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JPS5899095

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPS5899095
[0001]
The present invention relates to a speaker device, and an object of the present invention is to
make a digital input signal from a digital audio device such as a digital audio recoater or a tick
mixer as direct as possible without using an amplifier or the like. By converting to the output
direction k, noise and distortion generated by an amplifier and the like are eliminated, music
reproduction with higher fidelity is performed, and at the same time, the apparatus is simplified
and advantageous in cost. In conventional loudspeaker systems of this type, digital input signals
from digital audio equipment have to be driven by a person in a very complicated process. That
is, in FIG. 1, the digital input signal is converted to the analog-to-analog conversion signal to the
digital-to-analog converter 1, and the deglitch circuit 2 removes the pulse noise called glitch
generated at the time of the digital-to-analog conversion. By blocking unnecessary highfrequency components to prevent the occurrence of aliasing distortion and restoring them to the
original signal, and correcting the high-frequency response deterioration due to the aperture
effect generated at the time of mutual conversion of digital signals and analog signals Then, the
signal is amplified to a level at which the speaker device 6 can be driven by the analog amplifier
4 to obtain an audio output. However, performing such complicated signal processing has a
disadvantage that the apparatus becomes very expensive, and the fidelity is lowered due to noise
and distortion generated by the amplifier and the speaker apparatus itself. The present invention
overcomes the disadvantages of such conventional complex and expensive, distortion- and noiseprone problems, and one embodiment of the present invention will be described with reference
to the drawings. In FIG. 2, a digital position signal B which is an output of a position detector 9
for detecting a mechanical amplitude position of an air vibrator 8 interlocked with an air
vibration element 8 for vibrating air to obtain a sound wave S. Is input to the deviation detection
circuit 6 together with the digital input signal from the digital audio equipment. The deviation
detection circuit 6 detects the deviation between the digital input signal and the position signal B,
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and the magnitude of the deviation is determined by the magnitude of the electric signal. Into the
driving device 7, and the driving device 7 changes the mechanical amplitude position of the air
vibration element 8 to vibrate the air to obtain the sound wave S. Here, an automatic control
system is formed by the path of deviation detection circuit 6 ? driver 7 ? air vibration element
8 ? position detector 9 ? deviation detection circuit 6, and this automatic control system It
works so that the deviation from the digital position signal B becomes zero. ?????????
?
That is, in the conventional speaker device, the speaker element is only driven by the analog
amplifier, and the amplitude amount of the speaker element is not controlled by the automatic
control system, and the distortion generated in the speaker element is great. On the other hand,
according to the speaker device of the present invention, since the amplitude amount of the air
vibration element 8 is automatically controlled, it is possible to obtain a sound wave with less
distortion with high fidelity to the digital signal from the digital audio device. A specific
embodiment of the present invention will be described with reference to FIG. The deviation
detection circuit 6 is a subtraction circuit 10. Positive power supply 11 ░ Negative power supply
12. Polarity changeover switch 13. The subtractor circuit 1o compares the digital input signal
person from the digital audio equipment with the digital position signal B to determine which
signal is larger to determine the polarity output signal C and the signal. The absolute value of the
magnitude difference is output as a deviation output signal as a digital value. The polarity switch
13 is switched by the polarity output signal C, and the switch group 16 is operated by the
deviation output signal. The deviation output signal is composed of a digital signal of several bits.
The most significant bit is called MSB, and the least important be /) is called LSB, and the
importance is 1 in the direction from MSB to LSB. Make it IA every time you bit out. The
resistance group 14 is assumed to have a resistance value of H in the MSB stage, and is
configured to sequentially become a double value as it goes in the direction of LSH. With this
configuration, the larger the difference between the digital output signal and the digital position
signal B, the larger the absolute value of the drive current E. Also, the polarity switching switch
13 is switched depending on which signal is larger. Flow direction will change. In this example,
the drive system shows an example of an electromagnetic drive system, but an electrostatic drive
system, an apparatus which drives by changing air pressure by plasma or the like may be
considered. In this example, a magnetic flux is generated by passing a magnetic flux through the
inside of the yoke 17 by the permanent magnet 16 and flowing the drive current E to the voice
coil 26 wound around the voice coil bobbin 18 connected to the air vibrating element 8 and the
magnetic flux flowing in the yoke 17 The air vibrating element 8 is driven by the action of The
position detector 9 is provided inside the voice coil bobbin 18 in this example, but it may be
installed outside by connecting with a connecting rod or the like as long as it interlocks with the
air vibration element 8. . The position detector 9 will be described with reference to FIGS. 4 (a)
and 4 (b).
