JPS60123200A - Acoustic device for car - Google Patents

Abstract

PURPOSE:To enable crews at both front and rear seats to hear the sounds of approximately same and satisfactory level, by controlling automatically the sound volume reproduced through a speaker according to the sound volume actually received at either front or rear seats. CONSTITUTION:Microphones 10 and 11, a comparator 14 and a control means like an arithmetic circuit 18, etc. are turned on by a switch or a seat sensor of a crew at a rear seat. Then the hearing sound pressure is sensed by microphones 10 and 11 at the front and rear seats, and the voltage equivalent to the sound pressure level is outputted through both microphones 10 and 11. The outputs of both microphones are amplified by amplifiers 12 and 13 and read by a comparator 14. The comparator 14 outputs a control signal to a control circuit 21. The circuit 21 controls automatically both front and rear volumes 22 and 23 in response to the received control signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vehicle river sound #device, and more particularly, to a device for detecting excessive or insufficient listening sound based on the difference in layer pressure positions between front seat occupants and rear seat occupants. Regarding the resolved vehicle audio system.

PRIOR ART As a conventional vehicle audio system, there is one shown in Figure 1 for example (Nl5SAN service broadcast No. 428).
No. (LP-1) 260). That is, the E signal output from a stereo source 1 such as a tuner cassette deck installed in the vehicle interior is divided into left and right channels by a preamplifier 2, and is further amplified by a main amplifier 3.

On the other hand, there is a front door 5a on the side of the front seats 4a and 4b.

Left and right front speakers 5a and 5ib are provided on the inside of the rear seat 7 to reproduce left and right channel signals, respectively. rear speaker 9a,
9b is provided. Each of these speakers 5a, b%9a
, b, the corresponding valley channel signals are inputted from the main amplifier 3, and the front speakers 5a
, b (!: IJ Yasspeaker 9a, sound 1d between speakers 9a and b
Relative sound Jt adjustment is now possible using the fader control which is an adjustment means and the balance control i-roll which is a sound and electric adjustment means between each left speaker 6a, 9a and each right speaker fia, 9b. ing.

For example, if occupants M, M, M3, and M are seated in the front seats 4a, 4b, 'f and 7, respectively, the fader and balance control positions are both set, and the valley speakers (ia, By making the reproduced sound covers from b, qa, and b equal and setting the sound image at the center in the east direction (sound image of the oscillator 1 yon), a 1" oscilloscope sound is obtained.

However, in such a vehicle acoustic device M,
The ear position 11 relative to the Yasby force 9a, b of the rear seat occupant M, , +114 in the seated state is the front seat occupant M,.

M2 front speaker fia,b
Therefore, if the reproduction volume from the valley speakers 6alb+9a+b is made equal as described above, if the listening volume is appropriate for the front seat occupant)tM+*Mt, then the rear seat occupant M,... For M, the volume becomes excessive and unpleasant, and for
,, If the listening volume of M4 is set to an appropriate level, the listening volume of M2 will be too low, resulting in the disadvantage that powerful reproduced sound cannot be obtained.

Also, using the fader control mentioned above, it is possible to adjust the listening volume of the rear seat occupants M,, M, but these six cycles are performed exclusively by the front seat occupants MI+H, Passenger) AH, M2 is rear seat passenger J,
Since it was not possible to directly hear the M4's listening volume, it was not possible to perform delicate control so that the listening volume was approximately the same for both passengers.

Purpose of the Invention The present invention has been made in view of the current state of the conventional vehicle audio system, and is based on the present invention.
l-'J! on at least one seat side in a dual-purpose audio system equipped with speakers for stereo reproduction. ．． A vehicular audio device that enables front seat occupants and rear seat occupants to obtain approximately the same listening sound with no excess or deficiency by automatically controlling the playback volume of the speaker based on the remaining listening volume. The purpose is to provide the following.

Structure of the Invention In order to achieve the above object, the present invention includes an amplifier for amplifying left and right channel signals output from a suitable stereo source, and an in-vehicle unit for reproducing each signal amplified by the amplifier. a plurality of speakers arranged respectively on the front seat side and the rear seat side of the vehicle; a detection device for detecting the sound pressure heard by the speakers in at least one seat; A control means for controlling the reproduction volume of each speaker is provided so that the listening volumes of the plurality of occupants are approximately the same, and automatic control is provided so that the listening volumes of the plurality of passengers are approximately the same.

Embodiment Hereinafter, one embodiment of the present invention will be described, with the same parts and members as those of the conventional device being denoted by the same reference numerals.

