JPH05122799A - Acoustic reproducing device with function correcting sound field for automobile - Google Patents

Abstract

PURPOSE:To provide the required sound field by applying the output of a cancellation sound with the inverse function of the transmission function depending on the position before and after the seat to an auxiliary speaker. CONSTITUTION:A cancellation acoustic signal generation means 20 is provided with the transmission function which is the inverse function of transmission function HL1 corresponding to the position of a seat 8 of the sound field consisting of the only sound responding to the output of a detection means 36, reflecting by a right window plate 34 from a main speaker FL, and reaching the right ear ER2 of a listener on a driver's seat 8. As the speaker HR is near the ear ER2 and the front axis is inclined to the window plate 34 by the angle theta, the direct sound from the speaker HR will not be made incident to the ER2 and EL2 and the required sound field can be provided without fail. Moreover, the front axis 18 is inclined close to the window plate 34 in the HR, so the area capable of cancelling the reflection sound 17 is wide. Thus, the required sound field can be obtained by cancelling the sound 17 even when the head, ER2, and EL2 are deviated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle sound reproducing device having a sound field correcting function.

[0002]

2. Description of the Related Art A typical prior art is disclosed in Japanese Patent Application Laid-Open No. 2-7699 by the present applicant, which is shown in a simplified form in FIG. In the passenger compartment of an automobile, the direct sound DR from the main speaker 1 is incident on the right ear ER of a listener 2 such as a driver. The sound RR reflected on the inner wall 3 such as the window glass along the path indicated by the broken line from the speaker 1 also enters the right ear ER. An auxiliary speaker 4 is provided on the headrest of the listener 2, and the direct sound HRa incident on the right ear ER from the auxiliary speaker 4 is in opposite phase at the same sound pressure level as the reflected sound RR and interferes with each other. To do. In this way, the reflected sound RR is canceled and canceled by the direct sound HRa from the auxiliary speaker 4. The auxiliary speaker 5 directed to the left ear EL of the listener 2 also has the left ear EL.
Generates a sound that cancels the reflected sound incident on.

[0003]

In the prior art shown in FIG. 8 as described above, since the auxiliary speakers 4 and 5 are directed to the listener 2 side, the sound from the right auxiliary speaker 4 is heard by the listener 2. There is a problem that the sound from the left auxiliary speaker 5 reaches the left ear EL, and the sound from the left auxiliary speaker 5 reaches the right ear ER of the listener 2, so that the desired sound field cannot be obtained accurately.

Further, in this prior art, the reflected sound RR and the direct sound HRa from the auxiliary speaker 4 interfere with each other and the reflected sound RR is canceled out in a small region, and therefore the right ear ER.
And even if the position of the listener 2 is slightly displaced, it becomes impossible to cancel the reflected sound RR by the direct sound HRa of the auxiliary speaker 4. This also applies to the other auxiliary speaker 5.

It is an object of the present invention to reproduce a sound with a sound field correction function for an automobile, which can surely cancel the reflected sound and can widen the area where the reflected sound can be canceled. It is to provide a device.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a main speaker, a detecting means for detecting the position of a movable seat of a listener in the interior of an automobile, and a response from the output of the detecting means to the vehicle from the main speaker. Having a transfer function that is an inverse function of the transfer function corresponding to the seat position of the sound field that is composed only of the sound reflected by the inner wall of the room and propagating to the ear of the listener on the inner wall side of the seat,
A canceling sound signal generating means for inputting a sound signal to be given to the main speaker and an output from the canceling sound signal generating means are provided near the ear of the listener of the seat, and the front axis is inclined toward the inner wall. A sound reproducing device having a sound field correction function for an automobile, comprising:

The present invention also provides a left main speaker, which is provided to the left of the front of a movable seat of a listener in the passenger compartment of an automobile, to which a left acoustic signal is given, and a right speaker which is provided to the front and right of the seat. The right main speaker to which the acoustic signal of is given, the left auxiliary speaker provided near the seat on the left side, the front auxiliary axis inclined toward the left inner wall, and the right auxiliary speaker provided near the seat,
A right auxiliary speaker with the front axis inclined toward the right inner wall,
A sound field composed of only the detection means for detecting the position of the seat and the sound that responds to the output of the detection means and that is reflected from the right main speaker by the inner wall on the left side and propagates to the left ear of the listener of the seat. An output of the first canceling acoustic signal generating means, which has a transfer function that is an inverse function of the transfer function corresponding to the seat position, receives the right acoustic signal, and gives the output to the left auxiliary speaker, and the detecting means. In response to the seat position of the sound field consisting of only the sound reflected from the left main speaker and reflected by the inner wall on the right side and propagating to the right ear of the listener in the seat. A sound reproducing device having a sound field correcting function for an automobile, comprising a second canceling sound signal generating means having a function, to which a left sound signal is input and which provides an output to a right auxiliary speaker. is there.

