The timing control unit 57b generates the sensor selection signal, the write pulse, and the read pulse within one cycle H of the horizontal synchronization signal based on the horizontal synchronization signal and the vertical synchronization signal, similarly to the timing control unit 48b of the encoder unit 4. .
[0064]
Among them, the write pulse and the read pulse are supplied to a write control unit 55a in the memory unit, the read pulse is also supplied to a serial / parallel conversion unit 54, and the sensor selection signal is supplied to a D / A converter 56.
[0065]
The vertical synchronization signal detected by the synchronization detecting section 57a is supplied to the write control section 55a and the read control section 55c to reset the FIFO memory 55a for each field (see FIG. 7 (7)).
[0066]
Further, the output signal of the amplifier 51 is provided to the TV monitor 7 as a video output, and is output in synchronization with the reproduction signal from the D / A converter 56.
[0067]
The operation of the embodiment of such a decoder section will be described below with reference to the time charts shown in FIGS.
[0068]
FIG. 7A shows a mixed video signal encoded by the encoder unit 4 shown in FIG. 2 and stored in the VTR 6. The signal is separated into “0” ((2) in the figure) and supplied to the pilot detecting unit 53.
[0069]
The pilot detection section 53 detects the head position of the sensor data by detecting the pattern of the pilot signal (a pattern having an extremely low existence probability) indicated by hatching in FIG. 1A, and thereafter, is sent from the comparator 52. The data is sent to the serial / parallel converter 54 as the sensor data to be obtained ((3) and (4) in the figure).
[0070]
The serial / parallel converter 54 outputs the data as parallel data shown in FIG. 6 (6) based on the conversion command signal or the read pulse (FIG. 5 (5)).
[0071]
This parallel data is 8-bit parallel data for each sensor data, and is 9-byte data corresponding to the data in FIG. 4 (9). Therefore, the parallel data is sent to the FIFO memory 55b which has been reset by the vertical synchronization signal. The write controller 55a writes 9 bytes of sensor data by a write pulse ((8) in the figure) in which nine pulses are generated in one cycle H, and eight write pulses are generated in one cycle H Are read out from the readout pulse ((9) in the same figure).
[0072]
The reason why the read pulse is delayed by one clock from the write pulse is to expect a delay in serial / parallel conversion, and to eliminate a shift in display data when recording / reproducing is repeated. .
[0073]
As shown in FIG. 8 (10), sensor data is output from the FIFO memory 55b for each channel signal corresponding to each sensor, and the D / A converter 56 outputs a sensor selection signal (FIG. 11). (3 bits) is converted to an analog signal shown in FIG. 16 (16) as a channel address, and sent to various recording devices or analysis devices 8 as an eight-channel reproduced signal.
[0074]
If a D / A converter 56 with a latch, which is often used when connecting to a microprocessor, is used, a channel signal (3 bits) and a latch signal ((12) in FIG. An analog sensor signal can be obtained after data separated for each sensor ((13) in the figure).
[0075]
FIG. 9 shows an embodiment in which the in-vehicle data recorder according to the present invention is applied as a drive recorder. This drive recorder is a device corresponding to a flight recorder used for investigating the cause of an aircraft accident, and the like. The purpose of this study is to investigate the causes of car traffic accidents and to collect and analyze information necessary for occupant countermeasures.
[0076]
Such a drive recorder uses a brake pedal sensor 1-1 and a vehicle speed sensor 1-2 as sensors, and originally starts running after starting the engine when the vehicle is running (recording) as shown in FIG. Starts the encoder unit 4 of the data recorder 3, and stops recording when the engine is stopped.
[0077]
The data to be recorded are a vehicle speed, a brake, a turn signal, a vehicle acceleration, and the like. The recorded data is connected to a decoder 5 in the data recorder 3 by a data processing analyzer 8 provided outside the vehicle as shown in FIG. By doing so, it becomes possible to analyze the running state immediately before the accident and the state at the time of the accident in parallel with the TV monitor 7.
[0078]
However, in order to find out the true cause of the accident, information from the vehicle-side sensor alone is not sufficient, and the state of the driver and the state of the external infrastructure are also necessary depending on the driving manner.
[0079]
For example, it is necessary to provide information about the driver, such as whether the traffic light was red or yellow, or whether the driver was depressed and the brakes were applied slowly. For this reason, the TV camera 2 was used to determine the road conditions in front and the driver. As described above, the sensor data and the video signal are recorded in the VTR 6 in synchronization with each other, and the recorded video signal and data are displayed on the data processing / analysis device 8 via the data recorder 3. And at the same time, display on the TV monitor 7.
[0080]
FIG. 12 shows an embodiment in which the in-vehicle data recorder according to the present invention is used for a collision warning device. This is a device that compares the determined safe inter-vehicle distances and issues an alarm according to the possibility of a rear-end collision.
[0081]
Accuracy rate / false alarms are often used to evaluate the effectiveness of the device, but this indicator is based on the shape of the road, such as a straight or curved road, and the surrounding environment, such as whether the preceding vehicle is traveling in its own lane or adjacent lane. Depends on
[0082]
In order to solve such a problem, the situation in front is recorded by the TV camera 2 at the same time as the following distance, a vehicle speed signal, and an alarm output, and is effectively used for data processing and analysis.
[0083]
That is, in addition to the sensors as described above, a rear-end collision warning radar 10 is provided in front of the vehicle, and the inter-vehicle distance data from the rear-end collision warning radar 10 is taken into the encoder unit 4 when the actual vehicle shown in FIG. This is recorded as sensor data in the VTR 6 together with the vehicle speed signal and the brake signal.
