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JPS5442101

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DESCRIPTION JPS5442101
Description 1, title of the invention
Three-dimensional sound field expansion device
Generally, localization of a sound image in the case of forming a three-dimensional sound field
(stereo sound field) by two speakers (reproduction sound source) and listening is performed only
within the plane surrounded by the two speakers described above It is possible, and the listener
can not feel the sound W localized outside the two speakers. Therefore, if the spacing between
the two speakers arranged to form a stereo sound field can not be made wide for some reason,
for example, the state of the listening room or the speakers may be three-dimensional sound
reproduction equipment * (stereo regeneration device) In such a case, the range of sound image
localization in the stereo sound field formed by the two speakers becomes narrow in such a case,
but in such a case, it is possible to actually enter one space. Position of the speaker placed in I! If
the sound image can be localized outside t, it is convenient because the listener in the
reproduction sound field can obtain a three-dimensional sound feeling that is larger than the
three-dimensional sound sensation that should be originally obtained by the aspect of the actual
speaker arrangement. There is also a case where, for each channel signal of 2-channel
stereophonic sound system (2-channel stereo system), the method as practiced in the sound
image localization apparatus is used to expand the stereoscopic sound field In an attempt to
apply the sound image localization apparatus to the applicant company, the signal of each
channel in the two-channel stereophonic sound signal (two-channel stereo signal) is used as an
individual input signal, The sound image is localized in the direction intended by the listener for
localization for each of the input signals of A signal type IIO signal similar to the output signal
from the sound image localization setting circuit portion consisting of two sets of signal
conversion devices and the above-mentioned sound image localization setting circuit portion is
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formed by a plurality of speakers arranged in the entire cabinet The output signal from the
setting circuit portion of the sound image localization is a signal such that crosstalk to be
generated in the reproduction sound field has been canceled in advance so as to be given as a
binaural signal of a listener in the reproduction sound field. Japanese Patent Application No. 5120098 discloses a three-dimensional sound field expanding apparatus having a configuration in
which circuit parts for converting into signals of form are connected in cascade. FIG. 1 is a block
diagram of one embodiment of the above-described proposed three-dimensional sound field
enlarging apparatus SK of the applicant company described above, and in this FIG. (Sx is a circuit
portion Sx チ ャ ン ネ ル (hereinafter referred to as crosstalk elimination) for eliminating
crosstalk occurring in the reproduction sound field beforehand. Circuit part 8x!
3) connected in cascade to form a three-dimensional sound field expanding device, and 6.4 is an
output terminal. The setting circuit portion 1 of the sound image localization localizes the sound
image in the direction intended by the listener to localize EndPage: 2 for each channel signal not
individually input to the input terminal 1 ° 2. Are formed by two sets of signal conversion
circuits 5 and 6 for converting signals into five signals (pinaural signals), and the signal
conversion circuit 5 described above In addition, the signal conversion circuit 6 is configured to
include the portions of the blocks 8 and 10 to 12. In each of the blocks described above, blocks 8
and 11 are adders, and block 7.1 Ω is the beating in the diagram 2 and that of the listener M in
the virtual sound field formed by the virtual sound source indicated by BPrL. And the virtual
postscript BF! / A, transfer characteristic 厖 between 8PrL. And a circuit having a characteristic
corresponding to the transfer characteristic μ between each ear of the listener M and one of the
virtual sound sources in the vicinity of the listener M, and blocks 9 and 12 are received in the
virtual sound field. 69 in the circuit with the ratio (G) of the transfer characteristics between the
ears of the listener MO, ie, the listener's ears and the virtual f sources BXA, 8Pr8, and the
corresponding characteristics (#) The circuits 7, 10, 9.12 and the like having the respective
characteristics as described above are respectively constituted by a filter having a required
frequency response characteristic and a delay circuit (phase shift circuit) having a required time
delay characteristic and the like. . In addition, it mentioned above. In FIG. 2, SPr and 8Pt are two
speakers (reproduction sound source) disposed between the walls to form a reproduction sound
field, and A and B in one drawing are two speaker SPr, The transfer characteristics between BPt
and the listener's ears in the playback sound field are shown. The signal conversion circuit 5
indicated by block 5 in FIG. 1 causes the listener to localize the input signal (one of the two
channel stereo signals) supplied to the input terminal 1 in the reproduction sound field. A sound
image is localized in a direction intended, for example, in the direction of the temporary phase
sound source spn in FIG. 2, and converted into an expanded signal of the sound field as shown in
FIG. The signal conversion circuit 6 given to the talk removal circuit unit 2 and indicated by the
block 6 also receives the input signal 4j (the other channel signal of the two-channel stereo
signal) supplied to the input terminal 2 in the reproduction sound field. Convert the sound field
into an expanded signal of the sound field in which the sound image is localized in the direction
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intended by the listener in i and the intended direction, and give it to the crossover removal
circuit portion EXz .
