JPH07222277A - In-vehicle sound field automatic correcting system - Google Patents

Abstract

PURPOSE:To provide the in-vehicle sound field automatic correcting system for a liestener to listen to music or the like with a balanced sound field at all times even when a seat or a seat back is moved. CONSTITUTION:When the seat back of a right front seat where the listener sits down is set forward rather than a standard position, for example, position deviation between seat back upper part and a left front seat back upper part is detected by a seat position detecting means 1 and corresponding to this position deviation, a driving means 2 turns sound direction panels 8L and 8R toward the seat back of the right front seat and outputs sounds from rear left and right speakers 11 and 12 toward the seat back of the right front seat so as to balance the sound field.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle interior sound field automatic correction system for automatically correcting a sound field formed by an audio system mounted in a vehicle cabin such as a passenger car. The present invention relates to a vehicle interior sound field automatic correction system for automatically correcting a sound field formed by rear speakers arranged on both sides of a rear portion of a vehicle interior when a seat or a seat back is moved back and forth.

[0002]

2. Description of the Related Art Conventionally, a stereo type audio system having a plurality of speakers is mounted in a vehicle compartment in order to enjoy music or the like in the vehicle compartment such as a passenger car. Eg 4
4 equipped with an audio system with individual speakers
In passenger cars with doors, the front left speaker is on the side of the front left door, the front right speaker is on the side of the front right door, the rear left speaker is on the side of the rear left door, and the rear right speaker is on the side of the rear right door. It is often arranged in each case. With such a speaker arrangement, left-channel stereo sound is output from the front and rear left speakers, and right-channel stereo sound is output from the front and rear right speakers.

[0003]

By the way, in the passenger compartment 16 of a passenger car as shown in FIG. 9, the right front seat 21 which is the driver's seat and the left front seat 20 which is the passenger seat are, for example, in a standard position (moveable center). Position (when the seat backs 22 and 23 are also set to the standard inclination angle in this case), the right front seat 21
The listener 15 who sits on the stereophonic sound output from the front left speaker 9, the front right speaker 10, the rear left speaker 11, and the rear right speaker 12, which are usually attached to the side surface 17 of the vehicle interior such as the side surface of the door, at this position. In order to balance the sound field by the sound system, the volume balance adjusting volume, the equalizer volume, the volume adjusting volume (neither shown), etc. provided in the audio system main body 19 are operated to operate the speakers 9, 10, 11, The volume and frequency characteristics from 12 are adjusted.

However, when the listener 15 moves the right front seat 21 on which he / she sits forward or backward, or when the seat back 23 of the right front seat 21 is tilted forward or backward, the sound field balance is disturbed. That is, when the front right seat 21 is moved forward (the position of the seat 21 in this case is shown in FIG. 3) and the seat back 23 is raised forward, the head of the listener 15 moves forward. Of the sound output from the speakers 9, 10, 11, and 12, the component reaching the left ear of the listener 15 from the rear left speaker 11 is blocked and attenuated by the seat back 22 of the left front seat 20 or the like. , The sound pressure at the position of the listener 15 decreases. As a result, the listener 15 will listen to music or the like in a state where the sound field balance is lost.

On the contrary, when the front right seat 21 is moved backward (see FIG. 4 for the position of the front right seat 21 in this case) or the seat back 23 is tilted rearward, the head of the listener 15 is As a result of moving to the rear, among the sound outputs from the speakers 9, 10, 11, and 12, the component reaching the left ear of the listener 15 from the rear left speaker 11 is blocked by the seat back 22 or the like of the left front seat 20. The sound pressure is not reduced, and the sound pressure reaches the left ear of the listener 15 directly without lowering. As a result, the listener 15 will listen to music or the like in a state where the sound field balance is lost.

Therefore, in order to correct such a collapse of the sound field balance, conventionally, the left and right balance adjusting volumes and the like were manually operated to balance the volume of the left and right speakers, but such an operation is very difficult. There is a problem in that the volume of the left and right speakers must be readjusted when the seat is returned to its original position again.

The present invention has been made in order to solve such a problem and has a sound field that is always balanced for a listener regardless of the position of the front seat or the seat back of the vehicle interior. It is an object of the present invention to provide a vehicle interior sound field automatic correction system capable of correcting so as to form a noise.

