TW201415734A - Indoor splitter of cable TV system - Google Patents

Abstract

An indoor splitter of a cable TV system is disclosed. The indoor splitter receives the carrier wave signal outputted from the outdoor distributer and transmits the cable TV signal in the carrier wave signal via an interruption detector to the TVs at user ends for viewing. The indoor splitter comprises a voltage detection unit capable of detecting whether the TV cable to the TVs at user ends has been cut off or pirate picked; if cut off or pirate pick has been detected, the voltage detection unit will generate a detection signal and transmitt to a system control end, thereby realizing the monitoring function and stopping the transmission of cable TV signal to the TVs at user ends.

Description

Indoor cable splitter

An indoor splitter, especially an indoor splitter used in a cable television system, wherein the indoor splitter has a function of detecting a disconnection.

The Community Antenna Television Service (CATV) is a network system that uses coaxial cable to receive or transmit television signals. The cable TV network system is a one-to-many long-distance transmission method (system-to-user). In addition to transmitting signals by coaxial cable, it is necessary to use an amplifier (Amplifier), a splitter (Multi Tap), and a power plug-in (Power). Devices such as Inserter) transmit the transmission signal to the remote client.

At present, the cable television network system is connected to the client television through a coaxial cable. In addition to transmitting a radio frequency (RF), the coaxial cable is added to the power inserter at a suitable distance to load the power signal. Provide power to operate each device.

In the case of a splitter, the splitter has the function of dividing the transmitted signal into multiple paths. Referring to the first figure, a circuit block diagram of a prior art splitter, wherein the main signal includes a power signal (AC90V 10A) carrying an RF signal (RF). The splitter is mainly composed of a distributor 41 (SpIitter), a high frequency transformer 42 (Coupler), a main signal input port 43, and a main signal output port 44.

The distributor 41 has a first output port 411 and a second output port 412. The main signal is input from the main signal input 埠43 into the barrier via the capacitor 45. The capacitor 45 filters the power (low frequency) signal of the main signal to make the RF (high frequency) signal and the power signal divergence.

The RF signal is transmitted to the distributor 41 via the high frequency transformer 42 and then outputted from the first output port 411 and the second output port 412, and the RF signal is transmitted back to the high frequency transformer 42 and then the power signal is recombined into the main signal. It is output by the main signal output 埠44 and transmitted to the next place. An inductive coil 47 for passing a power signal is disposed between the two capacitors 45 and 46.

However, the shortcoming of the cable television system is that it is impossible to detect whether the cable of the user terminal is cut or stolen. From the circuit block of the first figure, when the main signal is output 44, the first output 埠When the cable 411 of the 411 or the second output port 412 to the user television is cut off, the system control terminal cannot detect that the cable television cable has become a disconnected state, and thus cannot perform any anti-theft function, such as stopping the transmission immediately. Signal. In the process of disconnection, because the cable TV cable system is still transmitting signals, as long as the cable TV cable is cut back, it can continue to watch cable TV, which is not only bad for the operator's operation, but also for the paid viewers. It is even more unfair.

Therefore, it is necessary to provide an indoor diver that can detect whether the cable television cable has been cut or stolen to solve the above-mentioned lack of conventional technology.

The main object of the present invention is to provide an indoor splitter for a cable television system, wherein the indoor splitter receives the mixed signal output by the outdoor distributor, and transmits the cable signal in the mixed signal to the user television through the disconnection detector. For users to watch.

The indoor splitter includes a voltage detecting unit, and the voltage detecting unit is configured to detect a cable television connection state between the cable and the user terminal television. When the voltage detecting unit and the user terminal TV are connected with the disconnection detector, the transistor in the voltage detecting unit enters a conducting state, and the indoor diver can continuously receive the system control. The mixed signal transmitted through the outdoor distributor, and further transmits the cable signal in the mixed signal to the user television.

Conversely, if the voltage detection unit and the disconnection detector of the user television are removed, the transistor in the voltage detection unit will enter an off state, and the voltage detection unit will generate a detection signal to the system control end. When the system control terminal receives the detection signal, it immediately stops the outdoor distributor from transmitting the cable signal to the indoor splitter that sends the detection signal.

Therefore, the present invention can detect whether the cable television cable is cut or stolen, thereby implementing the monitoring function, and stopping the transmission of the cable television signal to the indoor splitter that is detected to be disconnected.