The crosstalk elimination circuit portion SX2 is as shown in the figure with the subtractors 14,
18, respectively! It is constituted by each block 13, 16.15. 17 etc. having inertia. In FIG. 2, A and
B in FIG. 1 are the binaural listeners of the listener M and the reproduction sound source EfPr in
the reproduction sound field. It corresponds to A and B which show the transfer characteristic
between BPt. Also, T indicates a delay. The three-dimensional sound field enlarging apparatus SX
provided with the above-described first illustrated configuration supplies the output signals 8Prs
and BPtB to the two speakers SPr and SPt for forming the reproduction sound field from the
output terminals 6 and 4 At the same time, it is possible to give the listener M a feeling of threedimensional sound that causes the listener M to feel a sound image localized outside the
speakers SPr and SPY. Next, the above-described three-dimensional sound field expanding device
shown in FIG. It will be explained more specifically that the operation can be performed. As
shown in the first figure, the sound field expansion unit @FIX has the characteristics of the
setting circuit portion I of the 0th place of the tone control and the characteristics of the
crosstalk elimination circuit portion BXt, as described above. Since it is determined based on the
transfer characteristics between the listener's ears in the playback sound field, the input signal
supplied to the input terminals 1 and 2 is now 5 PtsL. 5PrBL, the output signal appearing at the
output terminal 3.4 is 5PtIl! The person of the three-dimensional sound field expansion
apparatus of the 1st illustration as 1 sprs. The relationship between the output signals is
determined as in the following equation (1), the binaural signal er of the listener V in the
reproduction sound field. ((1) and (2) above) (0) is obtained. This C equation is obtained by
looking at the loudspeakers 8Pr and BPLK4 in a narrow arrangement in the virtual sound field:
both ears 411 obtained by both ears of the listener and the output signals BPrs and BPIs of the
circuit arrangement shown in FIG. EndPage: 3 and 9 showing that the binaural signal obtained by
both ears of the listener V becomes equal, and therefore, the circuit arrangement of the
configuration as shown in FIG. 1 operates as a three-dimensional sound field expanding device It
is understood. However, the localization means of the sound image in the sound image
localization apparatus is an independent signal which originally does not have localization
information (for example, a monaural signal or an individual channel signal in a stereo signal,
another channel signal) Transmission characteristics between the position of the sound source
intended to be localized and the listener's both ears, and the speaker and the listener's both ears
in the reproduction sound field. By changing according to the transfer characteristic etc. between
them, to give the listener who is in the reproduction sound field a three-dimensional sound such
that the above-mentioned intended position (direction) K sound source is localized. Therefore,
even if the above-described three-dimensional sound field expanding apparatus is operated
according to the above-described operation mode of the sound image localization apparatus, that
is, the three-dimensional sound field expanding apparatus Input signal is input to only one of the
input terminals 1 and 2 Sk or only one of the two channels of the stereo signal of the 2-channel i-
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state In the case of a state where it is supplied as an input signal), good stereo sound field
expansion can be performed without any trouble, but it is possible to mutually When each
channel No. 11 of the stereo signal including the localization information in relation to the signal
content is input, the sound quality of the reproduced sound changes according to the localization
direction of the sound image, and an unnatural sound is felt to the listener. The undesirable
result of giving occurs.
