WO1982002639A1 - Systeme de commutation - Google Patents

Systeme de commutation Download PDF

Info

Publication number
WO1982002639A1
WO1982002639A1 PCT/NL1982/000001 NL8200001W WO8202639A1 WO 1982002639 A1 WO1982002639 A1 WO 1982002639A1 NL 8200001 W NL8200001 W NL 8200001W WO 8202639 A1 WO8202639 A1 WO 8202639A1
Authority
WO
WIPO (PCT)
Prior art keywords
signals
exchange
selecting
scanning
subscriber
Prior art date
Application number
PCT/NL1982/000001
Other languages
English (en)
Inventor
Bv Deltakabel
Original Assignee
De Roo Minno
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by De Roo Minno filed Critical De Roo Minno
Publication of WO1982002639A1 publication Critical patent/WO1982002639A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
    • H04Q9/14—Calling by using pulses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17345—Control of the passage of the selected programme
    • H04N7/17354—Control of the passage of the selected programme in an intermediate station common to a plurality of user terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N2007/17372—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal the upstream transmission being initiated or timed by a signal from upstream of the user terminal

Definitions

  • the invention relates to a switching system, comprising an exchange and subscriber stations connected to said exchange through a cable network, whereby each subscriber station comprises selecting means for generating selecting signals for selecting one out of a number of program or data signals available in the exchange, which selecting signals are stored into a buffer register, and the exchange comprises scanning means for scanning the buffer registers and control means for deriving control signals from the selecting signals read out of said buffer registers fopr controlling switching means in the exchange such that the program or data signals selected by means of the selecting signals are transferred from the exchange through the cable network to the subscriber concerned.
  • Such a switching system is already known and can be used for transferring television signals from an exchange to televsion receivers, installed in the connected subscriber stations. However, such systems can also be used for transferring radio signals, data signals etc. In the following special reference will be made to a system for selecting television signals.
  • Each of the subscribers in a television system has selecting means, for instance in the form of a key board, by means of which one out of n television programs can be selected.
  • the selecting signals generated by said selecting means are transferred over the cable network to the exchange and are there stored in a buffer register. Scanning means in the exchange are sequencially scanning all the buffer registers.
  • the read out selecting signals are supplied to control means for deriving control signals from these selecting signals for controlling switching means in the exchange such, that the program selected by a subscriber is transferred to said subscriber.
  • Said switching means comprise for each subscriber in principle n in general electronic switches, each with the input connected to one out of n program signal bus lines, whereby the outputs are parallel connected to the concerned subscriber output.
  • the object of the invention is now to change the configuration of a switching system of this type such, that the possibilities of the switching system are significantly increased.
  • said object is in a switching system of the above mentioned type achieved in that said buffer registers for the selecting signals are positioned into the subscriber stations, the scanning means are sequencially transferring scanning signals via the cable network to each of the subscriber stations, and the buffer registers are activated by said scanning signals to transmit the therein stored signals.
  • the subscriber stations would transmit selecting signals on their own initiative to the exchange asynchronously with the operation of the scanning means.
  • the subscriber station are passive and the selecting signals generated by the selecting means in each subscriber station are stored into a buffer register which is located in the subscriber station itself.
  • the selecting signals are transferred to the exchange only after the scanning means have transmitted a scanning signal from the exchange to the buffer register in the subscribdr station. Only then the buffer register is activated to transmit the stored information through the cable network to the exchange.
  • digital shift registers can be used which after reception of a scanning signal transmit the stored information in a serial form. If necessary the digital output signals can be modulated in a modulator between the buffer register and the subscriber terminal.
  • a special code is stored into the buffer register during or after transmission of the input of said buffer register to the exchange.
  • a preferred embodiment of the switching system according to the invention is characterized in that in stead of selecting signals also condition signals or data signals which arew not related to program selection can be stored into the buffer registers, which condition or data signals can be transferred to the exchange in the same as the selecting signals, whereby the exchange comprises means for distinguishing between said selecting signals and the condition signals or data signals.
  • FIG. 1 illustates a principle schematic diagram of a switching system according to the invention.
  • the switching system illustrated in Fig. 1 comprises an exchange 1 to which a number of subscriber stations is connected of which in the figure only two stations are illustrated, the subscriber stations 2a and 2m.
  • the subscriber stations 2a... 2m are connected to the exchange 1 through cable connections 7a... 7m.
  • all the available program signals are supplied through signal inputs 4a, 4b... 4n to bus lines 5a, 5b... 5n.
  • the exchange 1 comprises switching means 3a... 3m by means of which a connection can be realized between one of said bus lines 5a, 5b... 5n and the related subscriber output 6a... 6m of the exchange.
