close

Вход

Забыли?

вход по аккаунту

?

JP2005197934

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 JP2005197934
PROBLEM TO BE SOLVED: When the listener is displaced in the left and right direction, the
stereo image becomes extremely narrow. SOLUTION: In order to solve the above-mentioned
problems, the present invention has a first speaker driver 6 whose vibration axis is disposed at
an angle of 90 degrees + α with respect to a listener direction in order to reproduce L channel, L
In order to reproduce the channel, it comprises a second speaker driver 7 whose vibration axis is
disposed at an angle of 90 degrees + α with respect to the listener direction. [Selected figure]
Figure 3
スピーカ
[0001]
The present invention relates to a two-channel speaker.
[0002]
A so-called home theater system for reproducing multi-channel surround signals such as 5.1
channel or 6.1 channel has prevailed in general homes.
This system basically reproduces each channel signal by an independent speaker for each
channel. Therefore, in the case of 5.1 channel reproduction, it is necessary to dispose three
speakers for the front L channel, front center channel and front R channel in the front, and two
speakers for the rear L channel and rear R channel at the rear . In addition, subwoofers are also
10-05-2019
1
required in most cases for bass reproduction.
[0003]
The applicants of the present application set forth in Japanese Patent Application No. 2003293850 the respective vibration axes of the L channel speaker driver for reproducing L channel
signals and the R channel speaker driver for reproducing R channel signals at an angle of 180
degrees to each other. Proposed a speaker system arranged at an angle of 90 degrees to the left
and right with respect to the listener direction. According to this system, since the sound is
emitted at an angle of 180 degrees from the L channel speaker driver and the R channel speaker
driver, the L channel signal and the R channel signal are not localized at the position of the
speaker driver. It is possible to localize at a distant position and obtain a wide stereo image.
[0004]
The listening position is located at an equal distance from the two speaker drivers, and when the
listener is located at this listening position, the listener can not see the diaphragm of the speaker
driver. However, when the listener shifts in the lateral direction, the diaphragm of one of the
speaker drivers can be seen. If the listener is displaced further to the left or right than this
position, the stereo image becomes extremely narrow because the sound localized at a position
far from the speaker driver is localized at the position of the speaker driver. Therefore, the
listening area where a wide stereo image can be obtained is narrow in the lateral direction.
[0005]
In order to solve the problems described above, the present invention reproduces the L channel,
the first speaker driver 6 whose vibration axis is disposed at an angle of 90 degrees + α with
respect to the listener direction, in order to reproduce the L channel. The second speaker driver
7 has its vibration axis disposed at an angle of 90 degrees + α with respect to the listener
direction.
[0006]
According to the present invention, a wide sound image localization can be obtained without
increasing the distance between the left and right speaker drivers.
10-05-2019
2
[0007]
Hereinafter, the best embodiment according to the present invention will be described with
reference to the attached drawings.
[0008]
Hereinafter, examples of the present invention will be described.
1 to 3 are a front view, a right side view and a top view of a speaker box 1 used in the present
invention.
Three enclosed enclosures 2, 3, and 4 are integrally provided in the speaker box 1, and the
enclosures 2, 3, and 4 include the front center channel speaker driver 5, the front L channel
speaker driver 6, and the front R. Channel speaker drivers 7 are provided respectively.
The front center channel speaker driver 5 is disposed to face the listener. On the other hand, the
vibration axes of the front L channel speaker driver 6 and the front R channel speaker driver 7
are each further about 3 degrees from the angle of 90 degrees to the left and right with respect
to the vibration axis of the front center channel speaker driver 5 in the horizontal direction. They
are placed back to back with each other at an angle.
[0009]
Therefore, the vibration axes of the front L channel speaker driver 6 and the front R channel
speaker driver 7 are at an angle of 174 degrees, so the reproduced sound from each of the
speaker drivers 6 and 7 is in space in the opposite direction to each other. It is emitted.
Therefore, this angular arrangement has the same effect as the speaker drivers 6 and 7 arranged
at a large interval. Of course, with this angular arrangement, the vibration axis of the speaker
driver does not face the listener directly, which may cause a problem that particularly the high
frequency characteristics deteriorate, in which case the high frequency attenuated by a wellknown equalizer circuit Can be compensated. Reference numerals 8 and 9 denote partition walls
for separating the enclosures 2, 3 and 4, respectively.
10-05-2019
3
[0010]
FIG. 4 is a circuit block diagram of a home theater system including an amplifier for driving the
speaker drivers 5 to 7 described above. Digital data from the DVD drive 10 provided with an
optical pickup, a mechanical part such as a turntable, various servo circuits, and a data
demodulation circuit is input to the 5.1 channel decoder 11, and the front L, front center, front R,
rear L, rear The R channel and subwoofer channel signals are decoded respectively. Digital
signals of the front L, the front R and the front center channel are input to one input terminal of
the adders 12, 13 and 14, respectively.
[0011]
On the other hand, rear L and rear R channel signals are input to the virtualizer 16. The
virtualizer 16 has, for example, a filter having a filter characteristic that provides an impulse
response such that the reproduced sound can be heard from the rear left side of the listener even
if the rear L channel signal is reproduced by the speaker installed on the front side of the
listener. is there. In general, this filter coefficient is called a head-related transfer function
(HRTF), and the input signal has position information by performing a convolution operation
process. The configuration of the virtualizer itself is well known in the art and is not directly
involved in the present application, so the details will be omitted.
[0012]