[0008]

In order to achieve the above object, a vehicle interior sound field automatic correction system (1) according to the present invention comprises:
A sound field correction is automatically performed for an audio system having a speaker on at least both rear sides of a passenger compartment, and seat position detecting means for detecting an upper position of a seat back of left and right front seats, and a front surface of the speaker. It is characterized in that it is provided with a voice directing plate which is provided respectively for controlling the voice output direction of these speakers, and a drive means for driving the voice directing plate based on a detection signal of the seat position detecting means.

Further, in the vehicle interior sound field automatic correction system (2) according to the present invention, the seat position detecting means detects a deviation in relative position between the seat back upper part of the left front seat and the seat back upper part of the right front seat. It is characterized by that.

[0010]

If, for example, the seat back of the front seat on which the listener sits is set before the standard position, the upper part of the seat back of the right front seat will also be positioned before the standard position. Vehicle interior sound field automatic correction system (1)
According to the above, the seat position detecting means detects the upper position of the seat back of the right front seat and the upper position of the seat back of the left front seat, and the detection signal is given to the driving means. The driving means drives at least the sound directing plates provided on the front surfaces of the rear left and right speakers based on the detection signal, and these sound directing plates are directed toward the seat back of the front right seat to output from the rear left and right speakers. The sound is output with directivity to the seat back of the front right seat.

Further, according to the vehicle interior sound field automatic correction system (2) having the above-mentioned structure, the seat position detecting means detects the relative positional deviation between the seat back upper part of the left front seat and the seat back upper part of the right front seat. Then, the drive means is driven based on the displacement of the relative position.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle interior sound field automatic correction system according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a vehicle interior sound field automatic correction system according to an embodiment. FIG. 2 is a partial plan cross-sectional view of the passenger car showing a standard arrangement of seats, speakers and the like provided in the passenger compartment of the passenger car. As shown in FIG. 2, the passenger compartment 16 of the passenger car
A left front seat 20 and a right front seat 21 are arranged inside. The rear sheet is not shown in the drawing because it is not so relevant to the present invention. A rear left speaker 11 is provided on the side surface 17a of the rear left door near the rear of the left front seat 20, and a rear right speaker 12 is provided on the side surface 17b of the rear right door near the rear of the right front seat 21. Also, the side surface 17 of the front left door near the front of the left front seat 20
The front left speaker 9 is provided in c, and the front right speaker 10 is provided on the side surface 17d of the front right door near the front of the right front seat 21. The position sensors L1, L2, L3, which are realized by optical sensors or magnetic sensors, are within the moving range above the seat back 22 of the left front seat 20,
For example, it is attached to the side surface 17c of the front left door or the ceiling at a predetermined interval. Position sensors R1, R2,
The R3 is located within the moving range above the seat back 23 of the right front seat 21, and is attached to the side surface 17d of the front right door or the ceiling at a predetermined interval, for example. An audio directing plate 8L for controlling the directivity of audio output is attached to the front surface of the rear left speaker 11, and an audio directing plate 8R for controlling the directivity of audio output is also attached to the front surface of the rear right speaker 12.

In FIG. 1, reference numeral 1 denotes a seat position detecting means, which is an upper position of a seat back 22 of a left front seat 20 and a right front seat 2.
The position sensor L1, L2, L3 and the position sensor R detect the upper position of the first seat back 23.
1, R2, R3 and the input terminals are position sensors L1, L2, L
3 is connected to the decoder 3 and the input end is the position sensor R
1, a decoder 4 connected to R2, R3, and a shift comparison operation circuit 5 whose input end is connected to the output end of the decoder 3 and the output end of the decoder 4. A driving means 2 is connected to the seat position detecting means 1, and the driving means 2 includes motor drive circuits 6L and 6R and step motors 7L and 7R, and a left sound direction plate 8L and a right sound direction plate 8R.
Is driven based on the detection signal of the sheet position detecting means 1. The input ends of the motor drive circuits 6L and 6R are connected to the output ends of the displacement comparison calculation circuit 5, the output ends thereof are connected to the step motors 7L and 7R, respectively, and the step motors 7L and 7R are connected to the voice direction plates 8L and 8R. There is.