  • Said switching means contain in principle n switches of which one at a time can be closed.
  • said switching means 3a can be used for realizing a connection between one of the lines 5a... 5n and the subscriber output 6a
  • the switching means 3m can be used for realizing a connection between one of the bus lines 5a... 5n and the subscriber output 6m.
  • Each of the subscriber stations contains a television receiver 20a, 20m connected to the subscriber terminal 23a, 23m, and furthermore selecting means 21a, 21m which through buffer registers 22a, 22m are also connected to the subscriber terminal 23a, 23m.
  • the television receivers 20a, 20m and the buffer registers 22a, 22m are connected to said subscriber terminal 23a, 23m through a separation filter 27a, 27m.
  • this separation filter is not necessary under all circumstances.
  • a control unit is installed, which is through the lines 12a... 12m coupled to the respective switching means 3a... 3m and functions for controlling said switching means.
  • a scanning unit 11 Is installed in the exchange 1 connected through the lines 13a... 13m and the separation filters 14a... 14m to the subscriber outputs 6a... 6m of the exchange 1.
  • the control unit 10 as well as the scanning unit 11 are coupled to a processor 15. Now the operation of this switching system will be described with special reference to the subscriber station 2a. However, it will be clear that the operation is identical for all subscriber stations 2a... 2m.
  • the components 24a.... 24m, 25m, 26m, will for the time being left out of consideration and will be discussed later.
  • selecting signals are generated by operating the selecting means 21a, which selecting signals for instance in the form of a number of digital bits are stored into the buffer register 22a.
  • the scanning unit 11 in the exchange 1 is controlled by the processor 15 such that the scanning unit is transmitting sequentially scanning signals to each of the subscriber stations 2a... 2m.
  • the buffer register 22a is activated to transmit the stored contents.
  • the scanning signals may comprise for instance a number of shift pulses, by means of which the contents is shifted out of the buffer register 22a, but they can also comprise a start pulse for activating a generator coupled to the buffer register 22a to generate a number of shift pulses.
  • the Information transmitted by said buffer register 22a is, whether or not after modulation, transferred via the cable connection 7a to the exchange 1 and is via the subscriber output.6a, the separation filter 14a and the line 13a received by the scanning unit 11.
  • the processor 15 supplies these received signals, eventually after a conversion process to the control unit 10, which generates control signals over the line 12a for controlling the switching means 3a such, that these switching means 3a are transferring the program, which was selected In the subscriber station 2a from the bus line 5a... 5m to the subscriber output 6a. Via the cable connection 7a and the separation filter 27a the selected program signal is received by the television set 20a.
  • the buffer register 22a can be embodied such that during read out operations the information is shifted back to the input so that the information will be contained, but preferably a shift register is used which is during a read out operation of the selecting signals filled with zeros.
  • the buffer register 22a will after reception of the next scanning signal from the scanning unit 11 in the exchange 1 transmit a series of the digital zeros to the scanning unit 11.
  • the reception of a series of digital zeros in the scanning unit 11 forms an indication for the processor 15 that no new selecting signal was stored in the buffer register 22a, so that still the same program signal has to be transmitted to said subscriber output 6a. In that case no further action of the control unit 10 is necessary.
  • the scanning unit 11 transmits sequentially scanning signals via the cable network to each of the subscriber stations and because the buffer registers 22a in said subscriber station are only transmitting their contents to the exchange 1 after reception of a scanning signal, the cable network 7a... 7m as well as the buffer registers 22a... 22m are continuously tested on correct functioning. If an interruption occurs in one of the cable connections 7a... 7m or if one of the buffer registers 22a... 22m shows a defect, then the exchange will not receive a response to the transmitted scanning signal.
  • condition signals may for instance be derived from a fire alarm circuit, a burglar alarm circuit, an alarm circuit for aged people etc.
  • Data signals can be derived for instance from a key board for selecting view data signals, or can be generated as inquiry signals or data signals of other type.
  • the exchange 1 has to contain means for distinguishing between the various signals dependent on the used coding. Furthermore each of the subscriber stations has to contain means for generating the various codes whereby the exact embodiment of this means is of less importance within the scope of the invention. As example in the subscriber station 2m besides the selecting means 21m additional selecting means 24 ⁇ are Illustrated as well as input terminals 25m, 26m connected to the buffer register 22m.
  • the additional selecting means 24m (which are also present in the subscriber station 2a indicated by 24a) may for Instance be used in case the exchange has also view data information available. Said view data information for instance can be supplied in the exchange to a separate bus line and through the selecting means 24m said bus line can be selected. The additional selecting means are thereafter necessary to choose the correct page out of this view data information. Said additional selecting means can be embodied for instance as a key board 24m. The signals generated by said key board are stored in the shift register 22m and are transmitted to the exchange after reception of a scanning signal. The processor 15 will recognize these selecting signals and evaluate these signals such that the correct page from the view data information will be transferred to the subscriber 2m.
