JPS50149301

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DESCRIPTION JPS50149301
-1 Bushi name (027) Onkyo Co., Ltd. Representative director of the company, 5th Representative
Takeshi Takeshi ■ Japan Patent Office Open Patent Gazette ■ JP-A 50-1493010 JP-A 50.
(1975) 11.29G 4-6555 light 'list L name of the invention
、スピーカーシステム
The present invention relates to a speaker system suitable for three-dimensional reproduction of
a program source recorded and recorded by a dummy recording / reproducing method. In the
dummy head recording / reproduction method, as shown in FIG. 1, a dummy head 2 having a
head of a listener imitated in front of an original sound field 1 is installed, and the left and right
ear 3L. The original sound is made by the recording microphones 4L and 4R inserted in the 3R,
and the signal of the left channel 1 recorded by the recording microphone 4L is made to reach
only the left ear 7L of the listener and recorded by the recording destination microphone 4R It
reproduces the signal of the right channel three-dimensionally in the rear. When the program
source recorded by this dummy head recording and reproducing method is reproduced by the
normal speaker systems 6L and 6R as shown in FIG. 2, for example, the left channel signal
reproduced from the speaker system 6L of the left channel ( The signal (hereinafter referred to
as “signal”) does not have to reach the listener's left ear 7L, and also reaches the right ear 7R
after the delay time t. The localization of the sound image becomes unclear because of an
unnecessary signal (hereinafter, referred to as an L / ′ ′ signal) reaching the right ear 7R later
after this delay time. In order to investigate the relationship of the localization of sound 1 to the
delay time and amplitude of the L 'signal described above, Damaske conducted the following
experiment. In FIG. 3, the noise signal generated by the noise generator 8 is reproduced as an L
signal from the speaker system 9L of the left channel, and this L signal EndPage: a small delay
time is required after reaching the right ear 7R In order to cancel out the L 'signal, the delay
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signal is also delayed by the delay circuit 10. After passing through the attenuator 11 as an L
'signal, the phase inverter 12 inverts the phase to produce an -L' signal, which is reproduced
from the sph '/ sfum 9L' installed in the right channel to produce this -L 'signal. The perceived
delay time t1 importance was measured. The measurement results are shown in FIG. However,
the positional relationship between the listener and the speaker system 9L, 9I / in the
measurement of the distance between the listener and the speaker system 9L, 9L / and-is 2.6 m,
and the center of the listener front and the speaker system 9L, 9L '. The angle with it is ± 36 °.
Based on this measurement result, Damasque has a constant delay time t regardless of frequency
within the reproduction frequency band. The delay characteristic shown in FIG. 4 is input to the
input terminal 13L- of the left channel by combining the delay circuit having (-290 μsec) and
the delay circuit having a delay time to-t which changes with respect to the frequency. Is
reproduced from the left channel speaker system 9L through a delay circuit 10b having a delay
time to-t, and the above-mentioned signal is delayed for a delay time t.
After passing through the delay circuit 10a having (-290 .mu.BeQ) and the attenuator 11, the
phase is inverted by the phase inverter 12 to make -L 'signal, which is reproduced from the
speaker system 9L' installed in the right channel. The same applies to the right channel
reproduction system. Thus, for example, the L 'signal arriving around the right ear 7R or the L
signal and the one L' signal regenerated from the speaker system 9L 'cancel each other out and
the localization of the sound image becomes clear. Was confirmed. As for the Damascene
experiment and regeneration system described above, The Journal of Acoustical 5 ociety of
Amenica (197, No. 02, 24 October) 'Head-Related Two-Chan nl, 5 tereophony with---constant
regardless of frequency within the wavenumber band The delay circuit 10a having a delay time
to (-j 90 μsec) is generally configured by connecting a lumped constant element, that is, a delay
circuit consisting of an inductance L and a capacity C, in a plurality of stages according to the
delay time. The configuration is extremely complicated, transmission loss is large, noise is
generated, and it is extremely expensive and not suitable for practical use. Also, it was usual for
the phase inverter 12 to be composed of an inverting amplifier using at least one medium
element. The present invention realizes a speaker system capable of obtaining a fixed delay time
to very easily in the caterpillar frequency band, and requires the delay circuit 10a and the phase
inverter 12 which are essential to the Damascene reproduction system described above.
