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JPS5899096

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DESCRIPTION JPS5899096
[0001]
The present invention relates to a speaker device, and its object is to convert digital input signals
from digital audio equipment such as digital audio recorders and digital mixers into audio output
by the speaker device as directly as possible without passing through an amplifier or the like.
Thus, noise and distortion generated by an amplifier or the like can be reproduced to reproduce
music with higher fidelity, and at the same time, the apparatus can be simplified to be
advantageous in cost. In the conventional speaker apparatus of this type, driving with a digital
input signal from a digital audio device has to go through a very complicated process. That is, the
digital input signal is converted to an analog signal by the digital-analog converter 1 in FIG. 1, the
glitch noise generated during the digital-analog conversion is removed by the deglitch circuit 2,
and the high pass filter 3 To prevent the generation of aliasing distortion by blocking the
frequency component and restore it to the original signal, correct the reduction of the high
frequency response due to the aperture effect that occurs at the time of the mutual conversion of
the digital small signal and the analog signal Then, it 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 noise-prone problems, and one embodiment
of the present invention will be described with reference to the drawings. In FIG. 2, the digital
position signal B which is the output of the position detector 19 for detecting the mechanical
amplitude position of the air vibrating element interlocked with the air vibrating element 8 for
vibrating the air to obtain the sound wave S is The deviation is detected in the deviation detection
circuit 6 together with the digital input signal from the digital audio device. The deviation
detection circuit 6 detects the deviation between the digital input signal and the position signal B,
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converts the magnitude of the deviation into the thickness of the electric signal, and inputs it to
the drive unit 7, and the drive unit 7 is an air vibration element The mechanical amplitude
position of 8 is converted to vibrate air to obtain a 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 is a
digital input signal person and digital position It works so that the deviation from the signal B
becomes zero. すなわち、ととなる。
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 input signal A 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 subtraction circuit 1o compares the digital input signal
from the digital audio device with the digital position signal B, determines which signal is larger,
and determines 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 switching 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 several bits of digital signal,
and the most significant bit-MSB1, the least significant bit is called LSB and the significance is
shifted by one bit in the direction from MSB to LSB Make it IA each time. The resistance group
14 is assumed to have a resistance value of H in the MSB stage, and is configured to sequentially
become 2 values as going to the LSB direction. With this configuration, the larger the difference
between the digital output signal person and the digital position signal B, the larger the absolute
value of the drive current Σ, and the polarity switching switch 13 is switched depending on
which signal is larger. The flow direction of E will change. Although the drive device A is an
example of an electromagnetic drive device in this example, an electrostatic drive device, a device
that changes the air pressure by plasma or the like and drives can also be considered. In this
example, a magnetic flux is caused to pass through the inside of the yoke 17 by the permanent
magnet 16 and flows through the magnetic field and the yoke 17 generated by applying the
drive current E to the voice coil 2 @ wound around the voice coil bobbin 18 connected to the air
vibrating element 8. The air vibrating element 8-is driven by the action of the magnetic flux. The
position detector 9 is provided inside the voice coil bobbin 18 in this example, but may be
installed outside by connecting with a connecting rod or the like as long as it is interlocked with
the air vibrating element 8. The position detector 9 will be described with reference to FIGS. 4 (a)
and 4 (b).
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FIG. 4 (a) shows only the inside of the voice coil bobbin 18 of FIG. 3, and the supporter 19 is
fixed to the voice coil bobbin 18, and the hole 19a through which light is transmitted is provided
near the center of the supporter 19. The matrix 20 is fixed to the hole 191L. The matrix 20 is
provided with a pattern consisting of a portion for blocking the incident light from the light
source 21 and a portion for transmitting the light, and the light transmitted through the matrix
20 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 shown by a dotted line, the
position of the light spot of the incident light on the matrix 2Q changes. FIG. 4 (b) is a front view
of that portion, showing a 3-bit configuration as a simple example of the matrix 2o. Three light
receiving elements 221L, 22b. Each of the light sources 21a is denoted by 22a if it represents the
first bit (MSB), 22b indicates the second bit, and 22C ° indicates the bit of the third bit (I, SB).
The light receiving elements 22 & cir & 22b and 220 when the incident light of the 21b and 2IC
reaches the lowermost end of the matrix 20 sequentially as "001" "010" "011" "100" "101" "110"
"111" Change. Therefore, the vibration of the voice coil bobbin 1B, that is, the vibration of the air
vibration element 8 can be converted into a digital electric signal. Various kinds of position
detectors 9 can be considered, and as shown in FIG. 5 (A), a matrix 7 having a portion for
reflecting light and a portion for absorbing light is provided on the surface of the supporter 19.
Even if incident light is converted into an electric signal by the light receiving element 22
through the light i condensing lens 23 reflected by the matrix 20, as shown in FIG. 5 (b), the light
is reflected by the supporter 19 and reflected. It is also possible to use a matrix 2o consisting of a
part transmitting and a part transmitting the reflected light from the light source 21 and
converting it into an electric signal by the light receiving element 22 through the condenser lens
23. Also, various means can be considered such as making the asperities on the matrix and
utilizing the fact that the phase of the reflected wave of the matrix changes. 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. It has a Mad 1 Lix with a pattern for changing the
state of light incident on the light receiving element using optical properties such as transmission
9 phase change, interference, etc., and from this light source via this matrix A position detector
that supplies light to the light receiving element f and outputs the mechanical position of the air
vibration element as a digital position signal, a driving device for driving the air vibration
element, and a digital audio device. A deviation detection circuit detects a deviation between a
digital input signal and the digital position signal, outputs a drive current that is a deviation
signal according to the magnitude of the deviation, and supplies the drive current to the drive
device. An automatic control system configured to eliminate deviation from a digital position
signal is formed, and the air vibration element is placed at a mechanical position according to the
value of the digital input signal. By driving the serial drive, in which it is possible to obtain an
audio output corresponding to digital input signals.
Therefore, it is possible to obtain an audio output corresponding to a digital input signal from a
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digital audio device with a much simpler configuration than the conventional system. In addition,
since the automatic control system is configured with respect to the amplitude of the air
vibration element having an analog amplifier, it has an excellent advantage of being able to
obtain an audio output with extremely small distortion.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing the conventional example, FIG. 2 is a block diagram of one
embodiment of the speaker apparatus of the present invention, and FIG. 3 is a schematic block
diagram showing the specific embodiment. The figure shows a specific configuration example of
the position detector, where (A) is a side sectional view and (B) is a front view.
6 ····················································································································································· − Circuits 11
·········································································· · q, 1e ...... permanent magnet, 17 ...... yoke, 18 ...... voice coil
bobbin, 19 ... ... supporter, 20 ...... matrix 21 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·. Name of agent Attorney Nakao Toshio One person
1111 Figure 12 Figure 4 Figure 4 (4) tl / [[? )(エフ)/I
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