close

Вход

Забыли?

вход по аккаунту

?

JPH06315199

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH06315199
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound field correction apparatus. More particularly, the present invention relates to a sound field
correction device aimed at sound field improvement for asymmetric listening in stereo
reproduction. The invention is particularly applicable to, but not limited to, automotive sound
field correction devices.
[0002]
2. Description of the Related Art When listening to stereo reproduction, it is ideal to use standard
listening. That is, it is ideal that the arrangement positions of the speakers with respect to the
listening position are symmetrical. However, for some reason, the arrangement positions of the
speakers may not be symmetrical with respect to the listening position.
[0003]
An example of such stereo reproduction that results in asymmetric listening is an on-vehicle
audio device. In the on-vehicle audio apparatus, the arrangement position of the speaker is
restricted, and the listening position is also limited, resulting in asymmetric listening. As a result,
the left and right stereo balance is broken, and the feeling of expansion is lost.
10-05-2019
1
[0004]
Therefore, a sound field correction device has been devised for the purpose of sound field
improvement with respect to such asymmetric listening. FIG. 4 is a block diagram and a plan
view for explaining a conventional sound field control device. Now, it is assumed that the
listening position is the driver's seat 38. And as for the arrangement position of the speakers 36
and 37 on either side, as shown to the same plan, suppose that it exists in the front left and right
of a front seat.
[0005]
The right stereo signal R is delayed by the delay circuit 34 and then reproduced by the speaker
37. On the other hand, to the left stereo signal L, a signal obtained by inverting the right stereo
signal R is added, and the addition signal is reproduced by the speaker 37. That is, the stereo
signal R on the right side is inverted by the inverting amplifier 31, appropriately attenuated by
the attenuator 35, and then added to the stereo signal L on the left side by the addition circuit
33.
[0006]
In the conventional sound field correction apparatus, in this way, even if the listening position 38
is close to the right speaker 37 and far from the left speaker 36, the left-right stereo balance is
improved and a sense of expansion is also obtained. There is. Incidentally, as described above, a
signal that is inverted and added from one to the other of the stereo signals is called a crosstalk
signal.
[0007]
Certainly, by using the conventional sound field control device, the left-right stereo balance in
asymmetric listening is improved, and a feeling of spread is also obtained. However, when the
conventional sound field control device is used, the feeling of muffling is immediately felt, and
furthermore, the sense of localization of the sound image is greatly impaired, and the sense of
opposite sense of auditory sense occurs. And, when such a feeling of stagnation and reverse
10-05-2019
2
feeling occur, the sound field becomes aurally unnatural. In particular, this tendency is enhanced
when the opposite sense of mind is generated.
[0008]
As described above, the conventional sound field control device has the problem that although
the left and right stereo balance in asymmetric listening is improved and a sense of spread is
obtained, the reproduced sound field is aurally unnatural. , Improvement is desired.
[0009]
The technical problem of the present invention is to pay attention to such problems, and in the
sound field correction device for the purpose of sound field improvement for asymmetric
listening in stereo reproduction, deterioration of left and right stereo balance due to asymmetric
listening and deterioration of sense of spread. In order to be aurally natural.
[0010]
FIG. 1 is a block diagram for explaining the basic principle of the present invention.
The sound field correction apparatus according to the present invention comprises a signal
inverting means 1 for inverting one of the stereo signals S2, a mid band signal component
filtering means 2 for passing the mid band component of the signal output by the signal
inverting means 1, and It has signal combining means 3 for combining the signal output from the
range signal component filtering means 2 and the other S1 of the stereo signal, and delay means
4 for delaying one S2 of the stereo signal.
[0011]
Further, the delay means 4 may be connected in series to the signal inverting means 1, that is,
may be connected to the front stage of the signal inverting means 1.
[0012]
In general, the low band included in the reproduction source is omnidirectional.
10-05-2019
3
That is, the phases of the low frequency components of the left and right stereo signals are in
phase.
In the conventional sound field correction apparatus, it has been found that the cause of the
negative sense of phase is that the main cause is that the low frequency components cancel each
other in negative phase due to the addition of the crosstalk signal.
[0013]
On the other hand, the phase of the high-frequency component included in the reproduction
source is not in phase but has various phase differences. And, in the conventional sound field
correction apparatus, the above-mentioned sense of opposite phase occurs because the addition