Further, the present invention is provided on the front left side of the movable seat of the listener in the passenger compartment of the automobile, the left main speaker to which the left acoustic signal is given, and on the front right side of the seat, A right main speaker to which a right acoustic signal is given, a left auxiliary speaker provided to the left near the seat and a left acoustic signal, and a right auxiliary speaker to the right near the seat to give a right acoustic signal The right auxiliary speaker, the detection means for detecting the position of the seat, and the sound that responds to the output of the detection means and is reflected from the right main speaker by the inner wall on the left side and propagates to the left ear of the listener in the seat. A first cancellation acoustic signal having a transfer function which is an inverse function of a transfer function corresponding to the seat position of the configured sound field, to which a right acoustic signal is input and an output is given in addition to the left auxiliary speaker. In response to the output of the generating means and the detecting means, A transfer function that is an inverse function of a transfer function corresponding to the seat position of a sound field composed of only the sound reflected from the main speaker on the inner wall on the right side and propagating to the ear on the right side of the listener of the seat, the left side Sound signal is input and output is
A sound reproducing device having a sound field correcting function for an automobile, characterized in that the sound reproducing device includes a second canceling sound signal generating means to be applied in addition to the right auxiliary speaker.

Further, the present invention provides a left main speaker, which is provided to the front left of the movable seat of the listener in the passenger compartment of the automobile, to which a left acoustic signal is given, and a front right of the seat, and a right main speaker. In response to the output of the right main speaker to which the sound signal of the, the detection means for detecting the position of the seat, and the detection means,
It has a transfer function which is an inverse function of the transfer function corresponding to the seat position of the sound field composed of only the sound reflected from the right main speaker on the inner wall on the left side and propagating to the left ear of the listener in the seat. , In response to the output of the first canceling acoustic signal generating means for giving the right acoustic signal and giving the output to the left main speaker and the detecting means, and reflecting from the left main speaker on the right inner wall. Having a transfer function that is the inverse function of the transfer function corresponding to the seat position of the sound field consisting only of the sound propagating to the right ear of the listener of the seat, the left acoustic signal is input, the output, A sound reproducing device having a sound field correcting function for an automobile, characterized in that the sound reproducing device includes a second canceling sound signal generating means provided in addition to the right main speaker.

[0010]

According to the present invention, the auxiliary speaker is provided in the vicinity of the listener's ear in the seat, and the front axis is inclined toward the inner wall. The acoustic signal to be given to the main speaker is input to the canceling acoustic signal generating means having a transfer function which is an inverse function of the transfer function corresponding to the seat position of the sound field composed of only the sound propagating to the ear on the inner wall side of the person. The output from the canceling acoustic signal generating means obtained at this time is given, so that the sound output from the auxiliary speaker can cancel the sound by the main speaker reflected from the vehicle interior wall. The seat is provided in the passenger compartment of the automobile so as to be movable back and forth, and a listener sits in the seat. When the seat moves back and forth and is adjusted and set, the path from the main speaker to the interior wall of the vehicle such as window glass may be cut off by the body of the listener seated in the seat, especially the head. Yes,
Thus, the transfer function of the sound field changes depending on the position of the seat. In the present invention, the reflected sound is canceled regardless of such a change in the transfer function of the sound field in the listener, and the adverse effect of the reflected sound is prevented.

In this way, it is possible to prevent a direct sound from an auxiliary speaker provided near the right ear of the listener from entering the left ear which is the opposite side of the listener, or near the left ear of the listener. It is possible to prevent a direct sound from the auxiliary speaker provided in the above from entering the right ear of the listener and obtain a desired sound field.

