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JP2003102086

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DESCRIPTION JP2003102086
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio reproduction chair provided with a speaker in the chair.
[0002]
2. Description of the Related Art When performing audio reproduction accompanied by video
such as a movie or a concert recorded on a DVD (Digital Versatile Disc), audio signals of a
plurality of channels are output to enhance the reproduction effect by, for example, enhancing
presence. Surround playback may be performed. Audio signals of a plurality of channels are
respectively input to speakers disposed on the front left, front right, rear left, rear right, etc., and
are output from the respective speakers.
[0003]
On the other hand, a speaker or diaphragm is incorporated in the back of a chair, a seat or the
like, and an audio signal is amplified by an amplifier so that a person sitting in the chair can hear
or feel the speaker or diaphragm incorporated in the chair. There is a reproduction chair. In the
audio reproduction chair, an audio signal is input from an external audio reproduction device or
the like, and the input audio signal is amplified and output by a speaker or a diaphragm.
10-05-2019
1
[0004]
When performing surround playback of audio, for example, using an audio playback speaker as
the front left and right speakers of a viewer or a speaker of a television apparatus, an audio
playback chair as the rear left and right speakers is used. May use built-in speakers.
[0005]
In surround reproduction, in order to correct a difference in distance from a viewer to each
speaker, an audio signal is delayed for each speaker according to the distance.
[0006]
SUMMARY OF THE INVENTION In ordinary surround reproduction, the front and rear speakers
are arranged at a distance from the viewer.
The surround amplifier apparatus used for that purpose has, for example, a function capable of
correcting the audio signal delay time until the difference between the distance from the viewer
to the front speaker and the distance from the viewer to the rear speaker is about 4.5 m. .
[0007]
When using the speaker built into the audio playback chair as the rear left and right speakers for
surround playback, the speaker built into the back of the audio playback chair according to the
position of the viewer's ear has a distance to the ear of about 10 cm It is in a close position of ~
30 cm.
[0008]
When trying to adjust the audio signal delay time according to the difference between the
distance from the viewer to the front speaker and the distance from the viewer to the rear
speaker, the distance between the speaker and the viewer's ear compared to normal surround
reproduction However, because the distance between the viewer and the front speaker increases,
the difference between the distance from the viewer to the front speaker and the distance from
the viewer to the rear speaker increases.
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For this reason, the audio signal delay time adjustable by the conventional surround amplifier
device may be exceeded.
[0009]
Also, when trying to adjust the audio signal delay time according to the difference between the
distance from the viewer to the front speaker and the distance from the viewer to the rear
speaker, the distance between the rear speaker and the viewer's ear is close Even if the position
and height of the viewer's head are slightly different, the delay time needs to be finely adjusted.
However, in a surround amplifier device or the like conventionally used for surround
reproduction, adjustment is performed, for example, every 0.1 m of the distance between the
viewer and the speaker, that is, every 0.3 ms of delay time of the audio signal. In some cases, the
delay time can not be finely adjusted according to the close distance of about 10 cm to 30 cm.
[0010]
The problem to be solved by the present invention is the distance from the viewer to the front
speaker and the viewer to the rear speaker so that the speaker incorporated in the audio
reproduction chair can be used as the rear speaker for surround reproduction. Even if the
difference with the distance d is large, the difference between the distance from the viewer to the
front speaker and the distance from the rear speaker can be corrected. In addition, the delay time
of the audio signal input to the speaker incorporated in the audio reproduction chair may be
adjusted with sufficient precision to correct the difference between the distance from the viewer
to the front speaker and the distance from the rear speaker. It is about being able to do it.
[0011]
According to a first aspect of the present invention, there is provided an audio reproduction chair
comprising a chair body, an input means for inputting an audio signal, and an amplification
means for amplifying an audio signal inputted by the input means. A speaker for outputting the
audio signal amplified by the amplifying means, a delay means for delaying the audio signal
inputted by the input means, an audio signal from the input means to the speaker via the delay
means It comprises switching means for switching whether or not to transmit, and adjustment
operation means for adjusting the delay time of the delay means.
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[0012]
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing the appearance of
an embodiment of an audio reproduction chair according to the present invention.
Speakers 9 and 10 above the backrest of the chair 13, a vibration generator 11 below the
backrest, and a vibration generator 12 are incorporated in the leg rest. The speakers 9 and 10
are provided in the vicinity of the position at which the viewer sits down and both ears. An audio
signal processing device 1 is provided behind the support legs supporting the chair 13. An audio
signal is output from the audio signal processing device 1 to the speakers 9 and 10 and the
vibration generating units 11 and 12 by wiring (not shown).
