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DESCRIPTION JP2007288714

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DESCRIPTION JP2007288714
[Problem] When enjoying music or a movie in a rear seat independently of a front seat in a
vehicle interior, good sound reproduction can not be performed because the front and rear
voices interfere with each other. It is an object of the present invention to perform individual
sound field control in front and rear seats in a passenger compartment and to provide a good
sound reproduction system. SOLUTION: Audio signal sources 2a and 2b, power amplifiers 5a, 5b,
5c and 5d for amplifying output voltages of the audio signal sources 2a and 2b, and sound
quality before the power amplifiers 5a, 5b, 5c and 5d Sound quality control filter units 3a, 3b, 3c,
3d having at least one filter for controlling, volume control units 4a, 4b, 4c, 4d for controlling
volume to be reproduced, and speakers 6a, 6b, 6c for sound reproduction. , 6d and at least two
units, and a screen 1 having sound insulation is provided between the units. [Selected figure]
Figure 1
Sound reproduction system
[0001]
The present invention relates to a sound reproduction system capable of reproducing good sound
quality independently in front and rear seats, for example, in a vehicle interior.
[0002]
As a conventional sound reproduction system, one as shown in FIG. 6 is known.
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In FIG. 6, when enjoying different sounds in the first unit 21a and the second unit 21b in the
vehicle compartment of the vehicle 20, the passenger on the rear seat does not use the
headphones 13 or the front and back sounds do not interfere. The space is divided by the panel.
In this way, voice reproduction can be performed independently for the front and rear seats in
the vehicle compartment.
[0003]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known. JP-A-5-29862
[0004]
However, in the above-described conventional configuration, for example, when enjoying a movie
such as music or DVD in a rear seat in a vehicle interior, the driver of the front seat may feel the
sound offensive. Therefore, even when trying to reproduce different sounds in the front seat and
the rear seat, the front and back voices interfere with each other, and there is a problem that
good voice reproduction can not be performed. In addition, it is possible to reduce the
interference of the voice before and after by separating the space using the panel etc, but in a
sedan type or one box type car, mounting the panel in the vehicle compartment is a spatially
difficult task was there.
[0005]
As described above, when trying to independently audit different voices at front and rear seats,
there is a problem that good sound quality reproduction is difficult.
[0006]
The present invention solves this problem, and an object of the present invention is to provide a
good sound reproduction system independently for front and rear seats in a vehicle cabin.
[0007]
In order to solve the above-mentioned conventional problems, the sound reproduction system of
the present invention reproduces a sound quality control filter unit having an audio signal
source, a power amplifier for amplifying output voltage, and at least one filter for sound quality
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control. It comprises a sound volume control unit for controlling the sound volume, at least two
units of speakers, and a screen having sound insulation provided between the units.
[0008]
According to this configuration, good sound reproduction is performed when different sounds
are reproduced between two units.
[0009]
The sound reproduction system according to the present invention can also perform good sound
reproduction by analyzing the sound acquired by the microphone having the microphone in the
unit.
[0010]
The sound reproduction system according to the present invention provides good sound
reproduction independently in front and rear seats by absorbing and controlling the interference
of each sound when reproducing different sounds in front and rear seats, for example, in a
vehicle interior. An effect that can be achieved.
[0011]
Hereinafter, the best mode for carrying out the present invention will be described with
reference to the drawings.
[0012]
First Embodiment The invention according to the first aspect of the present invention will be
described below with reference to the first embodiment.
[0013]
FIG. 1 is a block diagram in the case where the sound reproduction system according to the first
embodiment of the present invention is applied to a one-box type vehicle interior.
[0014]
In FIG. 1, the curtain 1 having the sound insulation property is provided between the front seat
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(first seat) and the rear seat (second seat + third seat) of the vehicle 20.
The tone control filters 3a, 3b, 3c and 3d are constituted by an equalizing filter for adjusting
frequency characteristics, a low pass filter, a high pass filter and the like.
The first unit 21a includes an audio signal source 2a, sound quality control filter units 3a and 3b,
volume control units 4a and 4b, power amplifiers 5a and 5b, and speakers 6a and 6b mounted
on the door of the vehicle 20.
Similarly, the second unit 21b includes an audio signal source 2b, sound quality control filter
units 3c and 3d, volume control units 4c and 4d, power amplifiers 5c and 5d, and speakers 6c
and 6d mounted on the door of the vehicle 20. It is done.
[0015]
In the conventional system, when different sounds are reproduced by the first unit 21a and the
second unit 21b, the sounds interfere between the first unit 21a and the second unit 21b.