Further, according to the present invention, the front axis of the auxiliary speaker is inclined toward the inner wall, and the front axis is not set toward the listener's ear. It is possible to widen the canceling area of the reflected sound. Therefore, even if the position of the listener's head, that is, the position of the ear shifts, the reflected sound can be reliably canceled by the auxiliary speaker, and the region in which the desired sound field can be obtained can be widened.

Further, according to the present invention, main speakers are provided on the front left and right of a seat such as a driver's seat and / or a passenger's seat of an automobile, and auxiliary speakers are provided on the left and right in the vicinity of the seat. The left and right auxiliary speakers have front axes inclined toward the inner wall such as the left and right window glass, and the seat position is detected by the detecting means, and the first and the first responding to the output of the detecting means. The right and left acoustic signals are input to the two-cancellation acoustic signal generating means, each output is given to the left and right auxiliary speakers, and the transfer functions of these first and second cancellation acoustic signal generating means are , A transmission corresponding to the position of the seat in each sound field consisting of only the sound that is reflected from the right and left main speakers on the left and right inner walls and propagates to the left and right ears of the listener of the seat. Is the inverse function of the function will this by acoustic reflected sound from the right and left main speaker by each inner wall of the left and right are canceled respectively left and right auxiliary speakers.

Further, according to the present invention, the left and right auxiliary speakers are provided with the left and right acoustic signals to be provided to the left and right main speakers, respectively, to form a sound field. In this case, the front axis of the auxiliary speaker may not be directed toward the inner wall, and the auxiliary speaker may be provided near the seat.

Further, according to the present invention, the auxiliary speakers are omitted, and the outputs obtained from the first and second canceling acoustic signal generating means are provided in addition to the above-mentioned left and right auxiliary speakers, respectively. You may make it give in addition to each speaker.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a simplified system diagram showing the overall construction of an embodiment of the present invention. The passenger compartment 7 of the automobile 6 is provided with seats 8 and 9 as seats which are a driver's seat and a passenger seat, and main speakers FL and FR are attached to the front left and right thereof, respectively. To these main speakers FL and FR, a left acoustic signal is supplied from the acoustic signal generation source 10 via a line 11, a right acoustic signal is supplied via a line 12, and further amplification circuits 13 and 14. The headrests 8a and 9a of the seats 8 and 9 have auxiliary speakers HR and HL.
Are provided respectively. The seats 8 and 9 can be moved back and forth (vertical direction in FIG. 1) manually or by a motor or the like, and can be adjusted and set at desired positions.

FIG. 2 is an enlarged plan view of the vicinity of the seat 8. Window plates 33 and 34, which are left and right window glasses that are inner walls, are provided on a side portion of the automobile 6 that forms the passenger compartment 7. The sound from the left main speaker FL is propagated to the window plate 34 on the right side provided on the door of the vehicle body 6 as indicated by reference numeral 16, and is reflected by the window plate 34 as indicated by reference numeral 17. The light enters the right ear ER2 of the driver who is the listener sitting on the seat 8. In order to cancel the reflected sound 17, the front speaker 18 of the auxiliary speaker HR is inclined toward the window plate 34, and an angle θ is formed with respect to the front direction 19 of the sound field.
Have. This angle θ is selected, for example, as shown in the equation 1.

[0018]

[Formula 1] 0 ° ≤ θ ≤ 45 ° If the angle θ is set too large, the sound from the auxiliary speaker HR may be reflected by the window plate 34 and the reflected sound may enter the right ear ER2. θ is selected as in Equation 1 so that the sound reflected by the window plate 34 from the auxiliary speaker HR does not enter the right ear ER2. Auxiliary speaker H provided on the headrest 9a of the passenger seat 9
The R is also provided symmetrically with the auxiliary speaker HR, and the window plate 3
The reflected sound of the sound from the main speaker FR by 3 is canceled out.

The left acoustic signal is output from the line 11 through the second canceling acoustic signal generating means 20 and the output thereof is the amplifying circuit 2.
It is amplified by 1 and given to the right auxiliary speaker HR. The right acoustic signal is given from the line 12 to another first canceling acoustic signal generating means 22, the output of which is amplified by the amplifying circuit 23 and given to the left auxiliary speaker HL.

