JP2001069598A - On-vehicle multi-channel audio reproduction apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a multi-channel audio reproducing apparatus that is about to become widely used as home audio systems, even to an in-cabin application. SOLUTION: This reproducing apparatus 20 is provided with an input detection means 23 that automatically detects whether an input from a sound source is a multi-channel audio input MC or a stereo/monaural input S/M and with a reproduction characteristic correction means 24, that corrects reproduction characteristic in a reproduction circuit 21 into reproduction characteristic suitable for the multi-channel audio input MC, when a multi-channel audio input MC is detected by the input detection means 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-vehicle multi-channel audio reproducing apparatus.

[0002]

2. Description of the Related Art In recent years, multi-channel audio reproducing apparatuses have become widespread. This multi-channel audio reproducing apparatus is practically used as, for example, a Dolby Digital System or DTS (Digital Theater System) of Dolby Corporation, and has a 5.1 channel speaker system.
(Channel) method is adopted. That is, front L (left), front R (right), rear L, rear R
A 5-channel speaker at the center and a speaker for a heavy bass channel as 1ch are prepared. As a multi-channel audio playback device for general consumers, a device for home audio systems for home use is currently in practical use.

FIG. 11 is a schematic view of a multi-channel audio reproducing apparatus. However, it shows a case where the present invention is applied to a practically used home audio system. In this figure,
Reference numeral 11 denotes a center speaker, and left and right front Ls.
A speaker 12 and a front R speaker 13 are provided, respectively. These speakers 11, 12 and 13 are
It is placed in front of the listener P.

On the other hand, a rear L speaker 14 and a rear R speaker 15 are provided on the left and right behind the listener P, respectively. A woofer speaker 16 for heavy bass is installed at an appropriate position for the listener P, for example, right next to the listener P in the figure, and forms 5.1 ch. In this figure, five speakers of a center speaker 11, a front L speaker 12, a rear R speaker 15 (excluding the woofer speaker 16)
These are so-called full-range speakers, each covering the entire frequency band. The above five full-range speakers including the woofer speaker are placed at the same distance (phase) from the listener P. These five full-range speakers have substantially the same frequency characteristics. As the audio source (sound source), individual sources are prepared for, for example, 6 tracks for each 5.1ch.

[0005]

The above-mentioned multi-channel audio reproducing apparatus is an apparatus which is put to practical use as a home audio system. On the other hand, there is a vehicle audio system as a system corresponding to the home audio system. As is well known, this vehicle-mounted audio system is a so-called 4-channel system in which a front L speaker and a front R speaker are located at the front, and a rear L speaker and a rear R speaker are located at the back. However, a woofer speaker or a center speaker may be installed only as a part of a high-end audio system.

[0006] Further, when looking specifically at the above-mentioned loudspeaker for use in a vehicle, usually, a front L speaker and a front R speaker function as main speakers, and the rear R speaker and the rear L speaker produce a surround effect (realism). Alternatively, it functions as a support speaker to cover a frequency band that cannot be reproduced by the front L / R speakers or to enhance the sound field and the sense of localization, and all the speaker groups become main speakers as in a home audio system. Is different.

[0007] Further, unlike the case of the home audio system, not all speakers of the vehicle-mounted speakers are placed at the same distance from the listener (occupant in the vehicle compartment). As described above, the on-vehicle audio system has a completely different system configuration from the home audio system when a multi-channel audio playback device is applied. Therefore, if the multi-channel audio reproducing apparatus is applied to the in-vehicle audio system as it is, there is a problem that it is not possible to obtain an excellent audio effect inherent in the multi-channel audio.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle-mounted multi-channel audio reproducing apparatus capable of exhibiting the effects of multi-channel audio even in a vehicle-mounted audio system.

[0009]

FIG. 1 is a diagram showing the basic configuration of an in-vehicle multi-channel audio reproducing apparatus according to the present invention. In this figure, 21 is a reproduction circuit, 22 is a plurality of speakers, 23 is input detection means, and 24 is reproduction characteristic correction means.

