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DESCRIPTION JPS57192194

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DESCRIPTION JPS57192194
Specification 1. Loudspeaker system и ((Re-speaker and voltage control resistance element are
connected in series, its both ends connected in series as input end, the input end voltage is
divided by voltage divider, difference between this divided output and reference signal A speaker
system configured to control the voltage control resistance element.
2, the scope of claims
3. Detailed Description of the Invention The present invention has an object to control the same
wave number characteristic or distortion characteristic of a speaker without a power supply or
with a negligible power supply. Conventionally, in order to control the frequency characteristics
and distortion characteristics of the speaker, the vibration of the speaker is detected and then it
is fed back to the input end of the speaker or the current flowing to the speaker is detected. The
method of returning to the input end of the amplifier was taken. The disadvantage of these
methods is that they require a special amplifier, and it is not acceptable to use each of the 0
favorite amplifiers on their own. However, the ability to electronically improve the speaker
characteristics can be evaluated, and there are some that can not be technically discarded, and
the present invention provides means for solving these problems. FIG. 1 is a principle view of the
present invention according to the drawings, in which an FET is used as a voltage control
resistance element 3 and a voltage divider is constituted by a series voltage divider of impedance
elements z1 and z2. The voltage divider difference of the voltage divider is made at the
differential amplifier 4 and added to the gate of the FET. By the way, since the FET 3 has the
same structure of north and drain, it works normally as a resistive element whether the input
signal e1 is positive or negative. Here, the reference signal is an input signal between es и 1-1 ?
and the impedance of the speaker 2 is 23. Let the gain of the gate-source voltage 3v GS1 of the
FET 3 be A, and the source-tray / FET resistance be R (VGS). Then, the current flowing through
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the speaker and vGs? become K as follows. It can be understood that the current i flowing
through the speaker is controlled by the reference signal e8, from the equations 41-1 + R (light)
(1) VGS = A (es-iTTiI 4 (2) (1), (2). The control characteristics change depending on what signal is
used as the reference signal. FIG. 2 shows another embodiment of the present invention, and the
same reference numerals as in FIG. 1 indicate the same contents. In this embodiment, it is used as
the output reference signal e8 of the microphone 5 placed in front of the speaker. . The voltage
dividing ratio of the voltage divider composed of the impedance element Z and z2 is z2 / (z, + z2).
Assuming that the gain A of the differential amplifier and the grating is sufficiently large, the
following equation is obtained from the equation (2). k et al.-lower lower ? ei (+ 3) e 8 is an
amount proportional to the microphone output, that is, the speaker reproduction sound pressure,
but in equation (3), the speaker reproduction sound pressure is proportional to the input signal
e1 multiplied by the voltage division ratio It shows that you do. From this example, it can be seen
that the frequency characteristics of the speaker can be controlled and distortion of the speaker
reproduction sound is improved.
The reason is that the relationship between the human power signal e1 and the sound pressure is
(3), and no characteristic relating to the speaker is included in this case, which is a general
property of negative feedback. In the embodiment shown in FIG. 3, the acceleration pickup 6 is
attached to the diaphragm of the speaker, and the output is used as a reference signal e8. The
operation of this embodiment is the same principle as that described in the embodiment of FIG.
2, and the control of the frequency characteristics of the vibration acceleration of the diaphragm
(which is proportional to the sound pressure) is performed, Be improved. In the embodiments of
FIGS. 2 and 3, when the voltage division ratio Z2 / (Z, + Z2) is selected to approximate the
frequency characteristics of the speaker, the frequency characteristics of the speaker after being
controlled and the frequency characteristics of the speaker alone can be obtained. Since the
difference between them is small, the terminal voltage of the speaker has a substantially constant
amplitude under control. As a result, the voltage applied to the voltage control resistive element
can be made constant and minute, and power loss in the voltage controlled resistive element can
be minimized. In the embodiment shown in FIG. 4, the current flowing through the speaker is
detected by using a voltage control resistance element as the impedance element Za, and this is
used as a reference signal. (2) If A ? ? in A, the following equation is obtained. EndPage: 2Z2'Z1
+ 22 "(1) Further, in the present embodiment, es = i.multidot.Z4 (5), so that (4) and (5) are
obtained. Equation (6) indicates that the speaker is driven at a constant current. From equation
(6), it can be seen that the impedance z3 of the speaker is not included, so z3 is non-linear and
the Temosby force current is not distorted. If the impedance element z4 and the speaker
impedance z3 are similar to each other and z1 and 22 are resistances in this embodiment, the
voltage (iXZ3) of the speaker terminal is as follows. Alternatively, if z4 is a resistor and the
voltage divider ratio of Zl and 22 is similar to the speaker impedance Z3 non-inverted, then the
voltage at the speaker terminal is also expressed by equation (7). Ru. In either case, the voltage at
the speaker terminal is constant. As a result, the voltage applied to the voltage control resistive
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element can be made constant and minute, and it is possible to minimize the power loss in the
voltage control resistive element. The embodiment of FIG. 5 has a configuration in which the
differential amplifier in the embodiment shown in FIG. 4 is removed. Also in this embodiment, the
gate-to-source voltage vGs of the FET 3 which is a voltage control resistance element is the
difference of the terminal voltage of the divided impedance element z4 of the voltage divider, and
the special voltage of A21 in equation (2) In the case, the basic effect is the same as the
embodiment shown in FIG.