Referring to FIG. 3, the direct sound from the left main speaker FL is shown in the left ear EL2 of the listener in the driver's seat 8 as shown by the reference numeral 24 in FIG. It is incident at the sound pressure level. The direct sound from the left main speaker FL is also incident on the right ear ER2 of the listener as shown by the small sound pressure level 25 in FIG. 3 (2). Further, the direct sound 16 from the left main speaker FL is reflected by the window plate 34, and the reflected sound 17 is incident on the right ear ER2 as shown by the sound pressure level 26 in FIG. 3 (2). In this embodiment, in order to cancel such a sound of the reflected sound 17, the second canceling sound signal generating means 20 is reflected by the window plate 34 from the left main speaker FL and is reflected by the window plate 34 of the driver's seat 8.
It has a transfer function that is the inverse function 1 / HL1 of the transfer function HL1 of the sound field that is composed only of the sounds 16 and 17 that propagate to the right ear ER2 of the listener on the side. With this, the auxiliary speaker HR
The sound from cancels the reflected sound 17 and thus the right ear E
The reflected wave 17 is prevented from entering the R. The configuration for this will be further described with reference to FIGS. 4 and 5.

FIG. 4 is a simplified view showing the structure of the second detecting means 36 provided in association with the seat 8. A listener 61 who is a driver is seated in the seat 8. The seat 8 is provided with a backrest portion 62 and a headrest 63, and the headrest 63 has the above-described auxiliary speaker H.
R is attached. The front and rear positions of the seat 8 (the up-down direction in FIG. 1 and the left-right direction in FIG. 4) are detected by the second detection means 36.

FIG. 5 is an electric circuit diagram showing a specific structure of the second detecting means 36. A resistor 39 is provided along the movement path before and after the seat 8, and the front and rear ends 40 and 41 of the resistor 39 are set to one potential + Vcc and the ground potential. A contact piece 42 is attached to the seat 8, and the contact piece 42 contacts the resistor 39 and slides. Therefore, the voltage derived from the line 43 of the contact piece 42 represents the front and rear positions of the seat 8. The other seat 9 and the first detection means 35 are also similarly configured,
A signal representing the position of the seat 9 is derived from the line 44 and is given to the first cancellation acoustic signal generating means 22.

The second canceling acoustic signal generating means 20 has a second
In response to the output of the detection means 36, a sound field composed of only the sound reflected from the left main speaker FL by the right window plate 34 and propagating to the right ear ER2 of the listener who is the driver of the driver's seat 8. Has a transfer function which is an inverse function 1 / HL1 of the transfer function HL1 corresponding to the position of the seat 8. A left acoustic signal from the line 11 is input to the second canceling acoustic signal generating means 20, and the output thereof is given to the right auxiliary speaker HR via the amplifier circuit 21.

The auxiliary speaker HR is provided in the vicinity of the right ear ER2 on the side of the window plate 34 of the listener, and since the front axis is inclined toward the window plate 34 by the angle θ, the auxiliary speaker HR is directly connected to the auxiliary speaker HR. Sound is prevented from entering the right ear ER2 and the left ear EL2, which ensures that the desired sound field is obtained. Moreover, this auxiliary speaker HR
As described above, the front shaft 18 is inclined toward the window plate 34 as described above, and therefore, the area where the reflected sound 17 can be canceled is wide. Therefore, the listener's head and ears ER2, EL
Even if the position of 2 is displaced, the reflected sound 17 can be reliably canceled and the desired sound field can be obtained. This also applies to listeners in the passenger seat 9. The first canceling acoustic signal generating means 22 is reflected by the window plate 33 opened / closed from the main speaker FR and reflected on the window plate 33 side of the passenger seat 9 on the left ear E of the listener.
It has a transfer function which is the inverse function 1 / HR1 of the transfer function HR1 corresponding to the position of the seat 9 in the sound field composed of only the sound propagating to R1. That is, the first canceling acoustic signal generating means 22 responds to the output of the first detecting means 35, reflects from the right main speaker FR by the window plate 33 on the left side, and is the listener of the assistant at the listening position which is the passenger seat 9. Has a transfer function which is the inverse function 1 / HR1 of the transfer function HR1 corresponding to the position of the seat 9 in the sound field composed only of the sound propagated to the left ear ER1. The right canceling sound signal from the line 12 is inputted to the first canceling sound signal generating means 22, and its output is given to the left auxiliary speaker HL via the amplifier circuit 23. The sound 27 from the right main speaker FR is reflected by the window plate 33, and the reflected sound 29 is the sound 3 from the left auxiliary speaker HL.
Canceled by 0.

