KR0122498B1 - Hybrid prearrangement circuit - Google Patents

Abstract

A telecommunication system having a hybrid prearrangement circuit is disclosed. A telecommunication system comprises a multiplex apparatus and the hybrid prearrangement. A first and a second transformers(74,75) have each of center tabs and transmit and receives the multiplex signal to/from a multiplexor and a line. A third transformer is connected to a first side of each center tabs. A converter(73,80) is coupled to a second side of the third transformer, and converts a four-wire voice signal to a two-wire signal or converts the two-wire signal to the four sire signal. The converted signal is provided to the prearrangement circuit. Since the hybrid method utilizes the center tab of the transformer, the impedance matching between the carrier systems is easily established.

Description

Hybrid batting circuit

1 is a block diagram of a communication system to which the matching function is applied.

2 is a block diagram of a conventional batting circuit.

3A shows the parity of the multiplexed signal sequence.

3B is a waveform diagram of a sum signal.

3C is a multiplex signal sequence in which a sum signal is superimposed.

4 is a block diagram of a matching circuit according to the present invention.

The present invention relates to a matching circuit for emergency communication between wired and wireless transfer equipment in a communication system, and more particularly, to a hybrid matching circuit with simple implementation and easy impedance matching.

In general, the matching function is to provide emergency communication means irrespective of the operation of the equipment when constructing a line between wired and wireless carriers and when an error occurs in the multiple signal string transmission section.

FIG. 1 is a block diagram of a communication system that performs a matching function. The switch 10 performs a subscriber switching function in a domestic station, and the multiplexing / demultiplexing equipment muxing or demultiplexing a subscriber signal. ), A transfer device 30 for transmitting the multiplexed signal sequence, a matching circuit 40 for providing a matching function, a handset 50, and a line 60 through which the multiplexed signal sequence is transmitted and received.

The subscriber signal is multiplexed in the multiplexing / demultiplexing equipment 20 via a switch 10 and transmitted to a counterpart station through a transport equipment 30, and a batting signal overlaps with the multiplex signal sequence in the transport equipment 30. Is sent to the transport equipment (not shown). At this time, the matching circuit 40 in the conveying equipment of the other station separates the matching signal and provides a matching function between the two conveying equipment sections.

The above-described batting function will be described in detail with reference to the batting circuit shown in FIG.

The summation circuit 40 includes a handset interface unit 61 for converting a voice signal into an electrical signal and converting the electrical signal into a voice signal, a gain adjusting unit 62 for adjusting the size of the voice signal, and a signal other than the voice signal. And a low pass filter unit (hereinafter referred to as LPF: 63,64) for removing noise, a transformer unit 65 for superimposing a voice signal on the multiplexed signal sequence, and a transformer for passing multiplexed signal sequences of various subscribers to the line side. It is composed of a portion 66.

When the carrier equipment operator establishes a line or detects an abnormality of the equipment and makes a call to the handset 51, the voice signal is transmitted to the handset interface unit 61 → gain control unit 62 → first LPF 63 → Tx transformer ( Through the 66), the multiplexing signal sequence overlaps the batting signal, which is a coarse signal, and is transmitted to the opposite carrier. On the contrary, from the signal sequence superimposed on the multiplex signal sequence transmitted from the other side, the multiplex signal sequence is removed from the second LPF 64 via the Rx transformer 66, only the sum signal is extracted, and the gain control unit 62 and the handset interface unit. (61) inform the operator of the conveying equipment.

In the conventional batting function described above, since the transmitting and receiving of the batting signal were separated, two transformers were needed to superimpose and separate the battering signal, and the low frequency voice signal was carried through the capacitor, and the multiplexing signal, which is a high frequency signal, was used. Impedance matching was difficult between carriers that transmit and receive multiplexed signal streams by operating shorted lines.

Accordingly, an object of the present invention is to provide a hybrid matching circuit with simple implementation.

Another object of the present invention is to provide a hybrid matching circuit with easy impedance matching.

The present invention for achieving the above object is characterized in that it is configured to perform the matching function with the matching circuit existing in the other side of the transfer equipment by carrying a hybrid signal on the center tap of the transformer used to transmit and receive the multiplex signal sequence do.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram of a hybrid matching circuit according to the present invention, and the same reference numerals are used for the same components as those of FIG. The hybrid matching circuit includes a handset interface unit 61 for converting a voice signal into an electrical signal and conversely converting an electrical signal into a voice signal, a gain adjusting unit 62 for adjusting the size of the voice signal, and a signal other than the voice signal. And LPF units 63 and 64 for removing noise, and 4-wire audio signals having separate transmission and reception, are converted into two-wire signals having a mixture of transmission and reception signals, and vice versa. 2W / 4W converter 73 for converting mixed two-wire signals into four-wire signals having separate transmission and reception, and transformer 75 on the side of the matching circuit for carrying the signal on the side of the line where multiplexed signals are present. And a transformer section 74 on the multiplexed signal string side for receiving and exporting the beat signal on the side of the batting circuit.

First, when the carrier equipment operator performs the matching through the handset 51 in the matching circuit to perform the matching function when the equipment is installed, the line construction and the abnormality of the equipment, the voice signal is converted into an electrical signal through the handset interface unit 61. It is applied to the gain control unit 62. The gain control unit 62 adjusts the size of the voice signal and removes noise and unnecessary signals from the first LPF 63. Next, the 2W / 4W conversion unit 73 converts the signal into a 2-wire signal, and is applied to the center tap in the Tx transformer 74 on the multiplex signal string side via the transformer 75 on the side of the coupling circuit and transmitted to the counterpart carrier equipment. . On the contrary, the batting signal transmitted from the counterpart carrier equipment is separated into 4 wires by the Rx transformer 74 on the multiplex signal string side → the transformer 75 on the side of the mating circuit → 2W / 4W converter 73. The separated mating signal is received by the operator through the second LPF 64 → gain control unit 62 → handset interface unit 61.

As described above, the present invention uses a hybrid method using a center tap of a transformer, so that capacitors are removed from the line side to facilitate impedance matching between carriers. The advantage is that it can be implemented as is.

Claims (3)

A communication system having multiplexing equipment and a matching circuit, each having a center tap and having first and second transformers for transmitting and receiving the multiplexing equipment or lines and the multiplexed signal strings, and a primary side connected to the center tap. A third-wire and a four-wire audio signal connected to the secondary side of the third transformer and separated by a transmission / reception into a two-wire signal mixed with a transmission / reception signal or by converting a two-wire audio signal into a four-wire audio signal And a converting means for providing the sum circuit. The hybrid matching circuit of claim 1, wherein the matching circuit comprises a handset interface means connected to the handset for converting a voice signal into an electrical signal or converting the electrical signal into a voice signal. 3. The apparatus of claim 2, further comprising gain adjusting means for adjusting the size of the voice signal, and filter means for removing signals and noise other than the voice signal, connected between the converting means and the gain adjusting means. Hybrid batting circuit.