  • the key board 21m or 24m in another way. It is for instance possible that during a television broadcast a number of subscriber stations are involved in an inquiry. By generating a predetermined code by means of the key board 24m, which code is recognized by the processor 15 and evaluated in a special way, it is for instance possible that each of said subscriber stations gives an answer to a question asked during a television broadcast. It is for instance possible that the processor 15 after reception of a signal of this type supplies a suitable signal via a separate output 16 to a separate processor 17, in which said signal is further processed.
  • selecting means 21m can be combined with the additional selecting means 24m into one single key board by means of which all the necessary code signals can be generated.
  • a fire alarm circuit for instance through the terminal 25m to the register 22m. If a fire alarm should be raised, then this fire alarm circuit has to generate a predetermined code, which code is stored in the register 22m. After transmission to the exchange 1 the processor 15 will recognize this fire alarm code and will supply for instance via the output 16 a signal to the further processor 17 which in his turn will signal the fire alarm section of the fire brigade or something similar. In a similar way a burglar alarm circuit, an alarm circuit for aged people etc can be connected to the terminals 25m or 26m or to further not illustrated terminals. The alarm codes generated by these circuits can activate the processor 15 to supply a suitable signal via the additional output 16 to the further processor 17.
  • alarm circuits can be coupled to the switching circuit according to the invention, also the gas meter, water meter and electricity meter can be coupled through a suitable coupling circuit to one of these additional terminals 25m, 26m, resulting into the possibility to read periodically the indication of said meters. This can be carried out for instance as follows:
  • Each of said meters comprises a generator circuit generating a coded signal corresponding to the meter reading, which coded signal is stored into the buffer register 22m. After transference to the exchange 1 this coded signal is decoded by the processor 15 and in response thereto the scanning sequence of the scanner 11 is interrupted and a further scanning signal is transmitted to the same subscriber station. In this subscriber station in the meantime the first part of the meter reading is stored into the register 22m and this first part of the meter reading is in response to the next scanning pulse transferred to the processor 15. Thereafter a number of scanning pulses necessary for transferring the whole meter reading are generated and at the end thereof the scanner 11 is controlled by the processor 15 such that the normal sequential scanning is continued. The received meter reading is for instance processed by the further processor 17.
  • the processor 15 comprises a memory, which for instance can contain several data about each subscriber station. Stored therein are for instance data about the programs a subscriber station is allowed to receive or about the fact if In a subscriber station alarm circuits, meter reading circuits etc are connected, or about the fact if the subscriber is allowed to receive beside the normal program signals also view data signals etc. Also this memory can have additional capacity for temporarily storing for instance the received meter readings.
  • the processor 15 Is preferably implemented by means of a microprocessor. In that case the control unit 10 and the scanning unit 11 can be embodied in the form of a suitable coupling circuit controlled by the microprocessor.
  • condition signals generated by the circuits connected to the terminals 25m and 26m and by the additional selecting means should be distinguishable.
  • the exchange in which the available program signals are supplied through a number of signal inputs 4a, 4b... 4n to a number of bus lines 5a, 5b... 5n.
  • one program signal is available on one signal input respectively on one signal bus line.
  • the exchange comprises for each subscriber at least a mixing stage and a controlled oscillator, which oscillator supplies an output signal to the first input of the mixing stage.
  • the frequency multiplex program signals are supplied to the second input of said mixing stage.
  • the oscillator related to the subscriber station concerned is adjusted to such a frequency, that in said mixing station the program signal corresponding to the received selecting signals is transferred to the output frequency band of the mixing stage.
  • this program signal is then, in the same way as it is above described, received by the subscriber concerned.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Systeme de commutation comprenant un central (1) et une pluralite de stations d'abonnes (2) raccordees au central par l'intermediaire d'un reseau de cables (7). Chaque station d'abonne comprend des moyens de selection (21) permettant de generer des signaux de selection d'un programme parmi plusieurs programmes ou des signaux de donnees disponibles dans le central, lesquels signaux de selection sont stockes dans un registre tampon (22) dans chaque station d'abonne. Le central comprend des moyens d'analyse (11) pour transferer sequentiellement des signaux d'analyse a ces registres tampons. Les registres tampons sont actives par ces signaux d'analyse pour transmettre les signaux stockes dans les registres tampons au central. Le central comprend egalement des moyens de commande (10, 15) pour deriver des signaux de commande a partir des signaux de selection recus sortis de ces registres tampons pour commander des moyens de commutation (3) dans le central de sorte que le programme ou les signaux de donnees selectionnes a l'aide des signaux de selection soient transferes depuis le central par l'intermediaire du reseau de cables a l'abonne concerne.
PCT/NL1982/000001 1981-01-19 1982-01-12 Systeme de commutation WO1982002639A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL8100228 1981-01-19
NL8100228 1981-01-19
NL8102743810605 1981-06-05
NL8102743A NL8102743A (nl) 1981-01-19 1981-06-05 Schakelstelsel.

