RU2027307C1 - System for transmitting additional information along wire broadcasting line - Google Patents

Abstract

FIELD: communication technology. SUBSTANCE: electric circuit formed between two wires of any line and electric "earth" is used as two-sided channel for transmitting additional information at sections of wire broadcasting line concluding ducts for transmitting control signal being available. Basic lines of broadcasting signals are used for interval between transformed substation of wire broadcasting and user of wire broadcasting. Ancillary control line available is used between transformer substation of wire broadcasting and central station of wire broadcasting. System has central station of wire broadcasting 1, program feeding line 2, duct feeders 3, distributing feeders 4, user lines 5, amplifiers 6, feeder transformers 7, transformer substations 8, user transformers 9, two-wire connecting lines 10, restricting resistors 11, user jacks 12, user receivers 13, user additional information transceivers 14, units 15 for connecting common transceivers, collection and processing units 17, conjugation units 18, user's transformers traversal units 19. System provides good separation of signals of transformer substations and signals of additional information without mutual noises due to the fact that the signals pass through different circuits: signals of transformer substation pass through physical circuits of two-wire lines and additional information signals pass through the circuit - two wires-earth. Influence of signals of users one to another is eliminated by using address codes of users and by means of application of time and frequency separation of signals. EFFECT: improved reliability; improved efficiency of operation. 1 dwg

Description

 The invention relates to telecommunication systems and is intended to be used as a system for two-way communication between subscribers of an extensive telecommunication network and a common center.

 There are known systems for transmitting information from a common center over a radially branched network to subscribers of this network, for example, urban three-link wire broadcasting (PV) networks, and in recent years, PV networks, as a rule, are three-program networks with frequency division of program signals. However, these systems are systems for one-way transmission of general information from a common center to each subscriber. Given the peculiarities of the frequency compression of MF networks by signals of three programs and the high power level of the signals of the first program, it is quite difficult to create a two-way communication system on the main paths of the MF network using frequency multiplexing. At the same time, the task of creating such a system based on the PV network is very relevant. Urban networks of PV, especially large cities, have unique features, such as a large network capacity and non-switching (at the distribution network level and below) of the channels for delivering programs to subscribers. These are great advantages even compared to the GTS.

 The proposed system, due to a new set of features, ensures the preservation of the indicated advantages of the PV network and allows simple means to ensure two-way exchange of information between subscribers of the PV network and the common center without interruption in broadcasting and without mutual interference.

 For this, it is proposed to use an electric circuit: two PV wires - ground in sections of the PV network paths. The use of such electric circuits (phantom, artificial) is known (Picard circuit), but their use for creating two-way end-to-end communications between subscribers of the PV network and the common center is not known.

 The subscriber lines of the PV (excluding the stray complex resistance of wire leakage to ground) are symmetrical electrical circuits relative to the electrical "ground" (to which, for example, the neutral wire of the household power network is connected). The broadcast signal currents are closed in physical circuits, i.e. along the chains between the two wires of the subscriber line PV.

 The drawing shows a diagram of the proposed system for transmitting additional information on the network PV.

 The system contains a central station 1 PV, program supply lines 2, trunk feeders 3, distribution feeders 4, subscriber lines 5, amplifiers 6, feeder transformers 7, transformer substations 8, subscriber transformers 9, two-wire connecting lines 10, limit resistors 11, subscriber sockets 12, subscriber receivers 13, transceivers 14 of additional subscriber information, blocks 15 for connecting common transceivers 16, blocks 17 for collecting and processing information and blocks 18 for pairing, blocks 19 for bypass x transformers.

 The proposed system works as follows.

 At the central station 1 PV or at transformer substation 8, polling address signals are generated for subscribers. Upon receipt of such a signal, a specific subscriber answers. The subscriber may also transmit periodic priority information on his own initiative.

 The shapers of the necessary address and information signals are part of the transceivers 14 of additional information of subscribers and as part of the common transceivers 16 having three-wire circuits: input - output. The potential difference of the electrical signals of additional information, therefore, is removed and transmitted between the two wires equipotential for these signals and the electrical "ground" for both transceivers, the connection with which is really ensured by grounding all the necessary equipment at the PV network facilities.

 The subscriber transformer bypass blocks 19 provide electrical signals for complementary information to bypass the subscriber transformer 9, for example, by means of two successive resonant circuits contained therein tuned to the carrier frequency of the additional information signals and connecting each terminal of the primary and secondary windings of the subscriber transformer respectively.

 The common transceiver connection blocks 15 also communicate with the electrical ground to provide a closed electrical circuit for additional information signals. They can contain frequency-dependent circuits, and in the simplest case they can consist of two series-connected active linear resistors connected between the wires of the common buses of the distribution feeders 4, and the connection point of these resistors through the third resistor must be connected to the ground and to the input- output of a common transceiver 16.

 Blocks 17 of the collection and processing of information provide the implementation of the necessary algorithm for the exchange of information and can be implemented on the basis of hardware and software (for example, computers). The coupling units 18 contain the necessary switches and attenuators, since the only connecting line 10 between the central station of the MF and the transformer substation 8 is loaded with many signals for its main purpose, i.e. control and monitoring signals.

 As variants of the proposed system, it is possible to use current tansformators in it, connected between each distribution feeder 4 and feeder transformer 7, one winding in each wire, and for winding signals these windings are out of phase, and for additional information signals in phase. Individual current transformers allow receiving signals from different distribution feeders simultaneously, i.e. the speed of information exchange and the security of the transmission of these signals from a possible malfunction of the distribution feeder 4 from grounding of one wire thereof are increased.

 In addition, with the optimal choice of the carrier frequency of the additional information signals, it is possible to use its own inter-winding capacitance as a bypass unit of the subscriber transformer 19, as well as to form a multichannel network for transmitting additional information using the frequency multiplexing of the proposed system.

Claims (1)

 WIRELESS BROADCASTING INFORMATION TRANSMISSION SYSTEM, containing a central wire broadcasting station (DSPV), to which program supply lines are connected, connected through amplifiers to main feeders, connected to the primary windings of feeder transformers of transformer substations, connected to distribution feeders, as well the wires of which through the limiting resistors are connected to the terminals of subscriber sockets to which the subscriber receivers are connected, characterized the fact that transceivers of additional information of the subscriber are connected to it, connected to terminals of subscriber sockets and grounded, a bypass block of subscriber transformers connected to distribution feeders and subscriber lines, while at the transformer substations, a transceiver connection block connected to distribution feeders and a secondary winding of the feeder is introduced transformer and grounded, as well as connected through a grounded common transceiver to the unit for collecting and processing information, with union of a grounded via the interface block with a connecting line connected to TSSPV, which is also grounded.