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JPS63252097

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DESCRIPTION JPS63252097
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sound reproducing apparatus provided with a sound reproducing unit above a backrest of a
chair, and more particularly to a sound reproducing apparatus for reproducing in a personal
zone near the ear without causing trouble to others. [Prior Art] In recent years, a surround
system has been proposed as an attempt to confuse aurally rich realism. This is a method of
giving a feeling of being engulfed in sound, and is a method of installing a speaker not only in
front of the listener but also in back of the listener. Specifically, an acoustic signal supplied to
one or a plurality of rear speakers is reproduced as, for example, a signal obtained by delaying
the left and right sounds from the front or a signal of the difference between the left and right
sounds. . However, in the prior art, the surround reproduction is given a sense of being
enveloped in the sound, considering that the reproduction sound from the front left and right
speakers and the reproduction sound from the rear speakers collide with each other in almost
the opposite direction. There is. Therefore, the sound field listened to by the listener is a sound
field (two-dimensional sound field) formed by the sound from the front and the sound from the
back, and compared with the original sound field in a wide space such as a concert hall, Another
improvement was desired. OBJECTS OF THE INVENTION The object of the present invention is to
make it possible to wrap the listener without disturbing others by means of a three-dimensionally
considered sound field. [Constitution of the Invention] For this purpose, the present invention
provides an acoustic reproduction apparatus in which an acoustic reproduction unit is provided
above the backrest of a chair, wherein a case covering the above backrest is provided and a
speaker is provided on the inner wall of the case. did. EXAMPLES Examples of the present
invention will be described below. FIG. 1 is a diagram showing the joint regeneration circuit. 1
and 1 'are input terminals to which R channel audio signals and L channel audio signals are
input, 2.2' is a buffer, and 3.3 'is a delay whose delay time can be adjusted by control pulses
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applied to control terminals 3a and 3a'. It is a circuit. Further, 4.4 'is an echo circuit, and one
echo circuit 4 is composed of a mixer 41.42, a delay circuit 43, and a gain adjustment circuit
44.45 for setting the output level to the input level or less. The output signal and the signal from
the gain adjustment circuit 45 are mixed (added) by the mixer 42, the output thereof is delayed
by the delay circuit 43, the output thereof is level adjusted by the gain adjustment circuit 44, and
the output thereof is delayed by the mixer 41. A part of the output of the gain adjustment circuit
44 is input to the gain adjustment circuit 45 and is repeatedly mixed with the first signal by the
mixer 42.
Therefore, the desired reverberation can be added by adjusting the gain of the gain adjustment
circuit 44.45 by the control signal applied to the terminals 44a and 45a, and adjusting the delay
time of the delay circuit 43 by the pulse applied to the terminal 43a. it can. As this reverberation
time interval, for example, Looms to several ms or so is preferable. Since the other echo circuit 4
'also has the same configuration, "1 J" is given the same reference numeral to the same
component. If the control pulses to the terminals 43a and 43a 'of the delay circuit 43. 43' are
stopped, there will be no reverberation and only the sound delayed by the delay circuit 3.3 '. A
sound quality adjustment circuit 5 adjusts the frequency characteristic by inputting an output
signal from the echo circuit 4.4 ', and is adjusted to cut a component of 10 KHz or more, for
example. Note that the sound quality may be adjusted by a control signal to the terminal 5a so as
to change the cut component or make it uncut according to the preference of the sound. An
addition / subtraction circuit 6 subtracts the two input signals output from the sound quality
adjustment circuit 5 by addition / subtraction at the proper ratio and outputs the result as an H
signal, and is switched by the control signal from the terminal 6a. 7 is a subtraction circuit (LR)
that subtracts the output signal from the echo circuit 4.4 ', 8 is a low pass filter that extracts a
component of 7 KHz or less from the output signal from the subtraction circuit 7, and 9 is a noise
removal circuit . VRI to VR5 are linked variable resistances for adjusting volume, VRI is for L
speaker on the side, VH2 is for R speaker on the side, VH2 is for center speaker for surround,
VH4 is for surround speaker for speaker, and VH5 is surround For the R speaker. Although the
delay circuits 3.3 'and 43.43' described above can be configured by BBDs (packet bridge devices),
C0Ds (charge coupled devices) can also be used. It is possible. However, when this CCD is used,
for example, the input signal after the buffer 2.2 'is modulated at high frequency and delayed by
the CCD, and then the low frequency component is generated by, for example, the circuit before
circuit 4.5.7. Need to be demodulated. FIG. 2 is a view showing a sound reproducing apparatus A
of the present embodiment. The sound reproduction device A is provided with a sound
reproduction unit at the top of the chair 20. The chair 20 has a headrest 22 above the backrest
21, and a case 23 rotatable in the longitudinal direction B, B ') with the right and left shafts 30 of
the headrest 22 as pivots, The head rest portion 22 is covered from the upper side.
