JPH0692214B2 - Vehicle rear monitoring system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle rear monitoring system which enables a driver on the vehicle driver's seat side to monitor the rear of the vehicle rear and at the same time to communicate with a worker or the like outside the rear of the vehicle. Is.

[0002]

2. Description of the Related Art Conventionally, a vehicle rear monitoring system as shown in FIG. 3 has been used for a bus or a one-box car in which it is difficult to check the rear safety by using a direct view or a rearview mirror. In FIG. 3, a TV camera 12 is installed on the rear part of the roof of the vehicle 10 with its rear facing, and an image behind the vehicle taken by the TV camera 12 is
It is monitored by the monitor TV 14 provided on the driver's seat side of 0. The driver in the driver's seat can perform a driving operation while confirming the rear safety with the image on the monitor TV 14.

[0003]

By the way, it is difficult to grasp the distance to an obstacle behind the vehicle simply by looking at the rear image on the monitor television 14 as shown in FIG. Therefore, it is desirable to arrange a worker outside the rear part of the vehicle and perform driving operation based on the instruction of the worker.
However, in the conventional vehicle rear monitoring system, there is a problem that it is difficult for the driver to hear the instruction from the worker because the distance between the worker and the driver behind the vehicle is long. Further, there is a problem that it is difficult to reliably transmit the instruction to a worker who is outside the vehicle behind the driver.

The present invention has been made in view of the circumstances of the conventional vehicle rear monitoring system as described above, and it is possible to monitor the rear rear of the vehicle and at the same time make a call easily and reliably between the driver's seat side and the vehicle rear side. It is an object of the present invention to provide a vehicle rearward monitoring system that enables the above.

[0005]

In order to achieve the above object, a vehicle rear monitoring system of the present invention installs a television camera toward the rear on the rear side of the vehicle and a rear microphone and a rear speaker. , A monitor television for monitoring the image of the television camera is installed on the driver's side of the vehicle, a front microphone and a front speaker are installed, and the sound input to the rear microphone is fed to the first main amplifier. The front speaker is used to amplify the sound, and the voice input to the front microphone is amplified to the rear speaker via the second main amplifier.

Then, a first preamplifier for amplifying the input of the front microphone is provided on the vehicle driver's side, and a first preamplifier for extracting only a voice band from the output of the first preamplifier.
A second preamplifier for amplifying the input of the rear microphone on the rear side of the vehicle and a second preamplifier for extracting only the voice band by the output of the second preamplifier. The voice band filter and the second main amplifier may be provided.

The power switch provided on the driver's seat side of the vehicle may be configured to control ON / OFF of the television camera, the monitor television, and the first and second main amplifiers.

[0008]

[Operation] A front microphone and a front speaker are provided on the vehicle driver's side, and a rear microphone and a rear speaker are provided on the vehicle's rear side, so that the driver's seat side and the outside of the vehicle rear are separated from each other. The hand and the worker can surely communicate with each other, and the driver can safely and surely perform the driving operation according to the instruction of the worker while watching the image of the rear of the vehicle displayed on the monitor TV.

If a voice band filter is provided so that only the voice band extracted is amplified by the speaker, unnecessary noise can be eliminated and a clear call can be made.

Further, if the TV system and the audio system are simultaneously ON / OFF controlled by the power switch provided on the driver's seat side of the vehicle, the audio system is always in the operating state when the image is displayed on the monitor TV. You will not be unable to make calls due to forgetting the operation.

[0011]

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a block circuit diagram of an embodiment of a vehicle rear monitoring system of the present invention, and FIG. 2 is a diagram showing an example of installation of the vehicle rear monitoring system of the present invention in a vehicle.

First, the installation of the present invention on the vehicle 10 will be described with reference to FIG. A TV camera 12 is installed in the rear part of the roof of the vehicle 10 with its rear facing.
The image of the rear of the vehicle captured by the monitor TV 14 installed on the instrument panel or the like on the driver side of the vehicle 10.
Monitored by. Further, a front microphone 16 and a front speaker 18 are arranged toward the driver on the driver's seat side of the vehicle 10 and are connected to the front audio unit 20, respectively. Similarly, a rear microphone 22 and a rear speaker 24 are arranged outwardly at the rear of the vehicle 10 and are connected to the rear audio unit 26, respectively. The television camera 12 and the monitor television 14 are connected to each other, and the front and rear audio units 20 and 26 are connected to each other by a cable 28 having a plurality of cores.