The embodiments of the present invention will be described in more detail below with reference to the drawings and the <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt;

Referring to the second figure, a schematic diagram of the actual connection of the indoor splitter of the cable television system of the present invention, referring to the third figure, is a circuit block diagram of the indoor splitter of the cable television system of the present invention. As shown in the second figure, the indoor splitter 1 of the cable television system of the present invention has a signal input terminal 1a and two signal output terminals 1b, 1c, and the signal input terminal 1a is connected to the output end of the outdoor distributor 3, and The two signal output terminals 1b, 1c are connected to the client televisions 7, 7' via the hacking detectors 5, 5', respectively. The outdoor distributor 3 receives the mixed signal S from the system control terminal.

As shown in the third figure, the indoor splitter 1 of the cable television system of the present invention includes a signal separating unit 10, a signal distributing unit 20, a voltage detecting unit 30, a first signal mixing output unit 40, and a second signal mixing output unit 50. .

The indoor splitter 1 of the cable television system of the present invention is configured to receive the mixed signal S output from the outdoor distributor 3, and appropriately process the mixed signal S to capture the cable signal in the mixed signal S and Further allocated to more than two client TVs 7, 7 ' .

Referring to the third and fourth figures, the signal separation unit 10 of the present invention receives the mixed signal S output from the output of the outdoor distributor 3, and separates the mixed signal S to extract the cable television contained therein. Signal S1 and voltage signal (theft detection signal) S2 are transmitted separately.

The signal distribution unit 20 receives the cable signal S1 and further divides the received cable signal S1 into a first cable signal S11 and a second cable signal S12, and transmits them separately.

The voltage detecting unit 30 receives the voltage signal S2, and detects whether there is a connection between the two user televisions 7, 7' to connect the two disconnect detectors 5, 5', and in one of the disconnected detectors 5 or When 5' is removed, a detection signal is generated and transmitted to the system control end (not shown), so that the outdoor distributor 3 stops outputting the mixed signal S, and if the disconnection detector 5, 5' is not When removed, the voltage signal S2 is further divided into a first voltage signal S21 and a second voltage signal S22 and transmitted separately.

The first signal mixed output unit 40 receives the first cable signal S11 and the first voltage signal S21, and performs signal mixing processing on the first cable signal S11 and the first voltage signal S21, thereby generating a mixed first cable signal S11. The first mixed signal S' of the first voltage signal S21 is transmitted to the user television 7 via the disconnection detector 5 for the user to view the user television 7.

The second signal mixed output unit 50 receives the second cable signal S12 and the second voltage signal S22, and performs signal mixing processing on the second cable signal S12 and the second voltage signal S22, thereby generating a mixed second cable signal S12. And the second mixed signal S " of the second voltage signal S22, and the second mixed signal S " is transmitted to the other user television 7' via another disconnected detector 5' for the user to watch the user television 7 '.

The fourth embodiment is an exemplary circuit diagram of the various elements of the present invention. It is to be noted that the fourth embodiment is intended to illustrate an exemplary embodiment of the present invention and is not intended to limit the scope of the present invention. Other circuit designs.

Referring to the fourth figure, the signal separation unit 10 of the present invention includes a capacitor and an inductor for filtering low frequency voltage signals and high frequency cable signals. The signal distribution unit 20 includes a plurality of resistors and a high frequency transformer. The voltage detecting unit 30 includes a plurality of resistors and transistors. The first signal mixing unit 40 includes a capacitor and an inductor. The second signal mixing unit 50 also includes a capacitor and an inductor.

Wherein, when the signal input end 1a of the indoor splitter 1 is connected to the outdoor distributor 3, and the signal output end 1b, 1c of the indoor splitter 1 and the user end television 7, 7 ' are connected with the disconnection detector 5 At 5 ' , since the voltage detecting elements 5, 5 ' and the outdoor distributor 3 are provided with voltage dividing elements such as resistors, the voltage detecting unit 30 can be made by selecting an appropriate value of the resistor and using the voltage dividing principle. The transistor Q1 enters a conducting state, at which time the indoor splitter 1 does not generate a detection signal, so the indoor splitter 1 can continuously receive the mixed signal S transmitted from the system control terminal via the outdoor distributor 3.

And transmitting the first voltage signal S21 and the second voltage signal S22 to the first signal mixing output unit 40 and the second signal mixing output unit 50 respectively, so that the first voltage signal S21 and the second voltage signal S22 are connected to the first cable. The television signal S11 and the second cable signal S12 are mixed into the first mixed signal S ' and the second mixed signal S " , and transmitted to the user televisions 7, 7 ' to provide user viewing.