FIG. 5 is a front sectional view schematically showing the vicinity of the voice directing plate 8L, and FIG. 6 is a voice directing plate 8 in FIG.
It is a schematic plan view which looked at L part from the top. Since the left-side voice directing plate 8L and the right-side voice directing plate 8R have the same configuration symmetrically, the configuration of the left-side voice directing plate 8L will be described with reference to FIGS. 5 and 6. Reference numeral 25 denotes a case of the voice directing plate 8L, and this case 25 is attached to the front surface of the rear left speaker 11. Voice direction board 8
L is rotatably supported by pins 39 and 42 fixed to the upper and lower opposite side surfaces of the case 25, respectively, and as shown in FIG. 6 on the back surface at a height position of about ¼ from the top. It has a connecting rod mounting portion 38, and this connecting rod mounting portion 3
A connecting rod 27 is attached to 8 via a pin 40. One end of a rack gear 30 is connected to the right end of the connecting rod 27 in the figure via a connecting rod 28 and a rack connecting rod 29. The connecting rod 28 is the connecting rod 27 and the rack connecting rod 2
It is rotatably connected to 9. Rack gear 30
The pinion gear 31 meshes with the pinion gear 31, the worm wheel gear 33 meshes with the pinion gear 31, and the worm wheel 35 meshes with the worm wheel gear 33. A rotating shaft 37 of the step motor 7L is fixed to the worm gear 35, and the step motor 7L is fixed to the bottom surface of the case 25. The rack connecting rod 29 is supported by the support frame 26 so as to be movable in the left-right direction in the drawing. As shown in FIG. 7, the case 25 has a front panel 43 with a portion corresponding to the front surface of the rear left speaker 11 removed.

Next, the operation when the step motor 7L rotates will be described with reference to FIG. First, when the step motor 7L rotates counterclockwise as viewed from the rotary shaft 37 side, the worm gear 35 rotates counterclockwise, and accordingly, the worm wheel gear 33 rotates counterclockwise when viewed from the front and the pinion gear 31 rotates clockwise. As a result, the rack gear 30 moves to the right in the figure, and the connecting rod 27 is pulled to the right accordingly. Therefore, the sound directing plate 8L rotates rightward in plan view about the pin 39 by a predetermined angle, and the directivity of the sound directing plate 8L is set to the left.

On the other hand, when the step motor 7L rotates clockwise as viewed from the rotary shaft 37 side, the worm gear 35 rotates clockwise,
Along with this, the worm wheel gear 33 rotates right when viewed from the front, and the pinion gear 31 rotates counterclockwise. As a result, the pinion gear 30 moves leftward in the drawing, and the connecting rod 27 is pulled leftward accordingly. Therefore, the voice directing plate 8L rotates leftward in plan view about the pin 39 by a predetermined angle, and the directivity of the voice directing plate 8L is set to the right direction.

The left directivity of the voice directing plate 8L in the above description of FIG. 5 corresponds to the case where the voice directing plate 8L faces rearward as shown in FIG. The directivity of the voice directing plate 8L to the right corresponds to the case where the voice directing plate 8L faces forward as shown in FIG.

In the above embodiment, the rack gear 30 and the pinion gear 3 are used as means for driving the sound directing plate 8L.
1, the case of using the worm wheel gear 33, the worm gear 35, the step motor 7L, etc. has been described.
The present invention is not limited to this, and in another embodiment, a rod corresponding to the rack connecting rod 29 may be moved leftward and rightward stepwise by using a solenoid or the like. Also, FIG.
Pinion gear 31 and worm wheel gear 33 shown in
May be composed of one gear in another embodiment. Also,
The pinion gear 31 may be directly attached to the rotary shaft 37 of the step motor 7L, but in this case, since the worm gear configuration is not used, even if the sound directing plate 8L is set at a predetermined position, it may move due to vibration or the like later. Is not so preferable.

Next, the operation of the vehicle interior sound field automatic correction system according to this embodiment will be described with reference to the flowcharts shown in FIGS. 1 to 7 and 8. In FIG. 8, L represents a numerical value obtained by decoding the detection signals of the position sensors L1, L2, and L3 (hereinafter, referred to as a left detected numerical value), and R represents a position sensor R
Numerical values (hereinafter, referred to as right detection numerical values) obtained by decoding the detection signals of 1, R2, and R3 are shown. B indicates the reference numerical value when the upper portions of the seat backs 22 and 23 of the left and right front seats 20 and 21 are in the standard position. The positions of the heads of the listeners 15 are the left and right front seats 20, 21 and the seat backs 22, 2.
When it is moved, since it can be regarded that the position of the seat back 22 and the upper position of the seat back 23 are substantially the same, the position sensors L1 and L
2, L3 and the respective position sensors R1, R2, R3 are set so as to detect the upper position of the seat backs 22, 23.

