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Description 1 In the invention, when an input signal is applied to the input side of either the left
channel or the right channel, the amplification degree is lower than that of the output signal from
the output side of the channel. A stereo sound field apparatus characterized in that the phase
difference is 180 degrees and a signal whose amplification degree and phase difference do not
change even if the frequency of the input signal is changed becomes an output signal from the
other output side. .
z4! Scope of claim
3. Detailed Description of the Invention The present invention listens to a near natural sound
field when it becomes necessary to bring the left and right speakers extremely close by
reproducing an unnatural signal sound intentionally during stereo signal reproduction. It is a
device for recording and playback in a manner as obtained above. In the conventional stereo
reproduction, the sound field is localized or moved within the distance between the left and right
speakers. Therefore, when the sound field is widely desired, the left and right speakers are
necessarily widely spaced, and the output is used to correct the volume. Was forced to However,
stereo listeners are limited in their space due to the installation location of the device, the shape
of the device, the combination of furniture and entrances, and other housing conditions. As a
result, the sound field becomes extremely small, resulting in an unsatisfactory reproduction
sound field close to monaural reproduction. As described above, when it is necessary to make the
distance between the left and right speakers inevitably smaller, by simply adding to the
conventional reproducing apparatus, the spatial crosstalk of the installation place is effectively
used, and the audibility is satisfied. To provide a sound field close to the sound level to the
listener 0 [If the listener has sound hearing function, level difference and phase difference in the
position of the left and right ears (more precisely, the ear canal population) Is an excellent
method of artificially creating these two types of information based on the assumption that “the
localization direction is determined by” and obtaining a wider sound field. However, these are
sound field expansion and localization under defined conditions, and also have the following
disadvantages. (1) The purpose is to obtain a further expanded sound field while obtaining a
fixed speaker interval to the last, and it is not assumed until the interval must be brought close
by necessity. 0 (2) Level difference and phase difference for each frequency As the localization
expansion close to nature is desired because of the difference between the two, it becomes an
apparatus that creates the level difference and the phase difference by many frequency divisions
and becomes more complicated. (3) The entire apparatus becomes large and the weight also
increases, which inevitably becomes expensive. (4) It requires technically advanced adjustments.
(5) A correction is required if the installation location is changed. (6) The conditions of the
installation place become a premise (to a high sound absorption characteristic etc.) to some
extent. (Γ) The listening position is very limited. (8) When already incorporated in any device,
the entire device has its performance and other devices (9) are inconvenient to move. で な い It
is not popular because it requires high technology, economy, various conditions, etc.
Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 shows
the state of the sound field configuration of space in conventional stereo signal reproduction. The
symbol {circle over (1)} represents the first signal sound reproduced from the left speaker, and
the symbol {circle over (2)} represents the first signal sound reproduced from the right speaker. ,
Is a synthetic sound produced and produced in space points one after another, and the numerical
value is a ratio of levels. For example, "2R + L" at the third stage from the top indicates a
synthesized signal sound at a certain spatial point, and is a signal sound newly synthesized by the
"L + R" and 1R1 signal sounds before that, and its level The ratio means right signal sound level:
left signal sound level-2 = 1. As a matter of course, it can be seen that the ratio of the level at the
front center position of the left and right speakers tqs is always 1 = 1 and the ratio of the signal
sound on one side to the signal sound on the other side increases as one position. In FIG. 1,
however, only a part of the innumerable points synthesized in the space is shown in plan view,
and there are innumerable combinations in the front, rear, left, right, upper and lower sides of
each equation. As described above, similar to the ripples on the water surface, both signal sounds
are combined one after another while moving in space, diffused and attenuated with distance,
and the degree of attenuation is "in inverse proportion to the square of the distance. FIG. 2 is a
view assuming that a certain moment is fixed in time, and the point is the left speaker, point R is
the position of the right speaker, C1 is the center point of the straight line connecting L and R,
straight lines C, L Or straight line 0. Assuming that the distance of H is r, the arc drawn from
each speaker with radius r is a curve La and a curve R, and for the straight line LH, the equation
is bracketed in FIG. Innumerable points corresponding to the enclosed portion (left and right
level ratio 1 = 1) exist in the On direction. In addition, the portion enclosed by the solid line in the
formula in FIG. 1 is the portion where the left and right level ratio is 2: 1, and the corresponding
position is 0 shown by the curve Lib curve Rib shown by a dotted line in FIG. If shown, the
positions of all points on the curve Rib are: right sound level: left sound level-2: 1, and as
described above, sound attenuation is "inversely proportional to the square of the distance", so it
is on R1b The distance between the arbitrary point P and the left and right speakers is D: R = 1:
JT. Next, when the center point is determined from the arcs of Lib and Rlb, the positions of the
center points L1 and Ri of the respective arcs are determined at distances of C4 to 3r on the
extension straight line AB connecting the left and right speakers.