The upper surface and the left and right surfaces of the case 23 are formed of a rigid material
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such as hard plastic, and the rear surface is open or covered with a temporary or cloth of the
same material as that described above. The inside is covered with a sound absorbing material
such as felt. When the case 23 is vJ turned in the backward direction (arrow B 'direction), the
case 23 comes off from above the head of the person sitting on the chair 20 and enables
attachment / detachment to the chair 20 and vice versa When it is turned in direction B), it will
cover the head of the seated person completely. The center of gravity moves to the rear side in
the state of rotating in the backward direction, and the center of gravity moves to the front side
in the state of rotating in the front direction. Then, a U-shaped speaker holding member 24 is
attached to the inner front side of the case 23, and side speakers 25 for reproducing audio
signals from the volumes VRI and VR2 of FIG. 1 on both sides of the speaker holding member 24.
.26 is attached. Further, on the upper side, on-surround speakers 27. 28 for reproducing audio
signals from the volumes VR4 and VR5 of FIG. 1 are attached. In addition, these speakers 25-28
are for full range ░. Reference numeral 29 denotes a low-frequency surround back center
speaker provided behind the head rest portion 22, which reproduces an audio signal from the
volume VR3 of the circuit of FIG. The audio signals of the R and L channels applied to the input
terminals 1 and 1 'are directly input to the variable resistors VRL and VR2 and reproduced by the
side speakers 25.26, whereby the conventional stereo reproduction is performed. The voice
signal input to the delay circuit 3.3 'is delayed there and input to the echo circuit 4.4'. At this
time, it is possible to make the delay time of the delay circuit 3.3 'different. In the echo circuit 4,
the first arriving sound signal is mixed with the sound signal after the delay time set by the delay
circuit 43 by the mixer 41 via the mixer 42, the delay circuit 43, and the gain adjustment circuit
44, thus The first echo of the sound signal becomes an echo that has been attenuated only by the
gain adjustment circuit 44 compared to the original. Since the echo of the second shot enters
another gain adjustment circuit 45 and then passes through the mixer 42, the delay circuit 43,
and the gain adjustment circuit 44 to the mixer 41, it is further delayed in time compared to the
signal of the first shot. It is also strongly attenuated. The third and fourth shots have more delay
and attenuation. And since this action is performed in a complicated manner, it becomes possible
to add a desired echo.
Then, by appropriately setting the delay time of the delay circuit 43 and the gain setting of the
gain adjustment circuit 44. 45, it becomes possible to realize an anti-customer sound matched to
an actual hole. The above applies to the other echo circuit 4 '. The echo circuit 4.4 'may be a
circuit that delays only once. In this case, the circuit 42. 45 may be omitted or the output of the
circuit 45 may be made substantially zero by the control signal to the control terminal 45a.
