DE3102821A1 - Multiple distributor for cable television systems - Google Patents

Abstract

The invention relates to a multiple distributor for cable television systems with star-shaped peripheral sections. The arrangement contains a first chain (I) of directional couplers (6-9), via the output loops of which the radio and television signals of a lower frequency band are conducted to connecting sockets (24). According to the invention, a corresponding second chain (II) is provided via the coupling loops of which television signals of an upper frequency band, for which an additional fee must be paid, are conducted to the same connecting sockets (24). To each subscriber, one directional coupler (8; 20) from each chain (I, II) can then be allocated in each case. The output loops are either connected in series or connected to one another via matching circuits. The first variant requires filter circuits (3, 5, 15, 17) at the inputs of both chains (I, II). <IMAGE>

Description

Multiple distributors for cable television systems

The invention relates to a multiple distributor for cable television systems with star-shaped network extensions, in which a first one, with its wave impedance closed chain consisting of directional couplers and line pieces Transmission of radio and / or television signals is used for which the subscriber has a Grursigebühr has to pay, and in which the directional coupler decoupling loops are closed with their wave resistance on one side and on the other Side have a connection.

Such a multiple distributor is known from DE-Gm 79 OS 540 and contained in the older proposal (P 30 45 800.5).

In the case of cable television systems, programs can be offered that Payment of a basic fee or which are received when an additional fee is paid can. The latter can be encrypted in the program center, 30 only that reception is possible for those subscribers who purchase a decryption device or rent. The reception of programs requiring an additional fee can also be can be registered and calculated via a return channel.

The object of the invention is to provide participants who are involved in receiving programs who require an additional fee to provide all programs, without the need for encryption and decryption.

Starting from a multiple distributor of the one described in the introduction This object is achieved according to the invention once in that the first chain a first low-pass filter upstream and a first high-pass filter with a terminating resistor on the input side is connected in parallel that a second, completed with its characteristic impedance and a chain consisting of directional couplers and line sections for the transmission of Television signals, for which the subscriber has to pay an additional fee, provided is that the directional coupler decoupling loops of the second chain on both sides connections have that a second high-pass filter upstream and downstream of the second chain on the input side a second low-pass filter is connected in parallel with a terminating resistor and that for participants in programs for which an additional fee is payable, a directional coupler output coupling loop of each chain connected in series and are connected to a subscriber connection socket.

A second solution is characterized in that a second, with Their characteristic impedance and made up of directional couplers and line pieces existing chain for the transmission of television signals for which the subscriber has a Has to pay additional fee, it is provided that the directional coupler decoupling loops the second chain terminated on one side with its wave resistance are and have a connection on their other side and that with the participants of programs for which an additional fee has to be paid, j One directional decoupling loop each each chain via its connection and a matching circuit with the common Subscriber connection socket are connected.

The first solution is beneficial when redesigning both chains will. The second solution is advantageous if there are conventional chains (Multitaps) should be used. The matching circuits at The second solution is to allow the subscriber only one connection socket and does not have to re-plug between two loop outputs.

It is advantageous if the directional coupler and the line pieces as a printed circuit bnd the switching elements at least partially as a layer circuit are trained.

The directional couplers can also be used with transformers in an advantageous manner will be realized.

It is also advantageous if a remote-controlled connection and disconnection the directional coupler decoupling loop of the second chain at the individual subscriber is provided.

Finally, it is an advantage if a housing is available for either the entire multiple distributors or each for a chain with its associated switching elements is provided.

The invention will be described in greater detail below on the basis of exemplary embodiments explained.

Fig. 1 shows a first solution of the multiple distributor according to the invention and FIG. 2 shows a second solution of the multiple distributor according to the invention.

Fig. 1 shows a multiple distributor according to the invention with a chain I and a chain II. The chain I contains directional couplers 6 to 9, their coupling loops respectively are completed with a characteristic impedance 12.

The through line of the chain I contains a line section 10 and is completed with its wave resistance 11. The input of the chain I is a Upstream low-pass filter 3 and a high-pass filter 5 with its terminating resistor 4 connected in parallel. A voltage source is connected to the input of the low-pass filter 3 1 with internal resistance 2, which emits the radio and / or television signals that the Participants can receive upon payment of a basic fee.

The chain II contains directional couplers 18 to 21. The through conductor the chain II contains a line section 22 in addition to the directional couplers 18 to 21 and is terminated with its characteristic impedance 23. The entrance of chain II is a high-pass filter 15 upstream and a low-pass filter 17 with its terminating resistor 16 connected in parallel. At the input of the high-pass filter 15 is a voltage source 13 connected with internal resistance 14, which emits television signals that are only available when Payment of an additional fee can be received.

