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JPH09200899

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH09200899
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
on-vehicle stereo reproduction apparatus in the field of audio equipment, and in particular, when
the volume of the rear speaker is reduced, the volume of the low range of the front speaker is
adjusted to The present invention relates to an on-vehicle stereo reproduction apparatus with a
sound field adjustment circuit that prevents a reduction in bassiness.
[0002]
2. Description of the Related Art As shown in FIG. 2, a conventional in-vehicle stereo reproducing
apparatus has a front left speaker 1a and a front right speaker 1b, and a rear left speaker 1c and
a rear 1c on the front, rear, left and right of the vehicle interior, as shown in FIG. The right
speaker 1d is attached, and a total of four speakers are driven by the main amplifiers 2a, 2b, 2c
and 2d of the respective channels. The main amplifiers 2a, 2b, 2c and 2d are connected to the
program source 7 via the main volume adjusters 6a, 6b, 6c and 6d. In general, there are many
cases where it is advantageous for the rear speaker to be able to reproduce the low band due to
the area of the diaphragm and the cavity volume on the rear of the speaker, such as a cabinet.
There are many playback devices.
[0003]
SUMMARY OF THE INVENTION In the above-described conventional stereo reproduction
apparatus, when the volume of the rear speaker is reduced for the convenience of reproduction,
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the level of low-frequency sound which has been given emphasis on the rear speaker is reduced.
However, with the front speakers alone, there was a problem to be solved that the feeling of bass
in the vehicle interior was reduced and the power of the reproduced sound was lacking.
[0004]
Therefore, according to the present invention, in the case where the volume of the rear speaker is
reduced as described above, a circuit for correcting the low volume of the front speaker is added
in conjunction to suppress the reduction of the feeling of bass in the vehicle interior. It is an
object of the present invention to provide an on-vehicle stereo reproduction device capable of
preventing the lack of power.
[0005]
[Means for Solving the Problems] The vehicle stereo reproducing apparatus according to the
present invention for achieving the object will be described with reference to the reference
numerals used in the embodiments. In the in-vehicle stereo reproduction apparatus in which
speakers are respectively disposed on the left and right and the rear right and left, in the
amplifier circuit A and the amplifier circuit B of the front left speaker 1a and the front right
speaker 1b, low pass filters 4a and 4b and Low-pass adjustment circuits Sa and Sb, each of which
comprises a volume adjuster 5a and 5b, are provided as shunts, and the audio signal includes
original signals Eoa and Eob propagating through the main circuits Ma and Mb and the low-pass
adjustment circuits Sa and Sb. It is divided into propagating low-pass signals Ela and Elb, and
only the low-pass signals Ela and Elb are adjusted in level, and then combined by the mixing
circuits 3a and 3b and input to the main amplifiers 2a and 2b. The amplifier circuit A, the
amplifier circuit B, the amplifier circuit C of the rear left speaker 1c, and the amplifier circuit D of
the rear right speaker 1d are connected to the program source 7 through the main volume
adjusters 6a, 6b, 6c, 6d. The sub volume adjusters 5a and 5b and the rear volume main volume
adjusters 6c and 6d are interlocked with each other, and the volume of the rear left and right
speakers 1c and 1d is reduced, and the front left and right speakers 1a and 1b are connected. It
is an on-vehicle stereo reproduction device with a sound field adjustment circuit characterized in
that the level of the low range is adjusted to be relatively increased.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a vehicle-mounted stereo
reproduction apparatus according to the present invention will be described based on FIG.
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The front left speaker 1a, the front right speaker 1b, the rear left speaker 1c and the rear right
speaker 1d are attached to the front left and right and the rear left and right respectively as in
the conventional example, and main amplifiers 2a, 2b, 2c and 2d are connected respectively.
The amplification circuit A, amplification circuit B, amplification circuit C, and amplification
circuit D of each channel are connected to the program source 7 via the main volume adjusters
6a, 6b, 6c, 6d.
[0007]
The amplification circuits A and B of the front left speaker 1a and the front right speaker 1b are
main circuits Ma and Mb that directly reach the mixing circuits 3a and 3b and a low pass filter
4a at the rear stage of the main volume adjusters 6a and 6b. , 4b and sub volume adjusters 5a,
5b, and low-pass adjustment circuits Sa, Sb leading to the mixing circuits 3a, 3b are provided as
shunts and in parallel with the main circuits Ma, Mb.