For example, in the state shown in FIG. 2, the upper portions of the seat backs 22 and 23 of the left and right front seats 20 and 21 are in standard positions, and the output signals of the position sensor L2 and the position sensor R2 are, for example, high level signals (hereinafter, logic "1"). )), And the output signals of the other position sensors L1, L3, R1, and R3 are, for example, low level signals (hereinafter referred to as logic “0”). Therefore, logic “010” is input to the decoders 3 and 4, respectively. As a result, the decoders 3 and 4 output respective decoded signals indicating signals corresponding to the numerical value "2", for example. The respective decoded signals are given to the shift comparison operation circuit 5, recognized as the left detection value L and the right detection value R, and compared with the reference value B. In this case, the difference becomes 0, and the motor drive circuit 6L. , 6R do not operate, and therefore the left sound direction plate 8L and the right sound direction plate 8R are oriented vertically with respect to the front surface of the rear left speaker 11 and the front surface of the rear right speaker 12, as shown in FIG. Be maintained in a closed state.

Such an operation is performed according to the flowchart shown in FIG. First, in step 1, it is judged whether or not a signal to be compared is input to the shift comparison calculation circuit 5. That is, it is determined whether or not the decoded signals from the decoders 3 and 4 are input. When it is determined that the signal is input in step 11, the process proceeds to step 2,
In step 2, the decoded signal is recognized as a left detection value L and a right detection value R. Next, in step 3, it is determined in step 3 whether the left detection value L = reference value B = right detection value R, for example, in the case of the seat back position of FIG. 2, it is determined that L = B = R. Then, the process proceeds to step 4, and in step 4, the left and right voice direction plates 8L, 8
A signal for directing R in the vertical direction is output. As a result, the motor drive circuits 6L and 6R are connected to the step motor 7
The L and 7R are rotated to orient the left and right sound directing plates 8L and 8R in the vertical direction. If the left and right sound direction plates 8L, 8R have already been oriented in the vertical direction, the motor drive circuit 6L,
6R does not work.

On the other hand, if it is determined in step 3 that L = B = R is not satisfied, the process proceeds to step 5 and L = B <R.
Is determined. The case of L = B <R is the case where the upper part of the seat back 23 of the right front seat 21 is located in front of the standard position as shown in FIG. In this case, the position sensor L2 detects the upper part of the seat back 22 of the left front seat 20, the position sensor R1 detects the upper part of the seat back 23 of the right front seat 21, the logic “010” is input to the decoder 3, and the decoder 4 is input. Is a logical "1
00 ”is input. Therefore, the decoder 3 outputs the decoded signal indicating the numerical value "2", and the decoder 4 outputs the decoded signal indicating the numerical value "4". As a result, in step 5, the left detected numerical value L of the numerical value "2", the reference numerical value B of the numerical value "2" and the right detected numerical value R of the numerical value "4" are compared to determine whether L = B <R. And L
When it is determined that = B <R, the process proceeds to step 6, and a signal for directing the voice direction plates 8L and 8R forward is output. As a result, the motor drive circuits 6L and 6R rotate the step motors 7L and 7R, and the sound directing plates 8L and 8R.
Point forward. Therefore, as shown in FIG. 3, even if the left front seat 20 is in the standard position and the seat back 23 is located in the front, the listener 15 sitting on the right front seat 21 can listen to music or the like in which the sound field is balanced. .