Therefore, the damascene regeneration system can be realized extremely easily and
inexpensively. The speaker system of the present invention, as shown in FIG. 6, overlaps one
speaker system 14 'of the speaker system 14, 14' configured to reproduce the same frequency
band with the other speaker,-the upper surface of the system 14 The two speaker systems 14 °
14 ′ are mounted so as to be slidable relative to each other in the radial direction of the sound
wave. １５はスピーカーである。 When the speaker and system of this structure are applied to
the playback system described above, as shown in FIG. 7, the speaker system of the present
invention is installed equidistantly at equidistant positions on the left and right listeners. The
speaker systems 14L and 14R for the left channel and the spring channel, respectively. With
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regard to the reproduction system of the left channel, after the L signal input to the input
terminal 13L is passed through the delay circuit IQb having a delay time cut-t, the L signal is
reproduced from the speaker system 14 of the speaker system 14L of the left channel and the
signal is attenuated. After that, the speaker system 14 'of the right channel speaker system "blaR"
receives the reverse polarity and reverses the phase, and then the delay time is delayed by a
predetermined delay time. Signal Right Channel Speaker EndPage: The speaker system 14 'of the
right channel speaker system 14R is reproduced from the speaker system 14' of the right
channel system 14R from the speaker system 14 to the distance to correspond to the
predetermined delay time to Slide it so that it is located in the rear.
For example, when corresponding to the reproduction experiment of Damasque described above,
if k is set to about 10 crn, 290 psea as the delay time to can be obtained regardless of the
frequency. Thus, the vertical position relationship between the speaker system 14 and the
speaker system 4 'constituting the left and right channel speaker systems 14L and 14R is such
that the direction detection ability of the listener's (human's) ear is low relative to the vertical
direction The signal L 'signal reproduced from the speaker system 14' of the right channel
speaker system 14R, which is ignored for hearing, is one hour longer than the L signal
reproduced from the speaker system 14 of the left channel speaker system 14L. The delay is
reached to the listener's right ear 7R, and similarly, to the listener's left ear 7L at time t later than
the R signal reproduced from the speaker system 14 of the speaker system 14R of the speaker
system 14R of the left channel speaker system 14L. To reach. Therefore, the L 'signal reaching
the right ear 7R and the -L' signal cancel each other, and the R 'signal reaching the left ear 7L
and the R' signal reaching the left ear 7L The localization of the sound image by the L signal and
the R signal becomes clear by mutually canceling the -R 'signal. Further, according to the speaker
system of the present invention, as a simplified version of the Damascene reproduction system,
even if the delay circuit IQb having the delay time 1o-1 changing with the frequency is omitted,
the delay time 1o-1 or at most As it is 70 μsec, there is no problem in hearing. As is apparent
from the above description, the speaker system of the present invention is movably mounted by
sliding the speaker systems 14 and 14 'configured to reproduce the same frequency band in the
direction of the sound wave emission axis. Because of the structure, desirably, the stacking
direction of the two speaker systems 2 stems 14 and 14 'is the top and bottom of the speaker
system (up and down direction)-by means of a speaker system such as a speaker system. The
signal reproduced from the stem 14 'is propagated to the other 6 speakers,-the delay time
corresponding to the sliding distance from the signal reproduced from the system 14 is also
delayed by 0, and the signal is reversely transmitted to the speaker system 14'. Since the phase
inversion of the reproduction signal can be performed by inputting to the polarity, if the speaker
system of the present invention is applied to the reproduction method of Damasque, this A delay
circuit ioa with a fixed delay time to within the reproduction frequency spreading area which is
essential for the live system, and the delay circuit ioa and the phase inverter 12 are unnecessary,
so that localization of sound image or clear three-dimensional reproduction can be realized
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extremely inexpensively. Play an important role.
4. Brief description of the drawings,-first explanatory drawing of the dummy head recording and
reproducing system, Fig. 2 is an explanation of the case where the program sound source
recorded by the dummy head recording and reproducing system is reproduced by a normal
speaker system Fig. 3 is an explanatory view of a reproduction experiment to investigate the
relationship between the delay time t performed by Damasque and the amplitude of the present
sound image, Fig. 4 is a graph showing the measurement results of the male outcrop, Fig. 5 Fig. 6
is an explanatory view of the playback system of Damasque, Fig. 6 is a view showing the
structure of the speaker system of the present invention, and Fig. 7 is an explanatory view of the
case where the loudspeaker system of the present invention is applied to the playback system of
Damascene . １４、１４’はスピーカーシステム。 EndPage: 3 3 圃 殻 ・ 第 ダ 51 Page
EndPage: 46, Inventors V other than the above (1) inventor inventor address TV shoulder & seat
suspension 貿>,> M 'y, number, number On-Kyoh Co., Ltd. Krahashi: 7 U's 'Name High' j #: I5
Cattle and EndPage: ５
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