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Patent Application Invention Title 1: +1. '(-Name researcher to National Research, Development,
51136 wholesale 7-Description-Japan Patent Office-JP 52-614030 published Japan 52. (1977)
5.20 Japanese Patent Application No. 51-136207 [phase] Application date ? 197, (197 l) /// /
2-Request for examination not yet filed (all 9 pages) Office internal reference number
'7346234,% claims Title of the invention according to paragraph 1.2 or 3 of the above
Patent applicant; R] 6))
The present invention relates to a sound reproducing apparatus, and more particularly to a
sound reproducing apparatus capable of identifying to a listener a sound from a sound source
spreading over an azimuth of 360 degrees. The inventions described in Japanese Patent
Application Nos. 47-12141 and 50-37386 have only two independent transmission channels and
listen to the sound from the sound source spreading over an azimuth of 360 [. The present
invention relates to a sound reproducing apparatus that can be identified by a person. In one of
these devices, one channel carries a so-called omnidirectional signal component that contains all
the sounds from the horizontal direction with equal gain, and the other channel has all the
sounds from the horizontal direction as gain. At (7), the corresponding omnidirectional signal
component transmits (3) an azimuth signal component, that is, a phase signal component
including a sound different in phase from the corresponding omnidirectional signal component,
and the phase difference is related to the azimuth arrival angle measured from a suitable
reference direction. Make it equal to that angle if possible. In other sound reproduction devices,
the signals carried on the two channels are a linear combination of omnidirectional and phase
signals). The phase signal P can be decomposed into components X and Y different in phase from
each other. In the case of sound in the direction of the azimuth angle ? from the front, the
localization is defined by the relationship: Here, W means an omnidirectional signal and Re
means "the real part of". Therefore, although the imaginary parts of X / W and Y / W hardly
contribute to localization of the sound, their imaginary parts make the acoustic signal have a
dismal character. The fugitive nature of this is what is commonly referred to as "Phainess J", and
it is difficult to localize and presents a wide image that can be heard very unnaturally. For a
particular orientation (4), it is known that the fuzziness of the signal from that orientation
becomes worse, such as the ratio between the imaginary part of Y / W and the real part becomes
large. An omnidirectional signal is a particular one of the certain signals that represent the sound
pressure signal available at the listening position. Similarly, the phase signal is a specific one of
the certain signals that use the sound velocity signal available at the same listening position as
described above. In the present invention, the signal W is an arbitrary signal representing the
sound pressure signal, , Y signals are arbitrary signals representing all quadrature components of
the sound velocity signal. The present invention relates to reducing the fuzziness of the mentally
important most important signal. Generally, those signals are from the front of the listener.
However, if a strong signal comes from a particular orientation at any given time, it is preferred
to reduce the fuzziness of that orientation and change the parameters of the decoding matrix as
the orientation of the most important acoustical change.
The present invention makes it possible to distinguish between a fuzzy-influenced decoder
EndPage: 2 having two or more channels and sounds generated from different heights, and a
third signal representing the third quadrature component of the sound velocity signal. It can be
applied to a decoder for a three-dimensional system having two. According to the invention, an
audio reproduction decoder having at least three speakers surrounding a listening location, an
input device for receiving at least two input signals comprising a pressure signal component and
a velocity signal component, A device for subtracting a directional bias signal including a signal
such that all components have a phase relationship related to a pressure signal component from
a velocity signal component in a selected direction, and an output signal for each speaker And an
output device for generating each of the sound reproduction decoders. The operation of
subtracting the signal component will be referred to as "directional bias operation" in this
specification. In general, if the selected direction is dominant or one of the most important
signals and the selected direction is forward, then the operation is called "forward deflection
operation" ? ? all significant sound sources, all dominant sound sources The present invention
determines such specific orientations from the input signal and compensates for the fuzziness of
the sound source located at those positions, such as when located at a certain orientation at any
given time An apparatus can be provided that provides a bias signal that is dependent on its
orientation. The pressure signal component may be an omnidirectional signal component ?, and
the velocity signal component may be a phase signal component. Thus, according to the
invention, the signals W, X, Y used to generate the output signal for a two channel input signal,
which require forward fuzziness compensation, are: Here, k is a positive constant between 0 and
1, preferably 1/3 and 1/2. ! Subtracting jklFin from the signal does not change the localization of
the sound at all, it is only a change in the sifagiinis by eliminating the imaginary part of X / V (7).
