JP3271858B2 - In-car audio equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle acoustic device having a microphone, and more particularly, to an on-vehicle acoustic device for generating an ambient sound outside the cabin in a cabin when a window is closed.

[0002]

2. Description of the Related Art Conventionally, there has been an on-vehicle acoustic device for driving a loudspeaker disposed in a vehicle cabin by a signal from a microphone disposed outside the vehicle in order to recognize an emergency vehicle or the like. Also, the vehicle with a hearing device proposed in Japanese Utility Model Publication No. 60-81145 has a plurality of microphones arranged outside the cabin,
A plurality of speakers arranged in the vehicle compartment are driven by signals from the microphones. One amplifier for amplifying the signal of the microphone is provided, and a plurality of speakers are driven by a common output signal from the amplifier.

A microphone for inputting a signal to an amplifier is selected from a front microphone and a rear microphone by a changeover switch.

[0004]

Problems to be Solved by the Invention
According to the vehicle with a hearing device proposed in Japanese Patent Publication No. 5 (1993), sound outside the vehicle can be heard well inside the vehicle, but since a plurality of speakers are driven by a common output signal, a sense of direction of the sound cannot be obtained. There is a drawback that it is not possible to judge from which direction the sound is.

[0005] In addition, although the inside of the vehicle is closed, a sense of oppression is felt. However, there is a disadvantage that such a sense of oppression cannot be relieved by sound that does not include a sense of direction.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to reproduce an outside sound of a vehicle including a sense of direction in the vehicle so that an emergency vehicle, etc. It is an object of the present invention to provide an on-vehicle acoustic device that can determine the position of a vehicle only by sound, and in particular, emits sound outside the vehicle without muting when changing the traveling direction of the vehicle or retreating. .

Another object of the present invention is to provide an on-vehicle acoustic device capable of reducing the feeling of pressure in a closed vehicle interior.

[0008]

According to the present invention, there is provided an on-vehicle acoustic device in which a plurality of microphones are arranged at different places outside a vehicle, and a plurality of loudspeakers are arranged at different places in a vehicle cabin. A mute circuit for driving each loudspeaker by the output signal corresponding to each of the microphones and attenuating the signal from the microphone is provided, and the mute circuit is operated manually or by a signal of an operation detection circuit for detecting a signal of a horn switch. The circuit is operated, and when the operation detection circuit detects the signals of the steering angle sensor and the backward ramp switch, the mute circuit is made inoperative.

Further, in the vehicle-mounted acoustic apparatus according to the present invention, a loudspeaker disposed on the left front side of the vehicle compartment is provided with a signal from a microphone disposed outside the vehicle in front of the vehicle in the vehicle width direction center and a signal from a microphone disposed on the left side in the vehicle width direction left traveling direction. The signal from the microphone arranged outside the vehicle is 0.25: 0.75 to 0.75: 0.2
The vehicle is driven by the signal added at a rate of 5 and the loudspeaker arranged on the front right side of the passenger compartment is transmitted to the signal from the microphone arranged outside the vehicle in front of the vehicle in the center in the vehicle width direction and to the outside of the vehicle in the center on the right side in the vehicle width direction. It is driven by a signal obtained by adding a signal from the placed microphone at a ratio of 0.25: 0.75 to 0.75: 0.25, and a loudspeaker placed on the rear left side of the passenger compartment is rearward in the vehicle width direction center traveling direction. The signal from the microphone disposed outside the vehicle and the signal from the microphone disposed outside the vehicle at the center in the leftward traveling direction in the vehicle width direction are 0.25: 0.7.
Driving with a signal added at a ratio of 5 to 0.75: 0.25,
A signal from a microphone disposed outside the vehicle behind the vehicle center in the vehicle width direction and a signal from a microphone disposed outside the vehicle centrally in the vehicle traveling direction rightward in the vehicle width direction are obtained by combining a loudspeaker disposed on the rear right side of the vehicle compartment with 0.25. : 0.75 to 0.75:
Driving with a signal added at a rate of 0.25, a mute circuit for attenuating the signal from the microphone is provided, and the mute circuit is operated manually or by a signal from an operation detection circuit that detects a signal from a horn switch, When the operation detection circuit detects a signal from a steering angle sensor and a reverse ramp switch, the mute circuit is made inoperative.

[0010] In each of the on-vehicle acoustic devices, a signal from each microphone has a pass band of 200H.
The band is limited by a band-pass filter of z to 4 kHz.

[0011] In each of the above-mentioned on-vehicle acoustic devices, each microphone has a single directivity.

[0012]

According to the on-vehicle acoustic device 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, so that the sound source outside the vehicle interior enters the vehicle interior. To generate a three-dimensional sound field,
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 cabin reduces the pressure of the closed cabin space.

According to a second aspect of the present invention, a loudspeaker arranged in the middle direction between a pair of microphones arranged outside the vehicle compartment transmits a signal from those microphones to 0.2.
In the case of driving with a signal added at a ratio of 5: 0.75 to 0.75: 0.25, by changing the mixing ratio according to the listening position, the sense of direction of the sound due to the auditory sense is optimized. be able to.

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 a running sound of a car which is shaking in a low frequency range and a wind noise of a man-crophone are cut off. can do.

