JPH0833085A - On-vehicle sound device - Google Patents

Abstract

PURPOSE:To generate a stereoscopic sound field by a sound source outside a compartment within the compartment and to easily decide the location of an emergency vehicle, etc., by driving the loud speaker corresponding to each part within the compartment by the signals from plural microphones arranged at different places outside the vehicle. CONSTITUTION:The signals from microphones 1a to 1d are amplified by the corresponding microphone amplifiers 3a to 3d, respectively, and the bands of the signals are limited by band pass filters 6a to 6d. A variable ratio is added to the signals of the microphone 1a and the microphone 1d for which the band pass limitations are performed by a mixer 5, the signals pass a mute circuit 7a, the signals are amplified in a power amplifier 4d and they drive a loud speaker 2d. Also as for the opposite signals of the microphones 1a-1b; the microphone 1b--1c; the microphones 1c-1d, the variable ratio is added to them by the mixer and they drive each of loud speakers 2a, 2b and 2c, in the same way. As a result, the sense of direction of sound due to the hearing sense according to a hearing location can be set to its optimum state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted acoustic device equipped with a microphone, and more particularly to a vehicle-mounted acoustic device that produces an environmental sound outside the vehicle compartment with the window closed.

[0002]

2. Description of the Related Art Conventionally, there has been a vehicle-mounted acoustic device for driving a loudspeaker arranged in a vehicle compartment by a signal from a microphone arranged outside the vehicle for recognizing an emergency vehicle or the like. Further, in the automobile with a hearing device proposed in Japanese Utility Model Laid-Open No. 60-81145, a plurality of microphones are arranged outside the passenger compartment.
Signals from these microphones drive a plurality of speakers arranged inside the vehicle. One amplifier for amplifying a microphone signal is provided, and a plurality of speakers are driven by a common output signal from the amplifier. Further, the front microphone and the rear microphone are selected by the changeover switch as the microphone for inputting a signal to the amplifier.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention Shoukai 60-8114
According to the vehicle with a hearing device proposed in Japanese Patent Publication No. 5, the sound outside the vehicle can be heard well inside the vehicle, but since a plurality of speakers are driven by a common output signal, the sense of direction of the sound cannot be obtained, and the sound source There was a drawback in that it was not possible to determine the direction in which the direction was by using only the sound.

Further, although the interior of the vehicle is in a sealed state, a feeling of oppression is felt, but there is a drawback that such oppressive feeling cannot be alleviated by a sound that does not include a sense of direction.

The present invention has been made in view of the above points, and an object of the present invention is to reproduce a sound outside the vehicle in the vehicle including a sense of direction so that an emergency vehicle or the like can be removed from the closed vehicle. An object of the present invention is to provide an in-vehicle audio device that can determine the position of a vehicle by only sound.

Another object of the present invention is to provide a vehicle-mounted acoustic device that can relieve the feeling of pressure in a closed vehicle compartment.

[0007]

According to the on-vehicle audio system of the present invention, a plurality of microphones are arranged at different locations outside the vehicle, a plurality of loudspeakers are arranged at different locations inside the vehicle, and each of the loudspeakers is provided. The microphones are made to correspond to each other, and each loudspeaker is driven by an output signal thereof.

In the on-vehicle audio system, a loudspeaker arranged on the left side in the front of the vehicle compartment is used as a signal from a microphone arranged outside the vehicle in front of the vehicle in the vehicle width direction and outside of the vehicle in the vehicle left direction in the vehicle width direction. 0.25: 0.75 to 0.75: 0.2
Driven by a signal added at a rate of 5, a loudspeaker placed on the front right side of the vehicle compartment is output from a microphone placed outside the vehicle in the center of the vehicle width direction and to the outside of the vehicle on the right side in the vehicle width direction. It drives with the signal which added the signal from the arranged microphone at the ratio of 0.25: 0.75 to 0.75: 0.25, and the loudspeaker arranged on the left side in the rear of the passenger compartment is in the center of the vehicle width direction. 0.25: 0.7 between the signal from the microphone placed outside the vehicle and the signal from the microphone placed outside the vehicle at the center in the vehicle width direction leftward traveling direction.
Driven by the signal added at the ratio of 5 to 0.75: 0.25,
A signal from a microphone arranged on the outside of the vehicle behind the loudspeaker arranged on the rear right side of the passenger compartment in the vehicle width direction and a signal from a microphone arranged on the outside of the vehicle in the center of the vehicle width direction right direction in the traveling direction is 0.25. : 0.75 to 0.75:
It is configured to be driven by a signal added at a rate of 0.25.