Of course, when P is negative, it should be understood that decreasing forward fuzziness
increases backward fuzziness. However, the fuzziness behind the listener is not
psychoacoustically important, and an overall improvement will be made.
Patent applicant; R] 6))
Hereinafter, the present invention will be described in detail with reference to the drawings. In
the following description referring to a set of phase shifting circuits performing different phase
shifting operations on different parallel channels, the phase shifting shown in each case is a
relative phase shifting, if desired, It should be understood that uniform additive phase shift can
be applied to all channels. Similarly, if it is indicated that certain gains are added to parallel
channels, then those gains are relative gains, and if desired, add a common overall gain to all
channels. Can.
Patent applicant; R] 6))
Before describing the present invention in detail, it is convenient to describe the basic
configuration of a decoder (hereinafter referred to as wxy decoder) suitable for use in a
rectangular speaker arrangement (8), so Make it The invention is applicable to any decoder of
this kind. Referring to FIG. 1, a listening S centering around point lO is surrounded by four
speakers H112, 13, 14 arranged in a rectangular shape. The straight line connecting the
speakers 11 and 12 and the point 10 respectively forms an equal angle ? with the direction of
the reference indicated by the arrow 15. The speaker 13 faces the speaker 11, and the speaker
14 faces the speaker 12, respectively. Therefore, assuming that the reference direction is the
front, the speakers are disposed at the left front position, the right front position,
the right rear position, and the left rear position, respectively. These four speakers 1] to 14 are
output signals from the decoder 16 LP, fl? , Receive RBXLB respectively. The decoder 16 has two
input terminals 17 ░ 18 and an omnidirectional input signal W 1 is applied to the terminal 17.
The phase signal p, is applied to the terminal 18. FIG. 2 shows a known WXY decoder suitable for
use as the decoder 16 at an angle ?-45 ░. EndPage: 3 This decoder is composed of wxy circuit
addition and four amplitude matrices. The wxy circuit 20 generates an output signal W
representative of pressure, an output signal X representative of a front-rear velocity, and an
output signal Y representative of a left-right velocity. The signals are applied to an amplitude
matrix 22 which produces the required output signals LB, LF, RFXRB with the amplitude matrix
received. Amplitude)) IJ ? ?? performs the following function of ?. LB,-,-(-1: + W + Y) LP,--(X +
W X Y) RF (-(X + W-Y) RB phantom-(-X X IF-Y) These four output signals LB% LP, RBl RIF The
generated decoder is equal to the WX7 circuit and the amplitude matrix for any decoder, so if-(-
LB + LP-RF x RB) = 0, a WXY decoder is configured. Two or more inputs can be provided to the
W or Y circuit field. In practice, this decoder is the same as the decoder described in the abovementioned British Patent Application No. 47-12141, and (i) the phase shift circuit functions as
the active part of the wxy circuit. An adder and an inverter function as an amplitude matrix.