The apparatus according to the present invention basically comprises a reproducing circuit 21 for reproducing an input from a sound source,
A multi-channel audio reproduction apparatus 20 for a vehicle having a plurality of speakers 22 (12, 13, 14, 15 and the like) for receiving a reproduction signal from and generating an audio output. Here, the features of the present invention are as follows: input detecting means 23 for automatically detecting whether the input from the sound source is a multi-channel audio input MC or stereo / mono input S / M; When the multi-channel audio input M is detected, the reproduction characteristic of the reproduction circuit 21 is detected.
Reproduction characteristic correction means 24 for correcting reproduction characteristics suitable for C
And that it comprises:

The input detecting means 23 detects whether a multi-channel audio input MC or a stereo / mono input S / M is provided from a sound source. If the signal line to which the input MC is applied is different from the signal line to which the input S / M is applied, the MC or S / M is automatically determined by checking which signal line has an input. Which input is given can be detected.

On the other hand, looking at the reproduction characteristic correcting means 24, the means 24 individually corrects the reproduction characteristics of the circuit system corresponding to each speaker in the reproduction circuit 21. With this correction, although the audio system in the vehicle compartment is completely different from the home audio system shown in FIG.
An audio system using a multi-channel audio playback device can be constructed in a vehicle cabin.

The objects to be corrected are, for example, equalizer characteristics, delay (phase) characteristics, frequency characteristics, and the amount of mixing between other channel signals. This correction is preferably performed automatically using a microcomputer, but can also be performed manually (manually) according to the listener's preference. For this reason, as shown in FIG. 1, the reproduction characteristic correction means 24 may include a setting switch (SW) 25 for manually specifying the reproduction characteristic.

Thus, the effect of the multi-channel audio can be exhibited also in a vehicle-mounted audio system.

[0015]

FIG. 2 is a diagram showing a specific example of the basic configuration shown in FIG. Note that the same components are denoted by the same reference numerals or symbols throughout the drawings. In FIG. 2, an in-vehicle multi-channel audio reproducing device 20
Is the stereo / monaural input S at the signal input unit 31
/ M and the multi-channel audio input MC are received and applied to the reproduction circuit 21. The signal input unit 31 has a function of the input detection unit 23 (FIG. 1).

In this input detecting means 23, S / M or MC
Is detected, the detection signal Sd (detect) is given to the microcomputer 32 constituting the reproduction characteristic correcting means 24. When the input MC is given, the microcomputer 32 outputs various reproduction characteristic correction means Sc (correct). On the other hand, the reproduction circuit 21 includes a plurality of speakers 22 (12 in FIG. 11,
13, 14, 15 and the like), and a circuit system is independently formed for each system connected to each of the systems, and each circuit system includes an equalizer (EQ) 33, a delay circuit 34, a gain control amplifier 35, and a main amplifier 36. Is provided.

A feature of the present invention is that when a multi-channel audio input MC is supplied, the equalizer characteristics of the equalizer 33, the delay characteristics of the delay circuit 34, the gain characteristics of the gain control amplifier 35, etc. The correction is performed in accordance with the characteristic correction signal Sc, whereby a multi-channel audio effect can be created in the vehicle interior.

The reproduction characteristic correction signal Sc is, for example, a DSP which forms the above-mentioned circuit elements (33, 34, 35).
The control coefficient is set in advance by the device maker and stored in a ROM (not shown) in the microcomputer 32. Alternatively, the listener P can arbitrarily set the coefficient from the outside to the microcomputer 32 via the setting switch 25 according to his / her preference.

