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JPS54123902

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DESCRIPTION JPS54123902
Description 1 and title of the invention Stereo playback device 2 channel stereo playback device,
a mixer for mixing branched signals of each channel, and a plurality of delayed signals delayed
for a predetermined time from the mixed signals Delay circuits, and a few (at least one phase
shifter and level setter for dividing each of the delayed signals into a pair of signals having a
predetermined phase difference and level ratio, and each delay Of the plurality of pairs of signals
obtained corresponding to the signals, an adder which adds together with one input signal one
by one with each other in a predetermined combination and sets it as an output signal of two
channels, and is delayed A stereo playback apparatus characterized in that a signal having a
phase and a level set is heard as a pseudo indirect sound.
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to a stereo reproduction
apparatus, and more particularly to a reproduction apparatus capable of providing an effective
sense of expansion in the sense of hearing even if 2 channel stereo reproduction is performed in
a narrow room. About. "Conventional 2-channel stereo reproduction is performed in a narrow
room, such as a room with 45 tatami or 6f, etc., the distance between the speaker and the listener
is short, and the speaker is placed close to the side wall etc. The time difference between the
direct sound from the speaker and the initial indirect sound is small, and the sense of the sound
field is limited by the size of the room to be reproduced. Conventionally, as a means to increase
the sense of expansion, a signal passing through a reverb unit using a spring, using a delay
device, using a carcible filter or the like, or an echo unit using a magnetic tape or Tisif 1-7 There
was a method etc. to appropriately distribute to the left and right channels. In these methods, the
sense of direction of the reverb sound is indeterminate and the localization of the original sound
(direct sound) is made clear, or the arrival directions of the reverb sound and the echo sound are
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limited between the left and right speakers, There was a deficiency such as a lack of sufficient
feeling of expansion. In the present invention, this point Kai has not been found, and EndPage: A
pseudo-connected sound coming from a fixed direction is completed, and the time difference
sound between the direct sound and the initial indirect sound is enlarged to make it narrow. A
sense of sound localization of the original sound, even if played in the room? Do you lose it? (A
stereo playback device that enhances the sense of space expansion in the sound field? It is
provided. In the following, the conventional stereo reproduction system will be described once
with reference to FIG. 1 [, then, the principle and the embodiment of the present invention will be
described with reference to the drawings. FIG. 1 is a view for explaining the case of performing
the conventional 2-channel stereo reproduction in a narrow room V. As shown in FIG. 1, when Rchannel and R-channel reproduction are heard at the listener P, for the sound whose sound
image is localized at point 3, the wall of the listening room is also used for the initial pseudosound. Because of this, all the sound coming back is detected. Student-? The time difference
between the direct sound and the initial indirect sound corresponds to the difference between
the route a and the route b to the point ip, and the route b to the point p, or the route a and the
route C. It is difficult to make it 810 m5et or more. Therefore, the spatial expansion of the sound
field is limited by the size of the room to be reproduced. FIG. 2 is a diagram for explaining the
case where the 2-channel stereo reproduction of the present invention is performed in a narrow
room.
R channel and R channel speakers from Tang P for conventional 2-channel stereo reproduction.
It is well known that the sound gIt can be localized in the range of the angle 2? to see. It is also
known that it is possible to control the level difference and phase difference of the KR channel
and R channel to predetermined values, and to localize the sound gI to the direct product
direction. The principle of the present invention is as follows. That is, the sound is localized in the
range of the angle 2? by the mouth contact sound reproduced from the speaker. Furthermore,
by mixing the time-delayed R channel and R channel mixed signals with respect to the direct
sound into a pair of signals each having a predetermined level difference and phase difference
from each other, the signals are distributed to both channels and channels. Indirect sound
coming from a predetermined direction is generated, and superimposed on the direct sound [,
and reproduced. This principle will be described concretely. It is necessary to satisfy the
following conditions in order to sweet-acid the pseudo indirect sound reflected by the virtual wall
B in FIG. That is, if the sound pressure at the left and right outer ear inlets of the 11 listeners is
PLwPR, the artificial indirect sound is 1 That the original sound (direct sound) is delayed by [,
and ?. 2. To add a signal to the speaker that satisfies the condition that the direction of arrival is
-?, 2, Pt, and -9. It is necessary to meet the conditions of. The first condition is not a problem if
the double length obtained by delaying the original sound by .tau.1 is used as the pseudo indirect
sound. Use the following relationship to satisfy the second condition. That is, the relationship
between the direction of arrival of the sound sensed by the listener and the wind noise EEPLIP at
the entrance to the left and right ear canal of the listener has been experimentally obtained and
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known. On the other hand, the relationship between PL and PR and the signal to be added to the
speaker is given by the following equation. Assuming that the signals applied to the left and right
speakers are ? x-exp (j?), 1 ░, the amplitude ratio between the X and left speaker signals is ?,
and the phase difference is ?. At this time, therefore, the amplitude ratio X and the phase
difference ? of the signal applied to the speaker are PL + Pij corresponding to the arrival
direction of the predetermined sound, and the values converted according to the equation (21).