If the movement of the actual sound is followed on the premise of the explanation of FIG. 1 and
FIG. 2 above, the signal sound reproduced from the left and right speakers is first synthesized
when going to the distance 11r and synthesized with the respective opposite side signal sounds
In other words, until just before that, only each signal sound is synthesized, and EndPage: 2 is
progressed with a change of attenuation only, and the spread of the left and right signal sound in
this state becomes curves La and R &. Therefore, the above mentioned Li'b and Rib, this La and
RI! If it is possible to make it close to the same condition of no composition 1 just before 1 like L,
the listener located on the straight line C1Cn will feel as if there are speakers in L1 and R2 The
sound field of the case would be five times larger for hearing. The pseudo sound field apparatus
which is the subject matter of the present invention is premised on this assumption, and as
shown in FIG. 1, the mathematical expression of the synthesis point on space which is
synthesized in various forms is used for the signal sound with phase difference. In the prior art,
the portion where the left and right signal sounds are spatially synthesized is made to be in the
state of the signal sound component zero 1 on the opposite side 1 to create a state close to the
sound field to be satisfied of the listener. First, taking the sound field expansion 6 times
described above as an example, the left signal sound is (left signal sound) + ((right signal sound,
but with a level of 16 dB and a phase difference of 180 degrees). As the signal sound, (right
signal sound) + (left signal sound, but level f ′ 1 to 6 (IB, phase difference: 1 B θ degree signal
sound) may be reproduced respectively. Is replaced by the equation, left signal sound = L + (-% R)
= L-% R (1) right signal sound-R + (-y2L) = R-% L. 2), and when each is reproduced from the left
and right speakers, the conventional 2: 1 part becomes a condition of no composition 1 until just
before 1 due to space crosstalk. That is, when the equations (1) and (2) described above are
substituted into the equation of the third stage from the top, which is a portion where the left /
right ratio is 2: 1 from FIG. (L-y 2 R) + (R-ML) = 5/2 L right side 2 R + L then 2 (R-ML) + (L-3 AR)3/2 R, the condition that the component of the opposite side sound is completely zero If the
equations (1) and (2) are substituted for the other 1: 1 parts in FIG. 1 as well, the pseudo-sound
field is further expanded by five times. The phase difference is the same <180 degrees and the
level difference should be 2/3 if the sound difference to be added to each is an equation such as
equations (1) and (2). Left signal sound = L-275R · · · (8) Right signal sound-R-2 / sL · · · · · · (4)
Inevitably, the level of the fifth step from the top first in Figure 1 As a result of spatial synthesis,
the part of the ratio 6: 2 becomes zero on the opposite side tonal component.
That is, when equations (8) and (4) are substituted into this, left @ 6L + 4R is b (L-2/3. R) +4 (R-2
/ 3L) = 10 / 3L Right side 6R + 4L is 6 (R-273L) +4 (L-2 / 3.L. R)=10/3. As Li and R1
calculated in the case of 6 times and R is calculated as in the case of 6 times, it is 5 times if the
expansion ratio of the pseudo sound field is calculated 0 0 like this one level difference is only
one point, only one phase difference is 180 degrees Sound field expansion becomes 0T ability
only by setting it, and it becomes theoretically possible to expand infinitely, but the practical
range that localization is also a certain degree is 1 to 5 times without losing sound quality It will
be the second place. Thus, by electrically combining a new signal whose phase difference is 180
degrees with respect to the main signal and the level difference is both limited to only one point,
the left and right signal sounds in space by reproducing it. Is re-synthesized, and at that time a
pseudo-sound expansion is made on the auditory sense. However, the problem in FIG. 2 is that
the curves Lib and Rib centered on the problem riLi and R do not intersect the center point C1 of
the straight line connecting the left and right speakers. Essentially, as a position on the
coordinates, what should have to be C, = Lc = R6 is three times as a result of expanding the sound
field by a factor of 3, and the points become lines. Assuming that the ratio of straight #LR of this
extended portion to CLroRo = 6r-4r5 with respect to the whole expanded sound field is expanded
to three times as much as about 5.7 bits of the whole audibility sound field is Although it is a part
of the central point of, if it is this ratio, it does not matter so much on the actual listening. As
described above, in order to use sound field expansion by utilizing spatial synthesis and EndPage:
3 it is necessary to electrically synthesize before that, but there are many methods that can be
considered. Shown in FIG. 4 and FIG. FIG. 3 utilizes phase inversion between input and output of
a transistor or the like. FIG. 4 is an example of use by a negative feedback circuit, which is
convenient for integrated circuits and the like. As described above at 4 °, according to the
pseudo sound field device of the present invention, the following effects can be obtained. (1)
Unavoidably, even if the left and right speakers are brought extremely close, as a result of use in
an average house, a sound field close to the case where the left and right speakers are installed at
both corners of a room can be obtained. Technically easy because the +21 device is extremely
simple. (8) The shape and weight are also extremely small. (4) It is extremely economical. (6)
There is no need to make adjustments even if the installation location is changed. (6) Not much
affected by the conditions of the installation site. (7) The listening position is not added very
(8) Extremely simple for any type of conventional stereo device (9) When a recorded material
recorded once using the device of the present invention is reproduced in stereo according to the
conventional method, the same sound field as reproduction by the device of the present
invention Get results. (101 This is popular because the whole device is extremely simple.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing the state of the sound field
configuration of space in conventional stereo signal reproduction. FIG. 2 is a plan view
representing the relationship between the distance and the level of the signal sound from the left
and right speakers. FIG. 5 is an electric circuit diagram using phase inversion by a transistor. FIG.
4 is an electric circuit of an application example of a negative feedback circuit. Lin · · · Right input
terminal Rin · · · Right input terminal LOut · · · Right output terminal R Out · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 2 Fig. 4 End Page: 4
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