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JPS4974801

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DESCRIPTION JPS4974801
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a layout diagram showing a speaker system of
a stereo reproduction apparatus according to an acoustic matrix to which the present invention
should be applied, FIG. 2 is a curve diagram showing reproduction frequency response of the
stereo reproduction apparatus 3 is a system diagram of an example of the stereo reproduction
apparatus, FIG. 4 is a connection diagram showing one specific example of the main part, and
FIGS. 5 and 6 are other stereophonic audio equipment and other sounds to be compared with
this. Fig. 7 is a system diagram of the experimental apparatus, Fig. 8 is a frequency characteristic
curve of the apparatus used in the experiment shown in Fig. 6, Fig. 7 is a system diagram of the
experimental apparatus, and Fig. The figure is a circuit connection diagram showing an example
of a stereo reproduction apparatus according to the present invention. SPLtSPFL and SPM are
respectively left, right and center speaker systems, 10 is a frequency characteristic compensation
circuit, 18 is a matrix circuit, j2 and j3 are auxiliary output terminals, and 20 is a releasing
means. FIG. 1 SPLIsPM Satoru IR 撞 one s -, ... "\ 's No. 1/1,' s ·, L-R, 'L + R / R-L /' \\\1 // '\17 /
\\\ I / ', / \ \ \ 1 \ \ \ \ \ \ \ \' \ ',' '', '' '' 7-1-1-49-74 sot (2) Figure 2-1 1 → 1 Hz Fig. 3 Fig. 4 L-----r-, 3b-2-49-7480 t (3) Fig. 5-3-49-4801 (4) No. 4 Fig. 6 Fig. 4 One open plate 49-74801 (5) Fig.
7 Fig. 8 (field) 0 0 O 5 -5 real open plate 49-74801 (6) = 6-
DETAILED DESCRIPTION OF THE INVENTION The present invention provides a difference signal
(L-P,) of left and right signals R and a difference signal (R-L) in the opposite phase to that to the
left and right speaker systems, respectively. Sound is emitted and supplied to the speaker system
at the center of the sum signal (L + FL) tube to emit sound, and the reproduced sound from each
of the speaker systems is acoustically matrixed in space, and the difference signal (LR And (R−L)
reproduction frequency response at low frequencies is greater than the reproduction level of the
sum signal (L + R), and higher at a reproduction signal than the sum signal (t, 10R). With regard
to the reproduction apparatus, the present invention proposes to use the auxiliary output
terminal connected to the head 7 particularly until the left and right signals with good separation
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between the left and right are obtained audibly when used. First, an acoustic matrix type stereo
reproduction apparatus with a large stereo feeling and a large sound spread proposed by the
present applicant before applying the present invention will be described with reference to the
drawings. (2) FIG. 1 shows a speaker system of a stereo reproduction apparatus. Speaker 8 PL
arranged on the left and right with respect to the note P, the difference signal (L−H,) between
the SPBK difference signal and the right signal R and the difference signal (R−L) between the
negative and the negative phase respectively And the central speaker SPMK sum signal (L + L) is
supplied to emit the sound, and the position P is expanded by the position of the left and right
speakers SPL, 5PfL. The sound on the left and right can be felt Ri, and the spread of sound can be
expanded. In this case, a relatively compact portable device, for example, is a stereo reproduction
device in which left and right speakers and a center speaker are housed in one common speaker
box, and a fist which can obtain a sufficient cover expansion can be obtained. And in this case.
Spread the ridge as much as possible and make the high frequency band more likely to be
stronger compared to the sum signal (L + R), and the difference signals (L-4) and □ that are
easily noticeable in the flat region (R−L) In order to correct its shortcomings and to improve the
balance t-n of auditory sound, the playback responses of difference signals (LR) and (RL)
reproduced from the spoofers SPL and sP □ on both sides respectively are used. (3) 2 As shown
in FIG. 1 curve a, in the low frequency range of the reproduction frequency, at least the
reproduction level (shown as a curve) of the sum signal (L + R) reproduced from the center
speaker is larger Is made smaller than the reproduction level of the sum signal (L + R). In FIG. 2,
the curve f shows the phases of the difference signals (L-R) and (R-L) with reference to the phase
of the sum signal (L + 8), and in this example, the difference signal is delayed in phase from the
sum signal. is there.