The nature of the wxy circuit depends on the form of the input signal. As shown in the figure,
when the input signal is composed of an omnidirectional signal W1 and a phase signal P1 having
the same magnitude as that of the signal WI and a negative phase difference equal to the azimuth
angle, the output of the WXY circuit is It relates to the input signal as follows. FIG. 3 shows a
decoder similar to that shown in FIG. 2, forward biased according to the invention. This forward
biased decoder has a W) CY circuit U similar to the WXY circuit (a) except that it has an
additional JWY output terminal (11). The X and Y output terminals of this WXY circuit are
directly coupled to the input terminals of the amplitude matrix ? ? as before. It is connected to
the subtractor circuit via the jWY output terminal variable gain amplifier section, where the jV
ratio output is subtracted from the Y output of the wxy circuit ?. The Y output terminal of the
reduction X circuit is connected to the input terminal of the amplitude matrix ?. The gain of the
amplifier% is set to k. The value of k is a positive value between 0 and 1 as described above. It is
convenient to set k to 1 / -1 / 1 / when the W or Y circuit receives two input signals consisting of
an omnidirectional signal and a phase signal. Similar corrections can be made to any of the WXY
decoders described in Japanese Patent Application No. 50-37386 # 1. The jW times signal
subtraction from the Y signal can be performed at any convenient point between the WXY circuit
and the amplitude matrix. This subtraction is performed on the output signal from w5 (seven
circuits, but other arrangements are possible. For example, as shown in FIG. 4, the output
terminal of the IFXY circuit ? can be connected to the input terminal of each of the filter 12 and
the filter 12. As described in the patent document IIa, the shelf filter 31 for the W signal is a lff1
filter filter J), the shelf filter for the X and Y signals, and the recognition is an M-type shelf filter.
Shelf filter ? ulll for jW doubled signal! The shelf filter has the same matched phase response as
the S and C filter filters. Thereby, the constant k can be related to eight wave numbers so that the
remnantness of the seven azimuths can be controlled according to the sensitivity of the human
ear to the fuzziness at each frequency. However, by making the m-type shelf filter the same as
the In-shelf filter, the design of the device can be simplified and the manufacturing cost can be
reduced. In that case, the function of these two filters can be implemented with a single filter t1
operating on the W signal, with the 90 degree phase shift circuit used to generate a jW signal
from the output of this filter.
The outputs of the filters 30... ? 3 are applied to the layout control step and the distance
EndPage: 4 step substantially in the same manner as described in the patent application. The jWfold signal subtraction can also be performed at the output of at least one of the layout control
stage 34 or the distance control stage. However, in this case the fuzzy compensation will be
changed by their regulation. The application of the present invention is not limited to decoders
with omnidirectional input and phase input, but may be combined in two channels and with a
common type of other linear combinations. It can be considered as ((2) ?-jqatn?) times A. Here,
for each of the ?-encoded sound positions, q is a non-zero real constant. During encoding, ?
may be equal to the desired azimuthal angle, or it may be a function of that azimuthal angle. In
the decoding equation below, ? is the angle 1f11 heard after decoding! It is processed niji. The
decoder for these signals has the following formula:% formula%) where ? is a frequency-related
constant and k is a positive constant of 1 or less. The subtraction of kA from the signal Y is a
forward bias process performed in accordance with the invention to reduce the -A degree phase
shifted component of Y for sounds where ? is approximately zero. The value of ? in the above
equation for the approximately 350 Y signal not only reduces the acoustic fuzziness of the front,
but also increases the gain of the sound from the rear and lowers the gain of the sound from the
front. It is to be. This helps to compensate for the relative excess gain in front of the signal A1B
during encoding. There are several such cases of excessive forward gain. For example, the
present invention can be applied (15) to a two channel signal such that the two channel signals
are a direct combination of the signals C and D (possibly including a phase difference). Here, ? is
a non-zero constant, C has a gain (1 + ? ? ? 10 ? js m?), D is a gain (? 10 bit ?-jsh + ?),
and two signals have the same gain for all azimuths. And, just as in the case of omnidirectional
signal / phase signal coding, the signal is delayed by a phase angle ? from signal 0, but signal 0
does not have a constant signal with respect to angle, and its actual energy The gain is (1 + ? 22
? (2) ?) at azimuth g. If ? is positive, this gain is higher at the rear and at the front, processing
the signal C as an omnidirectional signal, processing the signal as a phase signal and forward
biasing to help equalize the gain during regeneration , And by reducing the fuzziness to the
sound from the front, those signals can be decoded.