As another embodiment of the present invention, the main speaker F
L and auxiliary speaker HR and their associated amplifier circuit 1
3, 21 and one of the cancellation sound signal generating means 20 are provided, and even when the main speaker FR and the auxiliary speaker HL are omitted, the adverse effect of the reflected sound 17 can be prevented, and the present invention is implemented. be able to.

Although the driver's seat 8 and the passenger's seat 9 are provided in the above-described embodiment, only the driver's seat 8 is provided as another embodiment of the present invention, and the auxiliary speakers HR and HL are respectively provided on the headrest 8a. It may be provided, and the present invention is similarly implemented at this time.

FIG. 6 is a system diagram showing the overall construction of another embodiment of the present invention. This embodiment is similar to the previous embodiment, and corresponding parts bear the same reference numerals. Particularly in this embodiment, the left and right sides of the automobile 6 are directed toward the vehicle compartment 7,
Auxiliary speakers HL and HR are provided respectively. The auxiliary speakers HL and HR are arranged in the vicinity of the listening positions which are the passenger seat 9 and the driver's seat 8, and in this embodiment, they are arranged slightly behind the seats 9 and 8 to directly hear the sound EL.
1 and ER2, respectively, to improve the effect of the sound field in each of the seats 9 and 8, and also to improve the effect of the sound field in the rear seat behind the seats 9 and 8. In relation to the left and right seats 9 and 8, the first and second detection means 35 and 36 are provided as in the above-mentioned embodiment, and the outputs of these first and second detection means 35 and 36 are provided via the lines 44 and 43, respectively. The two-cancellation acoustic signal generating means 22 and 20 are respectively provided, and their transfer functions are changed in the same manner as in the above-mentioned embodiment.

The right acoustic signal on the line 12 is added to the adding circuit 47.
Is applied to one input and the output is applied to the amplifier circuit 21. The second canceling sound signal generating means 20 is supplied with the left sound signal from the line 11, and its output is supplied to the other input of the adding circuit 47 and added to the right sound signal. Similarly, the left acoustic signal on the line 11 is given to one input of the adding circuit 48, and the addition output thereof is given to the amplifying circuit 23. The right acoustic signal from the line 12 is applied to the first cancellation acoustic signal generating means 22 and its output is applied to the other input of the adder circuit 48, so that its output is added to the left acoustic signal.

Thus, the sound from the auxiliary speaker HL is
The sound from the right main speaker FR is reflected by the window plate 33 on the left side and cancels the reflected sound incident on the left ear EL1 of the listener in the passenger seat 9. Similarly, the sound from the right auxiliary speaker HR cancels the reflected sound reflected from the left main speaker FL to the window plate 34 and incident on the right ear ER2 of the listener at the driver's seat 8. Further, according to such an embodiment, even if the positions of the listener's head, and thus the ears, in the driver's seat 8 and the passenger's seat 9 are changed, the reflected sound is canceled out in a relatively wide area, so that the desired sound field is obtained. It is possible to listen at.

FIG. 7 is a system diagram showing the overall construction of still another embodiment of the present invention. This embodiment is similar to the previous embodiment, and the corresponding parts bear the same reference numerals. It should be noted that, in this embodiment, the auxiliary speakers HR and HL in the above-described embodiment are omitted, and the acoustic signal for canceling the reflected sound is added to the signals given to the left and right main speakers FL and FR.

The left main speaker FL is supplied with the left acoustic signal from the line 11 via the amplifier circuit 13, and the right acoustic signal from the line 12 is passed through the first canceling acoustic signal generating means 22 to the amplifier circuit 23. From the line 53, and the acoustic signal added in the adding circuit 51 in this way is given to the left main speaker FL. The output of the first detecting means 35 is given to the first canceling acoustic signal generating means 22. The transfer function of the first canceling acoustic signal generating means 22 responds to the output of the first detecting means 35, reflects from the right main speaker FR on the left window plate 33, and is on the left side of the listener in the passenger seat 9. It is the inverse function 1 / HR1 of the inverse function HR1 of the transfer function HR1 corresponding to the position of the seat 9 in the sound field composed of only the sound propagating to the ear EL1.