This is also based on the premise that the localization means of the sound image in the sound
image localization device i is originally based on the fact that an independent signal having no
localization information is used as the original signal, as described above, In the above, the
double signal as the original signal that contains localization information by opening the signal
contents to each other is used as the original signal, and since the localization means of the
sound image is used, it is i When the device is used for the vk ratio, the deterioration of the
sound quality that occurs in the reproduced sound according to the direction of sound image
localization occurs when a signal of the same homology level is input to the input terminals 1
and 2, ie, the sound image in front of the listener It is most likely to be worn when a signal that is
localized is input, but in general, a sound image localized to the front of the listener, such as a
singer's voice, that is, a sound image localized to the center, is most Also regarded as important
Therefore, the sound quality of the sound image localized at the center of the reproduction sound
field changes to the sound quality as if the sound image is localized at a position shifted from the
center, as in the above-described conventional three-dimensional sound field expansion
apparatus. It is not preferable to have the problem of being unnatural to the listener. A more
specific description of this point is as follows. Now, it is assumed that the input signal BPraL,
BP9L-1) s is a signal day of the same homology level supplied to the input terminal 2.1 of the
three-dimensional sound field expansion device α which doubles the configuration of the first
illustration described above. In the case of 5PrsA = BPlsL == 8, the output signals 1jSPr and SPA
outputted to the output terminal 4.6 of the three-dimensional sound field expansion apparatus
@sx are expressed by the following equation (4): Show again. Once considering the sound quality
(frequency amplitude characteristics) of the reproduced sound from the above equation (4),
Tudomi · S · · · · (4) + B above, in the equation, T is a time delay, which is flat Transfer
characteristics A, which have suitable frequency response characteristics, but have (m ten B) and
(every ten) in equation (4) have a time difference from each other. Since the sum of B, A =, and s
is indicated, these (M unit B), (L + BL), and the like indicate different comb filter characteristics.
Therefore, in the conventional three-dimensional sound field expanding apparatus α, when the
input signal 8 of the same homology level is simultaneously supplied to the input terminals 2 and
1, the output signal has a ratio of two different comb filter characteristics with respect to the
input signal date. Therefore, when the signal S of four homologous levels is simultaneously
supplied to the power terminal 2, 1 only at the three-dimensional sound field expanding device
SX, it becomes equivalent to the one passed through the circuit having (-sweep: L 晟-). It is
obvious that the output signal date Pre = BPIs from the three-dimensional sound field expansion
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device 8K is of a worn and deteriorated sound quality.
EndPage: 4 So, in the applicant's company, the listener in the reproduction sound field formed by
a plurality of speakers using a 2-channel stereo signal as an input according to Japanese Patent
Application No. 51-27314, a speaker with a smile. The setting circuit portion of the sound image
localization and the crosstalk occurring in the reproduction sound field are previously made so
that a signal that can be felt by obtaining an enlarged three-dimensional sound feeling more than
a three-dimensional sound feeling that should be originally obtained can be output. In a threedimensional sound field expansion apparatus configured by cascade-connecting with a circuit
part for removing, as an input signal, only a signal of any one channel in a 2-channel stereo
signal is temporarily supplied When the sound source is in a direction intended to be localized by
the listener when the sound source is laughed, the binaural attachment obtained by the listener's
ears is substantially equal to the i ear In order that the lid can output an output signal that can be
obtained on both ears of the listener in the playback sound field, and in a state in which two
channels of the same-phase-oriented level are simultaneously supplied as input signals.
Sometimes, an integrated circuit between a person and an output terminal including a setting
circuit portion for sound image localization and a circuit portion for removing crosstalk
generated in the reproduction sound field beforehand so that an output signal equal to the input
signal is output. The present invention has provided a three-dimensional sound field enlarging
apparatus capable of satisfactorily solving the problems in the above-described conventional
example by determining the proper transfer characteristics K. FIG. 6 is a ten-square view of one
embodiment of the three-dimensional sound field enlarging apparatus sX previously proposed by
the applicant company as described above, and in FIG. The output terminal, which uses the
characteristic CM of the block 9.12 of the setting circuit A of the sound localization in the prior
art 3D sound field enlarging apparatus 匝 shown in FIG. 1 in this 3D sound field expanding
apparatus α Then, in the setting circuit portion SXl of the sound image localization, a
characteristic such as (XX + 1-) is made to perform compensation, and the characteristic of the
blocks 15 and 17 of the crosstalk elimination circuit portion day x2 is used. By making
characteristics of (m 十 B) with お i in the ス 4 stoke removal circuit part and performing
compensation, compensation by the charge-receiving characteristics such as (, FA,) in a
comprehensive manner between the input and output terminals Is given to the three-dimensional
sound field expansion device Arles in what was configured to. In FIG. 6, 19 to 22 are buffer
amplifiers, 25, 26, 66, tools, 27 to 60 are signed adders, and 23 and 24 are circuits with the
characteristics of (7F), 61.52 is (!! It is a circuit with the characteristic of -5 '.