Therefore, a screen 1 having sound insulation is provided between the first unit 21a and the
second unit 21b, and the frequency characteristics are controlled by the sound quality control
filter units 3a, 3b, 3c, 3d, thereby causing audio interference between the units. Can be reduced.
[0016]
Since the curtain 1 having the sound insulation has flexibility, it can be opened and closed easily
in the vehicle 20, and as a feature of the sound insulation, it absorbs particularly sound in the
middle to high frequency range of 2 KHz or more, for example.
In addition to that, voice interference can be prevented by controlling the frequency
characteristics to be reproduced by the sound quality control filter units 3a, 3b, 3c, 3d, and
extremely good sound reproduction can be obtained in the front and rear seats.
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[0017]
Second Embodiment The second embodiment of the present invention will be described below
with reference to the second aspect of the present invention.
[0018]
FIG. 2 is a block diagram in the case where the sound reproduction system according to the
second embodiment of the present invention is applied to a one-box type vehicle interior.
[0019]
In FIG. 2, the same components as in FIG. 1 will be assigned the same reference numerals and
descriptions thereof will be omitted.
[0020]
In FIG. 2, the first unit 21a includes the audio signal source 2a, the sound quality control filter
units 3a and 3b, the volume control units 4a and 4b, the power amplifiers 5a and 5b, and the
speakers 6a and 6b attached to the door of the vehicle 20. Configured
Similarly, the second unit 21b includes an audio signal source 2b, sound quality control filter
units 3c, 3d, 3e, 3f, volume control units 4c, 4d, 4e, 4f, power amplifiers 5c, 5d, 5e, 5f, a vehicle
20. The speakers 6c and 6d mounted on the door of the second embodiment and the directional
speakers 7a and 7b provided under the rear seat.
[0021]
For example, sound quality control filter units 3a and 3b are performed such that individual
sound field reproduction is performed by the speakers 7a and 7b that perform bass reproduction
by transmitting vibrations directly to the body, and middle and high sound areas are reproduced
by the speakers 6a, 6b, 6c, and 6d. , 3c, 3d to control the frequency characteristics.
As a result, middle-to-high range absorption is performed by the curtain 1 having the sound
insulation property, and audio interference can be prevented by separately reproducing the bass
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by the directional speakers 7a and 7b, and the front and rear seats are extremely good. Sound
reproduction will be obtained.
[0022]
Third Exemplary Embodiment The third and fourth exemplary embodiments of the present
invention will be described with reference to the third exemplary embodiment.
[0023]
3 and 4 are block diagrams of the case where the sound reproduction system according to the
third embodiment of the present invention is applied to a one-box type vehicle interior.
[0024]
In FIG. 3 and FIG. 4, the same components as in FIG.
[0025]
In FIG. 3, signal frequency analysis units 9 a and 9 b have a function of performing frequency
analysis of audio signals.
The sound quality control units 10a and 10b have a function of dynamically controlling the
sound quality control filter unit based on the frequency analysis result of the audio signal.
The first unit 21a includes an audio signal source 2a, sound quality control filter units 3a and 3b,
volume control units 4a and 4b, power amplifiers 5a and 5b, speakers 6a and 6b mounted on the
door of the vehicle 20, microphones 8a and signals. It comprises a frequency analysis unit 9a and
a sound quality control unit 10a.
Similarly, the second unit 21b includes an audio signal source 2b, sound quality control filter
units 3c and 3d, volume control units 4c and 4d, power amplifiers 5c and 5d, speakers 6c and 6d
mounted on the door of the vehicle 20, and a microphone 8b, a signal frequency analysis unit 9b,
and a sound quality control unit 10b.
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[0026]
In FIG. 4, the signal band analysis units 11 a and 11 b have a function of dividing an audio signal
into a plurality of frequency bands and performing analysis based on the level of the bands.
The first unit 21a includes an audio signal source 2a, sound quality control filter units 3a and 3b,
volume control units 4a and 4b, power amplifiers 5a and 5b, speakers 6a and 6b mounted on the
door of the vehicle 20, microphones 8a and signals. It is comprised by the band analysis part 11a
and the sound quality control part 10a.
Similarly, the second unit 21b includes an audio signal source 2b, sound quality control filter
units 3c and 3d, volume control units 4c and 4d, power amplifiers 5c and 5d, speakers 6c and 6d
mounted on the door of the vehicle 20, and a microphone 8b, a signal band analysis unit 11b,
and a sound quality control unit 10b.