On the other hand, when it is judged in step 5 that L = B <R is not satisfied, the process proceeds to step 7 and L = B> R.
Is determined. The case of L = B> R is the case where the seat back 23 of the right front seat 21 is located behind the standard position as shown in FIG. In this case, the position sensor L2 is the seat back 2 of the left front seat 20.
2 The upper part is detected, the position sensor R3 detects the upper part of the seat back 23 of the right front seat 21, and the decoder 3 receives the logic "0".
10 ”is input, and the logic“ 001 ”is input to the decoder 4. Therefore, the decoder 3 outputs the decoded signal indicating the numerical value "2", and the decoder 4 outputs the decoded signal indicating the numerical value "1". As a result, in step 7, the left detected numerical value L of the numerical value "2", the reference numerical value B of the numerical value "2", and the right detected numerical value R of the numerical value "1" are compared to determine whether L = B> R. And L = B
When it is determined that> R, the process proceeds to step 8, and a signal for directing the voice direction plates 8L and 8R backward is output. As a result, the motor drive circuits 6L and 6R rotate the step motors 7L and 7R, and the sound directing plates 8L and 8R.
Turn to the rear. Therefore, as shown in FIG. 4, even if the left front seat 20 is in the standard position and the seat back 23 is in the rear position, the listener 15 sitting on the right front seat 21 can listen to music or the like in which the sound field is balanced. it can.

On the other hand, when it is judged in step 7 that L = B> R is not satisfied, the routine proceeds to step 9, where L> B = R.
Is determined. When L> B = R, the seat back position is not shown, but the upper part of the seat back 22 of the left front seat 20 is in front of the standard position and the upper part of the seat back 23 of the right front seat 21 is in the standard position. is there. In this case, the position sensor L1 is the front left seat 2
The position sensor R2 detects the upper part of the seat back 23 of the right front seat 21, the logic "100" is input to the decoder 3, and the logic "010" is input to the decoder 4. . Therefore, the decoder 3 outputs the decoded signal indicating the numerical value "4", and the decoder 4 outputs the decoded signal indicating the numerical value "2". As a result, in step 9, the left detected numerical value L of the numerical value "4", the reference numerical value B of the numerical value "2", and the right detected numerical value R of the numerical value "2" are compared to determine whether L> B = R. If it is determined that L> B = R, the process proceeds to step 10, and a signal for directing the voice directing plates 8L and 8R backward is output. Then, by the operation of the driving means 2, the sound directing plates 8L and 8R are directed rearward. Therefore, even if the seat back 22 is located in the front and the seat back 23 is located in the standard position, the listener 15 sitting on the right front seat 21 can listen to music or the like in which the sound field is balanced.

On the other hand, if it is judged at step 9 that L> B = R is not established, then the processing advances to step 11, at which it is judged whether L <B = R. When L <B = R, the seat back position is not shown, but the upper part of the seat back 22 of the left front seat 20 is behind the standard position and the upper part of the seat back 23 of the right front seat 21 is in the standard position. is there. In this case, the position sensor L3 detects the upper part of the seat back 22 of the left front seat 20, and the position sensor R3
2 detects the upper portion of the seat back 23 of the right front seat 21, the logic “001” is input to the decoder 3, and the logic “010” is input to the decoder 4. Therefore, the decoder 3 outputs the decoded signal indicating the numerical value "1", and the decoder 4 outputs the decoded signal indicating the numerical value "2". As a result, in step 11, the left detected numerical value L of the numerical value "1", the reference numerical value B of the numerical value "2", and the right detected numerical value R of the numerical value "2" are compared to determine whether L <B = R. When it is determined that L <B = R, the process proceeds to step 12, and a signal for directing the voice direction plates 8L and 8R forward is output. Then, the sound directing plates 8L and 8R are directed forward by the operation of the driving means 2. Therefore, even if the seat back 22 is located rearward, the listener 15 sitting on the front right seat 21 can listen to music or the like in which the sound field is balanced.

On the other hand, if it is judged at step 11 that L <B = R is not satisfied, then the processing advances to step 13, at which L = R> B.
Is determined. The case of L = R> B is a case in which the seat back position is not shown, but both the upper part of the seat back 22 of the left front seat 20 and the upper part of the seat back 23 of the right front seat 21 are in front of the standard position. In this case, the position sensor L1 detects the upper part of the seat back 22 of the left front seat 20, the position sensor R1 detects the upper part of the seat back 23 of the right front seat 21, and the logic "100" is input to the decoder 3, and the decoder The logical value “100” is input to 4. Therefore, the decoder 3 outputs the decoded signal indicating the numerical value "4", and the decoder 4 outputs the decoded signal indicating the numerical value "4". As a result, in step 13, the left detected numerical value L of the numerical value "4", the reference numerical value B of the numerical value "2", and the right detected numerical value R of the numerical value "4" are compared to determine whether L = R> B. When it is determined that L = R> B, the process proceeds to step 14, and a signal for directing the voice direction plates 8L and 8R forward is output. Then, the sound directing plates 8L and 8R are directed forward by the operation of the driving means 2. Therefore,
Even if the seat backs 22 and 23 are both positioned forward, the listener 15 sitting on the right front seat 21 can listen to music or the like with a sound field balanced.