When echo is not required, the gain of the circuit 44 may be made zero by the control signal to
the control terminal 44a of the circuit 44. These need to be performed similarly for the other
echo circuit 4 '. The circuit from the subtraction circuit 7 to the noise removal circuit 9 processes
an L-R signal. Here, since the in-phase component of the L channel component and the R channel
component in the output signal from the echo circuit 4.4 ? is canceled out, the treble
component of the echo from the wall etc. is largely eliminated in the actual hole, As appropriate,
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high-frequency components are cut by the low-pass filter 8 and components from which noise
components have been removed by the noise removal circuit 9 are reproduced from the center
speaker 29 of the surround. Therefore, a complex reverberation sound is reproduced from the
center speaker 29, and it becomes a pseudo sound as a reverberation sound in which a plurality
of sounds reflected by the back wall and the top wall in a hole etc. are mixed in a multi-pass. If
the sound of about 100 Hz is emphasized and reproduced from the center speaker 29, sleep
action can be promoted. The tone adjustment circuit 5 attenuates high frequency components of
the output signal from the echo circuit 4.4 ?, for example, cuts components above 10 KHz or
components above other frequencies, or does not cut at all to the addition / subtraction circuit 6
Send out. At the two outputs of the addition / subtraction circuit 6, signals obtained by
subtracting appropriate amounts of signal components of both channels, such as ?L-?R1?R?L, are obtained. ? and ? are coefficients, and ? ? 1 and ? ? 1. Therefore, in the case of ?1 and ? = 0, the signal components of L and R are obtained by dividing, and in the case of ? = 0
and ?-1, the channel is inverted as -R. 1 g 3 components are obtained separately. With the
above-mentioned speakers 27 to 29 on the surround side, L-channel sound from the side and Rchannel sound are reflected in the hall and indirect sound that has undergone various
deformations in phase, time, health, path and frequency. It is reproduced as a similar voice. And,
since the speakers 27-29 of the surround are located above or behind the headrest 22, the
traveling direction of the sound emitted from the side speakers 25.26 and the speakers 27-29 of
the surround The traveling direction of the sound to be emitted intersects with or near the
headrest 22 so as to be substantially orthogonal.
Therefore, for a listener who sits in the chair 20 and places his head on the headrest 22, a threedimensional sound field is formed in the head, and the sound field is an original sound field
generated in a concert hall or the like. And the same natural-sounding reproduction sound field
as the surround effect becomes extremely good. If the speakers 25 and 27 are for stereo R signal
and the speakers 26 and 28 are for L signal and the speaker 29 is for both-channel composite
bass, instead of the surround sound as described above, the R signal and L may be used. Both
signals are emitted from diagonally above the ear by vector synthesis, and listener's fatigue is
reduced compared to the case where the sound is emitted from just beside the ear. FIG. 4 is a
figure which shows another example of the sound reproduction part attached to the upper part
of a chair. In this example, when the upper surface U-shaped frame 31 is non-rotatably fixed to
the shaft 30 functioning as a pivot of the case 23 and the case 23 is pivoted in the arrow B
'direction, The lower inner corner 24 a of the speaker support 24 is in contact with the notch 31
b of the side plate 31 a of the body 31. Further, a stopper 32 is provided on the back side of the
case 23, and when the case 23 is rotated in the arrow B direction, the stopper 32 is in contact
with the back plate 31c of the frame 31. The center speaker 29 can be fixed to the back plate 31
c of the frame 31. [Effects of the Invention] From the above, according to the present invention, it
is possible to generate a sound field that sounds natural close to the original sound field in a
concert hall or the like in a personal zone near the ear without bothering others. There is.
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[0002]
Brief description of the drawings
[0003]
1 is a circuit diagram of the sound reproduction circuit, FIG. 2 is a perspective view of a chair
with the sound reproduction unit of the present embodiment attached to the top, FIG. 3 is a view
showing the front of the sound reproduction unit, FIG. al, (bl is a cross-sectional view of another
example of the sound reproducer attached to the top of the chair.
1.1 ? иии input terminal, 2.2 ? иии buffer, 3.3 ? иии delay circuit, 4.4 ? ? coding circuit, 5 иии tone
control circuit, 6 иии addition and subtraction Circuits 7: Subtractor circuit 8. Low pass filter 9.
Noise removal circuit 25. 26 Side speakers 27 to 29 Surround speakers 20 Chairs.
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