Then, the input signal 8PrsL, 8 瓢-and the output signal of the three-dimensional sound field
expanding apparatus having the configuration shown in the above-mentioned o 6 are
simultaneously output to the input terminal 1.2. The output signal appearing at the output
terminals 5a and 4a when 8PlsL is supplied is equal to the input signal S as in the following
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equation (6). 8Prs = 5 pts = # · (m−B) ′ ′-(s) + (s +) s 8 e = 8− (6) Therefore, in the state
where the signal of the same homology level is supplied to the input terminals 1 and 2, the 26
illustrated already In the proposed three-dimensional sound field expansion device α, the input
signal and the output signal are equal, that is, the transfer function between the input and output
terminals is 1 and the frequency amplitude characteristic is flat and the sound quality of the
reproduced sound is completely lost There is no Note that the above-described person (in the 3D
sound field expanding apparatus shown in FIG. 6 performed according to the equation (0) and
the signal processing between the outputs and the person in the 1st illustrated sound field
expanding apparatus performed according to the equation (1) described above It is clear that the
signals between the outputs both give signals of the same relationship to the listener's ears. Tovl
This clear stereophonic field expansion device does not impair the localization of the soundness
even in this proposed stereophonic field expansion device. is there. As can be seen from the
above description, in the case of the stereo sound field enlargement apparatus of FIG. 1, the
stereo signal of the signal content is divided such that '3i required sound images are substantially
distributed to the left and right. It can be made to listen to the listener with good sound quality,
and a stereo signal of signal content such as that there is an important sound image in front of
the three-dimensional sound field expansion device shown in 1, t3. In such a case, it is possible to
make the listener hear the sound with good sound quality, as in the case of the program source
EndPage: 5 corresponding to the program source, but the program source is, for example, an
orchestra. In the case where the sound image of any part distributed over a wide range is
regarded as important as a rule, as in the stereo signal obtained by picking up the sound, it is
shown in FIGS. Like Although it is obvious that any of the body sound field expanding devices is
unsuitable, it is also possible that the sound quality of the sound image localized at places other
than both ends and the central part is regarded as important depending on the program source.
Even in such a case, the sound quality of the sound image regarded as important can not be
made good with the three-dimensional sound field enlarging apparatus as shown in the abovedescribed first illustration and t6 illustration. The present invention has been made to solve the
above-mentioned problems in the previously proposed three-dimensional sound field expansion
apparatus, and the specific contents will be clarified below with reference to the accompanying
drawings. , T4 and 5 are block diagrams of different embodiments of the three-dimensional
sound field enlarging apparatus 81y of the present invention, and in each figure, 1.2 is a 2channel stereo signal and each channel signal It .
