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2, inventor name '? i ? h 3.11' applicant address guard 'I city Keihan Hondori 2 chome 18
address name (188) Sanyo Electric Co., Ltd. Le Yuei address Lei County Gunma Prefecture Oizumi
Town Oizumi Sakata No. 180 Name Tokyo Wangio Electric Co. r1-Representative 'I' I contact ?
░ ::, X (?: j и) 8 (-, r-1111 endorsement: l: Q (4 '): (4' l? ? f4, list of added f? documents (1)
Description 1 pass 6 ? ? 4 7030540 ? Japanese Patent Office Open Patent Publication ?
Japanese Patent Laid-Open No. 48975020 Japanese Patent Publication 48. (1973) 12.12 within
the government ░ 4. "3 logical numbers ? ? Main classification 2 ? 23 / 69.4 j-specification /
title of the invention
Matrix production channel encoder
3. Detailed Description of the Invention The present invention relates to an encoder in a matrix
alternative stereo system in which three or more signals are converted into ? signals,
transmitted through two transmission systems, and reproduced again into one signal. In the
matrix alternative channel stereo system, an encoder that converts three or more original sound
signals into two signals, two transmission systems that transmit the two signals, and a
reproduction device that reproduces the two signals into another signal It consists of The present
invention relates to an encoder among them, and in particular, it is intended to obtain 111 ffiJ
signals which provide a good degree of separation of the reproduction apparatus output signal.
Also, the original sound signal may have any number of three or more, but the explanation is
limited to-only for the sake of simplicity. In general, when converting one original sound signal
into a ? signal, as shown in FIG. The vibration directions of the original sound signals are set to
be ? j degrees. Therefore before III! When ? signals are reproduced, the degree of separation
between adjacent channels of the output channels of the EndPage: 1 reproduction apparatus is
always J dB and does not increase any further. Although a part of the vibration direction may be
slightly wider than ? j degrees in order to make a correction on auditory sense, it is fixed
approximately at the above-mentioned angle. ?? When taken slightly wider than j degrees, the
degree of separation between the adjacent (adjacent adjacent channels increases, but the degree
of separation between the other one channel deteriorates. The encoder according to the
invention acts on the feed circuit in converting the original or original sound signal into two
signals, in order to increase the separation between the output channels of the? It is intended to
increase the degree of separation between all adjacent and adjacent output channels. Hereinafter,
an embodiment according to the present invention will be described with reference to the
drawings based on an embodiment of the present invention. FIG. 2 is a principle diagram of the
present invention, and FIG. 3 is a circuit diagram showing the details thereof. In FIG. 2, the
encoder, (, 21, Ltl, one example, and (51 is an input terminal, (A; is a reproduction device, (7) and
N)) is an operation input terminal (J1, (J1, stop, and The original sound signal (left front signal
(L,), right front signal (R,) left rear signal (LB input and right rear signal (RB)) applied to the Two
signals at 7+ and 121: And RTIIt occurs. The signals LT and RT are again transmitted to the
reproducing apparatus (4) (left front output signal a, ')% right front output signal (R,') left rear
output signal (LB), and right rear output signal ( Converted to R, ')).
It is a feature of the present invention that the above-mentioned signals are used to create ?
control signals, and the control signals are used to act on the encoder to improve the degree of
isolation. Two control signals ? and ? are defined as follows. Depending on the size of the
reference signal, l, /, ? 1 p 'e LB' ++ and RB ', in all cases, emphasize the larger level signal
among the If four signals, and other signals If we move the vector of, we can think of the
following conclusions about. [A] ?) In the case of O, ie, IL, 'I> IRB' 1, as shown in FIG. 7 [J], R and
LB of the basic vector diagram of FIG. ?. Move in the direction away from to suppress and once,
emphasize the signal. At this time, it indicates that the strongest signal is applied. If [mouth] ?)
Q, ie, 1??I ?> ILB ? ?, similarly, move in the direction away from ?Clyt? and 1 kg of RB as
shown in FIG. [Pz) el <Q, that is, IL, 'I <1 to' IIF4 (FIG. Is moved away from h in two directions: in
the case of power yt0 to [2] ? O O, ie, in the case of 1 '<ILB' 1 Figure 1 [L and RF 'B are moved
away from LB as shown in 2J. Further, it is assumed that ? original sound signals and R are
simultaneously applied to the left front channel and the right front channel. At that time, ?) Q,
?> 0, and L and R become as shown in FIG. FIG. 5 is the same representation method as FIGS. 1
and 2, but the whole is 340 degrees and the movement angle is doubled to make the explanation
clear. -As shown in FIG. 5, when ? dominant signals and R-a are simultaneously applied to the
input terminals, R, and LB in the encoder are dependent on each other. и Moved away from R 2, R
2 moves RB away from R, by R 1. If the angle of the movement is taken, in FIG. 5, it can be drawn
as if it moved '?O. At that time, the output L, ', RP' of the playback device. LB 'and RB' become
EndPage: 2V. In the case where the dominant signal is present in the formula (as apparent from
the publication, L and R7, the degree of separation between% L, 'and f%, I is as shown in the
following table. [Table l] Since the degree of separation when the logic circuit is not operated on
the encoder is -j dB, it is obvious that the degree of separation is improved when the logic circuit
is operated on the encoder.