Next, a preferred embodiment of the present invention will be described. Before that, an example of the arrangement of speakers in a vehicle compartment is illustrated and shown. FIG. 3 is a diagram showing an arrangement of a plurality of speakers in a vehicle cabin. In this figure, 41 is a front center speaker, 42 is a front L (left) speaker, 43 is a front R (right) speaker, 44 is a rear door L speaker, 45 is a rear door R speaker, and 46 is a rear L (or rear surround L). A speaker 47 is a rear R (or rear surround R) speaker, and 48 is a rear center (or rear woofer) speaker. In addition, left tweeter 4
9 or a right tweeter 49 'may be provided.

FIG. 4 is a diagram showing a first embodiment of the present invention. In the first embodiment, a plurality of speakers 22 are connected to a front speaker 22f and a rear speaker 22f in a vehicle cabin.
r, the reproduction characteristic correcting means 24 is characterized in that at least the reproduction characteristic for the reproduction signal to the rear speaker 22r is corrected. The front speaker 22f corresponds to the speakers 42 and 43 in FIG. 3, and the rear speaker 22r corresponds to the speakers 44 and 45 or the speakers 46 and 47 in FIG.

In a car audio system, the front speaker 22f is generally a main speaker, and the rear speaker 22r is a sub speaker supporting the main speaker. However, under multi-channel audio, each speaker basically plays a role as a main speaker. Then, if the reproduction characteristics of the rear speaker 22r, which is the sub speaker, are corrected, and the rear speaker 22r also functions as the main speaker, the effect of multi-channel audio can be obtained. This is the concept of the first embodiment. In this case, it is not prohibited to slightly apply the correction of the reproduction characteristic to the front speaker 22f, and such a correction may be added to the front speaker according to the listener's preference.

FIG. 5 is a diagram showing a second embodiment of the present invention. In the second embodiment, the plurality of speakers 22 include a center speaker 41 (see FIG. 3) installed at a center in a vehicle compartment. And a multi-channel audio input M
When C is given, only the center audio input in the multi-channel audio input MC is guided to the center speaker 41, and the reproduction characteristic correction means 24 corrects the reproduction characteristic of the center audio input. It is a feature.

In the case where a center speaker 41 is included in an ordinary in-vehicle audio system, it has been practiced that the center speaker 41 is combined with signals of both left and right channels in stereo input.
However, since the multi-channel audio input MC includes a center audio input dedicated to the center speaker, if this can be directly input to the center speaker 41, the signals of both the left and right channels are synthesized as described above. It is not necessary to simulate a center audio input.

Specifically, for example, the center /
A stereo switching section 51 is provided, which is used for reproducing characteristic correction means 2.
4 is controlled. During reception of the stereo / monaural input S / M, the switching unit 51 combines the signals of both the left and right channels and outputs the combined signal to the center speaker 41 (as before). On the other hand, when receiving the multi-channel audio input MC, the switching section 51 outputs the center audio input in the input MC to the center speaker 41 as it is.

FIG. 6 is a diagram showing a third embodiment of the present invention. In the third embodiment, a plurality of speakers 22 are mounted on a center speaker 4 installed at a front center in a vehicle interior.
1 and a front L speaker 42 and a front R speaker 43 installed on the front left and right sides of the vehicle interior. Then, when the multi-channel audio input MC is given, the reproduction characteristic correcting means 24 allocates the low-frequency component of the center audio input in the multi-channel audio input MC to the front L and front R speakers 42 and 43. It is a feature.

In a case where a center speaker 41 is included in a normal car audio system, the center speaker 41 generally has a small diameter in many cases. Then,
Even if the center audio input in the multi-channel audio input MC is given in a wide band, especially the low-frequency component cannot be reproduced by the center speaker 41. This does not fully take advantage of the characteristics of multi-channel audio.