Further, in each of the vehicle-mounted acoustic devices, signals from respective microphones have a pass band of 200H.
It is band-limited by a band-pass filter having a frequency of z to 4 kHz.

Further, in each of the vehicle-mounted acoustic devices, each microphone has unidirectionality.

Furthermore, in each of the vehicle-mounted acoustic devices,
A mute circuit that attenuates the signal from the microphone is provided, and the mute circuit is activated either manually or by the signal from the operation detection circuit that detects the signal of the horn switch, and the sound of the loudspeaker is automatically stopped when the vehicle horn is operating. It is configured to do.

Further, in the on-vehicle audio system, the mute circuit is deactivated when the operation detection circuit detects the signals of the steering angle sensor and the backward lamp switch.

[0013]

According to the on-vehicle audio system of the present invention, the signals from the plurality of microphones arranged at different locations outside the vehicle drive the corresponding loudspeakers in the vehicle interior, so that the sound source outside the vehicle interior is generated. Generate a three-dimensional sound field,
The sound can be used to determine the position of an emergency vehicle or the like. In addition, the three-dimensional sound field from the sound source outside the passenger compartment eases the feeling of pressure in the closed passenger compartment.

According to a second aspect of the present invention, a loudspeaker arranged in the middle direction of a pair of microphones arranged outside the vehicle is used to output a signal from these microphones to 0.2.
When driving with a signal added at a ratio of 5: 0.75 to 0.75: 0.25, the sense of direction of the sound by the sense of hearing is optimized by changing the mixing ratio according to the listening position. be able to.

Further, the signals from the respective microphones are band-limited by a band-pass filter having a pass band of 200 Hz to 4 kHz, so that the running sound of a car struck by low frequencies and the wind noise of a mancrophone are cut off. can do.

Further, since the unidirectional microphone has a sharp directivity in the front direction and cuts the signal from the rear direction, it is possible to effectively generate the sense of direction of the sound according to the signal.

If a mute circuit for attenuating the signal from the microphone is provided and the mute circuit is operated by the signal of the horn switch, it is possible to prevent the loud noise of the horn from causing discomfort. Further, by manually operating the mute circuit, the audio device can be turned on and off arbitrarily.

When the mute circuit is operated by the horn as described above, if the mute circuit is deactivated by the signals of the rudder angle sensor and the backward lamp switch, the audio device is automatically activated at the time of left turn, right turn and backward movement. The operating state is saved, and the trouble of turning the audio device on and off is saved.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An on-vehicle audio system according to an embodiment of the present invention will be described with reference to the drawings. 1 is a plan view showing an arrangement of a loudspeaker and a microphone of an on-vehicle acoustic device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a configuration of the on-vehicle acoustic device.

In the figure, 1a to 1d are unidirectional microphones, and the microphone 1a is mounted outside the vehicle at the center in the vehicle width direction and on the front side in the traveling direction. Further, the microphones 1b and 1d are mounted outside the vehicle on the left side and the right side in the vehicle width direction, respectively, in the center of the traveling direction, and the microphone 1c is attached to the vehicle outside of the center in the vehicle width direction and the rear side in the traveling direction.

Loudspeakers 2a to 2d are mounted on the left front door and the right front door, respectively, and loudspeakers 2b and 2c are mounted on the left and right sides of the rear parcel, respectively.

As shown in FIG. 2, microphones 1a to 1
The signals from d are microphone amplifiers 3a to 3d, respectively.
And the band of the signal is limited by the band pass filters 6a to 6d. The band-pass filters 6a to 6d can arbitrarily set the cutoff frequency in the range of 200 Hz to 4 KHz.

The signals of the microphones 1a and 1d thus amplified and band-limited are added by the mixer 5 at a variable ratio of 0.25: 0.75 to 0.75: 0.25, and further muted circuit 7a. And is amplified by the power amplifier 4d to drive the loudspeaker 2d.

Similarly, the amplified and band-limited signals of the microphone 1a and the microphone 1b are added by the mixer 5 at a variable ratio of 0.25: 0.75 to 0.75: 0.25, and further the mute circuit 7b. And is amplified by the power amplifier 4a to drive the loudspeaker 2a.

Similarly, the amplified and band-limited signals of the microphone 1b and the microphone 1c are added by the mixer 5 at a variable ratio of 0.25: 0.75 to 0.75: 0.25, and the mute circuit 7c is further added. And is amplified by the power amplifier 4b to drive the loudspeaker 2b.

Similarly, the amplified and band-limited signals of the microphone 1c and the microphone 1d are added by the mixer 5 at a variable ratio of 0.25: 0.75 to 0.75: 0.25, and the mute circuit 7d is further added. And is amplified by the power amplifier 4c to drive the loudspeaker 2c.

