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1. Title of the Invention 2 Inventor 4 List of Attachments (1) 1 Specification (2) Drawing 1 (3)
Requests for Subsidiary Application 1 ■ Japanese Patent Office ■ Japanese Patent Publication
50-374240 Published Japanese Patent 50. (1975) 4 ° 8 ■ Japanese Patent Application No. LB8 '/ 3j L5 [phase] Application date (197B) 8.2 Request for examination of examination (3 pages
in total) Office internal reference number bibs 55 description 1, title 1 of the invention,
synthesizer for multiple sound sources in the namespace of the invention
Multi-sound source synthesis device in the spacecraft Kuoraniokerutengengosou Sorachi space
3. Detailed Description of the Invention The present invention relates to an apparatus for
accurately synthesizing in air the sound waves emitted from a plurality of sound sources. In
particular, it relates to an ultra-small speaker device which has a plurality of ultra-small
loudspeakers facing each other and has a good response in a frequency range of 20 to 300 Hz. In
the model, there was a problem that the sound pressure of the bass was extremely low during
operation. The synthesizer according to the invention solves this problem mainly, by making the
two diaphragms face each other to efficiently increase the sound pressure in a very narrow
space, and to make the two sound sources approach one another. The conventional problem is
solved by completely polymerizing and synthesizing the sound waves from the two sound
sources. For this reason, it is possible to intensify the bass with a small speaker, and it becomes
possible to reproduce the bass with an inexpensive small speaker without using an expensive
large speaker. The embodiment of the present invention will be described. As shown in FIG. 1, the
dynamic type, crystal type etc.,-force -1 and 2 are separated by the maximum distance and fixed
to the rear wall 5 so that the front face 'of the diaphragm is opposite. Let The dimensions, model,
and characteristics of both speakers are as close as possible, and EndPage: 1 must be met. Of
course, it is also possible to mount two speakers in the same seven frame and to make this into a
single combined speaker. Each speaker is provided with a sound-absorbing optimum housing 10
having a vent, and the sound is emitted from the drive unit 7 including the diaphragm, and is
emitted through the vent 6 having the same area as that of the diaphragm Ru. Vibrate this vent.
When making it smaller than a plate, it is called a diffraction hole. Further, side walls 3 are fixed
to both ends of the speaker. Thus, a small composite eye having openings 4 is created,
surrounded by the front, side and rear walls of the loudspeaker. A sound absorbing material 20
having appropriate sound absorption is applied to the wall surface exposed to the synthetic
space. When a voltage from the output circuit is applied to the speakers 1 and 2 and connected
to the output circuit so as to equalize the phase, the amplitude, and the waveform, two special
phenomena occur. First, when both speakers maintain a maximum distance sufficiently small
compared to the dimensions of the diaphragm, the wavelength of the sound wave, etc., the
diaphragms of both speakers are simultaneously two speakers because the phases are equal. The
sound pressure which is larger by about 5 to 20 decibels than in the case where the same is
attached to the same wall surface is obtained and propagates from the opening 4.
Second, because the diaphragms of both speakers are close to each other, the sound waves
emitted from the two sound sources are completely synthesized in the air and the sound pressure
becomes large, and this tendency is more pronounced as the wavelength is larger Great As shown
in FIG. 3, if the side wall near the opening is provided with a side wall 9 so that the sound wave is
released also from the side opening 8, the directivity can be changed. Also, as shown in FIG. 5,
the diaphragms of both speakers can be made to face each other at a specific angle (8 to 60
degrees) and be surrounded by the side wall 13 and the front wall 14 to emit sound waves from
the opening 11 . In this case, it is necessary to determine the reflectance @ sound absorption
coefficient of the inner wall so that the phase inversion is prevented by minimizing the reflected
sound at the time of sound wave synthesis, and the synthesized sound is amplified by reflection.
As described above, although this device blinks using two speakers, the characteristics of both
speakers are not always the same, so to correct this, use a correction circuit as shown in FIG. You
can also. The low frequency signal input to the input terminal 15 is amplified by the amplifier
circuit 16 and further connected to the speaker 1 through the amplifier circuit 18 at the
subsequent stage, and for the speaker 2, phase adjustment with the fixed resistor r1 capacitor 01
variable resistor R It is also possible to select the desired synthetic sound wave frequency range
by connecting the circuit 17, the tone volume control circuit 19 and the amplification circuit 12
and adjusting the phase, amplitude, etc. precisely. As described above in detail, the present
invention is intended to perform high-power and bass reproduction with inexpensive and smallsized speakers, and to improve the sound quality of in-vehicle stereos, bed-only stereos, small
radios, desktop stereos and other small-sized audio equipment. It is intended to provide an
effective means 04, a brief explanation of the drawings. FIG. 1 is a sectional view showing an
example of the synthesizing apparatus of the present invention, FIG. 2 is a front view thereof, and
FIG. 3 is another embodiment. 4 is a front view, FIG. 5 is a sectional view showing still another
embodiment, and FIG. 6 is a block diagram of a correction circuit for adjusting the phase etc.
Drive 7, housing 10, maximum ff1lliLdr is shown. EndPage: 2
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description, jps5037424
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