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DESCRIPTION JP3180273

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DESCRIPTION JP3180273
Abstract: The present invention provides a high stroke reduced residual vibration speaker box
that enables a speaker box that realizes a high stroke of a diaphragm when residual vibration
sound is not generated while suppressing excessive vibration sound. SOLUTION: A noise sound
picked up from a condenser microphone 6 is inverted by an inverse phase inverting circuit 8
from an input terminal 1 through an AF amplifier 2 and input to a cancellation waveform
synthesizing circuit 9 simultaneously with the AF amplifier 2 Do. Furthermore, the switching
mode processor unit 10 determines whether there is noise or not, and the aluminum thin film
plate 13 closely attached to the diaphragm 5 from the braking coil 4 to the diaphragm 5 by the
DC voltage or the output of the cancellation waveform synthesis circuit 9 to be braked It is a
high-stroke reduction residual vibration speaker box that exerts a force to suppress residual
vibration noise and enhances stroke efficiency. [Selected figure] Figure 1
High stroke reduction residual vibration speaker box
[0001]
The present invention relates to an acoustic box device that can make the best use of a high
efficiency speaker free of extra resonant sound in an acoustic speaker box.
[0002]
In the case of inputting an acoustic electrical signal, there is a problem in that there is a problem
in which a roar comes out from the difference between the vibration generated by the diaphragm
of the speaker and the frequency of the resonance box in the acoustic speaker box. There was a
problem that obstructed.
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[0003]
Even if the vibration of the speaker vibrates efficiently, there is a problem that the capacity of the
sound box is limited and it is difficult to reproduce a low frequency band, for example, a deep
bass of about 20 Hz, and only a simulated sound far from the original sound.
[0004]
Recently, the need to miniaturize acoustic stereos has been emphasized, so the miniaturization of
acoustic boxes is required.
Moreover, it is also required to improve the acoustic performance, and technical development is
required.
[0005]
Therefore, when an acoustic electrical signal is input to the speaker, the sound is picked up with
a high-performance microphone externally, and an error signal is detected in comparison with
the input signal, and the speaker vibration is damped to suppress unnecessary vibration or An
object of the present invention is to provide a high-stroke reduced vibration speaker box capable
of reproduction with an increased stroke rate by an electromagnet or the like in front of a
diaphragm in order to increase speaker efficiency when error vibration is small.
[0006]
The high stroke reduction residual vibration speaker box according to claim 1 of the present
invention is a noise and sound signal picked up from the condenser microphone provided in the
cabinet of one speaker box via the AF amplifier from the input terminal to the moving coil from
the input terminal. From the mixed electric signal, and the phase of the output of the condenser
microphone from the electric signal to which the acoustic signal is input and the capacitor
microphone are inverted, and this signal and the acoustic signal from the AF amplifier are
simultaneously canceled and input to the waveform synthesis circuit Only the noise signal mixed
is input to the braking coil and noise is applied to the aluminum thin plate provided on the
diaphragm in a reverse direction so that no extra vibration noise is produced.
[0007]
In the high-stroke reduced residual vibration speaker box according to claim 2 of the present
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invention, in claim 1, when noise noise does not appear outside, the switching mode processor
causes the DC voltage from the DC terminal to the braking coil through the electronic relay. In
addition, it is characterized in that the stroke rate of the speaker is increased.
[0008]
When the sound comes out from the speaker box, if the extra vibration noise comes out, the
braking coil is made not to output the sound and the DC voltage is applied to the braking coil
otherwise, the speaker The stroke efficiency of can be enhanced to enhance the expansion of the
low range.
[0009]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1
to 3.
FIG. 1 is a diagram of the configuration of the electrical circuit in the acoustic box.
1 inputs an audio signal at an input terminal.
It is connected to 2 AF amplifier, amplified, and the output is connected to 3 moving coil.
[0010]
The moving coil 3 is in close contact with the diaphragm 12.
The sound is converted to sound and emitted to the outside by this is picked up by the 6
condenser microphone provided on the sound collecting surface, connected to the 7 microphone
amplifier and amplified and connected to the 8 antiphase inverting circuit and picked up from
the 6 condenser microphone Inverts the waveform of the muffled sound.
On the other hand, the output signal from the 2AF amplifier is added to the 9 cancellation
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waveform synthesis circuit together with the output from the 8 antiphase inverter.
The signal from the 9 cancellation waveform synthesis circuit is judged in the 10-switch mode
processor unit whether or not there is any distortion signal corresponding to the error signal.
[0011]
On the other hand, when it is determined that the distortion signal is present in the 10 switching
mode processor unit by connecting from the 2 AF amplifier to the 16 first electronic relay units,
the 16 first electronic relay unit is opened, and the 9 cancellation waveforms The signal from the
synthesis circuit passes through and is output to the four braking coils.
[0012]
The four braking coils brake the braking force in the direction opposite to the moving direction
of the three moving coils with respect to the 13 aluminum thin film plate so as not to make an
extra vibration noise.
[0013]
FIG. 3 is a view showing the operation of 3 moving coils, 4 braking coils and 15 drive magnets in
FIG.
As shown in the figure, assuming that the 3 moving coils move in the left and right direction with
the 15 magnetic poles repelled by the 15 drive magnets, the 4 braking coils work in the opposite
direction to the 3 moving coils and act as a braking force and work in the opposite direction. Do.
This is the case of P input. This is a case where an error signal is input when the first electronic
relay unit is opened.
[0014]
Next, in FIG. 1, when the 9 switching mode processor unit does not detect an error signal, a
direct current is applied to the direct current terminal and the 4 direct current switches the
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braking coil to an electromagnet via the second electronic relay unit 17 and the moving coil unit
Increase the swing of This increases the stroke efficiency of the 12 diaphragm.
[0015]
As a result, at the Q input, the braking coil unit exerts the same direction force as the moving
coil, and the diaphragm moves with high efficiency, so that it is possible to reproduce deep bass
sound.
[0016]
In FIG. 3, the external sound is a mixture of noise sound and audio output, picked up by a
microphone, processed by an electronic circuit block unit, and provided with sound pressure
from a 3 moving coil and 12 diaphragms and 4 braking coils provided in a speaker. The braking
force prevents the extraneous vibration from coming out as sound into the room space where the
speaker box is placed.
[0017]
It is a figure of the whole structure of the speaker box of this invention.
It is a figure which shows an effect | action of a damping | braking coil part and a moving coil.
It is a figure of the noise control circuit which goes to the exterior.
[0018]
Reference Signs List 1 input terminal 2 AF amplifier 3 moving coil 4 braking coil 5 drive magnet
6 capacitor microphone 7 microphone amplifier 8 reverse phase inversion circuit 9 cancellation
waveform synthesis circuit 10 switching mode processor 11 electronic circuit block portion 12
diaphragm 13 aluminum thin film plate 14 speaker Box part 15 Drive magnet 16 First electronic
relay 17 Second electronic relay
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