Publications (1)

Publication Number Publication Date
WO1982002639A1 true WO1982002639A1 (fr) 1982-08-05

Family

ID=26645666

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1982/000001 WO1982002639A1 (fr) 1981-01-19 1982-01-12 Systeme de commutation

Country Status (4)

Country Link
EP (1) EP0070284A1 (fr)
IL (1) IL64800A0 (fr)
NL (1) NL8102743A (fr)
WO (1) WO1982002639A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0132465A1 (fr) * 1983-07-21 1985-02-13 The Manitoba Telephone System Système de contrôle de distribution de vidéo
US4538174A (en) * 1982-03-11 1985-08-27 Communications Patents Limited Two-way subscriber TV system with multiple subscriber's sets
US4616256A (en) * 1983-03-23 1986-10-07 Societe Anonyme De Telecommunications Television channel distribution network
EP0389339A1 (fr) * 1989-03-21 1990-09-26 THOMSON multimedia Réseau de distribution interactive d'informations vidéo, audio et télématiques
GB2295755A (en) * 1994-12-03 1996-06-05 Amulet Electronics Ltd Television broadcast distribution system
EP0766474A1 (fr) * 1995-09-28 1997-04-02 AT&T Corp. Circuit de connexion avancée pour des services de communication interactifs

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019287A1 (fr) * 1979-05-18 1980-11-26 Tocom, Inc. Système de communication de données

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019287A1 (fr) * 1979-05-18 1980-11-26 Tocom, Inc. Système de communication de données

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Japan Telecommunications Review, Volume 19, No. 1, issued January 1977 (Tokyo, JP) KEN'ICHI HIRATSUKA et al.: "Highspeed Polling System for Multi-Purpose CATV", pages 20-28, see page 21, left-hand column, line 3 to page 26, right-hand column, line 2; page 27, right-hand column, paragraph 5.4 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4538174A (en) * 1982-03-11 1985-08-27 Communications Patents Limited Two-way subscriber TV system with multiple subscriber's sets
US4616256A (en) * 1983-03-23 1986-10-07 Societe Anonyme De Telecommunications Television channel distribution network
EP0132465A1 (fr) * 1983-07-21 1985-02-13 The Manitoba Telephone System Système de contrôle de distribution de vidéo
EP0389339A1 (fr) * 1989-03-21 1990-09-26 THOMSON multimedia Réseau de distribution interactive d'informations vidéo, audio et télématiques
FR2644961A1 (fr) * 1989-03-21 1990-09-28 Thomson Consumer Electronics Reseau de distribution interactive d'informations video, audio et telematiques
WO1990011664A1 (fr) * 1989-03-21 1990-10-04 Thomson Consumer Electronics S.A. Reseau de distribution interactive d'informations video, audio et telematiques
GB2295755A (en) * 1994-12-03 1996-06-05 Amulet Electronics Ltd Television broadcast distribution system
EP0766474A1 (fr) * 1995-09-28 1997-04-02 AT&T Corp. Circuit de connexion avancée pour des services de communication interactifs

Also Published As

Publication number Publication date
EP0070284A1 (fr) 1983-01-26
IL64800A0 (en) 1982-03-31
NL8102743A (nl) 1982-08-16

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