Partly, by giving two signals of the amplitude ratio X and the phase difference ? to the left and
right speakers, PL and PR are determined by the equations (1) and (21), and the arrival direction
-? is determined. FIG. 3 shows an embodiment of the present invention. The input signals of the
left and right channels are mixed by the adder (1), and this mixed signal is delayed by .tau.1 by
the delay circuit (2) K, and EndPage: 2 is delayed, so that the path differences a and b in FIG. (Ii:
the output of delay circuit (2) is different from PL, PR as described above by phase shifters (3),
(4) and level setter f5), (61, respectively) The phase difference ? obtained from the equations +)
and +2) and the amplitude ratio X1 are divided into two signs.
Similarly, the mixed signal of the left and right channels mixed by the adder (1) is delayed by ?
by the delay circuit (7), and the time difference due to the difference between the path
differences a and C in FIG. The output of the delay circuit (7) is determined by the phase shifters
(8), (9) and the level setter (10), and the fill as shown in equation (11, (2)) from KPL and PR as
described above. It can be divided into two components of phase difference, ?, and amplitude
ratio X. A signal whose phase is advanced from the above-mentioned signals by delay time ? and
a signal whose phase is delayed by delay time ?, and a signal whose phase is delayed by delay
time ?, and a signal whose phase is delayed by delay time ?2 are respectively Adder (IZ, add at
[131. Further, these pseudo indirect signal is added to the adder 141. (Add the signals of both
left and right channels by 151 respectively. When the signals of these left and right both-hands
yanonels are converted into sound energy by the Sbi kata Kocho 54-423902 + 31 7 completely,
the original sound is not disturbed by the pseudo indirect sound (eg, in the position between the
two speakers The artificial indirect sound with time delay of localization ? is heard from the
direction of virtual wall B of -?, ?. The artificial indirect sound from the time delay of is heard
from the direction of the virtual wall C of the weir. Further, the depth of the soundness I is
determined to a misery position determined from the direction and time difference between the
direct sound and the indirect sound as viewed from the listening position P. Therefore, according
to this method, the sense of depth also becomes thick (as well as the sense of sound spread). That
is, according to this structure, as shown in FIG. 2, the equivalent pseudo-initial indirect sound
coming from an angle of 1 from the median plane with a time delay of .tau.1 with respect to the
direct sound has a path difference corresponding to .tau.1. For the path a, the sound emitted
from JI along the path bK is reflected by the virtual wall B and is perceived as having arrived at
the listening point P. Similarly, with respect to the direct sound, the isometric indirect sound
coming from an angle of ? from the median plane with a time delay of ?, with a path difference
corresponding to ?, ie, along path C for path a The sound emitted from the point drilling is
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reflected by the virtual wall C, and it is perceived as having arrived at the listening table P. Here,
the adders [12], t131 and (141, t151 are divided for explanation, but it is better to add the input
signals from the adders' 121 and 13K. The relationship between the direction of arrival of sound
and the search sound pressure PL + Pjl is not unique depending on the frequency. Therefore, in
order to generate the indirect sound field precisely, the delay 1. It is necessary to divide the
signal into a plurality of frequency bands and to set all phases and levels for each of them.