In the evening, take a peak tube of curve a at around 200 to 400 Hz. It is made to be the same
level as the sum signal at around 4 KHz. The frequency response shown in FIG. 2 shows the
electrical frequency characteristics of each of the signal transmission paths of the difference
signals (LR), (RL) and the sum signal (L + R). In all the examples of the FM radio signal shown, the
run difference signal (L-R), the sum signal (L + R) and the pie signal are obtained from the tuner
(1) including the intermediate frequency amplifier and the FM recovery device (2). The stereo
composite signal including the G signal is supplied to the input electrons T, T, K of the difference
signal system (3) and the sum signal system (4). The difference signal system (3) has a
subchannel (4) detector (3 副), a preamplifier (3b) having a frequency characteristic
compensation circuit, and a low frequency output amplifier (3C). The sum signal system (4)
comprises a low pass P wave device (4a), a pre-amplifier (4b) and a low frequency output
amplifier (4C). Curves a and b in FIG. 2 represent the electrical frequency characteristics leading
to the respective input terminals T, T, and the outputs of the low frequency amplifiers (3c) and
(4e). Thus, the frequency characteristic compensation circuit of the preamplifier (3b) of the
difference signal system (3) has an attenuation characteristic of, for example, an octave of -12 dB,
and the reproduction response of the difference signal is made high by the frequency
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compensation circuit. It is made to attenuate as it goes. Fig. 4 shows a specific example of the
preamplifier (3b) having this frequency characteristic compensation circuit (indicated by
reference symbol α 俤), and in this example, leads to the capacitor C + 'from the "lecter" of the
emitter grounded transistor Q. And amplified so as to lead out to the two-tube output terminal
T0, and connect a one-row circuit consisting of a capacitor C2 and a resistor R1 between the
output 1 T and ground. , A capacitor C3 is connected in parallel to the resistors R and K. In this
case, the transmission signal, that is, the bandits of the difference signal is emphasized, and the
high frequency attenuation toward the high frequency becomes remarkable, and is the frequency
characteristic of the entire difference signal system (3)? 2 as shown in curve a. Thus, the
difference signals (LR) and (RL) t-are respectively supplied to the left and right speaker systems
to emit sound, and the sum signal (L + R) is supplied to the central speaker system. In a stereo
reproduction apparatus that uses an acoustic matrix system that emits sound, the difference
between the difference signal -1 i [s] and the difference signal is greater in the low range than in
the sum signal, and in the high range is the sum signal. By making it smaller than the playback
level, 1 # can be made to clarify the sense of stereo. This is confirmed by the following
experiment. That is, as shown in FIGS. 5 and 16, a speaker box having about 35 scratches in
width d is disposed at approximately 40 to 50 o'clock apart 9 positions facing the listener P, and
the left and right speakers SPL are provided on both sides in this speaker box. And gPfL, center
speaker 8PM at the center, and oscillate a single frequency signal consisting of a low frequency
oscillator (5) as shown in the off view, through the first one button 1 button 81 in the middle (6)
The central speaker SPM is supplied, and the other part is connected to the phase reversal
switching circuit (7) through the amplifier + 31'gt through the reverse 4! !
The signal is supplied to the left and right speakers 8P and sp connected to each other, and the
signal from the oscillator (5) is emitted from the left and right speakers SPL and SPR in opposite
phase to each other. It is a book that measured how you felt the sound image. In the case of Fig.