Therefore, in the third embodiment, the reproduction characteristic correction means 24 activates the constituent elements 52 to 56 shown in FIG. The center audio input in the multi-channel audio input MC is a low-pass filter (LPF) 5
2 and a high-pass filter (HPF) 53. The low-frequency component of the center audio input that has passed through this low-pass filter 52 is distributed to front L and front R speakers 42 and 43 via adders 54 and 55, respectively. These speakers 42 and 4
Since No. 3 has a relatively large diameter, its low-frequency component can be sufficiently reproduced. Note that these speakers 42 and 43
The gain controller 5 synthesizes the low-frequency component at an appropriate level with respect to the original front L audio input and the front R audio input to be respectively applied to the gain controller 5.
6 are provided.

On the other hand, a high-frequency component of the center audio input is extracted by a high-pass filter 53 and applied to the small-diameter center speaker 41. FIG. 7 is a diagram showing a fourth embodiment of the present invention. In the fourth embodiment, a plurality of speakers 22 are provided with a woofer speaker 48 installed at a rear center in a vehicle interior, a rear L speaker 46 and a rear R speaker 4 installed at the rear left and right sides of the vehicle interior.
7 inclusive. And multi-channel audio input MC
Is given, the reproduction characteristic correcting means 24 adds the low-frequency components of the rear L and rear R audio inputs in the multi-channel audio input MC to the woofer speaker 48.

In an ordinary on-vehicle audio system, a woofer speaker 48 may be installed at, for example, a rear center in addition to the rear L and rear R speakers 46 and 47. In such a case, the rear L and rear R speakers 46 and 47 are generally relatively small in diameter.
Then, even if the rear L and rear R audio inputs in the multi-channel audio input MC are provided in a wide band, especially the low frequency components cannot be reproduced by these speakers 46 and 47. This does not fully take advantage of the characteristics of multi-channel audio.

Therefore, in the fourth embodiment, the reproduction characteristic correcting means 24 activates the components 61 to 65 shown in FIG. The rear L and rear R audio inputs in the multi-channel audio input MC are combined by an adder 61, and only a low-frequency component in the combined signal is extracted by a low-pass filter (LPF) 62 and added to an adder 63. And MC
Of the woofer audio input inside the woofer and output to the woofer speaker 48. The woofer speaker 48 can sufficiently reproduce its low-frequency component because of its original function.

On the other hand, relatively small diameter rear L and rear R
The speakers 46 and 47 are connected to a high-pass filter (HP
F) Output the higher frequency component through 64 and 65.
FIG. 8 is a diagram showing a fifth embodiment of the present invention. In the fifth embodiment, a plurality of speakers 22 are provided with a front L speaker 42 and a front R speaker 43 installed on the front left and right in the vehicle interior, and a rear L speaker 46 and a rear L speaker 46 installed on the rear left and right in the interior of the vehicle. R speaker 47 is included. Then, when the multi-channel audio input MC is given, the reproduction characteristic correction means 24 converts the component of the woofer audio input in the multi-channel audio input MC into
At least the front L and front R speakers 42 and 43 are added.

In an ordinary vehicle-mounted audio system, a woofer speaker 48 may be installed in the rear of the vehicle cabin, but such a woofer speaker is not provided in all vehicles. On the other hand, the multi-channel audio input MC originally has a woofer audio input. In this case, the characteristics of the multi-channel audio cannot be fully utilized in a vehicle without the woofer speaker 48.

Therefore, in the fifth embodiment, the reproduction characteristic correcting means 24 activates the components 71 and 72 (and 73 and 74 if possible) and 75 and 76 shown in FIG. The woofer audio input in the multi-channel audio input MC is added to the front L and front R audio inputs in the MC via adders 71 and 72, respectively. In this case, a gain controller 75 is provided to add the woofer audio input at an appropriate level to the original front L and front R audio inputs.

In FIG. 8, the woofer audio input is
Further, they are added to the front L and front R audio inputs in the MC via adders 73 and 74, respectively. The role of the gain controller 76 at this time is the same as the role of the gain controller 75 described above. Generally, rear L and rear R speakers 46 and 4
7 have front L and front R speakers 42
And 43 are smaller than the apertures. Therefore, it is desirable that the woofer audio input mainly composed of low-frequency components be added to the front L and front R speakers 42 and 43. However, if the diameters of the rear L and rear R speakers 46 and 47 are also sufficiently large, the addition can be performed to these rear speakers (46, 47).