FIG. 4 is a block diagram showing another embodiment of the present invention, wherein for
direct sound, each of ? 3. With respect to the median plane, each has a time delay of ?, and ?1. The pairing of the left and right primary indirect sounds coming from the angle of ?,
sweetening and reproducing them superimposed on the IM close sound is the same as the
embodiment of FIG. 3, but by using the band division filter High precision deposit money. That is,
a 2-channel source-a signal obtained by mixing the R signal and L signal sent from the direct
signal, the R channel and the L channel by the adder (1), respectively, is transmitted through the
delay device (2) t-time ?, The time ? for the signal 'directly through the delayed signal and also
through the delay device 1 (3). Separate into delayed signals. The signal delayed by time ?1 is
divided into three frequency bands by passing the filter ue, [17+, 1181]. The signal is further
divided into three frequency bands and delayed by time ?1 respectively, and the two
components of the R component are respectively phase shifters us, ?, cl! and (2) of the
attenuator. Through (d), the other through attenuators (c), (b) and b, respectively, control the
level difference and phase difference of RFli. At this time, the control of the level difference and
the phase difference between the two relates to the central station wave number of each divided
frequency band. And the predetermined angle-? ?, it is made to arrive with predetermined level
attenuation. Similarly, the signal delayed at time ? is divided into three frequency bands by
passing filters @, @, (d), divided into two parts of L and R @ respectively, one of which is a phase
shifter. C31), through (d), (d) and attenuator (2), (d), (d), the other through attenuator C (7)
respectively. Control the level difference and phase difference of both channels through (d) and
(d). That is, EndPage: 3 control 1 [l of level difference and phase difference between the two is
performed so as to arrive at a predetermined angle ? ? and a predetermined level attenuated
with respect to the center frequency of each divided frequency band. At this time, it is sufficient
to divide the same wave number band into three or four bands. As shown in the embodiment of
FIG. 3 and FIG. 4 above, the R channel and L channel signals are controlled respectively, and the
direct sound and the direct sound have an angle of 2 with respect to the direct tube and a time
delay tube having an angle with respect to the median plane. Indirect sound arriving from the ?
? 1 direction and ? with a time delay of 1 with respect to the L1 median plane, and indirect
sound arriving from the direction of the angle ? can be superimposed and reproduced. ? and
?! Is usually in the range of 10 m.sup.5 ec (.tau., <.Tau.t <80 m.sup.5 ee), and .zeta. And .zeta.,
Preferably in the vicinity of 55.degree.
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4
The turtle 5 is a block diagram showing another embodiment of the present invention, and ? 3
for direct sound. With a time delay of ?, with respect to the median plane, each ??1.? ? ? 8
? ? 8 with respect to the median plane with a left-right pair of primary indirect sounds coming
from the angle of ? ? ? ?, and a subsequent time delay of ? 3 ? ..... tau n respectively. ? 4.
ииииииииии (n-2) other pseudo indirect sounds coming from the angle of ? n wIli! t, 7 indicates that the
sound is reproduced superimposed on the direct sound. Normally direct sound pairs [, each ? 1.
With time delay ? ?, with respect to the median plane, each -?0. Even with the addition of a
pair of left and right primary anomalous tones coming from the angle of ?, it is quite equivalent
to the effect of the sense of spread in space, but adding an inter- Buddha anomalous sound to #
of K (n-2) ?By this, it is possible to enhance the fineness of the reproduction sound and the
spatial three-dimensional effect. According to the experimental results, the indirect sound
arriving from the median direction always has a sensibility that deteriorates the sound field, and
it is preferable to set 1?I> 30 ░. Therefore, it is necessary to control the (n-1) pieces of
reflected sound to come from a predetermined angle within the range of 30 ░ <? <90 ░. As
described above, even when reproduction is performed in a narrow room by the stereo
reproduction method of the present invention, the feeling of expanding the sound field in the
space is enhanced so that the feeling of localization of the actual sound image is not impaired. it
can. At this time, it is desirable that the 9111 wall of the narrow room that makes the sound In
be made of a material having a large acoustic absorption in order to make a reflection by the
actual wall. By doing this, the effect of the present invention is further enhanced. In addition, the
reproduction method of the present invention is applied to 4-channel reproduction [a pseudoindirect sound coming from behind can also be reproduced, so the sense of space expansion in
the sound field can be made more desirable.
4. Brief description of the drawings. FIG. 1 is a view for explaining the size of a conventional twochannel stereo reproduction in a narrow room, and FIG. 2 is a two-channel stereo reproduction
according to an embodiment of the present invention. Fig. 3 is a block diagram showing the
configuration f of one embodiment of the present invention, and Fig. 4 is a block showing the
configuration of another embodiment of the present invention. FIG. 4 is a block diagram showing
the structure Fli of another embodiment of the present invention, and FIG. 5 is a block diagram
showing the configuration of still another embodiment of the present invention. 1.1 ', 13, 14.15
... adder 2.7 ... delay device 3.4.8.9.19. ? O, 'l, 31.32.33 и и и Phase shifter 5.6.10.11 и и и Level
setting device 16.17.18.28. 4' 9. 30 и и и frequency band division filter 22, ? 3.24, '5. :) 6. :
'7.34.35.3.36.37.38 ... Attenuator 4 o-h Chanolusheika 41, ..., L Channerunnubika (7317)
Attorney General's Attorney General's Constituency (One other person ) EndPage: 4 Figure 1!
Figure 2. ????????????? ?
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