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JPS5585190

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DESCRIPTION JPS5585190
Description 1, title of the invention
Automotive sound reproduction device
3. Detailed Description of the Invention The present invention relates to an on-vehicle acoustic
reproduction device used in a vehicle cabin of a car, and provides an on-vehicle acoustic
reproduction device capable of obtaining nine senses even when listening in a small space. FIG. 1
shows an outline of a conventional in-vehicle sound reproducing apparatus. In FIG. 1, 1 is a
passenger compartment of a car, 2.2 'is a front seat installed in the passenger compartment 1, 3
is a rear seat, 4 is a noseble, 5 is a driver. Reference numerals 6 and 7 denote speakers disposed
on the left and right of the rear of the rear seat 3, respectively, and the driver 6 listens to the
sound from the left and right speakers 6.7. In FIG. 1, Hl L, Hl R is the transmission between the
speaker 7 and the left ear L 1 right ear R of the driver 6-number, H 2 L # H 2 R is between the
speaker 6 and the left ear L 1 right ear R of the driver 5 The sound pressure applied to the left
ear of the right ear R1 of the driver 5 when the signal A5 is applied to the speaker 6.7 is as
follows. The equation (1) is described as a matrix as follows: EndPage: 1 However, in the abovementioned conventional apparatus, the driver 5 has a drawback that the sound field can not be
expanded. The present invention eliminates the above-mentioned conventional drawbacks and
obtains the same effect as moving the speaker 6.7 outward. In FIG. 2, assuming that the speaker
8 is disposed at the heel position, the sound pressures PR 'and PL' generated on the both ears of
the driver 6 by the speaker 8 are as follows. On the other hand, when the signal AB is applied to
the speaker 6.7 through the encoding matrix [El by an electric circuit, the sound pressures Pi and
PL ′ ′ generated in both ears are as follows. The encoding matrix (E1 is determined as follows
when the equation (3) and the equation (4) are completely equal is obtained. The equation (6) is
configured as shown in FIG. -A feedback circuit with a loop. That is, when the signal A3 is applied
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to the speaker 6.7 via the block shown in FIG. 3 and listened to, the sound is felt to be emitted
from the position of the eyebrow, and the sound field is expanded. The delay circuit 9 is for
correcting the difference in distance between the speaker 6.7 and the driver 6 in FIG. According
to the experiment of the inventor, it has been found that the block in FIG. 3 can also obtain the
sound field expanding effect. As shown in FIG. 4, FIG. 5, FIG. 6 and FIG. 7 respectively show the
case between the speaker and the left ear of the listener when the speaker is disposed at the
position of angle 180, 160. 90. The transfer characteristics are determined by experiments. In
FIG. 2, the position of the speaker 6 is θ = 15Q0, and the position of the speaker 7 is θ = 180.
The position of the eyebrow is θ = 90 (clockwise), and the block in FIG. 3 is as shown in FIG. 8,
FIG. 9, and FIG.
FIG. 8 shows phase characteristics. FIG. 11 shows a delay circuit for correcting the difference in
distance from the listener according to an embodiment of the present invention using the above
principle, 14.15 an adder, and 16 and 17 amplifiers. In FIG. 11, the R channel signal is applied to
the adder 14 through the equalizer 10, and a part is applied to the L channel adder 16 through
the equalizer 12. On the other hand, the L channel signal is applied to the adder 16 via the
equalizer 11 and a part is applied to the adder 14 via the equalizer 13. The two signals added by
the adder 14 are applied to the speaker 6 through the delay circuit 9 and the amplifier 16. On
the other hand, the two signals added by the adder 16 are applied to the speaker 7 through the
amplifier 17. As a result, the driver 6 feels that the speaker 7 EndPage: 2 is at the heel position,
and the speaker 6 senses the expansion of the sound field at the heel position. Still in the present
embodiment, the R channel and L channel signals are added by the adder 18 and this added
signal is added to the reverberation addition circuit 19 consisting of BED etc. to add
reverberation, and this reverberation signal is added to the phase shifter 20. , And generates two
reverberation signals of opposite phase, and this reverberation signal is added to the adder 14 °
16. Thus, when the reverberation signal is added to each channel in reverse phase, a sense of
distance is generated, and the speaker feels as if the driver is away from the driver. As described
above, according to the present embodiment, the spread of sound can be felt even in a narrow
vehicle compartment. 12 and 13 show another embodiment of the present invention. The present
embodiment is an example in which a speaker 21.22 is disposed in front of the driver 6 as shown
in FIG. 12. The circuit configuration of the present embodiment will be described below with
reference to FIG. In FIG. 13, 21.22 and 23.24 are subtractors, and R channel and L channel
signals are subtracted by these subtractors. The subtraction signal includes reverberation
components of the R and L channel signals. 1o 、11 、12 。 13 'is an equalizer similar
to the equalizers 10, 11.12 and 13, respectively. The reverberation components output from the
subtractors 21 to 24 are applied to the speakers 6.7, 21 and 22 through the equalizer, and the
reverberation components are expanded. On the other hand, reverberation signals of opposite
phase obtained by the adder 18 and obtained through the reverberation adding device 19 and
the phase shifter 20 are added by the adder 23.24.25.degree. 26 so that a sense of distance can
be obtained. It is.
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FIG. 14 shows a simplified version of the embodiment shown in FIG. The present invention is an
external acid as described above, and according to the present invention has the advantage of
being able to expand the sound field even in a narrow cabin.
4. Brief description of the drawings FIG. 1 is a schematic view of a conventional on-vehicle
acoustic reproducing apparatus, FIG. 2 is a schematic view showing the basic principle of the
present invention, and FIG. 3 is a block diagram showing the basic principle of the present
invention Fig. 4 is a schematic diagram of a measurement system for measuring the transfer
characteristics in each direction, Fig. 4 is a transfer characteristic diagram and a phase
characteristic diagram, Fig. 11 is a block diagram of an on-vehicle acoustic reproduction device
in one embodiment of the present invention, Fig. 12 FIG. 13 is a schematic view of another
embodiment of the present invention, and FIG. 13 and FIG. 14 are block diagrams of the other
embodiment of the present invention. 1 ··· · · · Car room, 5 · · · · · · · · · · · · Driver (listener), 6t 7 · · · ·
· · · · · · · · · · · · · · · · · · · · · · · delay circuit, 10, 1σ, H, 11 '. 12.12 ', 13.13' river ... equalizer, 14.14 ',
15 degrees 16' ..... adder, 18, 16 ', 17, 17' ........ amplifier, 18 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · Phase theater, 21.22 · · · · · · · · · · · 23 ° 24.25, 26 · · · group -Adder. Name of agent Attorney
Nakao et al. 1 person Fig. 1 EndPage: 3
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