JPH07149186A - Sound listening device for vehicle - Google Patents

Abstract

PURPOSE:To obtain information concerning running sound of an objective vehicle without being influenced by the noise generated by surrounding environment. CONSTITUTION:This sound listening device for vehicle is provided with microphones 1,2 respectively arranged on the right and left of the front end part of a vehicle body 19 and collecting sound outside the vehicle, a signal processing part 3 having a filter passing a prescribed frequency band of the signals from these microphones 1, 2, and speakers 4, 5 regenerating the output signal from the signal processing part 3 to a sound, and the sound only in the frequency band territory observed specifically in a vehicle running sound is obtained in a vehicle room through the filter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle sound listening device capable of listening to sounds outside the vehicle inside the vehicle.

[0002]

2. Description of the Related Art As a conventional technique, a full-fledged 58-190
The technique disclosed in Japanese Patent No. 233 is known. Since this technology has a high degree of airtightness inside and outside the vehicle, it is difficult to hear noise outside the vehicle.In particular, when wind, rain, or a cooler is operating, the windows of the vehicle are closed. And
A vehicle with better soundproofing is made in view of the problem that the sound outside the vehicle is blocked and it is hard for the driver in the vehicle to hear, and it is not preferable in terms of safety when going out of the side street with poor visibility into the main street. A pair of sound collecting microphones are arranged on the left and right of the front or rear of the outside of the vehicle, and the sound input from this microphone can be heard by a pair of speakers mounted on the left and right of the inside of the vehicle. It is intended to improve the safety of the car in such cases.

[0003]

However, in the above-mentioned prior art, the sound of the approaching vehicle is masked at a place where the level of sound other than the vehicle is large, such as around the track or the construction site, and the existence of the sound exists. There was a problem that I could not grasp.

[0004]

In order to solve the above-mentioned problems, a vehicle sound-receiving device of the present invention is provided outside the vehicle and collects sound outside the vehicle. A filter for passing a predetermined frequency band of the signal, an amplifying means for amplifying the signal passed through the filter, and an output means arranged inside the vehicle for generating a sound by applying a signal from the amplifying means. , Are provided.

[0005]

According to the present invention, the sound collected by the sound collecting means arranged outside the vehicle is passed through a filter for passing a predetermined frequency band, and the signal passing through this filter is amplified and output by the output means. Output sound.

[0006]

According to the present invention, the driver can selectively obtain information on the running sound of the vehicle without being affected by the noise generated by the surrounding environment, etc. It becomes possible to detect, and it has an extremely excellent effect on safety.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a vehicle audio device of the present invention will be described based on an embodiment shown in the drawings. [First Embodiment] FIGS. 1 and 2 show a first embodiment of the present invention. FIG. 1 is a top view showing an arrangement of a vehicle sound-receiving device, and FIG. 2 is a circuit configuration diagram of the vehicle sound-receiving device. Is shown.

In FIG. 1, 19 is a vehicle body, and this vehicle body 19 is an engine room 20 in which an engine and the like are mounted.
And a passenger compartment 21 for passengers and the like, and a trunk room 22 for carrying luggage and the like. The vehicle sound listening device of the present invention includes microphones 1 and 2 which are respectively disposed on the left and right of the front end of the vehicle body 19 and serve as sound collecting means for collecting sounds outside the vehicle.
A signal processing unit 3 that processes the signals from the microphones 1 and 2, speakers 4 and 5 that form an output unit that reproduces the signal from the signal processing unit 3 into sound, and control that controls the power to the signal processing unit 3. And part 23.

The signal processing section 3 includes signal amplifying circuits 6 and 7 for amplifying signals from the microphones 1 and 2, and variable resistors 10 and 11 capable of controlling the magnitude of output signals from the signal amplifying circuits 6 and 7. And filters 8 and 9 that pass only signals in a necessary frequency band among signals that have passed through the variable resistor.
And power amplifier circuits 12 and 13 for amplifying the outputs from the filters 8 and 9 into signals necessary for driving the speakers 4 and 5.

The control unit 23 supplies the DC power to the signal amplifying circuits 6 and 7, the filters 8 and 9, and the power amplifying circuits 12 and 13, and the power supply unit 15 and the switch 16 as described above. Consisting of a connected battery 17,
On / off of the power supply unit 15 can be manually controlled by the switch 16. The knobs 14 of the variable resistors 10 and 11 are arranged in the vehicle compartment so that the driver can change the output from the speakers 4 and 5 as needed.

Next, the operation of the above configuration will be described below. When the driver turns on the switch 16 when entering an intersection with poor visibility, the vehicle body 1
Microphones 1 and 2 respectively arranged in front of 9 collect sounds outside the vehicle, and when the signals from the microphones 1 and 2 are processed by the signal processing unit 3, the frequencies required by the filters 8 and 9 are obtained. Only the band signal is passed, and this signal is output from the speakers 4 and 5 in the vehicle compartment.