FIG. 9 is a diagram showing a sixth embodiment of the present invention. The sixth embodiment is different from the sixth embodiment in that a plurality of speakers 22 are provided at rear door L speakers 44 installed on the left and right of the rear door in the vehicle interior.
And a rear door R speaker 45, a rear surround L speaker 46 and a rear surround R speaker 47 installed on the left and right sides of the rear side in the vehicle compartment are further provided.
When the multi-channel audio input MC is provided, the reproduction characteristic correction means 24 transmits the rear L and rear R audio inputs in the multi-channel audio input MC from the rear door L speaker 44 and the rear door R speaker 45 to the rear surround L speaker 46. And a switch to the rear surround R speaker 47.

In an ordinary vehicle-mounted audio system, front L and R speakers 42 and 43 and rear door L and R speakers 44 and 4 shown in FIG.
There are also many system configurations that only include 5 and 5. in this case,
An occupant sitting in a front seat in the vehicle interior receives front sound from speakers 42 and 43 and a speaker 44.
And 45, the rear sound from behind can be heard, so that the desired surround environment is realized.

However, the occupant sitting in the rear seat in the vehicle compartment only hears the rear sound from the speakers 44 and 45 as a sound from the front, and is placed in an unnatural surround environment. Therefore, in the sixth embodiment, attention is paid to the rear surround L and R speakers 46 and 47. If the vehicle does not have these speakers 46 and 47, these speakers are newly installed.

The switching units 81 and 82 shown in FIG.
And switches 83 and 84 are activated. At this time, both the switches 83 and 84 are switched from off to on (the off state is a normal time, that is, a case where the sound can be naturally heard in the front seat). Then, the occupant in the rear seat can obtain the rear sound from the rear rear L and R speakers 47 and 48 at the rear, and a natural surround environment is realized.

More preferably, when the above-mentioned switching is performed, the reproduction characteristic correcting means 24 connects the front L and front R audio inputs in the multi-channel audio input MC to the rear door L44 and the rear door R, respectively.
Input is also made to the speaker 45. That is, the respective contacts of the switching units 81 and 82 are respectively switched to the upper side in the figure (the lower side in the figure is a normal position, that is, a contact position in a case where the sound can be naturally heard in the front seat).

Then, the front L and front R audio inputs in the multi-channel audio input MC correspond to the rear door L and rear door R speakers 44 and 4.
5, so that the occupants in the rear seats can obtain front sounds from the speakers 44 and 45. Thus, the occupants in the rear seats are provided with a natural surround environment in which front sounds are obtained from the speakers 44 and 45 and rear sounds are obtained from the speakers 46 and 47.

FIG. 10 shows a seventh embodiment of the present invention. In the seventh embodiment, the reproduction characteristic correcting means 24
Is characterized in that the center audio input in the multi-channel audio input MC is added to the rear door L and rear door R speakers 44 and 45. The audio input MC includes a center audio input, and a passenger in the front seat in the vehicle cabin can listen to this through the front center speaker 41.

However, a center speaker corresponding to the front center speaker 41 is not provided for a passenger in the rear seat. Therefore, the occupant in the rear seat cannot enjoy the merit while the center audio input is present in the corner MC. Of course, a center speaker on the ceiling near the rear seat occupant may be provided,
At present, such speakers are not standard equipment, and if they were to be installed, they would be very costly.

Therefore, the reproduction characteristic correcting means 24 of the seventh embodiment is used.
Activates the adders 91 and 92 and the gain controller 93 as shown in FIG. The center audio input in the multi-channel audio input MC is
Via the adders 91 and 92, the rear door L speaker 4
4 and the rear door R speaker 45. As a result, the occupants in the rear seats are provided with a sense of presence as if the center audio input was provided from an existing center speaker.

