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JPS5553999

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DESCRIPTION JPS5553999
Description 1, title of the invention
Sound reproduction device
3. Detailed Description of the Invention The present invention relates to a sound reproduction
apparatus for listening in a relatively narrow room such as a car room. FIG. 1 shows a listening
condition in a relatively narrow room 2,... Such as the interior of a car. In FIG. 1, 1 is a left
speaker, 2 is a right speaker, and 3 is a listener. In a car cabin or the like, no feeling of expansion
of a sound field beyond the car cabin is felt. This is because, for example, in FIG. 1, the sound
from the left speaker 1 reaches the left and right ears of the listener 3 and the sound pressures
Sa and Sb are added respectively, so the listener 3 feels the direction of the left speaker 1 It is to
According to the present invention, the left speaker 1 and the right speaker 2 are disposed
outside of the position where they are actually disposed, but they produce a listening condition
like this, and a sufficiently wide sense of wideness even in a relatively narrow room such as a car.
It is an object of the present invention to provide a sound reproduction device which can be
obtained and whose sound field correction can be easily performed. First, when looking at the
sense of expansion, in order to move the left speaker 1 further to the left, the sound from the left
speaker 1 may be made to enter only the left ear of the listener 3, and the left signal Is applied to
the right speaker 2 in reverse phase, and the sound pressure Sd from the right speaker 2 may be
canceled by the sound pressure Sd. EndPage: Now, the distance between the left speaker 1 and
the right speaker 2 is the diameter of the head of the W1 listener 3 23 the distance between the
left speaker 1 and the left and right ears of the listener 3 is a, b, respectively. Assuming that the
distance between the right speaker 2 and the right ear of the listener 3 is d1 and the distance
between the line connecting the left and right speakers 1 and 2 to the listener 3 is k, and the
sound pressure Sd cancels the sound pressure Sb Pressures Sb and bd are respectively in inverse
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proportion to the distance i1 [[ib, d, so the sound pressure ratio at the right ear is: signals L and
?n L for left and right speakers 1 ░ 2 so that k approaches 1 Should be applied. Although the
speaker can be moved outward by the cancellation effect as described above, the movement of
the speaker alone does not provide a feeling of wide enough, and the distance feeling to the
speaker felt by the listener 3 is lengthened. There is a need. ~ A sense of distance to a sound
source generally felt by human beings is determined by the acoustic energy density ratio AR of
indirect sound to direct sound at the listening point (0) acoustic energy @ degree ratio AR is the
acoustic energy of direct sound Expressed by density, the sense of distance is small when AH
approaches ?, and the sense of distance increases as AR gets more dogs. That is, the sense of
distance can be lengthened by increasing the acoustic energy density of the indirect sound
delayed as compared to the direct sound.
FIG. 2 shows an embodiment of the invention, in which 10 and 11 are input terminals to which
left and right stereo signals are applied, 12.13 is an adder, 14 is a phase shifter, 15.16 is an
amplifier, 17 is an amplifier. A delay circuit, 18.19 are left and right speakers, 2o is an adder, 21
is a delay circuit for delaying in a range of 5 to 3 ms, and 22 is a phase shifter. In FIG. 2, the left
and right stereo signals applied to the input terminal 10.11 are respectively applied to the adder
12.degree. 13, but the signal applied to the input terminal 11 is in reverse phase in the phase
shifter 14 and the adder 12 to achieve the cancellation effect. Further, an indirect sound signal is
applied to each of the adders 12.13. That is, the left and right stereo signals are added by the
adder 20 and delayed by 6 to 30 m5 by the delay circuit 21 to become an indirect sound signal,
and this indirect sound signal is applied to the adder 12 and is in reverse phase by the phase
shifter 22 It is applied to the adder 13. When the indirect sound signal is added to the left and
right channels in the reverse phase relation as described above, the effect of sound image
enlargement is increased to 0, ie, to the direct sound signal, the indirect sound signal B is
expressed as follows. , H I I, sin ?t B = 12 sin ? (t-T) The synthesized signals at each speaker are
A B B and A-B respectively, and A-+ 43 = 11sina + t + 12sin ? (t-'r) AB-Isin ?t-12sin ? (t -T)
There is a phase difference between them, and this phase difference will psychologically localize
the sound image to the phase advanced between the two speakers, and this auditory
psychological influence will be different for each band Therefore, the sound image is enlarged.
The signals added by the adder 12.13 are respectively applied to the speaker 8.19 through the
amplifier 15.16, but the signal of the right channel is delayed by the delay circuit 17 and
received by the left and right speakers 8.19. The time difference caused by the difference in
distance between listeners is corrected. The delay circuit 17 is not necessary when the distance
between the listener and the left and right speakers 8.19 is substantially equal. In the above
embodiment, the spread of only one of the left and right speakers is mainly used, but as shown in
FIG. 3, the four circuits 61 to 53 or the equalizer 64 for crosstalk Kinse Y, 55EndPage: 27t. When
considering 51 to 53.56.57, the driver's seat can be direct at a, b at the driver's seat, central
listening at C, and passenger's seat and sound field correction control at d. 58.59 is a phase
shifter. As described above, according to the sound reproducing apparatus of the present
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invention, since one stereo signal is applied to the other stereo signal in reverse phase, it is
possible to cancel each other at the listener's ear, and the speaker While being able to widen the
interval, 6 to 30m1!
Since the delayed indirect sound signal is added to both channels, the same 8R as in a wide room
can be obtained, and the sense of distance between the left and right speakers 1 can be
lengthened, and sufficient spread even in a relatively narrow room It makes it possible to hear
with a sense, and it is possible to easily correct the sound field according to the eight groups.
4. Brief Description of the Drawings FIG. 1 is a schematic view showing a general state of
listening to a speaker, and FIGS. 2 and 3 are block diagrams of a sound reproducing apparatus
according to an embodiment of the present invention. 1011 ? и 1e и Input terminal, 12.13 и и и и и и
Adder, 14, 58, 59 и и и и и Phase shifter, 15 ░ 16 и и и и и и и и и и и и и и и ... delay circuit, 18 ░ 19 ......
speaker, 20 ... YamaKa J'Jk, 21 ииииииии delay circuit, 22 ииииии phase shifter, 51 , 52 ░ 53.56.57 ? ?
? ? ? ? ? ? ? ? ?. Name of agent Attorney Nakao Toshio Nakano has 1 person Figure 1
Figure 2 Figure 122 EndPage: ?
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