Similarly, to the right main speaker FR, the right sound signal from the line 12 is amplified by the amplifier circuit 14 and given to one input of the adder circuit 52. The left acoustic signal from the line 11 is the second canceling acoustic signal generating means 2
It is supplied from the amplifier circuit 21 to the other input of the adder circuit 52 via 0. The output of the adding circuit 52 is the right speaker FR.
Given to. The transfer function of the second canceling acoustic signal generating means 20 responds to the output from the second detecting means 36 through the line 43, and the main speaker FL on the left side to the window plate 34 on the right side.
The ear E on the right side of the listener who is the driver in the driver's seat 8 reflected by
It has a transfer function which is the inverse function 1 / HL1 of the transfer function HL1 corresponding to the position of the seat 8 in the sound field composed of only the sound propagating to R2. Thus the driver's seat 8 and the passenger seat 9
The listener in can listen to the acoustic signal in a desired sound field without being adversely affected by the reflected sound.

[0033]

As described above, according to the present invention, the auxiliary speaker is provided near the ear on the inner wall side such as the window plate of the listener in the movable seat of the automobile, and the front axis of the auxiliary speaker is set to the inner wall. The auxiliary speaker has a transfer function of the sound field corresponding to the position of the seat, which is composed of only the sound reflected from the main speaker on the inner wall and propagating to the listener's ear on the inner wall side of the listening position. Has a transfer function that is the inverse function of
Since the acoustic signal given to the main speaker is input, it is possible to cancel the reflected sound of the sound from the main speaker by the inner wall, and the direct sound from the auxiliary speaker can be heard only by the ear on the inner wall side. Therefore, it is possible to prevent the sound from entering the ear on the opposite side, and it is possible to always obtain a desired sound field regardless of the position of the seat. Furthermore, the front axis of this auxiliary speaker is inclined toward the inner wall as described above,
In other words, the sound that is directed toward the inner wall and cancels is generated from the auxiliary speaker, so that even if the listener's head, and hence the ears, are displaced, the reflected sound has a large area for canceling, so the desired sound It is possible to get a place.

Further, according to the present invention, main speakers are provided on the left and right sides of the front of the seat, which is a listening position such as a driver's seat and / or a passenger seat in the passenger compartment of an automobile, and auxiliary speakers are provided on the left and right in the vicinity of the seat. Are provided, the front axes of the left and right auxiliary speakers are respectively inclined toward the inner wall, and the position of the seat is detected by the detecting means, and the first and second canceling counters responding to the output of the detecting means. The right and left acoustic signals are input to the left acoustic signal generating means, and the respective outputs are given to the left and right auxiliary speakers, respectively, and the transfer functions of the first and second cancellation acoustic signal generating means are right and A transmission function corresponding to the position of the seat in each sound field consisting of only sound that is reflected from the left main speaker on the left and right inner walls and propagates to the left and right ears of the listener of the seat. Is an inverse function of, thus it is possible to cancel the reflected sound from each inner wall.

Further, according to the present invention, the auxiliary speaker is omitted, and the outputs from the first and second canceling acoustic signal generating means are applied to the respective left and right main speakers, respectively, to simplify the structure. Can be planned.

[Brief description of drawings]

FIG. 1 is a simplified system diagram showing an overall configuration of an embodiment of the present invention.

FIG. 2 is an enlarged plan view of the vicinity of a driver's seat 8.

FIG. 3 is a diagram showing a listening state of the embodiment shown in FIGS. 1 and 2;

4 is a simplified side view showing a configuration related to a seat 8 and a second detection means 36. FIG.

5 is an electric circuit diagram showing a specific configuration of second detection means 36. FIG.

FIG. 6 is a system diagram showing an overall configuration of another embodiment of the present invention.

FIG. 7 is a system diagram showing an overall configuration of still another embodiment of the present invention.

FIG. 8 is a plan view showing the prior art in a simplified manner.