Here, the sound in the required frequency band refers to, for example, road noise (40 to 200 Hz) that is constantly generated between the tires of the vehicle and the road surface and is generated when the vehicle is running. Next, the effect of the first embodiment will be described below. According to the first embodiment, the filters 8 and 9 allow only the signals in the required frequency band to pass through, and the speakers 4 and 5 are driven based on these signals, so that the driver is noisy due to the surrounding environment. It is possible to obtain only the information about the running sound of the vehicle without being affected by, for example, the running sound of the target vehicle near the track or the construction site is not masked, and the target vehicle approaching the intersection is surely secured. It can be detected and has an extremely excellent effect on safety.

The setting of the necessary frequency band in the filters 8 and 9 is not limited to the frequency band relating to road noise, but may be any setting that can be observed peculiar to the vehicle running sound. Further, in the above-mentioned first embodiment, the outside sound of the required frequency band is reproduced by the speaker,
The present invention is not limited to this, and the presence of an approaching vehicle may be displayed and alarmed in the passenger compartment based on the signal passed through the filter.

Further, in the first embodiment, the microphones 1 and 2 are arranged on the left and right sides of the front end portion of the vehicle body 19, but it goes without saying that the microphones 1 and 2 are also useful on the left and right sides of the rear end portion of the vehicle body 19. [Second Embodiment] Next, a second embodiment of the present invention will be described. In the above-described first embodiment, the case where the switch of the hearing device is manually turned on when entering an intersection with poor visibility has been described, but in the second embodiment, the vehicle speed signal and the throttle opening signal are described. The switch of the hearing device is automatically turned on based on the brake signal.

That is, when the left and right safety can not be visually confirmed when a vehicle enters an intersection with poor visibility, it is peculiar to stop or drive slowly, intermittently operate the brake, use a throttle at a minute angle, etc. The focus is on the generation of signal forms. 3 to 4 relate to a second embodiment of the present invention. FIG. 3 is a circuit configuration diagram of a control unit of a vehicle audio device, and FIG. 4 is a flow chart showing a determination process of the control unit. is there.

The control unit 23, which is a characteristic part of the second embodiment.
Is a power supply unit 15 for supplying DC power to the signal amplification circuits 6 and 7, the filters 8 and 9 and the power amplification circuits 12 and 13 which form the signal processing unit 3 described above, and the power supply unit 15 and the manual switch 16 The connected battery 17, the vehicle speed signal,
Slot opening signal and brake signal are input respectively,
The ECU 18 determines whether to operate the power supply unit 15 based on the input signal. The power source unit 15 can be turned on and off by both the manual switch 16 and the output signal of the ECU 18.

The signal processing section 3 is the same as in the first embodiment described above. Next, referring to FIG. 2, the ECU
An example of the determination process in 18 will be described below. First, in step 30, it is determined whether the vehicle speed is 10 km / h or less based on the vehicle speed signal input to the ECU 18. If the vehicle speed is 10 km / h or less in step 30, the process proceeds to step 40. If the vehicle speed is higher than 10 km / h, the power supply unit 15 is turned off in step 35 to end the process.

Next, when the vehicle speed is 10 km / h or less, it is determined in step 40 whether the throttle opening is 10 degrees or less based on the throttle opening signal input to the ECU 18. If the throttle opening is 10 degrees or less, the process proceeds to step 50, and in step 50, the power supply unit 15 is turned on and the process ends.

On the other hand, if the throttle opening is larger than 10 degrees in step 40, it is judged in step 45 whether the brake is used intermittently, and the brake is used intermittently. In this case, in step 50, the power supply unit 15 is turned on to end the process. If the brake is not used intermittently, the power supply unit 15 is turned off in step 35 to end the process.

Next, the operation of the above configuration will be described below. The ECU 18 automatically detects an approach to an intersection with poor visibility based on the vehicle speed signal, the throttle opening signal, and the brake signal, and controls the signal processing unit by turning on / off the power supply unit 15 by the signal. As a result, it is automatically determined whether or not to collect the sound outside the vehicle.

Next, the effect of the second embodiment will be described below. According to the second embodiment, since the hearing device is automatically turned on / off based on the vehicle speed signal, the throttle opening signal, and the brake signal, the driver does not need to operate the switch, and the driver can drive safely. It is possible to exert an extremely excellent effect that it can contribute to, and it is possible to prevent forgetting to turn on the switch in advance.

It should be noted that by providing a switch for turning on / off the electric power supplied to the ECU 18 between the battery 17 and the ECU 18, it is possible to set only the manual mode. Further, the signal supplied to the ECU 18 is not limited to the vehicle speed signal, the throttle opening signal, and the brake signal, and for example, a signal from a direction indicator or the like may be input.

[Brief description of drawings]

FIG. 1 is a top view showing the arrangement of a vehicle listening device according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of a vehicle listening device.

FIG. 3 is a circuit configuration diagram of a control unit of a vehicle listening device, showing a second embodiment of the present invention.

FIG. 4 is a flowchart showing a determination process of the control unit.

[Explanation of symbols]

 1, 2 Microphones as sound collecting means 4, 5 Speakers as output means 8, 9 Filters 12, 13 Power amplification circuit as amplification means

Claims (1)

[Claims] 1. A sound collecting unit which is arranged outside the vehicle and collects sound outside the vehicle, a filter which passes a predetermined frequency band of a signal from the sound collecting unit, and an amplifying unit which amplifies the signal passed through the filter. And a sound output device that is disposed inside the vehicle and that generates a sound when a signal from the amplifying device is applied thereto.