As shown in Figure 2, the front seat 4b? Note back 4b'
A front microphone 10 and a rear microphone 11 are provided at the left end of the seatback 7' of the rear seat 7 as a detection device for detecting the sound pressure of the reproduced sound at the core, and output signals of both microphones 10 and 11 are provided. is amplifier 1
2 and 13, and is manually inputted to a ratio converter 14. As shown in FIG.
J has A and /D converters 15 and 16 that convert the outputs of the amplifiers 12 and 13 into A and /'D, and these A/'D converters 15 and 16 are provided.
The converted output 1 is read and recorded at regular intervals by a memory part 17 of the microcomputer, and the output from the memory part J7 is input to an arithmetic circuit J8.

Further, this comparator 14 is installed near the front seat 4b (driver's seat), and a front speaker 6a is used by the passenger.

A trimmer 19 is provided to set the sound pressure balance ratio between the rear speakers 9a and 9b, and the set voltage value output from the core trimmer 19 is A/D converted by an A/D converter 20 and an arithmetic circuit 18. has been entered. The arithmetic circuit 18 thereby reads the sound pressure balance ratio of the front speakers 6a, 1:+rear speaker force 9a, b set by the trimmer 19, and outputs the output from the front microphone 10 (i.e., the front seat side receiver). The output from the rear microphone 11 (i.e., the listening sound pressure on the rear seat side) is the output 11η from the front microphone IO which is first CC10ed by the memory part 17. A signal is output to the control circuit 21 in order to asymptotically approach the value obtained by multiplying M'T N by the balance ratio of the sound pressure.

On the other hand, a front volume 22 and a rear volume 23 are provided between the main amplifier 3, front speakers 6a, b, and rear speakers 9a, b, respectively, and both volumes 22 and 23 are output from the control circuit 21. The control signal is controlled by the predetermined control signal.

In this embodiment having the above-described configuration, an occupant is seated in the rear seat 7.
When sitting in a sitting position, the control circuit 21 does not control both the volumes 22 and 23, but sets the balance and fader controls to neutral positions and outputs each speaker 6.
When you play the audio from a r b * 9 a+ b,
As shown in Fig. 4(A), each speaker is 68°b, 9
An equivalent value, for example 0.5 V, is input to a and b, and an equivalent reproduced sound is emitted, and at this time Yasby force 9a, b
The sound pressure at the rear seat passenger's ear position, which is close to the front seat passenger, is 85 dB, which is much longer than the sound pressure at the front seat passenger's ear position, which is 80 dB. B, which is excessive for rear seat passengers.

Then, the microphones 10, 11 and the comparator 14. Control means such as the arithmetic circuit 18 are turned on. As a result, the sound pressure heard on the front and rear seats is sensed by the microphones 1.0 and 11, respectively, and the pressure r corresponding to this sound pressure level is detected by both the microphones 10 and 1.
It is output from 11. This output is amplified by an amplifier 12.13 and read by a comparator 14, which comparator 8x14 outputs a predetermined control signal 13 to a control circuit 2I as described above, which in turn outputs a predetermined control signal 13 to a control circuit 2I. Based on this, the front volume z2 and the rear volume 23 are automatically controlled.

As a result, if the setting ratio of the trimmer 19 is set to 1=1, that is, the same fertilization stitch is set for both the front and rear seats, for example, the front speakers 5a and 5b will be set to 06v, and the rear speakers 9a and 9b will be set to 06v.
b is automatically controlled to 0.3V, and as a result, without changing the sound pressure level on the rear seat side, the sound pressure level on the rear seat side is reduced to 80 dB, which is the same as the front seat side (rear seat side and front seat side). The sound pressure ratio can be controlled to 1=1), and both occupants can hear the sound at the same sound pressure level. Moreover, it is possible to achieve the same sound pressure level in both cases without substantially reducing the total sound pressure in the entire vehicle interior, unlike when the balance and fader controls are manually adjusted.

In this embodiment, a microcomputer is used as the comparator 14, but the same effect can be obtained with only a circuit using analog elements, and detection via the microphone IQ, 11 is also possible. Of course, the sound pressure may be either an instantaneous value or an average value within a certain period of time.

FIG. 5 shows another embodiment of the present invention, which enables easier volume control. i.e. front seat 4
Microphones +o and 11 similar to those in the previous embodiment are provided on the valley seatbacks 4b' and 7' of the rear seats 7 and 7', and the output signals from the microphones to and ti are as follows.
Processing is performed by a control mechanism (not shown) similar to that of the previous embodiment.