The gain controller 93 has exactly the same level adjustment role as the gain controllers 56, 75, and 76 described above. Finally, an eighth embodiment of the present invention will be described. In the eighth embodiment, when the plurality of speakers 22 include a rear surround L speaker 46 and a rear surround R speaker 47 installed on the left and right sides on the rear side in a vehicle interior, a rear surround speaker dedicated to a front occupant in the vehicle interior. And the reproduction characteristic correction means 24 generates a multi-channel audio input MC corresponding to reproduction outputs from the rear surround L and rear surround R speakers 46 and 47 and outputs the multi-channel audio input MC to the rear surround speaker dedicated to the front occupant. Things.

In a vehicle equipped with a rear surround speaker, the rear surround effect is not sufficiently given to the front occupants since the position is behind the vehicle.
Therefore, in the eighth embodiment, a rear surround speaker dedicated to the front occupant is provided so that the rear surround effect can be sufficiently given to the front occupant, and reproduced and output from the rear surround L and R speakers 46 and 47. An audio input equivalent to the multi-channel audio input is input to a rear surround speaker dedicated to the front passenger. This speaker is shown in FIG. 3 as a rear surround speaker 95 dedicated to the front passenger.

FIG. 3 shows a state in which the speaker 95 is embedded in the right seat on the front side, but the embedding position can be determined according to the listener's preference.

[0047]

As described above, according to the present invention, a multi-channel audio reproducing apparatus which is beginning to spread as a home audio system is also applied to an in-vehicle audio system while keeping the arrangement of speakers in a vehicle compartment. A possible in-vehicle multi-channel audio reproducing device can be realized.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of an in-vehicle multi-channel audio reproduction device according to the present invention.

FIG. 2 is a diagram showing a specific example of the basic configuration shown in FIG.

FIG. 3 is a diagram showing an arrangement of a plurality of speakers in a vehicle cabin.

FIG. 4 is a diagram showing a first embodiment of the present invention.

FIG. 5 is a diagram illustrating a second embodiment of the present invention.

FIG. 6 is a diagram illustrating a third embodiment of the present invention.

FIG. 7 is a diagram illustrating a fourth embodiment of the present invention.

FIG. 8 is a diagram illustrating a fifth embodiment of the present invention.

FIG. 9 is a diagram illustrating a sixth embodiment of the present invention.

FIG. 10 is a diagram illustrating a seventh embodiment of the present invention.

FIG. 11 is a schematic view of a multi-channel audio playback device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Center speaker 12 ... Front L speaker 13 ... Front R speaker 14 ... Rear L speaker 15 ... Rear R speaker 16 ... Woofer speaker 20 ... In-vehicle multi-channel audio reproduction device 21 ... Reproduction circuit 22 ... Multiple speakers 23 ... Input detection Means 24 Reproduction characteristic correction means 25 Setting switch 31 Signal input unit 32 Microcomputer 33 Equalizer (EQ) 34 Delay circuit 35 Gain control amplifier 36 Main amplifier 41 Front center speaker 42 Front L speaker 43 Front R speaker 44 Rear door L speaker 45 Rear door R speaker 46 Rear L (or rear surround L) speaker 47 Rear R (or rear surround R) speaker 48 Rear center (or rear woofer) speaker 5 ... Center / stereo switching section 95 ... front passenger dedicated rear surround speaker MC ... Multi-channel audio input S / M ... Stereo / Mono

Claims (11)