The input terminals of lr, k, 4a are output signals 01 of each channel signal in the expanded twochannel signal of the sound field, the output terminals of Or, and the block l3X1y is a setting
circuit portion of sound image localization, plex [2y Is a circuit portion (crosstalk removing
circuit portion EIXzy) for removing in advance crosstalk occurring in the reproduction sound
field. In the three-dimensional sound field enlargement apparatus shown in FIG. 24, the sound
image localization setting circuit portion α 17 is a signed 2111 arithmetic unit 25-28, crosstalk
characteristics Bz L in an enlarged reproduction sound field (both a virtual sound source and a
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listener A circuit JJ26, 24 (hereinafter referred to as a circuit 26.24 having a characteristic
“I”), having characteristics substantially equal to the transmission characteristic layer between
the ear and the crosstalk characteristic of the reproduction sound field by the virtual sound
source indicated by BL. And the variable attenuator 651 and so on, and the input terminal IK, the
left channel input signal It in the applied 2-channel stereo signal, and the non-inverted input
terminal of the signed adder 27 The input signal 1r of the right channel in the 2-channel stereo
signal applied to the noninverting input terminal of the signed adder% and applied to the input
terminal 2 is a signed addition. It applied to the non-inverting input terminal 28 and a noninverting input terminal of the signed adder 25. The output signal Bt of the signed adder 27 is
applied to the inverted input terminal of the above-described signed adder 250 via the variable
attenuator, and the output signal of the signed adder 25 has 1L characteristics. Are applied to the
non-inverted input terminal of the A-signed adder 27 via a circuit 26 having Further, the output
signal Br of the signed adder 28 is supplied to the above-described signed adder 260 inverting
input terminal through the variable g table, and the output signal of the above-described signed
adder 26 is further provided. Is applied to the non-inverted input terminal of the signed force illmultiplier 28 through a circuit 24m having 1L characteristics. The transfer characteristic
between the person and the output of the setting circuit portion α17 of the sound image
localization described above is the following equation (7) with the input signal as It11r% output
signal as l, Br1 linked variable attenuators 35, 56 gain as Kl It is indicated as 2) The crosstalk
removing circuit portion 5X2y indicated by the block BXf17 is a circuit having a signed adder.
30, 53. 34, and a V & characteristic − substantially equal to the crosstalk characteristic T in the
reproduction sound field , 52, and variable attenuators 37, 38, etc., and the crosstalk elimination
circuit portion 8Xfy includes the circuit for setting the sound image localization [described
above]. The output signal U from the signed power calculator 27 and the output signal Br from
the signed adder 28 in 1y are supplied as the input signals Bt and Br of the respective channels,
and the input signal Bt described above #: Is applied to the noninverting input terminal of the
signed adder 29, and is applied to the noninverting input terminal of the signed adder 66
through the variable attenuator 67, and Signal Br, together applied to the non-inverting input
terminal between signed adder is provided to the non-inverting input terminal of the signed
adder '64 through between the variable attenuator.
The output signal 叶 of the signed adder 60 is given to the inverting input terminal of the abovementioned signed adder 66, and the opposite input terminal of the signed addition apparatus
described in the previous EndPage: 6 has a signed adder 29 An output signal 02 is supplied, and
the output signal of the above-described signed adder 36 is applied to the non-inverted input
terminal of the signed adder 29 through a circuit 61 having a T characteristic, and further, the
above-described signed addition The output signal of unit y is applied to the non-inverted input
terminal of the signed adder 60 through the circuit 32 having the T characteristic. The person of
the crosstalk elimination circuit part 8X27 mentioned above. The transfer characteristics
between the outputs are as follows for the input signal to the crosstalk elimination circuit part
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BX2y as TK, Br, the output signal O4, the gain of the variable attenuators 57, 68 interlocking
with the Or2 is 2 (and above) The equation (8) is transformed as the following equation (9).
Therefore, the person of the three-dimensional sound m enlargement apparatus Saki in the
fourth illustration, the output characteristic is the following (10) from the equation and the
equation (91) described above ) Is shown by the equation. (In the case of equation 10, in the case
of 2 = eO in K1 =, equation (11) is obtained as follows, and since A in the equation (11) is almost
equal to that in equation (11) When the condition of "M" is added to the equation, the equation
(11) becomes as the following equation (12). By the way, both ears of the listener M in the
playback sound field-qer. Although the relationship between et and the signals 5Pro and Sdi
supplied to the speakers SPr and SPt is as shown by the above-described equation (2), the
speaker signal in the equation (2) is the output signal Or of the three-dimensional sound field
expanding device , Ot, (The equation is shown by the following equation (2a). Substituting the
equation (1) into the equation (2a), the equation (2a) can be expressed as [t = 1 · (′ BH) − ′ ′
[巳 2] · [) 2] = 1 ==] 1 “T” (standby (16) equation is obtained, this equation (1 equation is the
input signal BPreL, 5PtBL and the binaural signal θr of the listener V in the three-dimensional
sound field enlarging apparatus of FIG. 1 6t, 6t In the three-dimensional sound field enlarging
apparatus shown in FIG. 4 (also in the fifth example shown in FIG. If the gain of the variable
attenuators 65 to 68 or 69, 40 is adjusted so that = Kj-0 (the circuit is disconnected in the
variable attenuators 35 to 68 or 39, 40), The three-dimensional sound field enlarging apparatus
shown in FIG. (And FIG. 5) is similar to the three-dimensional sound field enlarging apparatus
shown in FIG. Signal only is it possible to listener to listener Kamel's in a completely equal i
sound and when arranged speakers as if expanded position.
