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JPS5641919

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DESCRIPTION JPS5641919
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the configuration of a
conventional amplifier, FIG. 2 is a view showing the configuration of an amplifier in which the
connection cord of the present invention is used, and FIG. 3 is a view of the connection cord of
the present invention It is a figure which shows a structure. 5 is a core wire, 6 is a shield wire
portion, 7.8 is a pin jack connection portion,? Reference numerals a, 7b, 8a and 8b denote
terminals, 9 denotes a pin jack connection portion, 9a denotes a positive side terminal, 10
denotes a lead wire, 9b denotes a negative side terminal, and 11 denotes a ground line.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection cord
for use in an amplifier, for example an audio stereo amplifier, 2, 2 / P / 22 bander. In general, an
amplifier, for example an audio nutereo amplifier, has a signal amplification system for the right
and left channels, and as shown in FIG. 1, signals after the left and right channels are amplified
through the first amplifiers (IL) and (IR), respectively, and then connected. The second amplifiers
(8L) and (SR) are input through the codes (2L) and (2R), respectively, and further amplified by
the second amplifiers. The ground structure of the amplification system described above
connects the start ends of the shield wire portions of the connection cords (2L) and (2R) in
common, and connects the ground terminals of the first amplifiers (IL) and (IR). The other end of
the shield wire is connected in common, and the second amplifier (3L) and (3R) are grounded to
the chassis together with the ground terminals of the second amplifier (3L) and (3R). , (2R) of the
shield wire portion (ground portion) has an impedance, and the ground potential and ground
impedance at the beginning and end of 8′′〃 ′ ′ 3 of the shield wire portion of the
connection cord are different. The signal current transmitted through the connection code (2L) of
the channel flows through the second amplifier (3L) to the signal reference point (d), and (ii)
through the signal base of the first amplifier (IL). The signal current at the same time through the
point (b) flows to the first amplifier via (c) signal reference point (IR) (b). For this reason, the
impedance of the shield wire portion of the connection cords (2L) and (2R) and the ground
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impedance become the common impedance of the amplification system, and crosstalk occurs
between the left and right channels. That is, from the electrical point of view, the impedance at
which the signal reference point (2) of the second amplifier (3L), (8R) is relative to the signal
reference point (i) of the first amplifier (IL), (IR) And a parasitic power supply exists in series with
this impedance due to the common impedance of other circuits etc. and induction by the circuit
current of other circuits, etc., therefore, the second amplifier (8 L) , (3R) input signal, this second
amplifier (3L), (8R) input signal), ''. An unnecessary parasitic signal component which is
determined by the four Bidannes, the above-mentioned impedance and the parasitic power
source appears, and there is a drawback that excellent characteristics can not be obtained in
terms of distortion, noise and the like. The present invention is a connection cord used in an
amplifier developed to improve such conventional defects, and will be described below with
reference to FIG.
First, an amplifier in which the connection cord of the present invention is used will be described
with reference to FIG. The same reference numerals as in the conventional example of FIG. 1
denote the same parts in FIG. The left and right channel amplification systems are provided with
feedback amplifiers (4L) and (4R), and the noninverting inputs of these amplifiers (4L) and (4R)
are commonly connected and connected to the signal reference point (i) and The input is
connected to the signal reference point (d) and the same potential (port) and (ch) respectively,
and the outputs of the amplifiers (4L) and (4R) are connected to the first amplifier (IL) via the
resistors RL and RR. And (IR), the feedback amplifiers (45 and 5 L), (4 R), and the first amplifiers
(IL) and (IR) are connected to the input side of (IR) and (IR). The gains to the ends of the
connection cords (2L) and (2R) are respectively set to rlJ. That is, unnecessary parasitic signal
components generated at the signal reference point (d) are positively fed back to the input side of
the first amplifiers (IL) and (IR) through the feedback amplifiers (4L) and (4R), and then The first
amplifier (IL) and (IR) output to the end of the connection cords (2L) and (2R) with a gain "1".
Therefore, to simplify and explain one amplification system, parasitic Assuming that the signal
component is 02 and the input voltage of the first amplifier (IL) is el, the voltage of the input end
of the second amplifier (3L) with respect to the signal reference point (i) is 1Sv2 is 1 = Ke Thus,
the input voltage of the second amplifier (3L) is V = V1-V. ) 6 = (K1−2) el, the parasitic signal
component e2 is canceled. That is, the signal reference point (a) of the first amplifier (IL) and the
signal reference point (d) of the second amplifier (3L) are equivalently at the same potential, and
hence the connection code (b) The impedances of the shield line portions of 2L and 2R are
equivalently set to 0 , so that the interference between the right and left channels as
described above is eliminated, and the crosstalk characteristic is improved. Next, the connection
cords (2L) and (2R) of the present invention used for such an amplifier have the structure shown
in FIG. In FIG. 3, the periphery of the core wire (5) is covered with a mesh-like shield wire portion
(6), and pin jack connection portions (7) and (8) are provided at both ends, and this pin jack
connection portion (7), In a conventionally known structure in which the positive side terminals
(7a) and (8a) of (8) are connected to the core wire (5) and the negative side terminals (7b) and
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(8b) to the shield wire portion (6), Another bin jack connection (9) is provided in the jack
connection (7) 7) A parasitic signal in which the positive side terminal (9a) of the binshack
connection (9) is provided along the connection cord (2L) Connect to the negative terminal (sb)
of the other pin jack connection (8), ie, the end of the shield wire (6), through a lead (10) for
transmitting the component, and a vinshack connection (9) Earth wire with the negative terminal
(9b) of) connected along connection cord F (2L) It is a structure connected to (11).
That is, the output of the first amplifier (IL) is supplied to the second amplifier (3L) through the
connection cord (2L), and a parasitic signal component generated on the ground side of the
amplifier (3L) is a pin jack connection The signal is transmitted to the positive terminal (9a) of
the Bin Shack connection (9) through the negative terminal (8b) of (8) and the lead 'line (lO), and
from this positive terminal (9a) As described above, the present invention covers the periphery of
the core wire (5) with a mesh-like shield wire portion (6), and the pin jack connection portion ( 7)
A structure provided with (8)-2) In the case of [7; 8], one bin jack connection (7) is provided with
another bin jack connection (9), and this binshack connection ((7) 9) through the lead # (10) to
the other terminal. The configuration is such that the 9811 terminal (8b) K connection of the
clock connection portion (8) is used, so that the parasitic signal component generated at the
signal reference point of the second amplifier is transmitted via the feedback amplifier and the
first amplifier. It is extremely convenient to use for an amplifier in which the input of the second
amplifier is 1 (Ill is fed back to Ill to cancel out the parasitic signal component, and the
characteristics of such an amplifier can be fully realized. Have the advantage of
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