Similarly, when LB and RB have dominant signals, LB and RBtill are reduced by one degree. FIG. 3
shows a circuit diagram embodying the principle diagram of FIG. In FIG. 3, (1) is an encoder,
+414! -One-to-one 11-It is a playback device. The matrix circuit of the reproduction apparatus
(4), the encoder (2) which is the output of the matrix (3) produces an output signal LP'a R1 p'e
LB "s and R '. The above-mentioned output signal, ', R,', LB ', EL' and R 'are applied to the
automatic gain control circuit (l, and the control signal generating circuit (l (7)) connected to the
output terminal Give gain controlled signal to //). The control signal generation circuit c / l)
generates control signals ? and ?, thereby operating the gain control amplifier (/ ?) of the
encoder (?) to change the matrix coefficient of the encoder 1 ?) for encoding Do. . (13) is
provided to monitor each signal at one monitor terminal, which is identical to the playback
device output for playback. Thus, the encoder according to the present invention can control the
degree of separation automatically to always select the matrix coefficient in the best state in
accordance with the importance of the original sound signal. In the above description, the matrix
S ? of the playback apparatus is kept fixed, but the playback apparatus matrix coefficient also
changes according to the control signals a and ?, and the encoder and the playback apparatus
are synchronized. The matrix coefficients can be changed automatically, and if the equation (C1
is used, further improved resolution as shown in [Table 2] can be obtained. [Table 2] When a
logic circuit is caused to act on the encoder and a signal medium such as a record is created,
there is no problem when played back using the playback device IL'4 corresponding to the
encoder. If it is played back on a playback device, there is a fear that inconvenience will occur.
The following conclusions were obtained as a result of several audition tests. [I] At the time of
reproduction by a general reproduction device, movement of localization and other sense of
instability do not occur up to the angle shift Flo degree of the encoder. However, a shift of up to
20 degrees gives a slight localization movement, but does not make an unpleasant sound. [I]
When playing with a playback device compatible with the encoder, the encoder's angle shift does
not show any adverse effect even if it is performed up to 20 degrees, and the localization stability
1 separation is equivalent to that of the discrete Hong channel system . The angle shift amount
and gain shift amount of the encoder and playback device are determined by the magnitude of
4.1 shift ?, but ?9 shift ? and angle shift amount and gain shift amount according to the
present invention The relationship between (ffJ) is shown.
"EndPage: 3 angle shift of playback device: vector of adjacent channel of dominant signal (shift to
the outside). The gain shift of the regenerator; the angular shift of the channel of the dominant
signal == ? If?: shift to the vector whm of the adjacent channel of the dominant signal. -Encoder
gain shift: Decrease the gain of the adjacent channel of the dominant signal. It is desirable that ?
or ? be determined only in the direction of the signal. When the signal level is standard, ? and
? change in the range of ▒ 1. However, when the signal level is increased, the control signal is
stabilized by the action of the automatic gain control circuit, but it is impossible at all to be
constant. Therefore, standard characteristics of the automatic gain control circuit are determined
as shown in FIG. . Therefore, a and ? are ▒ * as shown in t *; You have to forgive and take into
account. As described above, the matrix alternative channel stereo system using the encoder
according to the present invention provides an excellent system in which the degree of
separation of each channel is much better than that of the conventional system and the feeling of
localization is further increased. And the encoder is used to reproduce the signal encoded by the
encoder ?, the reproduction equipment specified in particular! It is possible to hear excellent ?
channel stereo sound without using. .
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vector diagram showing the vibration
direction of the signal to be encoded, FIG. 2 is a principle diagram of an encoder according to the
present invention, FIG. 3 is a detailed circuit diagram thereof, and FIG. --- Vector diagram
showing that the direction of I & large sensitivity vector changes by logic operation, Fig. 5 is a
vector diagram with 360 degrees of the whole, and is expressed by multiplying by a shift angle,
and Fig. 6 is automatic It is a characteristic view of a gain control circuit. Main book description +
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и и и и и и и и и и-Moni-m-p Child patent issued "Applicant Sanyo Electric Co., Ltd. representative-Ige
Tei. Outside-Name. EndPage: 4 1st field first ? $-1-1 (a) (b) 5th field L, entrance play Bar
EndPage: ?
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