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3. Detailed description of the invention [Industrial field of application] The present invention is
rich in presence so that it can obtain a natural listening window substantially the same as the
original sound to be heard in a wide space such as a concert hall etc. The present invention
relates to a reproduction apparatus for reproducing sound, and more particularly to a sound
reproduction apparatus for reproducing in a personal zone near the ear without causing trouble
to others. [Prior Art] Comparison of the listening window and the physical quantity related to it:
? Realism / Dense feeling-Lateral component ? Richness of sound / Largeness of sound Initial
initial reflection energy ? Forward localization / Balance -Front-to-back ratio ?, Clarity и Clarity
?, Sound reverberation и Reverberation time ?, Sparkle / High-low range / Mid-range ?, Bass
feeling-Low-range / Mid-range, These physical quantities are specific listening It is effective in
evaluating the psychological acoustic listening window at the position, and covers all the
transient characteristics, steady-state characteristics and directivity of the sound field under the
condition that the listening location is constant. In recent years, a variety of methods have been
considered, which are called surround as an attempt to give a sense of reality rich in auditory
sense. The main way is to give it a feeling of being trapped in the sound. This is a method of
installing the speaker not only in front of the listener but also behind it. Specifically, in
consideration of the physical quantity, an acoustic signal supplied to one or a plurality of rear
speakers is, 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. And the like, and further reproduced
as a signal combining the above-mentioned physical quantities. However, in this surround
reproduction, the above-mentioned various physical quantities are adjusted in consideration of
the fact that the reproduced sound from the front left and right speakers and the reproduced
sound from the rear surround speaker collide with each other in substantially the opposite
direction. I try to give a good sense of listening, that is, a feeling of being covered in sound.
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.
[Object of the invention] It is an object of the present invention to provide a sound reproducing
apparatus capable of reproducing a sound field closer to the above-mentioned original sound
field by wrapping the listener in a three-dimensionally considered sound field. It is. For this
purpose, the sound reproducing apparatus according to the present invention comprises left and
right speakers installed on both sides of a listening position, and audio signals installed
substantially above or above and behind the listening position and supplied to the left and right
speakers And an upper speaker for reproducing an audio signal delayed at least.
EXAMPLES Examples of the present invention will be described below. FIG. 1 is a diagram
showing the sound reproduction circuit. 1.1 'is an input terminal to which R channel audio signal
and L channel audio signal are input, 2.2' is a buffer, and 3.3 'can adjust delay time by control
pulse applied to control terminals 3a and 3 a1 It is a delay 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. The reverberation time interval is preferably, for example, about 100 m to about 5 ms.
Since the other echo circuit 4 'has a similar configuration, the same reference numerals are
assigned the same reference numerals as fL ". 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
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. 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
. VRI to VR5 are linked variable resistances for adjusting the volume, VRI is for side I, for speaker
10, VH2 is for side R speaker 11, VH2 is for surround center speaker 12 and VH2 is surround L
speaker 13 , And VH5 are for the R speaker 14 for surround (see FIG. 2).
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 an
example in which the sound reproducing apparatus of the present embodiment is incorporated in
a chair 20. As shown in FIG. In this chair 20, the device 21 constituting the above-mentioned
circuit component is attached to the right armrest 22 and speaker holders 24 to 26 made of
pipes on both sides of the head rest 23 at the upper part of the back thigh Are attached by the
fixtures 27.28. Then, for the speaker holder 24 extending upward from the fixture 27.28, the
sound emission direction of the center speaker 12 for surround, the L speaker 13 and the R
speaker 14 in the upper part thereof is downward. The cabinet 29 loaded therein is rotatably
mounted in the arrow A direction. The speaker holder 24 is also movable in the arrow B
direction, that is, in the vertical direction. More specifically, the cabinet 29 is located in a zone
approximately from the upper to the rear of the listener's ear sitting on the chair 20, and the
sound emitted from each of the speakers 12 to 14 is from above the listener's head. Or it is
installed so that it may go to the listener from the upper back. Further, the side speakers 10 and
11 are attached to the other speaker holders 25 and 26 so as to be rotatable in directions of
arrows c and c '. The speaker holders 25 and 26 are also movable in the arrow B direction. The
audio signals of the R and L channels applied to the input terminal 1.1 'are directly input to the
variable resistors VRI and VH2 and reproduced by the side speakers 0 and 11, 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 and the delay circuit 43 (gain adjustment circuit 44), and therefore The first echo of the
sound signal becomes an echo that is attenuated only by the gain adjustment circuit 44
compared to the original, and the second echo enters the other gain adjustment circuit 45 before
the mixer 42 and the delay circuit 43. Since the signal passes through the gain adjustment circuit
44 and reaches the mixer 41, the signal is further delayed in time and greatly attenuated as
compared with the signal of the first shot.
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. Also, if echo is not required, the control terminal
44. The gain of the circuit 44 may be set to zero by the control signal to a. 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 12 of the surround. Therefore, a complex reverberation
sound is reproduced from the center speaker 12, 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. The tone adjustment circuit 5 attenuates high frequency
components of the output signal from the echo circuit 4.4 ?, for example, adds components of
10 KHz or more, or components of other frequencies or more to the addition / subtraction circuit
6 without cutting at all. 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 ?- ? and ? = 1, the signal is inverted and the channel is inverted like -R. The
components are obtained separately. With the above-mentioned speakers 12 to 14 on the
surround side, L-channel sound from the side and L-channel sound are reflected in the hall, and
indirect sound that has undergone various deformations in phase, time, level, route and
frequency It is reproduced as a pseudo sound. And since the speakers 12-14 of a surround
become the installation position from the top of the headrest 23 thru | or the upper back, the
advancing direction of the sound emitted from the side speaker 10.11, and the speakers 12-14 of
a surround The traveling direction of the sound to be emitted intersects with or near the head
rest 23 so as to be substantially orthogonal.
Therefore, for a listener who sits in the chair 20 and places his head on the headrest 23, 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. FIG. 3 shows another embodiment, in which the
above-mentioned speakers 10 to 14 are incorporated in the above-described positional
relationship into the speaker holder 30 having a U-shaped cross section and closed on both sides
in the longitudinal direction (lateral direction). Thus, the upper portion of the backrest portion 41
of the chair 40 is detachably fitted, and the same operation and effect as in the case of FIG. 2
described above can be obtained. The shape of the speaker holder 30 may be simply that of a
horseshoe, and in this case, the left and right speakers 10.11 are attached to the sheath portion,
and a bracket extending upward from there is provided. The surround speakers 12 to 14 may be
attached. Further, the metal fitting may be in the form of a closed square, and the surround
speakers 12 to 14 may be attached to the upper piece thereof, and the respective speakers 10.11
of the left and right pieces may be attached to them. In addition to the above, even if the
speakers are incorporated in a stand (not shown) in the same positional relationship as described
above, the same function and effect can be obtained. [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.
Brief description of the drawings
FIG. 1 is a circuit diagram of an acoustic reproduction circuit according to an embodiment of the
present invention, FIG. 2 is a perspective view of a chair showing an example of a speaker
arrangement according to this embodiment, and FIG. 3 is a perspective view of a speaker holder
according to another embodiment. FIG.
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 10. 11. Side speakers 12 to 14 Speakers for surround 20 Chairs 30 ...
Speaker holder, 40: Chair. Agent Patent attorney Toshiaki Nagao Fig. 0
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