5 as shown in Fig. 2, as shown in Fig. 6, the reproduction response 3 of the difference signal
system and the reproduction response 系 of the Japanese layer system may be the same as
shown in Fig. 8 It shows the Lj measurement result when the response a was taken larger than
the response 'Ib. In this case, one of the reproduced sounds from the left and right speakers SPL
and S′′B always has the same phase as the reproduced sound from the central speaker 8PM,
and a sound image is formed on the speaker side in the same phase. Therefore, assuming that the
left speaker SPL and the center speaker SPM are driven in phase, the listener P feels a sound
image on the left side, and conversely, the phase inversion switching circuit (7) drives the right
speaker SPR and center speaker SPM in phase. When the phase is reversed, the listener P senses
a sound image on the right. (7) In 矛 5 da and 16 臼 x indicates the position of the sound image
felt by listener P (hearing NR: I-examined about 20 people) when the sound image is formed on
the left @ for each frequency 12, the O mark indicates the sound image position & on the right
side, and the curve 、 represents a value obtained by connecting the average value of the sound
image position felt by each listener, as is apparent from FIGS. 5 and 16 < At 300H2 to IKHz, it
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was possible to obtain the result that many 聰 R people felt the spread of the sound widely.
Therefore, it is possible to give a sufficient stereo feeling. Qualitatively speaking, as apparent
from the measurement results in Fig. 5 and Fig. 16, if the reproduced sound exceeds 4 KHz, there
is almost no sense of similarity and the rate of feeling that the sound comes out from the center
(This means that it is a sound of 4 KHz or less as a sound range that gives a sense of stereo).
Therefore, by making the playback sound more than 4KH2 smaller than the playback level of the
center speaker instead, instead of making the sound range around 300 to 4 KHz that affects the
sense of 4 stereos larger than the playback level of the center speaker The positions of the left
and right sound images (8) are further clarified, and it is thought that it is a mourning thing that
makes it possible to feel the spread. Furthermore, if it is described in another way, since the
wavelength is long in the low range, both the left and right signals are collected and reproduced
with a phase nearly in phase. Therefore, the difference signals (L-R) and (R-L) should contain
almost no low signal. On the other hand, the reproduction output is sufficiently deviated in the
high range where the phase difference occurs even if the wavelength is short or the short
distance viewing (for example, the distance between the sound collecting microphones).
Therefore, when making the reproduction levels of the left and right speakers and the center
speaker approximately flat over all frequencies as shown in FIG. The fundamental playback levels
of the left and right speakers are shown by dotted line C in the figure (high range strong! As a
result, it is impossible to obtain the mining of sound because the tone range around 300 to 4
KHz, which most affects the sense of stereo, is hardly reproduced from the left and right
speakers. Moreover, in the difference signals (L-4) and (R, -L), distortion is likely to be noticeable
in the high region, which is not preferable from this point as well. Therefore, by enhancing the
left and right speaker O playback response in the low band and attenuating in the high band, the
tone range giving the sense of sloppy sound is reproduced sufficiently and the tone position
becomes clear. While the rate at which the spread of the sound is felt can be made, the balance of
the sound on the sense of hearing is improved. In the above description, although the FM radio
reception t11't-has been described by way of example, it is possible to obtain a difference signal
and a sum signal from a reproduction on a disc or a stereo reproduction signal from a tape
recorder and reproduce it in an acoustic matrix The same applies to the case. Also, the frequency
at the point where the reproduction level of the difference signal and that of the sum signal were
equal was taken at around 4 KHz, but it was experimentally confirmed that it should have a width
and be between 3 and 6 KHz. By the way, in the stereo reproduction apparatus as described
above, when the auxiliary output terminal is provided and it is 2 channels e 4 ", the left and right
speakers at the time of using it in the Ol 1 input auxiliary output terminal. And the difference
signals (L-R) and (R-L) and the sum signal (L-+-R) respectively supplied to the central speaker in a
main line to obtain left and right signals. In the above, there is a difference in frequency
characteristics as described above between the difference signals (L-4) and (R−L) and the
compensation symbol (L + R). Signal and right signal R can not be obtained. Zero-link i is made to
solve such a point. The present invention will be described in detail with reference to FIG. 9 tube
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according to one embodiment of the present invention, but in FIG. 9 the above-mentioned yp 3
figure and the part corresponding to the IF 5 figure are attached with the same reference
numerals. Do. Housing and υ are input terminals to which difference signal (L−R) and sum
signal (L + R) are supplied, respectively, and each emitter ground type of pre-amplifiers (3b, 4b)
is connected. The base of the transistor] is derived. The t amplifier (3b) has the same
configuration as that of FIG. The island is connected between the transistor Q1 and the power
supply + B and is a load resistor, R1 is a resistor connected between its emitter and the ground.