The present invention can also be applied to a 3-channel system of a type where the quality of
the third channel is lower than that of the other two channels. For example, in a 3-channel
record, two high quality channels can be used as baseband channels, and a third channel can be
recorded using subcarriers. (16) In one three-channel system, the three signals sent are Win, P,
p% s, and signal P3 is such that its directional gain is a complex conjugate of that of P. The
respective gains at azimuth angle ? of these three signals are: (Ca! ?-jm?), (c 111! l? + j ?
?). The "ideal J" FXY circuit (without curved blade bias) for these three channels is found in the
following equation: Here, ? is a real constant related to frequency. This decoder does not
produce fuzziness but gives i requirements equal to the signals P ? and P. In order to reduce the
importance of the low quality signal P being assumed, the following types of decoders have been
proposed. W = Win X = ? (tp + (1-t) p ? Y-? (tjp-(1-t) jp) ice) EndPage: 5 The resulting decoder
is the full 3-channel decoder described above, and the t-1 Sometimes the decoder obtained is a 2
channel decoder. If desired, t can be varied with frequency. Since fuzziness occurs in this system,
the forward bias can be applied as follows to reduce the azimuth of the forward image as follows.
r-WinX-.beta. (tp + (1-t) p) Y.noteq..beta. (tjp- (1-t) jp-k (2t-1) jWin) An undesirable increase in
gain in the backward direction as well as in the forward direction Although the effect also occurs,
the magnitude of this effect is smaller than that of the 2-channel decoder. In the full 3-channel
system, there are signals other than jW whose phase shift amounts are lead degrees for all
azimuths. Any linear combination of the signal 3v, j (P + P draft) and (PP double) has the required
(i) degree phase shift. Thus, the 3-channel decoder is forward biased without affecting its base
image localization by adding any linear combination of the three types of signals of n et al. To X
and Y of the base decoder equation. it can. Such a bias does not necessarily have to be forward
(in which case it is not a forward bias), and can be used to change the decoder's gain in the same
direction as the others.
Several encoded signals allow all or all the sound sources to be placed in a specific orientation at
any desired time. In those cases, it may be desirable to add a bias signal to reduce the imaginary
part of the velocity signal component for that particular orientation. In more detail, for this
purpose it is possible to have a decoding equation such as: WmW1nX-= h (p + luwtn) Y = (JP +
jVWin) where r is a real constant relating to the frequency, u and v are (19) the estimated
distribution of the sound in the real encoded signal representing the gain Change according to If
it is inferred that all the sounds in the encoded signal are in the orientation ??, then the ideal
values of U and V are U cattle blood to cancel out the 9 ░ phase shifted components of the
signals X, Y. It is-(2) ? in ?V. Assuming that the overall tendency of the sound is directed to the
direction ? (but with accuracy measure 1, r is related to the spread from the direction ? of the
sound source) Uncertainty in the estimates of ? and r do not greatly affect the main results as
the boundaries that can be entered are obtained. The reason is that azimuth angles close to ?
are also decoded with relatively small fuzziness. Several methods for estimating ? and ? are
known, one of which will be described. FIG. 5 shows a vXx circuit incorporating variable bias
according to the invention to decode the signals win and JP (20). The Win signal is applied to the
0 degree phase shift circuit ? to generate the signal W and to the turbidity phase shift circuit &
to generate the signal join. Similarly, the phase signal JP is applied to the -LA degree phase
shifting circuit and to the 0 degree phase shifting circuit. The phase shift circuit diagram, the
output terminal of ? is connected to the X and Y output terminals of the WXY circuit via the
respective summing groups, ?. 6 additions, ? is used to add the required bias. ?? For the
purpose above, (2) ? and blood ? can be considered to be given by the following equations,
respectively. In fact, in the circuit shown in FIG. 5, where Kn (a) represents the envelope of
waveform 8, full power signal Win is added between the envelope detectors to produce signal IB
(Win). EndPage: 6 This signal is the denominator of the above equation. The signal In (Win + P) is
generated by the envelope detector ? receiving the output of the adder axis, and the signal In
(Win-P) is generated by the envelope detector 6 ? receiving the output of the subtraction 6
group .
