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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 make the auditory sense of presence real. 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. According to the present invention, there is provided an audio
reproducing apparatus in which an audio reproducing unit is provided above a backrest of a
chair, wherein an expandable cover is provided to cover the above backrest, and a speaker is
provided inside the cover. Provided. EXAMPLES Examples of the present invention will be
described below. FIG. 1 is a diagram showing the sound reproduction circuit. 1 and 1 'are input
terminals to which R channel audio signals and R 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 applied to control
terminals 3a and 3al. 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 whose output
level is less than that of the input current, and 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
'has the same configuration, the same components are denoted by the same reference symbols
r'j. If the control pulse to the terminal 43a 143a 'of the delay circuit 43. 43' is stopped, there will
be no reverberation and the sound will be just delayed by the delay circuit 3.3 '. A sound quality
adjustment circuit 5 adjusts the frequency characteristics by inputting an output signal from the
echo circuit 4.4 ', and is adjusted to have a component of, for example, 10 KHz or more. 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. Reference numeral 6
denotes an addition / subtraction circuit which subtracts the two input signals output from the
sound quality adjustment circuit 5 by addition / subtraction at an appropriate ratio and outputs
the result as an R signal, and is switched by a 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 . ? R1 to VR5 are linked variable resistances for
volume adjustment, VRI is for side speaker, VH2 is for R speaker on side, VH3 is for center
speaker for surround, VR4 is for surround speaker for speaker, VH2 Is for the surround R
speaker. Although the delay circuits 3.3 'and 43.43' described above can be configured as BBDs
(packet pre-gate devices), they can also be used as CCDs (charge coupled devices). 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
configured by providing a sound reproduction unit above the chair 20. The chair 20 has a head
rest 22 above the backrest 21. The head rest 22 is U-shaped so as to be rotatable in the frontrear direction (arrows B and B ') with the right and left shafts 30 as pivots. A frame 23 is
Then, on the back of the frame 23, that is, above and above the headrest 22, the cover 30 of the
campus is stretched in the directions of arrows B and B 'by a plurality of aggregates. When the
cover 30 is reduced in the backward direction, the frame 23 comes off from above the head of
the person sitting on the chair 20 to allow its attachment to and detaching from the chair 20.
Conversely, when extended in the forward direction, the cover 30 sits down. It will completely
cover the head of the person. The frame body 23 moves its center of gravity to the rear side in
the state of rotating in the backward direction to contract the cover 30, and in the state of
rotating in the front direction, the frame moves to the front side and pulls the cover 30. It is held.
In addition, a stopper can also be used for this holding | maintenance. A U-shaped speaker
holding member 24 is similarly attached to the inside of the frame 23, and side speakers for
reproducing audio signals from the volume R1 and VR2 of FIG. 1 on both sides of the speaker
holding member 240. 25.26 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 terminal 1.1 'are directly input to the variable resistors R1 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 setting the gain of the
gain adjustment circuit 44, 45, echo sound matched to the actual hole can be realized. 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, 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. It is possible to promote the
sleep action by emphasizing and reproducing the sound of about 100) 1z from the center
speaker 29. The tone adjustment circuit 5 attenuates high frequency components of the output
signal from the echo circuit 4.4 ?, for example, cuts components above 1OKltz or components
above other frequencies, or does not cut at all to the addition / subtraction circuit 6 Send out. At
two outputs of the addition / subtraction circuit 6, a signal obtained by subtracting an
appropriate amount of signal components of both channels, such as ?L-?R1?R-?L, is
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 separately, and in the case of ?-0 and ?-1,
the signal is obtained by inverting the channel like -R. The components are obtained separately.
L-channel sound from the side and R-channel sound from the side are inverted in the hall by the
above-mentioned speakers 27 to 29 on the surround side, and indirect sound that has undergone
various deformations in phase, time, level, route and frequency Is reproduced as a pseudo sound.
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's spy force 25.26, and the speakers 27 of
the surround The direction of travel of the sound emitted from 29 intersects the portion of the
headrest 22 or near it 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 at the head, and the sound field is an original sound generated
in a concert hall or the like. It becomes a natural-sounding playback sound field similar to a
place, and the surround effect becomes extremely good. If the speakers 25 and 27 are for R
signal and the speakers 26 and 28 are for L signal instead of the surround sound as described
above, each signal is emitted from diagonally above the ear by vector synthesis. Therefore, it is
less fatigued than when it is emitted from the side of the ear. In this case, the center speaker 29
may reproduce the synthesized bass of both channels. 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. It is
characterized by
Brief description of the drawings
FIG. 1 is a circuit diagram of a sound reproduction circuit, FIG. 2 is a perspective view of a chair
which is a sound reproduction apparatus of the present embodiment, and FIG. 3 is a view
showing a part of the front 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 23. Frame 25. 26 Side speakers 27 to 29 Speakers for surround 30 ...
cover, 20 ... chair.
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