Also, in the case of adjusting the variable attenuator 35 to 閏 in the three-dimensional sound field
expanding device shown in FIG. 4 so that the snow becomes 1 together with its gain Kl (in the
three-dimensional sound field expanding device shown in FIG. The same applies to the variable
attenuator 59 and the gain 400 assuming that 1 (the equation (10) is K 1 and equation 1 in
equation (10)), and the following (1 It becomes. [5R = a 捨 -AJ "M 止 'n]" [' lz, l "'(") (14) is an
input signal 8PrsL, BP, tab and so on in the three-dimensional sound field enlarging apparatus
shown in FIG. It is similar to the previously described equation 0 which indicates the relationship
between the listener V's binaural signals er and f3L, and accordingly, the three-dimensional
sound field expanding apparatus 1t shown in FIG. The same applies to the field expansion
device), when the gain of variable attenuation 6 weak to 68 or 39, 40 is adjusted so that g1 = xK,
== 1, the three-dimensional sound field shown in FIG. 4 (and FIG. 5) The enlargement apparatus
operates as an i-three-dimensional-field expansion apparatus in which the sound quality does not
change when the signals of the respective channels are at the same homology level, like the
three-dimensional-field expansion apparatus illustrated in FIG. As mentioned above, tii gain of
variable attenuators 6 to 68, or 39, 40 so that K1 = 42 = 1. In the three-dimensional sound field
expansion apparatus made IE, the sound image of the signal of each channel is changed from the
original sound quality to the characteristic change like (]] 1r) and is heard by the listener as a
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mourning one, As described above, in the 9th embodiment, the variable tlt attenuator 槌 調整 or
69, the gain of 69, 40 is adjusted so that K1 = "2 = O, each channel EndPage: 7 The sound image
generated in front of the listener in the case of the signal of the same level is heard by the
listener as having a characteristic change such as that from the original sound quality to the OL
group rainbow) B. Therefore, if the gains of the four variable attenuators a to 68 in fEIXy are
simultaneously changed to O, or simultaneously changed to 1 in the fourth example shown in
FIG. As in the first embodiment of the three-dimensional sound field enlarging apparatus in the
first embodiment described above, in the case of emphasizing the sound quality of the sound
image of the signal of each channel only, and in the third embodiment of the third example. In
addition, it can be used as a two-dimensional three-dimensional sound field expansion apparatus
with the case of emphasizing the sound quality of the sound image of the front and reproducing
it. This point is the same as in the fifth embodiment, and in the third embodiment, the gain of two
variable attenuations @ 39 and 40 are simultaneously set to 0, or simultaneously at the same
time in the fifth embodiment. If it changes to 1 as one, one 3D sound field expansion apparatus
will be used both as the 1st illustrated sound field expansion apparatus and the 3rd illustrated
sound field expansion apparatus. .
Thus, to make all the variable attenuators in the three-dimensional sound field expansion device
have their gains both 0 and 1 together is switched in place of the variable attenuators 35 to
68.69, 40. It means that a switch may be used, and accordingly, the three-dimensional sound
field enlarging device of the present invention comprises the three-dimensional sound field
enlarging device of the first illustration shown above and the three-dimensional sound field
enlargement device of the third illustration. In the case where the apparatus can be implemented
as a dual-use one, a switch can be used instead of each variable attenuator in the apparatus, and
the three-dimensional sound field enlarging apparatus shown in FIGS. 4 and 5 can be configured.