On the other hand, the rear seat 7 is provided with seat switches 24 and 25 that are turned on when the occupant is seated.The seat switches 24 and 25 are connected to a switch 27 that opens and closes a power supply 26 for the main amplifier 3, and both are connected to an A N D circuit 28. It is connected to the.

On the other hand, a relay 29 and a variable resistor 30 are provided in the circuit between the main amplifier 3 and the rear speakers 9a and 9b.
The relay 29 is operated by an AND circuit 28 shown in l1fJ.

In this embodiment of the above configuration, the front seat 4a.

When the switch 27 of the main amplifier 3 is closed with the occupant seated only in the rear speaker, the signal amplified by the main amplifier 3 is manually transmitted to the rear speakers 9a and 9b without passing through the variable resistor 30. At the same time, the front speakers 6a' and 6b are also powered, and each speaker reproduces the sound at approximately the same volume. Then, when the passenger next places his or her shoulder in the rear seat 7, the seat switch 24 or 25 closes.
When the AND circuit 28 becomes Hlgh, the relay 20 becomes Yasby force 9a.

The circuit between b is changed to a circuit via a variable resistor 3o.

Therefore, from the main amplifier 3 to the rear speaker 9a.

The voltage of the signal to b is reduced by the resistor of the 'ciJ resistor 3o, and the sound reproduced by the rear speakers 9a and b is automatically muted. Therefore, if the sound reproduced by each speaker fia, b, 9a, and b is the same, the excessive listening sound can be reduced by this mute, and the noise between the passengers sitting in the rear seat 7 and the front seat passenger can be reduced. Almost the same received sound can be obtained.

Note that the mute level can be set arbitrarily by changing the resistor of the variable resistor 3o.
and 9b are set to the same volume to perform control before the received sound, but each speaker 6a.

If 6b, 9a, and 9b are controlled to 1, it will be possible to equalize the listening volume more accurately than -c5 for each occupant who has pressure on the front seats 4a and b% and the rear seat 7. Become.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention provides a vehicle audio system in which a pair of speakers for stereo reproduction is provided on each of the front seats and the rear seats. Based on this, the playback sound t from each speaker is automatically controlled so that the sound waves received on both occasions are approximately the same. Passengers sitting in seats that are close to the speaker can enjoy the Ensei sound in an appropriate manner, with the same listening sound source as other Tiger passengers, without excessive listening. . Additionally, this allows the occupants in the 10,000th seat to recognize the listening volume of the occupants in the 10,000th seat based on their own listening volume, so they can also take the rear seat occupants into consideration without operating fader controls. Close volume control
4j can be done.

In addition, in the embodiment shown in Ml, =jl seat (II
I is also equipped with a microphone to detect the listening volume, and while comparing the listening sound signals from the rear seat side and the front seat side, the listening volume is adjusted to the open side 1, so that the listening volume J can respond to changes in conditions. Furthermore, since the second embodiment has an easy-to-understand structure, it can be implemented at low cost.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an example of a conventional vehicle acoustic device, Fig. 2 is an explanatory diagram showing an embodiment of the present invention, and Fig. 3 is an explanatory diagram showing the structure of a comparator according to the same embodiment. , Figure 4(A),
(Bl is an explanatory diagram showing the operation of the same embodiment, and FIG. 5 is a circuit explanatory diagram showing another embodiment of the present invention. Stereo source, 2 preamplifier, 3 main amplifier, 4 a, b-An seats. , fia, b - Left and right front speakers, 7 - Rear seat, 10... Front microphone, 11... Rear microphone, 12. 13 - Amplifier, 14 Comparator, 15, 16 - A/D converter, 17... Microcomputer Part of the memory of 18.
...Arithmetic circuit, 19...Trimmer, 20-A/D
Converter, 21...Control 00 path, 22.Volume for front, 2:3...Volume for rear. Figure 3 + 5dB 0dB

Claims (1)

[Claims] (1) An amplifier that amplifies left and right channel signals output from an appropriate stereo source, and each signal amplified by the amplifier is reproduced. A plurality of speakers respectively arranged on the front seat side and the rear seat side in the vehicle interior, a detection device for detecting the listening sound pressure of the speakers in at least 10,000 seat positions 1i yen, and an output signal of the detection device. 1. A vehicular audio device comprising: control means for controlling the playback volume of each speaker so that the listening volume of both occupants is approximately the same based on the above.