[0027]
By acquiring the sound in the vehicle 20 by the microphones 8a and 8b, the reproduced audio
signal can be acquired.
The voice acquired by this is subjected to fast Fourier transform (FFT) by the signal frequency
analysis units 9a and 9b, and analysis is performed for each frequency.
Based on the analysis result, the sound quality control units 10a and 10b determine the control
amount of the frequency characteristic performed by the sound quality control filter units 3a, 3b,
3c, and 3d.
As a result, the sound volume control filter units 3a, 3b, 3c, 3d do not have fixed values, such as
the volume of sound for each frequency, the cut-off frequency of bass, and the cut-off frequency
of middle and high sound, to the audio signal sources 2a, 2b. The optimum value can be
dynamically obtained according to the sound to be reproduced.
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[0028]
Also, by using the signal band analysis units 11a and 11b instead of the frequency analysis units
9a and 9b, for example, the frequency band of 20 Hz to 20 kHz is divided into five frequency
bands, and the average sound level in that frequency band is analyzed. The tone control units
10a and 10b can dynamically control the tone control filters 3a, 3b, 3c and 3d.
[0029]
By the above, sound interference can be prevented, and extremely good sound reproduction can
be obtained in the front and rear seats.
[0030]
Fourth Embodiment The invention according to the fifth aspect of the present invention will be
described below with reference to a fourth embodiment.
[0031]
FIG. 5 is a block diagram in the case where the sound reproduction system according to the
fourth embodiment of the present invention is applied to a one-box type vehicle interior.
[0032]
In FIG. 5, the same components as those in FIG.
[0033]
In FIG. 5, noise analysis units 12a and 12b have a function of separating the audio signal
acquired by the microphones 8a and 8b into the original audio of the audio signal sources 2a and
2b and noise.
The first unit 21a includes an audio signal source 2a, sound quality control filter units 3a and 3b,
volume control units 4a and 4b, power amplifiers 5a and 5b, speakers 6a and 6b mounted on the
door of the vehicle 20, microphones 8a and noise It comprises an analysis unit 12a and a sound
quality control unit 10a.
Similarly, the second unit 21b includes an audio signal source 2b, sound quality control filter
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units 3c and 3d, volume control units 4c and 4d, power amplifiers 5c and 5d, speakers 6c and 6d
mounted on the door of the vehicle 20, and a microphone 8b, noise analysis unit 12b, and sound
quality control unit 10b.
[0034]
By acquiring the sound in the vehicle 20 by the microphones 8a and 8b, the reproduced audio
signal can be acquired.
The acquired voice signal also includes noise, which causes an error in signal analysis.
Also, if the noise level is high, the audio interference between the first unit 21a and the second
unit 21b is also reduced by being masked by the noise.
By separating the original voice and the noise in the noise analysis units 12a and 12b and
performing signal analysis, the control amount of the frequency characteristic performed by the
sound quality control filter units 3a, 3b, 3c and 3d in the sound quality control units 10a and
10b The optimum value of can be obtained. As a result, since the control of the sound quality
control filter units 3a, 3b, 3c and 3d can be dynamically and optimally performed, extremely
good sound reproduction can be obtained in the front and rear seats.
[0035]
According to the sound reproduction system of the present invention, for example, when
different sound reproductions are performed in front and rear seats in a vehicle interior,
extremely good sound reproduction can be obtained by absorbing and controlling the
interference of the respective sounds. It is suitable for establishing a good sound reproduction
system.
[0036]
Block diagram for explaining the sound reproduction system in the first embodiment of the
present invention Block diagram for explaining the sound reproduction system in the second
embodiment of the present invention The sound reproduction system in the third embodiment of
the present invention Block diagram for describing a block diagram for explaining an audio
reproduction system according to a third embodiment of the present invention. A block diagram
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for describing an audio reproduction system according to a fourth embodiment of the present
invention. Block diagram of
Explanation of sign
[0037]
1 Screen with sound insulation 2a, 2b Audio signal sources 3a, 3b, 3c, 3d, 3e, 3f Sound quality
control filter units 4a, 4b, 4c, 4d, 4e, 4f Volume control units 5a, 5b, 5c, 5d, 5e , 5f Power
amplifier 6a, 6b, 6c, 6d Speaker 7a, 7b Directional speaker 8a, 8b Microphone 9a, 9b Signal
frequency analysis unit 10a, 10b Sound quality control unit 11a, 11b Signal band analysis unit
12a, 12b Noise analysis unit 13 Headphones 20 vehicle 21a first unit 21b second unit
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