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FIG. 4A shows only the inside of the voice coil bobbin 1B of FIG. 3. The supporter 19 is fixed to
the voice coil bobbin 18, and a hole 19a through which light is transmitted is provided in the
vicinity of the center of the supporter 19. The matrix 20 is fixed to the hole 19o. The matrix 20 is
provided with a pattern consisting of a portion blocking the incident light from the light source
21 and a portion transmitting the light, and the light transmitted through the matrix 2 o is
converted by the light receiving element 22 into an electrical signal. When the voice coil bobbin
18 moves and the position of the supporter 19 changes as indicated by a dotted line, the position
of the light spot of the incident light on the IJ wax o changes. Fig. 4 (b) is a front view of that
portion, and shows a 3-bit configuration as a simple example of the matrix 2o. Three light
receiving elements 22a, 22b. Of 22 C, 22 a represents the first bit (MSB), 22 b represents the
second bit, and 22 G represents the third bit (LSB) bit, the incident light of each light 121 a 121
b and 2 I C is the matrix 20 The output of the light receiving elements 22 a, 22 b and 22 c when
reaching the lowermost end of the image becomes ?00o?, and as it moves upward, ?Ool?
?olo? ?011? ?100? ?1o1? ?110? ?111? And change. However, the vibration of the
voice coil bobbin 1-8, that is, the vibration of the air vibration element 8 can be converted into a
digital electric signal. The position detector 9 is variously provided, and as shown in FIG. 5 (a), a
matrix 20 having a portion for reflecting light and a portion for absorbing light is provided on
the surface of the supporter 190, and incident light from the light source 21 is Even if the light
reflected by the matrix 2 ░ is converted into an electric signal by the light receiving element 22
through the condenser lens 23, the light source reflected by the supporter 19 that reflects the
light as shown in FIG. 21 may be passed through a matrix 20 consisting of portions transmitting
and reflected light from the light source 21 and converted into an electric signal by the light
receiving element 22 through the condensing lens 23. Ma) IJ wax can be made to have
irregularities, and various means can be considered such as utilizing the fact that the phase of the
reflected wave from the matrix changes. Now, in these position detectors 9, there is an incident
angle ? of light incident on IJ sox 20. If an extreme example is considered, if the incident angle
? is increased to 96, the position of the voice coil bobbin 1B и Even if it changes, the position of
the light spot on the IJ wax o does not change, and the sensitivity as the position detector 9 is
completely lost.
As apparent from the above-mentioned example, if the angle ? is limited within the range of C3
to SO, the sensitivity as the position detector 9 is reduced if the angle ? is increased, and the
change in the position of the voice coil bobbin 1 иии When the retardation is large, the output
change of the light receiving elements 22a, 22b and 22c does not occur. On the other hand, if the
angle ? is reduced, the sensitivity of the position detector 9 is too small, and the output change
of the light receiving elements 22a, 22b and 22c largely occurs even if the change of the position
of the voice coil bobbin 18 is small. As described above, the sensitivity of the position detector 9
can be changed by changing the angle ?. In the speaker apparatus according to the present
invention, the deviation of the digital input signal person and digital position signal B works so as
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to be zero, so when the sensitivity of the position detector 9 changes, the amplitude of the voice
coil bobbin 18 changes, and as a result, the voice output amount becomes It will change. As
shown in FIG. 3, the light source 21 and the light receiving element 22 are connected at an angle
24 so that the angle 24 can rotate around the center position of the matrix 20. By providing the
adjustment knob 26 so as to control, the amount of audio output as the speaker device can be
adjusted by the adjustment knob 25. The angle 24 and the adjustment knob 25 may be directly
mechanically connected, but may be electrically connected using a motor or the like to be a
remote control. As described above, the speaker device of the present invention reflects and
absorbs light from the light source, the light receiving element, and the light source. The light
receiving element has a matrix having a pattern for changing the state of light incident on the
light receiving element using optical properties such as transmission 5 phase change and
interference, and the light from the light source is received through the matrix A position
detector which supplies the mechanical position of the air vibration element as a digital position
signal supplied to the element, a driving device for driving the air vibration element, a digital
input signal from a digital audio device, and the digital Deviation detection from the position
signal is detected, a drive current which is a deviation signal according to the magnitude of the
deviation is output to supply the drive device with a deviation detection circuit, and the incident
angle of light from the light source to the matrix is variable And an automatic control system
configured to eliminate the deviation from the digital position signal. By the air vibrating element
mechanically positions corresponding to the value of the serial digital input signal driven by the
drive device, in which it is possible to obtain an audio output corresponding to digital input
signals.
And, by providing variable means for changing the incident angle of light from the light source to
the matrix) the sensitivity of the position detector can be changed to adjust the sound output
amount by the air vibration element, it is extremely convenient. It is a thing. In addition, since an
automatic control system is configured for the amplitude of the air vibration element without
having an analog amplifier, it has an excellent advantage such as obtaining an audio output with
small distortion.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing a prior art example, FIG. 2 is a block diagram of one
embodiment of a speaker apparatus according to the present invention, and FIG. 3 is a schematic
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configuration diagram showing the specific embodiment. FIG. 6 shows a specific configuration
example of the position detector, in which (A) is a side sectional view and (B) is a front view.
6 и и и и и и и и и и и deviation detection circuit, и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и Position detector, 1 o и и и и и и и и и и и и и и subtraction circuit , 11 и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и switch Groups 16 16 permanent magnets 17 river
yokes 18 voice coil bobbins 19 supporters 2 o matrix 21 и и и и и и и и и и Light source, 22 и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и adjustment knob. Name of Agent
Attorney Nakao Toshio and 1 other person WA1 Fig. 2 Fig. 4 Fig. 1 If c'cl no C-o) ?
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