The connection point between the capacitors C1 and C2 is grounded through the variable
resistor R4Yt for the sound & agr; amount-node, and the intermediate movable terminal is
connected to the input side of the low frequency output amplifier (3c). For the other preamp (4b),
a. Is a load resistor connected between the collector of the transistor 1 and the power supply + B,
and the R province is a resistor connected to its emitter and ground. The collector of the
transistor 1 is connected to the capacitor C4 'and grounded through a variable resistor R @ for a
volume joint in series with this, and its middle movable terminal is connected to the input llI of
the low frequency output amplifier (4c) . The low frequency output amplifiers (3C) and (4C)
respectively output on the output side of the amplifier f131. Q4) is connected. Incidentally, (13a)
and (13b) are respectively a primary coil and a secondary coil of the transformer α 謙, and (141)
and (14b) are respectively a primary coil and a secondary coil of the transformer I. 3C), (4c) each
transformer 0, 0402 next coil (13b), (11b) resistance 11Ra, through Ret-through the negative
return circuit is formed, "(-and 2 The left coil and the right coil (Ia-force 8PL, 8PB) are connected
in parallel to the next coil (13b) via a jack with switch described later, and the left coil * 5PLK is a
difference signal (L-8), right Each of the speakers SPR is supplied with a difference signal (R-L).
Connected to the right-right speaker 5PFL is a polarity switching switch for switching the signal
O polarity so that a signal in phase with the left speaker SPL is supplied at seven arall. Further, a
central speaker SPM is connected to the secondary coil (14b) for feeding the transformer a via a
jack with a switch described later, and a sum signal (L + R) is supplied to this. 0 梯 is a matrix
circuit to obtain a left signal and a right signal R by adding a sum signal (L + R) tr to a difference
signal (L-8) and (l (−L) M ひ, and in this example, a resistor It is a resistance matrix circuit
consisting of R 糾 -FLIIs FLII and ate. Also, i and 1m are auxiliary output terminals (left output
terminal and right output terminal) to which left signal and right signal holes are supplied from
this matrix circuit, respectively, and in this example, a jack with a switch for turning on the stereo
head 7 It consists of J. Also, ▪ indicates the difference signal (LR) and (f!) Due to the frequency
characteristic compensation circuit 顛. L) A means for releasing the compensation of the
frequency from 1 to 1 → 1. In one example, the frequency-no-wave-number characteristic
compensation circuit (II is a frequency characteristic inverse compensation circuit that reversely
compensates the frequency characteristic compensation and cancels out).
