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JPS57131013

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DESCRIPTION JPS57131013
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are circuit diagrams of a conventional
sound reproducing apparatus. FIG. 3 is a circuit diagram of one embodiment of the present
invention. 2 иииииииииииииииииииии Speakers 3 and 4 иииииииииии Speaker code, 5 and 6 ииииииии Sensor code, 8
ииииииииииииииииииииииииииииииии Inverting amplifier main body, 2a: hot, individual input terminal, 2b: cold side
input terminal.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sound
reproduction device in which distortion due to the influence of a speaker cord is reduced. In the
sound reproduction device, impedance i ") / 3/7 7 J, ... of the connection line (speaker cord)
between the amplifier and the speaker. ? 5129 (? makes the distortion of the sound
reproduction device worse. For this reason, the conventional sound reproducing apparatus is
configured as shown in FIG. 1 or FIG. 2 at a loss. The sound reproducing apparatus shown in FIG.
1 connects the output terminal 1a of the amplifier 1 to the hot side input terminal 2a of the cis
beaker 2 by the speaker cord 3 and the cold side input terminal 2b of the speaker 2 by the
speaker cord 4 The voltage of the hot side terminal 2a of the speaker 2 is negatively fed back to
the amplifier 1 through the sensor cord 5 and connected to the common terminal of the positive
and negative power supply, and the cold side terminal 2b of the speaker 2 is through the sensor
cord 6 , And including the speaker cords 3 and 4 in the negative feedback loop. However,
according to the conventional sound reproducing apparatus shown in FIG. 1, although distortion
due to the impedance of the speaker cord can be suppressed, a plurality of power supplies
having independent grounds are required, and there has been a drawback that the treatment of
the earths is difficult. ?? In the sound reproducing apparatus shown in FIG. 2, the output
terminal 7a of the amplifier 7 is connected to the hot side input terminal of the speaker 2 by the
speaker cord 3. The IK connection is made, the cold side input terminal 2b of the speaker 2 is
connected to the reference potential point (earth) of the amplifier 7 by the speaker cord 4, and
the voltage of the cold side terminal 2b of the speaker 2 is sent to the amplifier 7 through the
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sensor cord 6 Positive feedback to suppress distortion due to the impedance of the speaker cord.
However, according to the conventional sound reproducing apparatus shown in FIG. 2, the
processing of grounding may be similar to that of a normal amplifier, but only the speaker cord 4
side is detected, so the impedance of the speaker cord 3 is the impedance of the speaker cord 4
Otherwise, there is a drawback that the distortion due to the impedance of the speaker cord can
not be suppressed. The present invention has been considered above, and the above-mentioned
drawbacks are eliminated, and the grounding of the amplifier can be treated in the same manner
as a normal amplifier, and the impedance of the speaker cord differs between the hot side and
the cold side: 3) ? It is an object of the present invention to provide an audio reproduction
apparatus capable of suppressing the occurrence of distortion due to the impedance of the
speaker cord even when: / z).
Hereinafter, the present invention will be described by way of examples. FIG. 3 is a circuit
diagram of one embodiment of the present invention. In this embodiment, the amplifier 8
comprises a noninverting amplifier body A, resistors 9 and 10 for positive feedback, and resistors
11 and 12 for negative feedback, and the output terminal of the noninverting amplifier A is the
output of the amplifier 8 One end of the resistor 12 is connected to the sensor terminal 8c, and
one end of the resistor 10 is connected to the sensor terminal 8d. The output terminal 8a of the
amplifier 8 is connected to the hot side input terminal 2a of the speaker 2 through the speaker
cord 3, and the cold side input terminal 2b of the speaker 2 is the output of the amplifier 8 to the
reference potential point (earth) of the amplifier 8 through the speaker cord 4 Connect via
terminal 8b. Meanwhile, the potential of the hot side input terminal 2a of the speaker 2 is
connected to the resistors 11 and 12 by connecting the hot side input terminal 2a of the sbeka 2
through the sensor cord 5 to one end of the resistor 12: 7. A feedback amplifier is constructed to
be fed back to the inverting input terminal of the inverting amplifier main body A. The cold side
input terminal 2b of the speaker 2 is connected to one end of the sensor cord 6 through one end
of the resistor 10, and the potential of the cold prepared input terminal 2b of the speaker 2 is
nonreversal input terminal of the noninverting amplifier body A by the resistors 9 and 10.
Configure to give feedback to In the present embodiment configured as described above, since
the potential of the hot side input terminal 2a of the speaker 2 is negatively fed back to the noninverting amplifier main body A, the impedance of the speaker cord 3 is a part of the negative
feedback loop. There is no adverse effect on distortion due to the impedance of the speaker cord
3 formed. Further, the potential of the cold side input terminal 2b of the speaker 2 is positively
fed back to the non-inverting amplifier main body A, so that the speaker cord 4 forms a part of a
positive feedback loop, and the output impedance of the amplifier 8 is The shift to the side 9
eliminates the adverse effect on the distortion due to the impedance of the speaker cord 4. Now,
the conditions for achieving the in (5) dB 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 ?? ?? First, it is assumed that current flows in the speaker cord 4 and the
potential of the cold side input terminal 2b of the speaker 2 becomes n due to the impedance of
the speaker cord 4. This potential is positively fed back to the noninverting amplifier body A by
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the resistors 9 and 10. Here resistance 9.10. Let the resistances of il and 2 be R9% R10- "11 and
R12 respectively.
The potential V gain m is 80 times N (Rtz + Rt2) / Rtt times and appears at the hot side input
terminal 2a of the speaker 2. If this voltage appearing at the hot side input terminal is equal to
{square root over (2)}, the potential between the input terminals 2as 2b of the speaker 2 is not
influenced by the impedance of the speaker cord 4. That is, the relationship of R9R11 + R12 "R9
+ R10" R07 = V should be satisfied. Therefore, in the case of R12 / R11R12 / R11, the above
relationship is established, and the impedance between the input terminals 2a and 2b of the
speaker 2 becomes zero. In this case, the speaker cords 3 and 4 do not have any influence on
distortion by the impedance 11 (6), J1340 of the dance and there is no force. As described above,
in this embodiment, both of the voltages generated by the impedances of the speaker cords 3 and
4 are detected, and there is no difference even if the impedances of the speaker cords 3 and 4
are not the same. Also, the grounding process may be the same as that of a conventional
amplifier, and the grounding does not require two independent power supplies. As described
above, according to the present invention, the grounding process may be similar to that of a
conventional ordinary amplifier, and the occurrence of distortion due to the impedance of the
speaker cord can be suppressed, and the speaker cord connected to the cold side input terminal
of the speaker Even in the case where the impedance of the speaker cord and the impedance of
the speaker cord similarly connected to the hot side input terminal are different, an increase in
distortion due to the impedance of the speaker cord is prevented.
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