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JPS5236001

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DESCRIPTION JPS5236001
■ Stereo device 特 願 Japanese Patent Application No. 45-101283 [Phase] Application No. 45
(1970) November 17 @ inventor Nakamura Tadashi-20 of 20 Tokyo's Adachi-ku, Kono 2 Konoku, Yokohama Japan Hiyoshicho 189 @ Applicants Sony Corporation Tokyo parts for the district
north goods 6 7 35 [phase] agent patent attorney Atsushi Ito
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a stereo reproduction
sound field, FIG. 2 is a system diagram showing an example of a stereo device according to the
present invention, and FIG. 3 is a reproduction sound field for explaining its operation. A plan
view, FIG. 4 is a waveform diagram for explaining the operation, and FIG. 5 is a connection
diagram showing an example of the main part.
Detailed Description of the Invention In a normal 2-channel stereo, as shown in FIG. 1A, the
speakers 1 and 2 are disposed on the left front and the right front of the listener 5, respectively,
to which left and right signals, ie channel stereos. Signal. Stereo playback occurs by supplying R.
□ As opposed to this, as shown in FIG. 1B, the speakers 3 and 4 are disposed further to the left
rear and the right rear of the listener 5, and these four channels 1 to 4 correspond to the
positions of these speakers 1 to 4 respectively. A four channel stereo reproduction method is
proposed which is supplied for stereo reproduction. The present invention is intended to provide
a stereo device capable of artificially converting the 2-channel stereo signal described above into
a 4-channel stereo signal as shown in FIG. 1B. An example of the present invention will be
described with reference to the following. 1 In FIG. 2, 6 indicates a 2-channel stereo signal source
such as a tape recorder, a record [111111] player, a tuner, etc., a 2-channel stereo signal from
here, R through a stereo preamplifier 7P and further through a stereo main amplifier 7M. The
speaker 2 arranged as shown in FIG. 1B is supplied. In the present invention, signals La- (L-ctR),
Ra- (R-dL), and (0.ltoreq..alpha..ltoreq.1) are obtained from the stereo signal R and this signal La.
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The levels of Ra are respectively controlled by their integrated signals, and the level-controlled
signals are reproduced from the speaker 3.degree. That is, in the example shown in FIG. 2, a
stereo signal from the preamplifier 7P, R is supplied to the matrix circuit 8 to be signals La- (LdR) and Ra- (R-dL), and these signals La. Ra is supplied to the level control circuit 9 and the
rectifier circuit 10, the signals La and Ra are rectified in the rectifier circuit 10, and the rectified
signals Lb and Rb are supplied to the integrating circuit 11 for integration, respectively, and the
integrated signal Lc, Re is supplied to the control circuit 9 as a control signal, whereby the
signals La and Ra are level-controlled by the signal Lc2Re, and the control output signals Ld and
Rd are arranged through the stereo main amplifier 12 as shown in FIG. 1B. It is supplied to the
speaker 3 ° 4. The operation of the device described above will now be described. In order to
facilitate understanding, the gain of the control circuit 9 is constant regardless of the levels of the
signals Lc and Re, and therefore Ld-La = (L-ctR) and Rd = Ra = (R-dL).
First, assuming that the signal from the signal source 6 is a signal component such that R is L = R
= A, as shown in FIG. 3A, the signal A is a speaker, and the sound output A1-A2 (a level is a Since
Ld = (L−dR) and Rd = (R−ctL), for example, if d =, then Ld = Rd = [111111] EndPage: 1A3. A4 is
obtained. Then, since these sound outputs A1 to A4 are listened, that is, these sound outputs A1
to A4 are symmetrical with respect to the listener 5, but the sound output A1. A2 is a rear
acoustic output A3. Since the level is larger than A4, the sound image A by the signal A. Is
localized to the front of the listener 5. This sound image A. When the signal A is supplied to a 2channel stereo reproduction apparatus, the sound image M is localized at the center of the
speakers 1 and 2 as shown in FIG. Sound output A3 from the localization position. The position
closer to the listener 5 corresponds to the level -a of A4, but this is almost the same as the
localization position of the sound image section '. Next, assuming that the signal from the signal
source 6 is a signal component such that R is L = B, R = 0, as shown in FIG. 3B, an acoustic output
B1 (level b) can be obtained from the speaker 1 as well. Since no sound output can be obtained
from the speaker 2 while the signal Ld = B1Rf−−3 = B is supplied to the speakers 3 and 4, a
sound output B3 with a level b is obtained from the speaker 3, From the speaker 34, an acoustic
output B4 of level or 1b is obtained. Then, since these sound outputs BljB3jB4 are listened to,
that is, the sound output B1. The sound image B by the signal B because the level of B3 is higher
than the level of the sound output B4 on the right side and the level of the sound output B at the
rear and B4 is larger than the level of the sound output B1 in front. Is localized to the left rear of
the listener 5. Therefore, when the signal B is reproduced by a two-channel stereo reproduction
apparatus, the sound image B is as shown in FIG. 3C. According to the device of the present
invention, the sound image B of the signal B, compared to the 'localized to the position of the
loudspeaker 1 Has moved to the position shown in FIG. 3B. Also, in the case of the signal L = O1R
= C contrary to the above, the sound C8 of the signal C is localized to the right rear of the listener
1, as shown in FIG. 3B, for the same reason. It has moved from the localization position of the
sound image C8 'by the two-channel stereo reproduction device d shown in FIG. Therefore,
according to the apparatus of the present invention, it is possible to listen to a 2-channel stereo
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signal with a sense of reality like a 4-channel stereo signal.