[0013]
FIG. 2 is a block diagram showing the configuration of the audio signal processing apparatus of
this embodiment. An audio signal is input to the input terminal 2 from an external audio
reproduction device or the like. The audio signal input to the input terminal 2 is input to the
audio amplification circuit 4 via the switch 3. The audio amplification circuit 4 amplifies the
audio signal and outputs it to the speakers 9 and 10. The viewer can listen to the sound output
by the speakers 9, 10.
[0014]
The audio signal input to the input terminal 2 is branched and input to a low frequency pass
filter (LPF: Law Pass Filter) 7. The LPF 7 passes only the low frequency component of the audio
signal and inputs it to the vibration amplification circuit 8. The vibration amplification circuit 8
amplifies the low frequency audio signal and outputs it to the vibration generation units 11 and
12. The vibration generating units 11 and 12 output as low frequency vibration, and a seated
viewer can experience the output vibration.
[0015]
The operation unit 6 is connected to the switch 3, the audio amplification circuit 4, the audio
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signal processing circuit 5, and the vibration amplification circuit 8, switches the switch 3 by the
operation of the viewer, the output volume by the audio amplification circuit 4, and the audio
signal processing The delay time by the circuit and the amount of output vibration by the
vibration amplification circuit 8 can be adjusted.
[0016]
When the speakers 9 and 10 are used as rear speakers for surround reproduction, the switch 3 is
switched by the operation unit 6 so that an audio signal is input to the audio amplification circuit
4 via the audio signal processing circuit 5.
An audio signal input to a rear speaker from a device for surround reproduction such as an
external surround amplifier is input from the input terminal 2 and input to the audio signal
processing circuit 5 via the switch 3.
[0017]
Here, the audio signal input to the input terminal 2 is a rear speaker delayed to correct a
difference between the distance from the viewer to the front speaker and the distance from the
viewer to the rear speaker by an external surround amplifier or the like. Audio signal. The rear
speaker audio signal is further delayed by the audio signal processing circuit 5 so that the
positions of the adjacent speakers 9 and 10 can be heard from a pseudo remote place and output
to the audio amplification circuit 4.
[0018]
Although the distance from each of the speakers 9 and 10 to the viewer's ear varies depending
on the shape of the chair, the position and height of the viewer's head, etc., the range of about 10
cm to 30 cm in normal use It is inside. Since the speed of sound in air at normal temperature is
about 340 m / s, the difference in distance from the viewer to the speaker is 34 cm, resulting in a
time difference of about 1 ms.
[0019]
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Therefore, if the distance from the viewer to the front speaker is 5 m and the distance from the
viewer to the rear speaker is 0.15 m, then the distance from the viewer to the front speaker and
the distance from the viewer to the rear speaker The difference of the distance to it is 4.85m.
Since the audio signal delay time can be adjusted up to, for example, 4.5 m by the external
surround amplifier, the delay time by the audio signal processing circuit 5 is 0.35 m remaining,
that is, about 1.03 ms. You can adjust it.
[0020]
Practically, by using the audio signal processing circuit 5 capable of setting the delay time every
0.1 ms (3.3 cm), the front speakers can be used when the speakers 9 and 10 are used as a rear
speaker for surround reproduction. And the difference in distance between them can be
corrected with less precision in hearing discomfort.
[0021]
Further, when an audio signal for the rear speaker is input to the input terminal 2 without
delaying the audio signal with a surround reproduction device such as an external surround
amplifier, the audio signal processing circuit 5 allows the viewer to hear the front speaker The
audio signal can be delayed and implemented by the difference of the distance between the
viewer and the rear speaker from the viewer.
Here, for example, if the distance from the viewer to the front speaker is 5 m and the distance
from the viewer to the rear speaker is 0.15 m, the distance from the viewer to the front speaker
and the distance from the viewer to the rear speaker The difference in distance is 4.85 m. The
delay time by the audio signal processing circuit 5 may be adjusted to 4.85 m minutes, that is,
about 14.26 ms.
[0022]
According to the audio reproduction chair of this embodiment, even if the difference between the
distance from the viewer to the front speaker and the distance from the viewer to the rear
speaker becomes large, the audio signal delay time can be sufficiently adjusted. Even when the
built-in speakers 9 and 10 are used as rear speakers for surround reproduction, correction of the
distance difference between the speakers can be made sufficient.
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[0023]
According to the audio reproduction chair of the present invention, the speaker incorporated in
the audio reproduction chair is switched between the normal audio reproduction and the
surround reproduction rear speaker, and the distance from the viewer to the front speaker and
the viewing Even if the difference in distance from the person to the rear speaker is large, the
audio signal delay time can be sufficiently adjusted and used.
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