Each participant is a directional coupler of chain I and usually also a directional coupler assigned to chain II. He only pays the basic fee and if the directional coupler 6 is assigned to it, then its output socket is with connected to the output of the output loop of the directional coupler 6 of the chain I. He pays both the basic fee and the additional fee and is the directional coupler 8 assigned to chain I and 20 to chain II; then its connection socket is 24 ' via the decoupling loop of the directional coupler 20 to the connection of the decoupling loop of the directional coupler 8 connected.

From the voltage source 1, radio and television signals arrive in the frequency range from 47 to 230 NHz on chain I and via the decoupling loops of the directional coupler 6 to 9 to the output sockets 24. From the voltage source 13 come additional charges Television signals in the frequency range from 470 to 860 NHz via the high-pass filter 15 the chain II and the decoupling loops of the directional couplers 18 to 21. On the Connection socket 24 'receives all signals. The high-pass filter 5 causes signals the voltage source in the frequency range 470 to 860 MHz after passage bs-; the directional coupler chains find in the resistor 4 wave resistance-appropriate termination; the TieSpaßfilt; 17th causes signals from voltage source 1 in the frequency range 47-230 Hz after passage both directional coupler chains in resistor 16 terminating in accordance with the wave resistance Find.

In the embodiment according to FIG. 2, the coupling-out loops the directional coupler 18 to 21 in contrast to the exemplary embodiment according to FIG. 1 terminated with their wave impedance12 '. Deviating from the arrangement according to Fig. 1 is the output of the decoupling loop of the directional coupler 8 via a low-pass filter 25 and the output of the output loop of the directional coupler 20 via a high-pass filter 26 connected to the output socket 24 '. The filter circuits 25 and 26 effect the adaptation and mutual decoupling of the subscriber connections. Filter circuits at the entrances of the chains are then no longer required.

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Claims (8)

Claims 1. Multiple distributors he cable television systems with star-shaped Network outlets, in which a first, terminated with its characteristic impedance and chain of transmission of radio signals consisting of directional couplers and line sections and / or television signals, for which the subscriber has to pay a basic fee has, and in which the directional coupler decoupling loops on one side with their wave impedance are completed and on their other side a connection have, characterized in that the first chain (I) on the input side a first Low-pass filter (3) upstream and a first high-pass filter (5) with terminating resistor (4) is connected in parallel that a second, completed with its characteristic impedance (23) and chain consisting of directional couplers (18 to 21) and line pieces (22) (II) for the transmission of television signals, for which the subscriber pays an additional fee has to pay, it is provided that the directional coupler decoupling loops second chain II) have connections on both sides that the second chain (II) on the input side a second high-pass filter (15) and a second low-pass filter (17) with one Terminating resistor (16) is connected in parallel and that for participants in programs, for which an additional fee has to be paid, a directional coupler decoupling loop each chain (I, II) connected in series and with a subscriber connection socket (24) are connected. 2. Multiple distributors for cable television systems with star-shaped network extensions, in which a first, closed with its characteristic impedance and made up of directional couplers and line sections existing chain for the transmission of radio and / or television signals for which the participant has to pay a basic fee, and for which the Directional coupler decoupling loops on one side with their characteristic impedance are closed and have a connection on their other side, characterized that a second, with its characteristic impedance (23) closed and made up of directional couplers (18 bf 21) and line pieces (22) existing chain (II ') for the transmission of television signals, for which the participant has to pay an additional fee, it is provided that the directional coupler coupling loops of the second chain (II ') on one side are completed with their wave impedance and a connection on their other side have and that the participants in the fee-based programs each have one Directional coupler decoupling loop of each chain (I, II ') via its connection and an adaptation circuit (25, 26) with the common subscriber connection socket (24) are connected. 3. Multiple distributor according to claim 1 or 2, d a -d u r c h g e k It is noted that the directional couplers (6-9, 18-21) and the line pieces (10, 22) are designed as a printed circuit. 4. Multiple distributor according to claim 3, d a d u r c h g e k e n n z E i c h n e t that the switching elements at least partially as a layer circuit are trained. 5. Multiple distributor according to claim 1 or 2, d a -d u r c h g e k It is noted that the directional couplers (6-9, 18-21) are implemented with transformers are. 6. Multiple distributor according to one of the preceding claims, d a it is indicated that remote-controlled switching on and off the directional coupler decoupling loop of the second chain (11, 11 ') at the individual Participant is provided. 7. Multiple distributor according to one of the preceding claims, d a d u r c h g e k e n n n z e i c h -n e t that a housing is provided for it. 8. Multiple distributor according to one of claims 1 to 6, d a du r c it is noted that every chain (1, II, II) with its associated Switching elements is arranged in a separate housing.