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JPS55149594

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DESCRIPTION JPS55149594
Description 1, title of the invention
Speed detector in motional feedback device
3. Detailed Description of the Invention The present invention provides a selective feedback from
the output side to the input side of the amplifier to increase the gain of the amplifier in the low
frequency region to 7 and to a speaker driven by the amplifier. A speed detector in a motional
feedback device adapted to feed back a signal proportional to acceleration or velocity or
amplitude to the amplifier through a coupled vibration detector network, provided separately
from the output of the amplifier Connect the input side of the bridge circuit consisting of one
speaker and 3 resistors to the output side of the amplifier, and connect the input side of the
operational amplifier to the output side of the bridge circuit. The speed voltage generated in the
bridge circuit can be amplified by the operational amplifier. In general, a motional speaker is
driven by an amplifier, the motion of the speaker vibration system is detected by a vibration
detector, and a characteristic of differential or integral is given to return to the amplifier to
obtain a target sound reproduction characteristic. In the feedback device, speed detection is
conventionally performed as shown in FIG. That is, the signal from the signal source 1 is
amplified by the amplifier 2 to drive the speaker 3 but the speaker 3. In the speed detector in the
dotted line consisting of a bridge circuit constituted by a resistor ayst6 and a transistor 7 for
amplifying an unbalanced voltage EndPage: 1, a voltage Ev-KB7v (K: coefficient, B : Magnetic flux
density, t: Voice coil length, ? = speed) occurred, and the speed of the speaker could be detected.
This method is a simple and convenient method, but has the following drawbacks because the
amplification of the detection voltage (unbalanced voltage) is performed by the transistor. That
is, in the case of a device such as a car stereo or radio which wants to obtain a large maximum
output with limited power supply voltage, balanced amplification using two amplifiers is
07-05-2019
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performed, but in the configuration of FIG. There was an inconvenience that could not be
amplified or caused oscillation. In addition, 8 is resistance. The present invention eliminates such
conventional drawbacks and one embodiment is shown in FIG. FIG. 2 is a circuit diagram of the
speaker speed detection in the balanced amplification connected sound reproduction system. In
the figure, the signal from the signal source 11 is amplified by the amplifier 12a and the speed
detector in the dotted line is shown. Also, by the phase reverser 13 and amplifier 12b, the signals
in reverse phase to the signal from amplifier 12a are similarly applied to the speed detector and
four times as compared with the case of amplifier 12a or 12b alone. And the input impedance of
the operational amplifier 14 for amplifying the speed voltage is very large and hardly attenuates
the outputs of the amplifiers 12a and 12b.
As a result, car stereo with limited supply voltage. It is also possible to reproduce a large output
of bass on a radio or the like. The speed detector in the dotted line in FIG. 2 is a bridge circuit in
which one speaker 15 and three resistors 16 and 17.18 are bridge-connected, and the input side
is connected to the output side of the bridge circuit. The input side of the speed detector, that is,
the input side of the bridge circuit is connected to the output side of the amplifiers 12a and 12b,
and the output side of the speed detector, that is, the calculation. The output side of the amplifier
is led to the feedback port / ? (? circuit). As described above, according to the speed detector of
the present invention, high-power bass reproduction can be performed, and the effect is
enhanced when applied to a car stereo, radio, etc., which has a limitation of the power supply
voltage. It is a thing.
4. Brief Description of the Drawings FIG. 1 is a circuit diagram of a motional feedback device
having a conventional speed detector, and FIG. 2 is a circuit diagram of a motional feedback
device having a speed detector according to the present invention. 11 иии Signal source, 12a, 12b 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 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 ... ... Speaker, 16,
17. 18. ... ... Resistance. Name of agent Attorney Nakao and others 1 person Figure 1 Figure 2
EndPage: ?
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