It is as follows when the above-mentioned point is supplementarily described with reference to a
formula, a chart, etc. Setting the sound image localization setting circuit part 5Xty in the 4th
illustration of the sound field expansion device i / 18Xy Variable attenuation 6 words of 36, 1 is
1 in the gain of 36, sound field expansion in a state where the sound quality of the frontal sound
image does not change If the input signal 1r, It at the same homologous level corresponding to
the frontal sound image is represented by 8, then the equation (7) described above becomes the
following equation (15). The output power g in the setting circuit portion EIX17 is equal to the
above-mentioned equation (15a): Br = BzJ = 1r = lt (15a). Thus, it is apparent that the sound
quality of the frontal image does not change when K1 = 1. Next, when the sound field expansion
is performed in a state where the sound quality of the sound image of the signal of only each
channel is not changed as the gain Ktt-0 of the variable attenuators 35 and 36 of the setting
circuit portion 5X1y of the sound image localization. When an input signal 1r = + lL = 8
corresponding to the same sound level corresponding to the frontal sound image is added, 1−0
in the equation (7) described above, and summer r # t-8 *. The following equation (16) is
obtained. Warm + Le BA13r = = J14 = =-Chi-a = (1 + AA) '· "(16) Mur Fig. 6 shows the frequency
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response of (1 + 7) in (16) with the sound field expanded to just beside It is the curve figure
which showed the tendency of the characteristic. Also, the off figure is the crosstalk elimination
circuit part of the 3D sound field expansion device [! FIG. 10 is a curve diagram showing a
change of frequency characteristics with respect to a change of 2 in the variable attenuator 67 at
7 and the gain of the shell. Therefore, the sound quality of the frontal sound image
(frequencyless) when the sound field is expanded to just beside the sound quality of the sound
image of the signal of only each channel does not change. The tendency of the change of the
ponse characteristic is as shown by the curve in FIG. 28. Further, the signal of each channel when
the sound field is expanded to the side just like in the state where the sound quality of the frontal
sound image is not changed The tendency of the change in the sound quality of the sound image
is as shown by the curve in FIG.
Now, in the ordinary three-dimensional sound field expansion apparatus shown in FIG. 24, the
variable attenuators 65 to 68 are adjusted so that the gains of the variable attenuators 65 to 68
become O (K1 (1, 'O <Kg <1. In this case, an intermediate state between the state of 9WO and the
state of 2WO and the state of Ks = Kz = 1 can be obtained by the three-dimensional sound field
enlarging apparatus shown in FIG. That is, at the time of the three-dimensional sound field
enlargement apparatus shown in FIG. 4, the variable attenuator 35.1 in the setting circuit portion
5X1y of the sound image localization is selected. If the shame gain is continuously changed
between 1 and O, for example, the input signal It. The sound quality (frequency response
characteristics) of the sound image that is located in front of EndPage: 8 when lr is at the ceramic
homology level is a variable attenuator 65. It changes continuously from the flat A characteristic
in the state of 1 to the gain of '66 to the characteristic of (1 + Tr) in the state of gain Ks being 0,
and variable attenuation in the crosstalk elimination circuit portion aX2y When 2 is continuously
changed between 1 and O in the gain of the unit 67 ° 38, for example, the input signals Bt and
Br are at the same homology level, and the sound quality of the sound image localized to the
front (Frequency Response Characteristic) From the flat characteristic in the state of tf and K2 ++
= 1, the gain becomes 釆 in the state of 2 = O. Therefore, by setting the gain KlO value of the
variable attenuators 55 and 66 and the gain 2 of the variable attenuators 37 and 38 to an
appropriate value between 0 and 1, respectively, as a three-dimensional sound field expanding
apparatus Can be an intermediate sound quality between the extremes of those emphasizing the
sound quality of the sound image of the front and those emphasizing the sound quality of the
sound image of the signal of each channel only, as shown in FIG. The curve l1liI in Fig. 210,
which shows the characteristic curve diagram, is the sound quality (frequency response
characteristics) of the frontal sound image when the sound field is expanded to the side, and the
curve summer has the sound quality of the sound image for one channel input By setting the
values of the gains K1 and K1 of the variable attenuator to white, the music M1 shown in FIG. In
the case of single channel input as in ■, the change in the sound quality of the sound image and
the change in the sound quality of the front sound image can be modest, so that, for example, a
stereo signal like that of an orchestra It is also possible to obtain a suitable reproduction sound
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field for reproduction. The above-mentioned variable attenuators 65 to 68 are more detailed, and
it is possible to make the sound image of the front surface still more in consideration of the
whole localization, if 2 is made continuously variable for the gain Kl of each one. Set both KL and
2 close to 1 when emphasis is placed on, and set Ks and Kg close to O when emphasis is placed
on signals for each channel while taking into account the overall localization. Thus, a desired
reproduced sound field can be obtained.