And the signal Ld supplied to the speakers 3 and 4. If the average level of Rd is changed, the
average level of the sound output from the speakers 3 and 4 is changed, so the localization
position of the sound image is changed back and forth, and the value of the mixing ratio α of the
matrix circuit 8 is changed. For example, since Ld = (L-αR) and Rd = (R-αL), the levels of the
right signal R supplied to the left rear speaker 3 and the left signal supplied to the right rear
speaker 4 are respectively Because of the change, the localization position of the sound image is
changed in the left and right direction. Furthermore, in this case, in the present invention, the
levels of the signals Ld and Rd supplied to the speakers 3 and 4 are controlled by the signals Lc
and Rc, so that the reproduction of the above-described pseudo 4 channel stereo feels more
natural. Can. That is, since the signal La is supplied to the rectifier circuit 10 and rectified, if the
level of the signal La changes, for example, as shown in FIG. 4A, the level change of the signal La
from the rectifier circuit 10 Since a signal Lb as shown in FIG. 4B is obtained and supplied to the
integrating circuit 11, a signal as shown in FIG. 4C is obtained as an output signal Lc from this. In
this case, when the signal Lb is a rectangular wave, the integration circuit 100 time constant is
selected so that the rising period Tr of the signal Lc is 50 to 2077 L seconds. The gain for the
signal La of the level control circuit 9 is changed as shown in the fourth scheme by the signal Lc
thus obtained, and the level of the signal Ld is raised by, for example, 6 dB. The same applies to
the signals Ra-Rd. Therefore, when the tone of the instrument at time t1 in FIG. 4 ends, the signal
from the signal source 6 is reduced, and when the amplitude of H decreases (the signal in actual
use, the amplitude of R is almost zero. Since the signals Ld and Rd are kept high for most of the
time), the acoustic outputs from the speakers 1 and 2 simultaneously decrease at time t1.
However, the gain of the level control circuit 9 is lowered from the high state by the signals Lc
and Rc in the falling period Tf of the signals Lc and Re from time t □, so the signals Ld and Rd
from the level control circuit 9 are reduced. As shown in FIG. 4E, in period Tf, the level gradually
decreases from the level before time t1 to the original level. Accordingly, the sound output of the
speakers 3 and 4 gradually decreases from time t1. That is, the sound output from the speakers 3
and 4 can give the listener 5 an effect similar to the reverberation on the sound output of the
speaker 11111111 EndPage: 21.2, so that a natural feeling is reproduced.
As described above, according to the present invention, a two-channel stereo signal can be
reproduced as a four-channel stereo, and furthermore, the reproduced sound can be a
reproduced sound with a natural feeling. FIG. 5 shows an example of a specific connection
diagram for obtaining signals Ld and Rd from R and R. R is supplied to the transistor 8Lt8R of
the matrix circuit 8 through the input terminals 13L and 13R, and the signal ± from the
collector and emitter of the transistor 8Lt8R is taken out and ± R is taken out and the signal is
matrixed by the resistors 18L, 28L, 18R and 28R The signals La and Ra are supplied to the level
control circuit 12 as La- (L-.alpha.R) and Ra- (R- (ZL). The level control circuit 12L for the signal
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La is a transistor 22L. A negative feedback amplifier consisting of 23L is formed, and a transistor
19L is connected to the negative feedback loop as a variable impedance element. Then, a signal
Ld which is an output signal of the control circuit 12L is taken out from the output terminal 14L
and a part of the signal Ld is supplied to the high pass filter 16L through the transistor 15L. By
the way, when the level of the signal La is raised in the control circuit 12L, the level of the noise
signal contained in the signal La also rises, and generally, the signal contained in R and hence the
noise signal contained in the signal La is Since a large amount is distributed in the high region,
when the signal R is composed of only the low region component, when the level of the signal La
becomes high, the auditory feeling may be impaired due to the noise signal of the high region. In
order to solve this, in the example of the figure, when the filter 16L is constituted by the
transistor 17L and the signal La consists only of low-pass components, the signal Lc can not be
obtained, so that the level of the signal La does not become high. It is done. The cutoff frequency
of the filter 16L is, for example, 170 Hz. The output signal Ld of the filter 16L is rectified by the
diodes 20L and 21L of the rectifier circuit 10 to be a signal Lb, and the signal Lb is integrated by
the integration circuit 11L to be a signal Lc, which is supplied to the transistor 19L. The
impedance is variably controlled, and thus the gain of the control circuit 12L is variably
controlled, whereby the signal Ld from the terminal 14L is a controlled signal as described above.
The signal R is similarly processed to be a signal Rd, and the corresponding parts are denoted by
the same numerals with the subscript R in place of the subscripts, and the description will be
omitted.
Thus, according to the present invention, a 2-channel stereo signal can be reproduced with the
sense of realism of 4-channel stereo, and its configuration is characterized by only a simple
circuit and requiring no special means. In the above example, the rise and fall time constants of
the integration circuit 11 are the same, but may be different using diodes or the like. As shown in
FIGS. 1C and 1D, the speakers 1 and 2 are disposed on the left front and the right front of the
listener 5, and the speakers 3 and 4 are disposed at symmetrical positions with respect to the
listener 5 Since reproduction can also be performed, even if signals are provided to the speakers
1 to 4 arranged as shown in FIGS. 1C and 1D and R, Ld, and Rd are supplied, the presence of a 4channel stereo corresponding to the speaker arrangement You can get a feeling. According to the
experiment α) 3! -When it was closed, it was possible to get the most realistic sense of four.
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