[0084]
FIG. 14 shows an example of an image of the TV camera 2 shown in FIG.
[0085]
【The invention's effect】
As described above, according to the in-vehicle data recorder according to the present invention, the video signal can be recorded / reproduced synchronously with the one-dimensional time-series data, which is effective for data analysis.
[0086]
In addition, since the VTR is used as a recording / reproducing device, long-term recording can be performed at low cost. Further, although a part of the video signal is masked as a data storage area, only a small area is required, so that data analysis can be performed without any particular problem.
[0087]
Further, the present invention can be applied not only as an in-vehicle drive recorder for tracing an accident but also as a data collection / analysis device effective to collect various data together with video.
[Brief description of the drawings]
FIG. 1 is a block diagram conceptually showing the configuration of a vehicle-mounted data recorder according to the present invention.
FIG. 2 is a block diagram showing an embodiment of an encoder unit used in the vehicle-mounted data recorder according to the present invention.
FIG. 3 is an operation time chart (part 1) of an encoder unit used in the present invention.
FIG. 4 is an operation time chart (part 2) of the encoder unit used in the present invention.
FIG. 5 is a diagram for describing a writing area of a video signal and a sensor signal in the present invention.
FIG. 6 is a block diagram showing an embodiment of a decoder unit in the vehicle-mounted data recorder according to the present invention.
FIG. 7 is an operation time chart (part 1) of a decoder section in the present invention.
FIG. 8 is an operation time chart (2) of the decoder section in the present invention.
FIG. 9 is a schematic diagram when the in-vehicle data recorder according to the present invention is applied to a drive recorder.
FIG. 10 is a diagram showing a recording state when the drive recorder is driven by a real vehicle.
FIG. 11 is a diagram when a video signal and data recorded in a drive recorder are subjected to data processing or data analysis.
FIG. 12 is a schematic diagram showing an embodiment when the in-vehicle data recorder according to the present invention is applied to a rear-end collision warning device.
FIG. 13 is a diagram showing a vehicle-mounted data recorder applied to a rear-end collision warning device when the vehicle is running (at the time of recording).
FIG. 14 is a diagram showing an example of an image when looking ahead from inside the vehicle.
FIG. 15 is a block diagram showing a conventional in-vehicle data recorder (1).
FIG. 16 is a block diagram showing a conventional in-vehicle data recorder (2).
[Explanation of symbols]
1,1-1 to 1-n sensor
2 TV camera
3 Data recorder
4 Encoder section
5 Decoder section
6 VTR
7 TV monitor
8 Various storage devices / analyzers
41 Multiplex A / D Converter
42a Write control unit
42b FIFO memory
42c read control unit
43 Parallel / Serial Converter
44 OR gate (synthesis unit)
45 attenuator
46 Analog switch
48a synchronization detector
48b Timing control unit
52 Comparator
53 Pilot detector
54 Serial / Parallel Converter
55a Write control unit
55b FIFO memory
55c read control unit
56 D / A converter
57a synchronization detector
57b Timing control unit
In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (3)

A TV camera mounted on the vehicle,
At least one sensor for detecting vehicle information;
The horizontal synchronizing signal and the vertical synchronizing signal of the TV camera are detected, and are assigned in one cycle of the horizontal synchronizing signal according to the selection signal of the sensor, the writing pulses for the number of the sensors, and the writing position in the video area in advance. A synchronization control unit for generating a read pulse in which the number of read pulses per frame is equal to the number of write pulses, a pilot signal after detection of the horizontal synchronization signal, and a camera / sensor selection signal, and an output signal of the sensor based on the sensor selection signal A / D conversion means for sequentially sampling in the one cycle and outputting as parallel data, a memory section for storing the parallel data in accordance with the write pulse and reading in accordance with the read pulse, and a parallel section from the memory section in accordance with the read pulse Parallel / serial conversion means for converting data into serial data, for synthesizing the pilot signal with the subsequent serial data A synthesizing unit, attenuating means for converting the pilot signal and the serial data into sensor data corresponding to a black and white level of the video signal of the TV camera, and sensor data of the attenuating means converting the sensor data of the video signal by the camera / sensor selection signal. An encoder configured by an analog switch that switches between the sensor data and the video signal so as to be displayed in a predetermined area and records the mixed data as a mixed video signal on a recording medium;
An in-vehicle data recorder comprising: 2. The apparatus according to claim 1, further comprising detecting the horizontal synchronization signal and the vertical synchronization signal from the mixed video signal recorded on the recording medium, and detecting the horizontal synchronization signal and the vertical synchronization signal within one cycle of the horizontal synchronization signal. A synchronization control unit for generating a write pulse in which the number of read pulses equal to the number of the sensors and the number of write pulses per frame previously assigned according to the write position in the video area are equal to the number of read pulses; Means for detecting a pilot signal to extract the subsequent sensor data, serial / parallel conversion means for converting the sensor data into the parallel data by the read pulse, and storing and reading the parallel data according to the write pulse. A memory unit that reads in accordance with a pulse, and a D / A converter that converts parallel data in the memory unit into a corresponding analog reproduction signal in accordance with the sensor selection signal. Vehicle data recorder is configured, it characterized by comprising a decoder which gives a mixed video signal recorded on the recording medium to the TV monitor in the. 3. The in-vehicle data recorder according to claim 1, wherein the memory unit performs reset based on the vertical synchronization signal.

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