The way of setting 2 to the gain K1 of the variable attenuators 35 to 68 mentioned above is
extremely depending on the state of the reproduction sound field to be obtained, but the variable
attenuators あ to 38 have 1 . The stream 9 may be configured such that 2 is switched in several
steps, or even one having a fixed value gain K1, K2 of a specific value between 0 and 1 may be
used. Good. Further, the method of combining the xt and xzO values and the method of
combining the variation modes in the case of intermediate sound quality as described above can
be determined by the designer's idea. For example, 1. As shown in t11, [+16! If two sets of
variable attenuators of the type that moves the sliders are juxtaposed, the Mffi two sets of
variable attenuator knobs 4 and 4 are moved in one, and the state of 2 in It is As it is, it is also
easy to use in conjunction with Kl = Cie O to Kl = Ks = 1, and also the state of Kl% Kl by shifting
the position of the two knobs according to the preference and source of the user In the
arrangement 1 aspect as shown in the 11th illustration of the kernel and the variable g of the
operation aspect, it is significant because reproduction sound fields of six different states can be
easily created if it is for a fallout device. Even in the entire circumference of the shaft 21g, as in
the case of the attenuator of the configuration as shown in the eleventh embodiment, it is
possible to create reproduction sound fields of various different states. FIG. 5 shows that the
variable attenuator 39 in the three-dimensional sound field enlarging apparatus shown in FIG. 4
is shared by one variable attenuator 39, and the variable attenuator 38 is one variable
attenuator. FIG. 20 is a block diagram of a three-dimensional sound field expansion device 5 xy−
of a configuration aspect that is shared by 40. In this three-dimensional sound field enlargement
apparatus 11Hy of t5 illustration, it is added to the already mentioned gain Kl! And are always
variable in the same state. Also in the sound field enlargement apparatus of the fifth embodiment
shown, the on / off operation is performed instead of the ff 1 K variable attenuator as in the case
of the third sound field enlargement apparatus of the fourth embodiment described above. It is
also possible to use a switch, use an arrangement which can switch in several steps, or use a
fixed resistor which can give a predetermined value of 9 Kl, Kg. It is As is apparent from the
detailed description above, EndPage: 9 in the three-dimensional sound field expansion apparatus
of the present invention, the sound quality of the sound image of the front does not change
according to the contents of the 4g The sound quality of the sound image can be set as desired
even before the sound quality of the sound image of the signal changes, and according to the
present invention, the optimum reproduction can be performed according to various program
sources. It is possible to easily provide a three-dimensional sound field enlargement apparatus
capable of allowing a listener to listen to reproduced sound in a three-dimensional sound field
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11
expanded in a state indicating a state.
4. Brief description of the drawings FIGS. 1 and 3 are block diagrams of the proposed threedimensional sound field expansion apparatus, FIG. 2 is an explanatory view of a reproduction
sound field, and FIG. 4 and FIG. FIG. 6 is a characteristic curve diagram for explanation, and FIG.
11 is an explanatory diagram showing an example of the arrangement configuration of the
variable reduction resistor. 1.2 ... input terminal 6, 4. h, 4a ... output terminal, 峯 ★ α 1.5 Xly ...
setting circuit part of sound image localization, α 2 2 EX 2 y ... four-stalk elimination circuit part,
SX, SXy ... 3D sound field enlargement apparatus, 25 50 to 36, 34. 34: Signed adder, L23, 24 A, a
circuit having characteristics, 51. 32: a circuit having τ characteristics, 35 to 40: variable
attenuator, 41 .42 ... knob, special applicant Nippon Victor Co., Ltd. EndPage: 10
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