[Explanation of symbols]

 6 Car 7 Cabin 8 Driver's seat 9 Passenger's seat 10 Acoustic signal source 13,14,21,23 Amplifying circuit 20,22 Canceling acoustic signal generating means 33 Left inner wall 34 Right inner wall 35,36 Detection means 47,48 , 51, 52 Adder circuit FR, FL Main speaker HR, HL Auxiliary speaker

Claims (4)

[Claims] 1. A main speaker, a detection means for detecting the position of a movable seat of a listener in a vehicle interior of a vehicle, and a seat responsive to an output of the detection means and reflected from the main speaker by an inner wall of the vehicle interior. The sound signal to be input to the main speaker has a transfer function that is an inverse function of the transfer function corresponding to the seat position of the sound field that is composed only of the sound that propagates to the ear of the listener on the inner wall side. A canceling acoustic signal generating means and an auxiliary speaker provided with an output from the canceling acoustic signal generating means, provided in the vicinity of the ear of the listener of the seat, and having a front axis inclined toward the inner wall. A sound reproduction device having a sound field correction function for an automobile. 2. A left main speaker, which is provided to the front left of a movable seat for a listener in a vehicle interior of a vehicle and is provided with a left acoustic signal, and a right main acoustic signal which is provided to the front right of the seat. Is provided to the right main speaker, the left auxiliary speaker near the seat, and the left auxiliary speaker with the front axis inclined toward the left inner wall, and the left auxiliary speaker near the seat to the right near the right front wall. In response to the output of the right auxiliary speaker with tilted axis, the detecting means for detecting the position of the seat, and the detecting means, it is reflected from the right main speaker by the inner wall on the left side and propagated to the left ear of the listener in the seat. Having a transfer function that is an inverse function of the transfer function corresponding to the seat position of the sound field composed of only the sound to be input, the right acoustic signal is input, and the output is given to the left auxiliary speaker In response to the output of the acoustic signal generation means and the detection means, Having a transfer function which is the inverse function of the transfer function corresponding to the seat position of the sound field composed of only the sound reflected from the inner wall on the right side and propagated to the right ear of the listener at the seat, The sound reproducing device having a sound field correcting function for an automobile, comprising: a second canceling sound signal generating means for inputting the sound signal of 1. and outputting the output to the right auxiliary speaker. 3. A left main speaker provided to the front left of a movable seat for a listener in a passenger compartment of an automobile to which a left acoustic signal is given, and a right main acoustic signal provided to the front right of the seat. Is provided to the right main speaker, the left auxiliary speaker is provided near the seat on the left side to provide the left acoustic signal, and the right auxiliary speaker is provided to the right near the seat to be provided with the right acoustic signal. And a sound composed of only the sound detecting means for detecting the position of the seat, and the sound responsive to the output of the sound detecting means, which is reflected from the right main speaker by the inner wall on the left and propagates to the left ear of the listener in the seat. First canceling acoustic signal generating means having a transfer function which is an inverse function of a transfer function corresponding to the seat position in the field, a right acoustic signal is inputted, and an output is given to the left auxiliary speaker in addition to the first canceling acoustic signal generating means; In response to the output of the detection means, from the left main speaker The left acoustic signal has a transfer function that is an inverse function of the transfer function corresponding to the seat position of the sound field composed of only the sound reflected by the inner wall on the right side and propagating to the right ear of the listener of the seat. Is input, and second canceling acoustic signal generating means for giving an output in addition to the right auxiliary speaker is included, and a sound reproducing device having a sound field correcting function for an automobile. 4. A left main speaker, which is provided to the front left of a movable seat of a listener in a passenger compartment of an automobile and receives a left acoustic signal, and a right sound signal which is provided to the front right of the seat. To the left main wall of the seat that is reflected by the inner wall on the left side and propagates to the left ear of the listener in response to the output of the right main speaker. A first cancellation having a transfer function which is an inverse function of a transfer function corresponding to the seat position of a sound field constituted by only the right acoustic signal is input and an output is given in addition to the left main speaker. In response to the output of the acoustic signal generating means and the detecting means, at the seat position of the sound field composed of only the sound reflected from the left main speaker by the inner wall on the right side and propagating to the right ear of the listener of the seat. Has a transfer function that is the inverse of the corresponding transfer function, Signal is input, outputs a sound reproducing apparatus having a sound automotive field correction function, characterized in that it comprises a second canceling acoustic signal generation means providing in addition to the right main speaker.