Next, the circuit configuration will be described in detail with reference to FIG. The field of view behind the vehicle 10 is the lens 30 and the CCD.
The video signal is converted by the television camera 12 including the device 32, the processor 34, and the encoder 36. Then, this video signal is transmitted through one core of the cable 28, given to the monitor television 14 and monitored. In addition, the voice input to the front microphone 16 is amplified by the first preamplifier 40 in the front voice unit 20, and only the voice band is extracted by the first voice band filter 42, and the extracted signal is a cable. The signal is transmitted through another core 28, is amplified by the second main amplifier 44 of the rear audio unit 26, and is amplified by the rear speaker 24. Similarly, the voice input to the rear microphone 22 is amplified by the second preamplifier 46 in the rear voice unit 26, and only the voice band is extracted by the second voice band filter 48, and the extracted signal is the cable 28.
Is further transmitted through another core of the front audio unit 20, amplified by the first main amplifier 50 of the front audio unit 20, and then amplified by the front speaker 18. Furthermore, the TV camera 12, the monitor TV 14, and the front and rear audio units 20 and 26,
Power is supplied from the battery 52 via a manually operated power switch 54 provided on the driver's side to turn on / off.
Controlled. Instead of the power switch 54, a switch that interlocks with the back gear switch may be used. Further, a switch that operates in conjunction with the back gear switch may be connected in parallel to the power switch 54 that is manually operated.

According to this structure, when the television camera 12 and the monitor television 14 are operated by operating the power switch 54, the vehicle driver's seat side and the vehicle rear side can easily talk. Therefore, the driver can safely and surely perform the backward operation of the vehicle 10 while listening to the instruction of the worker outside the rear part of the vehicle and watching the rear view on the monitor TV 14. Also, the vehicle 1
It is also possible to give an instruction from the driver to a worker outside the rear part of the vehicle prior to the reverse of 0. Here, the speaker 1
From 8 and 24, only the human voice is amplified and the sound outside the voice band is excluded. Therefore, the human voice can be clearly heard even in the noise.

In the above embodiment, the first and second
Although the first and second voice band filters 42 and 48 are arranged on the preamplifiers 40 and 46 side, the present invention is not limited to this, and may be arranged on the first and second main amplifiers 44 and 50 side.

[0016]

As described above, since the vehicle rear monitoring system of the present invention is constructed, the following special effects are exhibited.

According to the first aspect of the present invention, since the vehicle driver's seat side and the vehicle rear side can talk, the driver confirms his / her rear view on the monitor TV and at the same time he / she is behind the vehicle. It is possible to reliably listen to the instructions of the staff member, and the vehicle can be retracted safely and reliably. In addition, the driver in the driver's seat can give an instruction to a worker behind the vehicle while watching the TV monitor, which is extremely useful in practice.

According to the second aspect,
Since only the sound within the voice band is amplified by the speaker, it is possible to relatively clearly hear the voice of a person in the presence of noise, and it is possible to easily talk with each other between the driver side and the rear of the vehicle.

According to the third aspect of the present invention, since it is necessary to see the field of view behind the vehicle, if the TV camera and the monitor TV are set in the operating state, a call can be made between the driver side and the rear of the vehicle at the same time. It will be possible. Therefore, even though a microphone and a speaker are added to this type of conventional system, the complexity of operation does not increase.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of an embodiment of a vehicle rear monitoring system of the present invention.

FIG. 2 is a diagram showing an example of installation of a vehicle rear monitoring system of the present invention in a vehicle.

FIG. 3 is a diagram showing an example of installation of a conventional vehicle rearward monitoring system in a vehicle.

[Explanation of symbols]

 10 Vehicle 12 Television Camera 14 Monitor Television 16 Front Microphone 18 Front Speaker 22 Rear Microphone 24 Rear Speaker 40 First Preamplifier 42 First Voice Band Filter 44 Second Main Amplifier 46 Second Preamplifier 48 Second Audio Bandpass filter 50 First main amplifier 54 Power switch

Claims (3)

[Claims] 1. A TV camera is installed on the rear side of the vehicle toward the rear, a rear microphone and a rear speaker are installed, and a monitor TV for monitoring the image of the TV camera is installed on the driver's side of the vehicle. In addition, a front microphone and a front speaker are installed, the sound input to the rear microphone is amplified by the front speaker via the first main amplifier, and the sound input to the front microphone is expanded. A rear vehicle monitoring system, characterized in that the rear speaker is configured to raise the voice through the second main amplifier. 2. The vehicle rear monitoring system according to claim 1, wherein only a voice band is extracted from a first preamplifier for amplifying an input of the front microphone on a vehicle driver side and an output of the first preamplifier. A first voice band filter and the first main amplifier are provided, a second pre-amplifier for amplifying the input of the rear microphone is provided on the rear side of the vehicle, and only a voice band is extracted from the output of the second pre-amplifier. A vehicle rearward monitoring system comprising a second voice band filter and a second main amplifier. 3. The vehicle rear monitoring system according to claim 1, wherein the power switch provided on the vehicle driver's seat side controls ON / OFF of the television camera, the monitor television, and the first and second main amplifiers. A vehicle rearward monitoring system characterized by being configured.