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

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. Also, by manually operating the mute circuit, the sound device can be turned on and off arbitrarily.

As described above, when the mute circuit is operated by a horn, the mute circuit is deactivated by the signals of the steering angle sensor and the reverse lamp switch.
When turning left, turning right, and reversing, the sound device is automatically activated, and the trouble of turning on and off the sound device is omitted.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An on-vehicle acoustic device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 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, reference numerals 1a to 1d denote microphones having a single directivity, 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 on the left and right sides of the vehicle in the vehicle width direction at the center in the traveling direction, respectively, and the microphone 1c is mounted on the vehicle exterior at the center in the vehicle width direction and on the rear side in the traveling direction.

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

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

The signals of the microphones 1a and 1d, which have been amplified and band-limited in this way, are added by the mixer 5 at a variable ratio of 0.25: 0.75 to 0.75: 0.25, and furthermore, the mute circuit 7a And is amplified by the power amplifier 4d to drive the loudspeaker 2d.

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

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

As described above, a loudspeaker arranged in the middle direction between a pair of microphones disposed outside the vehicle compartment transmits signals from those microphones to 0.25: 0.75 to 0.75.
Since the driving is performed with the signal added at a variable ratio of 5: 0.25, the sense of direction of the sound by the auditory sense can be set to an optimum state according to the listening position.

The mute circuits 7a to 7d include an operation detection circuit 8
Is controlled by That is, the operation detection circuit 8 switches the mute circuits 7a to 7d between the operation state and the non-operation state.
Signals of a horn switch, a rudder angle sensor, and a reverse lamp switch are input to the operation detection circuit 8, and when the horn sounds or a manual switch is operated, the operation detection circuit 8 is activated.
Sets the mute circuits 7a to 7d to the operating state, and then, when the car turns right or left or reverses, the operation detecting circuit 8 sets the mute circuits 7a to 7d to the non-operating state, and the sound device is set to the operating state.

Although the embodiment is constructed as described above, the invention is not limited to this. For example, three or four
A plurality of microphones may be arranged, and a signal from each of the microphones may drive a loudspeaker in a vehicle compartment arranged in the same direction as the microphones.

[0029]

According to the on-vehicle acoustic device 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, so that the vehicle interior has a vehicle exterior. The sound source can generate a three-dimensional sound field, and the position of an emergency vehicle or the like can be determined from the sound. In addition, the three-dimensional sound field from the sound source outside the cabin reduces the pressure of the closed cabin space. In addition, the mute circuit operated by a manual switch or the like is inactivated when changing the traveling direction of the vehicle or when reversing, so that the sound device is automatically activated when turning right and backward, and the sound device is turned on and off. Time is saved.

[Brief description of the drawings]

FIG. 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.

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

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04R 1/40 310 H04R 1/40 320 H04S 3/00 B60R 11/02

Claims (4)

(57) [Claims] 1. A plurality of microphones are arranged at different places outside the vehicle, a plurality of loudspeakers are arranged at different places inside the vehicle compartment, and each loudspeaker is associated with each microphone and each loudspeaker is output by its output signal. A mute circuit for attenuating a signal from the microphone is provided, and the mute circuit is operated manually or by a signal of an operation detection circuit for detecting a signal of a horn switch. An in-vehicle acoustic device configured to make the mute circuit inoperative when the operation detection circuit detects a signal. 2. A signal from a microphone disposed outside the vehicle in front of the vehicle in the vehicle width direction center and a signal from a microphone disposed outside the vehicle at the center in the vehicle width direction left traveling direction. And 0.25: 0.75
The vehicle is driven by a signal added at a ratio of 0.75: 0.25, and a loudspeaker arranged on the front right side of the vehicle cabin and a signal from a microphone arranged outside the vehicle in front of the vehicle in the center direction in the vehicle width direction and the right side in the vehicle width direction. A signal from a microphone disposed outside the vehicle at the center of the traveling direction is 0.25: 0.75 to 0.75: 0.
Driven by the signal added at a rate of 25, the loudspeaker arranged on the rear left side of the passenger compartment is signaled from the microphone arranged outside the vehicle behind the vehicle in the center direction in the vehicle width direction and the signal from the microphone arranged in the center on the left side in the vehicle width direction. It is driven by a signal obtained by adding a signal from the arranged microphone at a ratio of 0.25: 0.75 to 0.75: 0.25, and a loudspeaker arranged on the right rear side of the cabin is rearward in the vehicle width direction center traveling direction. The signal from the microphone arranged outside the vehicle and the signal from the microphone arranged outside the vehicle at the center in the rightward traveling direction in the vehicle width direction are 0.25: 0.7.
A mute circuit is provided which is driven by a signal added at a ratio of 5 to 0.75: 0.25 and attenuates a signal from the microphone, and which is manually or by an operation detection circuit for detecting a signal of a horn switch. An on-vehicle acoustic device configured to operate a mute circuit, and when the operation detection circuit detects signals from a steering angle sensor and a reverse ramp switch, the mute circuit is made inoperative. 3. The on-vehicle acoustic device according to claim 1, wherein a signal from each microphone is band-limited by a band-pass filter having a pass band of 200 Hz to 4 kHz. 4. The on-vehicle acoustic device according to claim 1, wherein each microphone has a single directivity.