As described above, the loudspeaker arranged in the middle direction of the pair of microphones arranged outside the vehicle cabin outputs signals from these microphones by 0.25: 0.75-0.7.
Since it is driven by a signal added at a variable ratio of 5: 0.25, it is possible to set the direction sense of the sound by the sense of hearing to an optimum state according to the listening position.

The mute circuits 7a to 7d are operation detection circuits 8
Controlled by. That is, the operation detection circuit 8 switches the mute circuits 7a to 7d between the operating state and the non-operating state.
Signals from a horn switch, a rudder angle sensor and a backward lamp switch are input to the motion detection circuit 8, and when the horn sounds or a manual switch is operated, the motion detection circuit 8
Causes the mute circuits 7a to 7d to operate, and then when the vehicle makes a right turn, a left turn, or moves backward, the motion detection circuit 8 deactivates the mute circuits 7a to 7d so that the audio device operates.

The embodiment is configured as described above, but the invention is not limited to this. For example, three or four are provided outside the passenger compartment.
It is also possible to arrange individual microphones and drive the loudspeakers in the vehicle compartment arranged in the same direction as the microphones by the signals of the respective microphones.

[0030]

According to the on-vehicle audio system of the present invention, signals from a plurality of microphones arranged at different locations outside the vehicle drive the corresponding loudspeakers in the vehicle interior. The sound source can generate a three-dimensional sound field, and the sound can determine the position of the emergency vehicle or the like. In addition, the three-dimensional sound field from the sound source outside the passenger compartment eases the feeling of pressure in the closed passenger compartment.

[Brief description of drawings]

FIG. 1 is a plan view showing an arrangement of a loudspeaker and a microphone of a vehicle-mounted acoustic device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of the vehicle-mounted acoustic device.

[Explanation of symbols]

 1a to 1d Microphone 2a to 2d Loudspeaker 3a to 3d Microphone amplifier 4a to 4d Power amplifier 5 Mixer 6a to 6d Band pass filter 7a to 7d Mute circuit 8 Operation detection circuit

Claims (6)

[Claims] 1. A plurality of microphones are arranged at different places outside a vehicle, a plurality of loudspeakers are arranged at different places inside a vehicle compartment, and the respective loudspeakers are made to correspond to the respective microphones, and respective loudspeakers are output by their output signals. An in-vehicle acoustic device configured to drive a device. 2. A signal from a microphone disposed outside the vehicle in front of the vehicle in the vehicle width direction central traveling direction and a signal from a microphone disposed outside the vehicle in the vehicle width direction left traveling direction in the vehicle width direction central traveling direction. And 0.25: 0.75
Driven by a signal added at a ratio of ~ 0.75: 0.25, a loudspeaker placed on the right side in the front of the passenger compartment is a signal from a microphone placed outside the vehicle on the front side in the center of the vehicle width direction and the right side in the vehicle width direction. A signal from a microphone arranged outside the vehicle at the center of the traveling direction is set to 0.25: 0.75 to 0.75: 0.
Driven by a signal added at a rate of 25, a loudspeaker placed on the left side in the rear of the passenger compartment is output to the outside of the vehicle behind the vehicle in the center of the vehicle width direction and to the outside of the vehicle on the left side in the vehicle width direction. It drives with the signal which added the signal from the arranged microphone in the ratio of 0.25: 0.75 to 0.75: 0.25, and the loudspeaker arranged on the right side in the rear of the passenger compartment is in the center of the vehicle width direction 0.25: 0.7 between the signal from the microphone placed outside the vehicle and the signal from the microphone placed outside the vehicle in the center in the right direction in the vehicle width direction.
The vehicle-mounted audio device according to claim 1, wherein the vehicle-mounted audio device is configured to be driven by a signal applied at a ratio of 5 to 0.75: 0.25. 3. The vehicle-mounted acoustic device according to claim 1, wherein the signals from the respective microphones are band-limited by a band-pass filter having a pass band of 200 Hz to 4 kHz. 4. The vehicle-mounted acoustic device according to claim 1, wherein each microphone has unidirectionality. 5. A mute circuit for attenuating a signal from the microphone is provided, and the mute circuit is operated either manually or by a signal from an operation detection circuit that detects a signal from a horn switch, and the loud sound is automatically generated when the vehicle horn is operated. The vehicle-mounted acoustic device according to any one of claims 1 to 4, which is configured to stop sounding of the instrument. 6. The on-vehicle audio system according to claim 5, wherein when the operation detection circuit detects signals of a steering angle sensor and a backward lamp switch, the mute circuit is made inactive.