of the above-mentioned crosstalk signal does not cause the high frequency components to be in
the opposite phase and cancel each other, but rather in the opposite phase. It turned out that the
main factor is that the increased high-frequency component is added.
[0014]
The sound field correction apparatus according to the present invention is configured to cut off
the low frequency component and the high frequency component that are conventionally causes
of unnaturalness and extract only the mid frequency component to generate a crosstalk signal.
ing. As a result, unlike conventional cases, there is no such thing as creating a feeling of
stagnation and a sense of opposition. Therefore, according to the present invention, it is possible
to improve the deterioration of the left and right stereo balance and the deterioration of the
sense of spread so as to be aurally natural.
[0015]
Next, how the sound field correction apparatus according to the present invention is embodied in
practice will be described by way of examples. FIG. 2 is a block diagram and a plan view for
explaining the first embodiment of the present invention. Hereinafter, the case where the present
invention is applied to a vehicle-mounted sound field control apparatus will be described using
this embodiment. The same view is a view from above of the front seat of the vehicle.
10-05-2019
4
[0016]
In the present embodiment, the listening position is the driver's seat 18, and the arrangement
positions of the speakers 16, 17 are the left and right front of the front seat, as shown in the
figure. The right stereo signal R is delayed by the delay circuit 14 and then reproduced by the
speaker 17. The crosstalk signal is generated by inverting the right stereo signal R by the
inverting amplifier 11, extracting only the mid band component by the band pass filter 12, and
adjusting the level to an appropriate level by the attenuator 15.
[0017]
As described above, in the present invention, since the crosstalk signal contains only the midrange component, unlike the conventional case, a feeling of stagnation does not occur, and a
sense of opposite phase does not occur. The crosstalk signal generated in this manner is added to
the stereo signal L on the left side by the addition circuit 13, and the added signal is reproduced
by the speaker 16.
[0018]
According to the above configuration, the speaker 17 is felt as if it is at the position of the
speaker 17 ', and although it is asymmetrical listening, the left-right stereo balance becomes
good like the standard listening, and a feeling of spread is also obtained. In addition, since there
is no feeling of stagnation and a sense of oppositeness, it is aurally natural unlike the prior art.
[0019]
The characteristics of the above-mentioned band pass filter can be obtained with good results if
the pass band is several hundreds Hz to several KHz. As an example, good results were obtained
from 150 Hz to 3 KHz. Further, when the delay time is set to a value obtained by dividing the
difference in distance between the listening position and the left and right speakers by the speed
of sound, good results can be obtained.
10-05-2019
5
[0020]
Next, an embodiment in the case of setting the listening position to the owner seat will be
described. FIG. 3 is a block diagram and a plan view for explaining the second embodiment of the
present invention, and is a view for explaining the case where the listening position is the owner
seat. The owner's seat is opposite to the driver's seat in the arrangement of the speakers, so the
direction in which the crosstalk signal is added is also opposite to the above example.
[0021]
That is, the crosstalk signal is generated by inverting the left stereo signal L by the inverting
amplifier 21, extracting only the mid band component by the band pass filter 22, and adjusting
the level to an appropriate level by the attenuator 25. The left stereo signal L is delayed by the
delay circuit 24 and reproduced by the speaker 26. The stereo signal R on the right side is added
to the crosstalk signal by the adding circuit 23, and the added signal is reproduced by the
speaker 27.
[0022]
With such a configuration, the speaker 26 is felt as if it is at the position of the speaker 26 ', and
while being asymmetrical listening, the left-right stereo balance becomes good as in standard
listening, and a feeling of spread is also obtained. In addition, unlike conventional ones, there is
no feeling of stagnation, no sense of oppositeness, and it is also aurally natural.
[0023]
According to the sound field correction apparatus of the present invention, as described above,
only the mid band signal component is extracted to generate the crosstalk signal. Therefore,
unlike the prior art, the sense of stiffness and reverse are different. It has become possible to
improve the left and right stereo balance and to obtain a sense of spread without causing a
feeling of affinity. And, as a result of no sense of stagnation and opposite feeling, it became
natural in terms of hearing.
10-05-2019
6
[0024]
Therefore, according to the present invention, in asymmetric listening of stereo reproduction, it
was possible to improve the deterioration of left and right stereo balance and the deterioration of
the sense of spread so that it becomes audible naturally.
10-05-2019
7
Документ
Категория
Без категории
Просмотров
1
Размер файла
14 Кб
Теги
jph06315199
1/--страниц
Пожаловаться на содержимое документа