In the jack J with switch, the t and ri common terminals are grounded. The both ends of the
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secondary coil (t3b) of the outgoing Kadriance ti3 are grounded through a resistor “+4” and
“R”, respectively, so as to float on the ground. Then, the left output terminal of the jack J is
connected to one end of the transformer (13) 02 secondary coil (13 b) through the matrix circuit
(resistor Rsst of 181) (the 1 fy3 person connected to the resistor FL blue) It is connected to one
end (non-grounded side) of the secondary coil of the transformer α を 通 じ て through ah. Also,
the right output terminal [, of the jack J, the resistor Rt * Yty of the matrix circuit OgJ! ! It is
connected to the other end (resistors R and I11) of the transformer (I secondary coil (13b)), and
through the same resistor R1 °, the secondary of the transformer Q41:-熾 (Ill (14b)) Connected
to the ungrounded side). In the jack J, SW and 8W are left and right switches respectively, 麿 is
its respective movable contact, b and c are its respective fixed contacts, and each movable
contact 1 is always the respective fixed contacts of α 接点 凌. When the plug of the stereo head
7 on is inserted into this jack J, the left and right output forceps t, 1. Each movable contact point
is switched to the fixed contact C side through an insulator cp (-). In the left switch SW, the
movable contact aFi ton Xa3tD secondary coil (13b) no Jilt (resistor FLr * III) K is connected, and
the fixed contact is common KII connected to each end of the left and right speakers SP series
and 8PH. The fixed contact C is a free contact. The left and right speakers SPL. SPB each other @
t; , The other end (resistor R, side) K of the 5 / X (11 t 2) 2 Kff 4 # (13 b) is connected. In the
right switch SW, the movable contact a is grounded, and is connected to one end (ungrounded @)
of the transformer (the secondary coil (14b) of 141) through the speaker SPM in the fixed
contact bH, and the fixed contact C has one frequency characteristic It is connected to the emitter
of the transistor Q of the preamp (3b) through a reverse compensation circuit. In this example, a
parallel circuit of a condenser C6 and a resistor R4α9 is connected in series to the condenser
fC3 in this frequency characteristic inverse compensation circuit 2. The frequency response of
the difference signals (L-4) and (R, -L) is formed as shown in FIG. 2 by the provision of the
frequency characteristic compensation circuit a 回路 in the preamplifier (3b). And the phase
characteristic thereof is formed as the curve true of the figure with respect to the sum signal (L +
R), but this frequency characteristic inverse compensation circuit 2 is formed of the abovementioned difference signals (LR) and (RR). It is a circuit which reversely compensates the
frequency compensation to make the same as the frequency response (Fig. 2b) of the sum signal
(L + R), and make its phase in phase with that of the sum signal (L +).
The operation of the stereo playback apparatus shown in FIG. 9 will now be described. When
stereo reproduction is performed using the speakers SPL-SPH and SPM ', each town-contact
amount of jack J12) switches sw and sw is in contact with one fixed contact point respectively, so
the left speaker SP The difference signal (LR) is supplied to the right speaker 8PR, and the sum
signal (L + M) is supplied to the center O speaker 8PM to the right speaker 8PR. One end is lifted
from the ground and becomes inactive, acoustic ma (Il! Trix stereo playback is performed. When
the stereo headphone is connected to the jack J, the switch SW, and each of the movable contacts
of the S horse contact three fixed contacts c [c], and the left and right speakers 8PL and 8PR are
disconnected from the transformer (from the first floor, While the central speaker SPM is
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disconnected from the transformer I, a frequency characteristic inverse compensation circuit is
connected between the emitter of the transistor Q1 of the preamplifier (3b) and the ground, and
the left and right signals are turned on when the stereo head 7 is turned on. , R is supplied and
regenerated. In the above example, the difference signal (L-1'L) (R? Although the frequency
characteristic inverse compensation port # & t-is provided as a releasing means for canceling the
compensation of the frequency characteristic of -L), the frequency characteristic compensation
circuit (IIK on-off switch may be provided. . This on / off switch is provided, for example, as
described above. When the feedback is connected to the auxiliary output terminal h1t of the jack,
the on / off switch is turned off to disconnect the frequency characteristic compensation circuit
O 呻 from the output side of the transistor q. αT Note that the left, right, and center speakers
8PL, 8PB and SPMd are not limited to one speaker each and may be a speaker system including a
plurality of speakers. In that case, the sound carrying area of the plurality of speakers of each
speaker system is It can be different. According to the present invention to be described above,
the difference signal (LR) of the left signal and the right signal R and the difference signal (1'L-L)
in the opposite phase thereto are supplied to the left and right speaker systems, respectively.
While emitting the sound, the sum signal (L + R) is supplied to the central speaker system to emit
the sound, and the reproduced sound from each of the speaker systems is acoustically mixed in
space, and the difference signal (L− The reproduction frequency response of R) and (R−T) is
taken larger than the reproduction level of the sum signal (L × R) in the low band, and smaller
than the reproduction level of the sum signal (L + R) in the high band It is possible to obtain good
left and right signals with good sense of separation on the aural sense when using it on an
auxiliary output terminal connected to a stereo reproduction apparatus such as a headphone.
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