On the other hand, when it is judged in step 13 that L = R> B is not satisfied, the routine proceeds to step 15, where L = R.
It is determined whether or not <B. The case of L = R <B is a case where the seatback position is not shown, but both the upper part of the seatback 22 of the left front seat 20 and the upper part of the seatback 23 of the right front seat 21 are behind the standard position. In this case, the position sensor L3 detects the upper part of the seat back 22 of the left front seat 20, the position sensor R3 detects the upper part of the seat back 23 of the right front seat 21, and the logic "001" is input to the decoder 3, and the decoder The logic “001” is input to 4. Therefore, the decoder 3 outputs the decoded signal indicating the numerical value "1", and the decoder 4 outputs the decoded signal indicating the numerical value "1". Thus, in step 15, the left detected value L of the numerical value "1", the reference numerical value B of the numerical value "2" and the right detected numerical value R of the numerical value "1" are compared to determine whether L = R <B. When it is determined that L = R <B, the process proceeds to step 16, and a signal for directing the voice directing plates 8L and 8R in the vertical direction is output. Then, the operation of the driving means 2 causes the sound directing plates 8L and 8R to be oriented in the vertical direction.
Therefore, even if both seat backs 22 and 23 are located rearward, the listener 15 sitting on the front right seat 21 can listen to music or the like with a sound field balanced.

On the other hand, when it is judged in step 15 that L = R <B is not satisfied, the routine proceeds to step 17, where L>B> R.
Is determined. When L>B> R, the seatback position is not shown, but the left front seat 20
This is the case where the upper part of the seat back 22 is in front of the standard position and the upper part of the seat back 23 of the right front seat 21 is in rear of the standard position. In this case, the position sensor L1 detects the upper part of the seat back 22 of the left front seat 20, the position sensor R3 detects the upper part of the seat back 23 of the right front seat 21, and the logic "100" is input to the decoder 3 and the decoder The logic “001” is input to 4. Therefore, the decoder 3 outputs the decoded signal indicating the numerical value "4", and the decoder 4 outputs the decoded signal indicating the numerical value "1". As a result, in step 17, the left detected numerical value L of the numerical value "4" and the reference numerical value B of the numerical value "2".
Is compared with the right detected numerical value R of the numerical value "1", and L>B> R
If it is determined that L>B> R, the process proceeds to step 18, and the voice direction plates 8L, 8
A signal for directing R to the rear is output. Then, by the operation of the driving means 2, the sound directing plates 8L and 8R are directed rearward. Therefore, the upper part of the seat back 22 is forward,
Even if the upper part of the seat back 23 is located rearward, the listener 15 sitting on the right front seat 21 can listen to music or the like in which the sound field is balanced.

On the other hand, when it is judged in step 17 that L>B> R is not satisfied, the routine proceeds to step 19, where L <B <R.
Is determined. When L <B <R, the seat back position is not shown, but the left front seat 20
This is the case where the upper part of the seat back 22 of is the rear of the standard position and the upper part of the seat back 23 of the right front seat 21 is in front of the standard position. In this case, the position sensor L3 detects the upper part of the seat back 22 of the left front seat 20, the position sensor R1 detects the upper part of the seat back 23 of the right front seat 21, and the logic "001" is input to the decoder 3, and the decoder The logical value “100” is input to 4. Therefore, the decoder 3 outputs the decoded signal indicating the numerical value "1", and the decoder 4 outputs the decoded signal indicating the numerical value "4". As a result, in step 19, the left detected numerical value L of the numerical value "1" and the reference numerical value B of the numerical value "2".
And the right detection value R of the value "4" are compared and L <B <R
If it is determined that L <B <R, the process proceeds to step 20, and the voice direction plates 8L, 8
A signal for directing R forward is output. Then, by the operation of the driving means 2, the sound directing plates 8L and 8R are directed forward. Therefore, the upper part of the seat back 22 is rear,
Even if the upper part of the seat back 23 is located forward, the listener 15 sitting on the right front seat 21 can listen to music or the like having a sound field balanced.

