JPH01159437U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a telephone circuit system, Fig. 2 is a conventional 2-wire/4-wire conversion circuit diagram, Fig. 3 is a conversion circuit diagram showing an embodiment of this invention, and Figs. 4 and 5 are the same. 6 and 7 are equivalent circuit diagrams of the receiving system, FIG. 8 is an equivalent circuit diagram for explaining attenuation correction, and FIG. 9 is a diagram showing attenuation characteristics. 10 and 11 are circuit diagrams showing other embodiments. In the figure, T is a transformer, Z ₁ to Z ₄ are impedances, A _mp1 is an amplifier, and A _mp2 is a differential amplifier.

Amendment 1.4.12 Hei 1. The name of the invention is amended as follows. Title of the invention: Electronic hybrid circuit The claims for utility model registration and the brief description of the drawings are amended as follows.

[Claims for Utility Model Registration] (1) A two-wire circuit, a four-wire circuit in which an input line and an output line are formed individually, and a transformer whose primary side is connected to the load of the two-wire circuit, a first impedance circuit Z ₃ on the secondary side of the transformer for matching when viewed from the two-wire circuit side;
a second impedance circuit Z2 having an impedance equivalent to the impedance obtained by converting the load of the line circuit to the secondary side; and a second impedance circuit _Z2 that satisfies the equilibrium condition between the first and second impedance circuits and the secondary side of the transformer. 3 impedance circuit Z ₄ is connected to form a bridge circuit; the signal from the 2-wire circuit is transmitted from the middle of the first impedance circuit Z ₃ and the middle of the third impedance circuit Z ₄ to the output line. sending the signal from the input line to the connection point between the first and third impedance circuits Z ₃ and Z ₄ and between the connection point between the secondary side of the transformer and the second impedance circuit; In the electronic hybrid circuit, the electronic hybrid circuit is matched and terminated with a complex impedance consisting of a transformer, a capacitor, and a resistor, and the first impedance circuit _Z3 and the third impedance circuit _Z4 form part of the complex impedance. An electronic hybrid circuit characterized in that the resistor is a variable resistor, and attenuation distortion is corrected by taking out a voltage-divided output from an intermediate point thereof . (2) The first impedance circuit _Z3 includes a pad circuit for adjusting the balance of the bridge circuit according to the line resistance of the two-wire circuit. The electronic hybrid circuit described in item 1).

[Brief Description of the Drawings] Fig. 1 is a diagram showing a telephone circuit system, Fig. 2 is a conventional 2-wire/4-wire conversion circuit diagram, Fig. 3 is a conversion circuit diagram showing an embodiment of this invention, and Fig. 4 is a diagram showing a conventional 2-wire/4-wire conversion circuit. Figure 5 is an equivalent circuit diagram of the transmitting system, Figures 6 and 7 are equivalent circuit diagrams of the receiving system, Figure 8 is an equivalent circuit diagram for explaining attenuation correction, and Figure 9 is an equivalent circuit diagram of the receiving system. Figures 10 and 11 showing attenuation characteristics are circuit diagrams showing other embodiments. In the figure, T is a transformer, Z ₁ to Z ₄ are impedances, A _mp1 is an amplifier, A _mp2 is a differential amplifier, C ₂ , C ₃ , C ₄ are capacitors, R ₂ , R ₃ ,
_R4 is a resistor, _P3 and _P4 are variable resistors, and PAD is a pad circuit.

Claims (1)

[Claims for Utility Model Registration] (1) A two-wire circuit, a four-wire circuit in which an input line and an output line are formed individually, and a transformer whose primary side is connected to the load of the two-wire circuit, a first impedance circuit Z ₃ on the secondary side of the transformer for matching when viewed from the two-wire circuit side;
a second impedance circuit Z2 having an impedance equivalent to the impedance obtained by converting the load of the line circuit to the secondary side; and a second impedance circuit _Z2 that satisfies the equilibrium condition between the first and second impedance circuits and the secondary side of the transformer. 3 impedance circuit Z ₄ is connected to form a bridge circuit; the signal from the 2-wire circuit is transmitted from the middle of the first impedance circuit Z ₃ and the middle of the third impedance circuit Z ₄ to the output line. sending the signal from the input line to the connection point between the first and third impedance circuits Z ₃ and Z ₄ and between the connection point between the secondary side of the transformer and the second impedance circuit; An electronic hybrid circuit characterized in that a signal at a midpoint between the first and third impedance circuits Z ₃ and Z ₄ can be adjusted by a potentiometer. (2) The first impedance circuit _Z3 includes a pad circuit for adjusting the balance of the bridge circuit according to the line resistance of the two-wire circuit. The electronic hybrid circuit described in item 1).