The output of the envelope detector .omega.,-Is applied to a subtractor to generate (2) the
numerator for .phi., And the numerator of the kernel is divided by the divider 70 by the output of
the envelope detector. The output of divider 70 is multiplied by join in multiplier 72 to obtain the
required bias signal for the X output. This bias signal is applied to summer 60 via variable gain
amplifier 74. A bias signal for the X output can be obtained as well. Signal In (Win + JP) is
generated by envelope detector 16 receiving the output between the adders. Signal In (Win-jP) is
generated by envelope detection 6 ? ? receiving the output of subtractor &. The outputs of
these envelope detection detectors 76 and 76 are applied to a subtractor U, and the output
thereof is divided by the output of the envelope detection detector section by a divider 86. The
output of the divider d6 is multiplied by the output of the phase shifter & with six multipliers,
and the resulting bias signal is added between the adders via the amplifier 6. Thus, the bias
signal applied to the X, X output terminals of the circuit shown in FIG. 5 depends on the
orientation of the dominant sound represented by the encoded signals ln and P, and the
magnitude of the bias signal is Is related to the amplitude of the dominant signal as compared to
the amplitude of the signal from the other orientation. If sounds of equal strength 6 come from
widely different orientations such that there is no dominant signal, their outputs are zero since
the inputs to the subtraction 6 ?, 84 are equal. By adding the variable bias signal only to the Y
output of the WXY circuit and not to the X output, ie making U equal to zero, a simplified
variable shift decoder can be obtained. This increases at least one directionality of forward or
backward, but not lateral directionality. Directional bias signals can also be applied to speakers in
non-rectangular arrangements. For example, in a regular polygon arrangement, it is possible to
make the signal applied to each speaker l /. Here, X and Y are constants k greater than zero for
the velocity signal output of vxy times (23) path, and ? is the azimuth angle of the speaker
giving the signal. In terms, jW, k, jW are directional bias rings. The numbers kl, kt, k3, k can be
related to at least one of the frequency or the virtual instantaneous direction of the dominant
signal, but the others are real constants. The circuits necessary to implement such a polygon
decoder are: n outputs given by the formula% equation% in the form of the output amplitude
matrix & (arrangement 08 ... separated by 360 '/ n spacing) The difference from the decoders
shown in FIGS.
If a directional bias is applied to the three-dimensional system, the bias can add two components
of the signal, along with at least one of the x1Y components of the velocity signal or at a rate of
X, x @ .
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of the sound
reproduction system showing the arrangement of the loudspeakers in the listening position
range and their connection to the power of the loudspeaker, and FIG. 2 is a schematic of FIG. FIG.
3 is a block diagram of a known decoder suitable for use in the system shown in FIG. 1, FIG. 3 is
a block diagram of a decoder according to an embodiment of the present invention, and FIG. 3 is
a block diagram of a decoder according to another embodiment of the present invention. FIG. 5 is
a block diagram of a portion of a decoder according to a third embodiment of the present
invention. ? l ?14 14 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
WXY circuit, etc. и и и amplitude matrix, 26.74 и и и variable gain amplifier, 28. ... Subtractor, 3 o ?
иии Shelfiler, иииииииииииииииииииииии fEIJHR 13 B иии Distance control stage, group to group ииии Phase shifter, ?,
?, 78 иии Addition Divider. 8 Same Tsuruki 7-7 EndPage: List of 7 documents attached (1) 1
description (2) 1 drawing (3) Power of attorney and its translation 4! r 1 (4) Priority certificate
and + O translation 1 each inventor, patent applicant and agent 27 one EndPage: 9 Warning:
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