Therefore, the audio signal is divided into the original signals Eoa and Eob propagating the main
circuits Ma and Mb and the low band signals Ela and Elb propagating the low band adjusting
circuits Sa and Sb, and only the low band signals Ela and Elb. After level adjustment, they are
synthesized by the mixing circuits 3a and 3b and input to the main amplifiers 2a and 2b, and as a
result, if the gain of the low band adjustment circuits Sa and Sb becomes large, the front left
speaker 1a and the front right The low frequency level of the reproduced sound from the speaker
1b becomes relatively high.
[0008]
The amplifier circuit C, the main volume adjusters 6c and 6d of the amplifier circuit D, and the
auxiliary volume adjusters 5a and 5b of the amplifier circuit a and the low band adjustment
circuits Sa and Sb of the amplifier circuit b are interlocked with each other. The level of the low
range of the front left and right speakers 1a and 1b is relatively increased with the decrease of
the volume of 1d.
[0009]
In the vehicle-mounted stereo reproduction apparatus of the above configuration in the present
invention, when the volume of the rear speaker is reduced for convenience or when it becomes
unnecessary, the low volume of the front speaker can be corrected in conjunction. Can suppress
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the reduction of the sense of bass in the passenger compartment, and prevent the lack of
powerful playback sound.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the in-vehicle
stereo reproduction apparatus of the present invention will be described in detail with reference
to FIG.
The front left speaker 1a and the front right speaker 1b, the rear left speaker 1c and the rear
right speaker 1d are attached to the front left and right and rear left and right, respectively, and
the main amplifiers 2a, 2b, 2c and 2d are connected to each speaker It is done.
The amplification circuit A, amplification circuit B, amplification circuit C, and amplification
circuit D of each channel are connected to the program source 7 via the main volume adjusters
6a, 6b, 6c, 6d.
[0011]
Amplifier circuit A and amplifier circuit B are directly connected to main circuits Ma and Mb
leading to mixing circuits 3a and 3b at the post stage of main volume adjusters 6a and 6b, and
low pass filters 4a and 4b and sub volume adjusters 5a and 5b. The low band adjusting circuits
Sa and Sb leading to the mixing circuits 3a and 3b are connected in parallel, and the audio signal
propagates the original signals Eoa and Eob propagating through the main circuits Ma and Mb
and the low band adjusting circuits Sa and Sb. After being divided into low band signals Ela and
Elb and level adjusted only for the low band signals Ela and Elb, they are synthesized by the
mixing circuits 3a and 3b and input to the main amplifiers 2a and 2b. As the gains of the range
adjustment circuits Sa and Sb become large, the low range level of the reproduced sound from
the front left speaker 1a and the front right speaker 1b becomes relatively high. The main
volume adjusters 6c and 6d, and the low-frequency adjustment circuits Sa and Sb of the
amplification circuit A and amplification circuit B are interlocked with each other, and along with
the reduction of the volume of the rear left and right speakers 1c and 1d, The level of the low
range of the front left and right speakers 1a and 1b is relatively increased. The circuit elements
such as the main volume adjusters used in each of the above amplification circuits can be used in
combination with those having a conventionally used structure, or, for example, they may be
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collectively formed on a common substrate or the like. It goes without saying that it is good.
[0012]
Although the embodiments considered to be representative of the present invention have been
described above, the present invention is not necessarily limited to only the structure of these
embodiments, and includes the above-described components according to the present invention,
and the present invention In order to achieve the purpose mentioned above, the present
invention can be suitably modified and implemented within the range having the effects
mentioned below.
[0013]
As is apparent from the above description, the in-vehicle stereo reproducing apparatus according
to the present invention interlocks when the sound of the rear speaker is unnecessary and the
reproduction level of the rear speaker is lowered. Since the low volume of the front speakers can
be corrected and increased, it is possible to suppress the reduction of the feeling of bass in the
vehicle compartment and to prevent the lack of powerful playback sound.
[0014]
Brief description of the drawings
[0015]
1 is a schematic explanatory view showing the configuration of the embodiment of the present
invention.
[0016]
2 is a schematic explanatory view showing the configuration of a conventional in-vehicle stereo
reproduction apparatus.
[0017]
Explanation of sign
[0018]
1a, 1b, 1c, 1d Speakers 2a, 2b, 2c, 2d of front and rear, right and left channels Main amplifiers
3a, 3b of front, rear, left and right channels Mixing circuits 4a, 4b of front left and right channels
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Low pass filters 5a, 5b of front left and right Front Volume Control 6a, 6b, 6c, 6d for Left and
Right Channels Main Volume Adjuster 7 for Front, Rear, Left and Right Channels Program source
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