However, there is an advantage that no differential amplifier is required. Although the present
invention has been described with reference to FIGS. 1 to 5 above, although the control circuit
according to the present invention does not amplify power, part of the power of input signal e1 is
consumed by the voltage control resistance element You can understand that it is to control and
improve frequency characteristics and distortion characteristics by controlling consumption. FIG.
6 shows the result of experimentally confirming the effect of the present invention. The
impedance z3 of the speaker 2 is approximately 9 ? and 100 ?, and is approximated as a nonlinear load by series-parallel connection of diodes. zl, z2. z4 was a resistor, A-132 manufactured
by Microtick Inc. was used for the differential amplifier 4, and a 660 FET was used for the desk
28 for the voltage control resistance element 3. The input voltage 11 is a sine wave, and the
distortion level is -80 dB. At this time, the voltage at point 0 is -80 dB distortion level despite the
non-linearity of z3. On the other hand, the voltage at point 0 is asymmetrical due to the nonlinearity of z3 and its distortion is extremely large. By this experiment, it was confirmed that the
current flowing through z3 was controlled finely and was not distorted. By the way, the speaker
impedance z3 largely changes depending on the power applied to the speaker. The reason is that
the temperature of the voice coil changes from normal temperature to a temperature range of
100 ░ C. to 20 (1 ░ C.). In the above embodiment, if Z3 becomes too small, control can not be
performed unless the resistance of the voltage control resistive element is made negative. ???
?????????? Alternatively, Zl should have the same temperature and temperature
characteristics as the speaker impedance. As means for achieving that, it is necessary to use the
fact that the current flowing in z4 is the same as the speaker current, or that the current flowing
in Z and the speaker current are approximately proportional, and the impedance element of Z or
z4 It is sufficient to make 21 or z4 out of a resistor having the same temperature characteristics
as the voice coil winding, by reducing the heat capacity of. The embodiment of FIG. 7 relates to
the power supply of the differential amplifier 4 which has been described in the previous
embodiments. In a voltage controlled resistive element using FKT, the output of the differential
amplifier is connected to the gate of the FET and requires very little current. That is, the
differential amplifier itself does not require much power supply current and only voltage.
Therefore, as shown in FIG. 7, it is possible to rectify the human power signal gi and use it as the
power supply of the differential amplifier 7, and with this EndPage: 3, the present invention
operates without any power supply. The control amplifier will be realized.
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FIG. 8 shows another embodiment in which the electromotive force of the photoelectric cell 7 is
used as the power source of the differential amplifier. Other than this, even if it has a weak
electromotive force, it is effective as a power supply of the differential amplifier. FIG. 9 shows an
embodiment of a voltage control resistance element using a transistor. By connecting PNP and
NPN transistors in parallel, current can flow in both directions between collector and emitter, and
it has symmetrical characteristics in both directions. If the transistor AFE is made large enough, it
works the same as FET.
2, the scope of claims
Although the detailed description of the present invention has been made above, it will be
understood that it is possible to rationally control such a large power that drives a speaker with
extremely weak power. Further, since the power consumed by the voltage control resistive
element is small, the size of the control portion can be made extremely small in the speaker
system according to the present invention.
4. Brief description of the drawings FIG. 1 shows the principle of the present invention, FIG. 2
shows an embodiment of the present invention using a microphone, and FIG. 3 shows an
embodiment of the present invention using an acceleration detector. FIG. 4 shows an example,
FIG. 4 shows an embodiment of the present invention for detecting a speaker current, FIG. 5
shows an embodiment of the present invention without differential up, and FIG. FIG. 7 shows an
example of experimental results of the present invention, FIG. 7 shows an embodiment of a
power supply of a differential amplifier, and FIG. 8 shows an embodiment using a solar cell as a
differential amplifier power supply, 9 The figure is a figure which shows the Example of the
voltage control resistive element which used the transistor. 2 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
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и differential amplifier, 5 и Microphone, 6 и и и и и и и и Acceleration detector. Patent Assignee
Matsushita Electric Industrial Co., Ltd. Agent Hoshino Hoshino Figure 1 Figure 6 Figure 2 Figure
3 Figure 4 End Page: 4 Figure 5 Figure 7 Figure 6 Figure 8--"I-mudo 2 / l: 13EndPage: ?
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