In the above-described embodiment, the case where the listener sits on the right front seat has been described. However, in the case of an outside car, it may be better to assume that the listener sits on the left front seat. However, the same effect can be obtained by replacing the left and right and processing. Further, in the above embodiment, the case where the seat or the seat back can be set in three steps has been described. However, not limited to this, even when the seat or the seat back can be set in a plurality of steps, each position can be set by providing a plurality of position sensors. May be detected, and the sound directing plate may be driven in a plurality of stages in accordance with these detection signals. Further, in the above embodiment, it is assumed that the seat or the seat back is manually moved, but when an automatic seat / seat back moving device or the like is equipped, a mechanism for detecting the position of the seat or the seat back, etc. The signal from the position sensor may be used as the signal of the position sensor. Also,
In the above-described embodiment, the case where only the rear speaker is controlled by the sound directing plate has been described, but in another embodiment, the front speaker may be controlled by the sound directing plate together.

[0031]

As described above, according to the vehicle interior sound field automatic correction system of the present invention, the seat position detecting means for detecting the upper position of the seat back of the left and right front seats, and at least the both side surfaces of the rear part of the passenger compartment are provided. Since the audio directing plate for controlling the audio output direction of the speaker and the driving means for driving the audio directing plate based on the detection signal of the seat position detecting means are provided, the upper position of the seat back is detected. The voice directing plate can be driven according to the upper position of the seat back. As a result, the directional characteristics of the voice output of the speaker can be automatically corrected, so that the listener sitting on the seat can always listen to music in a well-balanced sound field.

Further, in the vehicle interior sound field automatic correction system according to the present invention, the seat position detecting means detects a deviation in relative position between the seat back upper part of the left front seat and the seat back upper part of the right front seat. Therefore, the sound directing plate can be driven in consideration of the influence of the seat back of the left front seat, and the directivity characteristic of the sound output of the speaker can be automatically corrected to a more appropriate one.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a vehicle interior sound field automatic correction system according to the present invention.

FIG. 2 is a plan view of the passenger compartment for explaining the operation when the seat backs of the left and right front seats are in the standard position in the embodiment.

FIG. 3 is a plan view of the passenger compartment for explaining the operation when the seat back of the right front seat is in front of the standard position in the embodiment.

FIG. 4 is a plan view of the passenger compartment for explaining the operation when the seat back of the right front seat is behind the standard position in the embodiment.

FIG. 5 is a front cross-sectional view showing the vicinity of the voice directing plate in the embodiment.

FIG. 6 is a schematic plan view of the sound directing plate in FIG. 5 and its vicinity as seen from above.

FIG. 7 is a diagram showing a cover of a voice directional plate in the embodiment.

FIG. 8 is a flowchart for explaining the operation of the vehicle interior sound field automatic correction system according to the embodiment.

FIG. 9 is a plan view of the interior of the vehicle showing the arrangement of seats, speakers, etc. for explaining the problems in the conventional technique.

[Explanation of symbols]

 1 Seat Position Detection Means 2 Driving Means 8L Left Audio Directional Plate 8R Right Audio Directional Plate 11 Rear Left Speaker 12 Rear Right Speaker 16 Car Interior 17 Car Interior Side 19 Audio System Main Body 20 Left Front Seat 21 Right Front Seat 22 Left Front Seat Back 23 Seat back of the right front seat

Claims (2)

[Claims] 1. An automatic vehicle interior sound field correction system for automatically correcting a sound field of an audio system, which is mounted in a vehicle interior of a vehicle and has a speaker on at least both sides of a rear part of the vehicle interior, comprising: A seat position detecting means for detecting an upper position of the seat back, a voice direction board for controlling a voice output direction of the speaker, and a driving means for driving the voice direction board based on a detection signal of the seat position detecting means. The automatic sound field correction system for the vehicle interior. 2. The automatic vehicle interior sound field according to claim 1, wherein the seat position detecting means detects a relative positional deviation between a seat back upper part of the left front seat and a seat back upper part of the right front seat. Correction system.