The output of the virtualizer 16 is input to the other input terminal of the adders 12 and 13,
whereby the front L channel signal and the output of the virtualizer 16 are added by the adder
12, and this added signal is D / A converter It is input to 15. Similarly, the adder 13 adds the
front R channel signal and the output of the virtualizer 16, and this added signal is input to the
digital amplifier 15.
[0013]
On the other hand, after the front L channel signal and the front R channel signal are added by
the adder 17, a band pass filter (hereinafter referred to as "BPF") which passes signals in the 300
Hz to 2 KHz frequency band via the gain adjustment attenuator R1. ) Is input. The output of the
10-05-2019
4
BPF 18 is input to an inverter 19 which rotates the phase 180 degrees. A front L + front R signal
whose phase is inverted by 180 degrees and having a frequency band of 300 Hz to 2 KHz is
input to the other input terminal of the adder 14 and is added to the front center channel signal
to be input to the digital amplifier 25.
[0014]
During reproduction of a CD, the 5.1 channel decoder 11 outputs an L channel signal to a
terminal that has output a front L channel signal and outputs an R channel signal to a terminal
that has output a front R channel signal.
[0015]
A front L channel signal converted into a PWM signal by the digital amplifier 25 and one output
of the virtualizer 16 pass through a low pass filter (hereinafter referred to as LPF) 26 to be an
analog signal, and then output to the L channel speaker driver 6. It is input.
Similarly, the front R channel signal converted to a PWM signal by the digital amplifier 25 and
the other output of the virtualizer 16 are converted to an analog signal by the LPF 31 and then
input to the R channel speaker driver 7. Furthermore, the phase is inverted by 180 degrees from
the front center channel signal converted to an analog signal by the LPF 31 and the addition
signal with the front L + front R signal having a frequency band of 300 Hz to 2 KHz is input to
the speaker driver 15 for center channel.
[0016]
The 5.1 channel decoder outputs a subwoofer output. This signal is also converted to a PWM
signal by the digital amplifier 15, and then converted to an analog signal by the LPF 26 to drive
the subwoofer 25. The DVD drive 10 and the 5.1 channel decoder 11 are controlled by the
microcomputer 20.
[0017]
With the above configuration, the L channel signal is output from the L channel speaker driver 6
10-05-2019
5
and the R channel signal is output from the R channel speaker driver 7 when the 5.1 channel
signal is reproduced, and the radiation direction is 174 degrees. Stereo images are played back.
Further, since a center channel signal such as a serif to be localized to the center is output from
the center channel speaker driver 5, no hollowing out occurs.
[0018]
Furthermore, although the L channel signal of the reverse phase is output from the center
channel speaker unit 5, this reverse phase component cancels the L channel signal around the
right ear of the listener rather than around the left ear. Therefore, the level of the L channel
signal in the vicinity of the listener's right ear becomes low, and as a result of the L channel
signal being heard strongly in the left ear, the listener recognizes that the L channel signal comes
from the left side. As a result, stereo separation is improved along with the arrangement of the
speaker drivers. Of course, the R channel signal also produces the same effect.
[0019]
Here, for example, when the listener is positioned to the left from the vibration axis of the center
channel speaker unit 5 which is the listening position, the vibration surface of the L channel
speaker driver 6 can be seen, but the reproduced sound is heard just at that position. The
localization position of the L channel signal becomes the position of the L channel speaker driver
6, and the stereo image is extremely deteriorated. Therefore, in the present embodiment, as
shown in FIG. 3, the installation angle of the L channel speaker driver 6 is further shifted to the
opposite side at an angle α from the angle of 90 degrees with the listener direction, and the
diaphragm of the speaker driver 6 is visible. There is no further expansion. In the present
embodiment, the angle α is set to 3 degrees.
[0020]
Of course, by setting the angle to 3 degrees or more, it is possible to enlarge the range where the
diaphragm of the speaker driver 6 can not be seen, that is, the listening area, but in that case
usually by the wall located behind the speaker box 1 The reflected sound becomes large and the
localization position of the sound image becomes unclear. In addition, the frequency
characteristic of the high frequency band is further deteriorated, and it is necessary to increase
the amount of high frequency band boost by the equalizer circuit. For example, the angle is set in
10-05-2019
6
consideration of the use environment. The vibration axis of the right channel speaker driver 7
also swings to the opposite side at an angle α of 3 degrees from the angle of 90 degrees in the
same way as described above, and as a result, for the center channel facing the listener direction
The vibration axis of the speaker driver 5 has an angle of 93 degrees.
[0021]
The -L channel signal and -R channel signal output from the center channel speaker unit 5 are
reverse phase components of the L channel signal and the R channel signal, that is, reverse phase
signals of monaural components. Therefore, the inverted monaural component is output from the
center channel speaker driver 5 even when the two channel signal is reproduced, so that the
hollow channel can be prevented as in the case of the center channel signal at the 5.1 channel
signal. .
[0022]
Although the above embodiment has been described by applying the present invention to a
speaker for 5.1 channel reproduction, the present invention is not limited to the above
embodiment and has two speaker drivers and at least two. It is applicable if it is a speaker which
reproduces a channel. Further, the angle α shown in FIG. 3 can be set as appropriate, and
various aspects can be taken without departing from the spirit of the present invention.
[0023]
FIG. 2 is a front view of the speaker box 1; FIG. 2 is a left side view of the speaker box 1; FIG. 2 is
a top view of the speaker box 1; Circuit block diagram.
Explanation of sign
[0024]
1 スピーカボックス 5、6、7 スピーカドライバ 11 5.1チャンネルデコーダ 15 デジタ
ルアンプ 16 バーチャライザ 20 マイコン 25 サブウーハ
10-05-2019
7
10-05-2019
8
Документ
Категория
Без категории
Просмотров
0
Размер файла
16 Кб
Теги
jp2005197934
1/--страниц
Пожаловаться на содержимое документа