[Claims] A reproducing circuit for reproducing an input from a sound source;
An in-vehicle multi-channel audio playback device having a plurality of speakers that receive a playback signal from the playback circuit and generate an audio output, wherein an input from the sound source is a multi-channel audio input or a stereo / monaural input. Input detection means for automatically detecting; and reproduction for correcting reproduction characteristics in the reproduction circuit to reproduction characteristics suitable for the multi-channel audio input when the multi-channel audio input is detected by the input detection means. And a characteristic correcting unit. 2. The in-vehicle multi-channel audio reproducing apparatus according to claim 1, wherein said reproducing characteristic correcting means includes a setting switch for manually specifying said reproducing characteristic. 3. When the plurality of speakers include a front speaker and a rear speaker in a vehicle cabin, the reproduction characteristic correction means corrects at least reproduction characteristics for a reproduction signal to the rear speaker. 2. The in-vehicle multi-channel audio reproduction device according to 1. 4. The system according to claim 1, wherein the plurality of speakers include a center speaker installed at a center in a vehicle compartment, and when the multi-channel audio input is provided, only the center audio input in the multi-channel audio input is used. 2. The in-vehicle multi-channel audio reproduction apparatus according to claim 1, wherein the reproduction characteristic correction means corrects the reproduction characteristic of the center audio input while guiding to a center speaker. 5. The multi-channel speaker according to claim 1, wherein the plurality of speakers include a center speaker installed at a front center in a vehicle interior, front L speakers and front R speakers installed at front left and right sides of the interior of the vehicle, and the multi-channel speaker. 2. The in-vehicle multi-channel audio reproduction according to claim 1, wherein, when an audio input is provided, the reproduction characteristic correction means distributes a low-frequency component of a center audio input in the multi-channel audio input to the front L and front R speakers. apparatus. 6. The multi-channel audio system, wherein the plurality of speakers include a woofer speaker installed on a rear side in a vehicle interior, and a rear L speaker and a rear R speaker installed on the left and right sides of a rear side in the vehicle interior, and the multi-channel audio. 2. The reproduction characteristic correction means adds each low-frequency component of the rear L and rear R audio inputs in the multi-channel audio input to the woofer speaker when an input is given.
2. The in-vehicle multi-channel audio playback device according to claim 1. 7. The plurality of speakers include a front L speaker and a front R speaker installed on the front left and right sides of the vehicle interior, and a rear L speaker and a rear R speaker installed on the rear left and right sides of the vehicle interior, And when the multi-channel audio input is provided, the reproduction characteristic correction means adds components of the woofer audio input in the multi-channel audio input to at least the front L and front R speakers.
2. The in-vehicle multi-channel audio playback device according to claim 1. 8. When the plurality of speakers include a rear door L speaker and a rear door R speaker installed on the left and right of a rear door in a vehicle interior, a rear surround L speaker and a rear speaker installed on the rear left and right sides of the vehicle interior are further included. A surround R speaker is provided, and when the multi-channel audio input is provided, the reproduction characteristic correcting means converts rear L and rear R audio inputs in the multi-channel audio input from the rear door L and rear door R speakers to the rear surround. 2. The in-vehicle multi-channel audio reproducing apparatus according to claim 1, wherein the apparatus is switchable to L and rear surround R speakers. 9. The reproduction characteristic correction means, when the switching is performed, inputs the front L and front R audio inputs in the multi-channel audio input to the rear door L and the rear door R speaker, respectively. 2. The in-vehicle multi-channel audio playback device according to claim 1. 10. The in-vehicle multi-channel audio reproducing apparatus according to claim 9, wherein said reproduction characteristic correcting means adds a center audio input in said multi-channel audio input to said rear door L and rear door R speakers. 11. When the plurality of speakers include a rear surround L speaker and a rear surround R speaker installed on the left and right sides of a rear side in a vehicle interior, a rear surround speaker dedicated to a front occupant in the vehicle interior is further provided,
2. The reproduction characteristic correction unit according to claim 1, wherein the multi-channel audio input corresponding to reproduction outputs from the rear surround L and rear surround R speakers is generated and output to a rear surround speaker dedicated to the front passenger. 3. In-vehicle multi-channel audio playback device.