If the disconnection detector 5, 5 ' is removed, the transistor Q1 of the voltage detecting unit 30 will enter an off state, at which time the voltage detecting unit 30 will generate a detection signal and return it to the system control terminal. When the control terminal receives the detection signal, it immediately stops the outdoor distributor 3 from transmitting the mixed signal S to the indoor splitter 1 that sends out the detection signal, so that the user cannot watch the cable television.

The above is only a preferred embodiment for explaining the present invention, and is not intended to limit the present invention in any way, and any modifications or alterations to the present invention made in the spirit of the same invention. All should still be included in the scope of the intention of the present invention.

1‧‧‧ indoor splitter for cable television systems

10‧‧‧Signal separation unit

20‧‧‧ Cable signal divergence unit

30‧‧‧Voltage detection unit

40‧‧‧First signal mixed output unit

50‧‧‧Second signal mixed output unit

41‧‧‧Distributor

42‧‧‧High frequency transformer

43‧‧‧Main signal input埠

44‧‧‧Main signal output埠

45, 46‧‧‧ capacitor

47‧‧‧Inductance coil

411‧‧‧First output埠

412‧‧‧Second output埠

1a‧‧‧Signal input

1b, 1c‧‧‧ signal output

3‧‧‧Outdoor distributor

5, 5'‧‧‧ pirate detector

7, 7'‧‧‧Customer TV

S‧‧‧ mixed signal

S1‧‧‧ cable TV signal

S2‧‧‧ voltage signal

S11‧‧‧First cable TV signal

S12‧‧‧Second cable television signal

S21‧‧‧First voltage signal

S22‧‧‧First voltage signal

S'‧‧‧ first mixed signal

S′′‧‧‧Second mixed signal

The first figure is a circuit block diagram of a differentiator of the prior art.

The second figure is a schematic diagram of the actual connection of the indoor splitter of the cable television system of the present invention.

The third figure is a circuit block diagram of the indoor splitter of the cable television system of the present invention.

The fourth figure is an exemplary circuit diagram of the various units of the present invention.

1‧‧‧ indoor divider

1a‧‧‧Signal input

1b, 1c‧‧‧ signal output

3‧‧‧Outdoor distributor

5, 5'‧‧‧ pirate detector

7, 7'‧‧‧Customer TV

Claims (6)

An indoor splitter of a cable television system has a signal input end and two signal output ends, the signal input end being connected to an output end of an outdoor distributor, the outdoor distributor receiving a one from a system control end Mixing the signal and outputting the mixed signal, and the two signal outputs are connected to the two-user television through two stealing detectors, wherein the indoor splitter of the cable television system comprises: a signal separating unit, receiving the output from the output Outputting the mixed signal, and separating the mixed signal to extract a cable signal and a voltage signal contained therein, and transmitting the signal separately; a signal distribution unit receiving the cable signal and The received cable television signal is further divided into a first cable television signal and a second cable television signal and transmitted separately; a voltage detecting unit receives the voltage signal and detects the television to the two user terminals. Whether there is a connection between the two disconnection detectors, and when one of the disconnection detectors is removed, a detection signal is generated. Transmitting to the control end of the system, so that the outdoor distributor stops outputting the mixed signal, and if the disconnection detector is not removed, the voltage signal is further divided into a first voltage signal and a second voltage The signal is transmitted separately; a first signal mixed output unit receives the first cable signal and the first voltage signal, and performs signal mixing processing on the first cable signal and the first voltage signal, thereby generating a first mixed signal of the first cable signal and the first voltage signal is mixed, and the first mixed signal is transmitted to the user television through the disconnection detector; and a second signal mixed output unit Receiving the second cable signal and the second voltage signal, and performing signal mixing processing on the second cable signal and the second voltage signal, thereby generating a mixture of the second cable signal and the second voltage A second mixed signal of the signal, and the second mixed signal is transmitted to the other client television via another disconnect detector. The indoor splitter of the cable television system according to claim 1, wherein the signal separating unit comprises a capacitor and an inductor. The indoor splitter of the cable television system according to claim 1, wherein the signal distributing unit comprises a plurality of resistors and a high frequency transformer. The indoor splitter of the cable television system according to claim 1, wherein the voltage detecting unit comprises a transistor and a plurality of resistors. The indoor splitter of the cable television system according to claim 1, wherein the first signal mixing unit comprises a capacitor and an inductor. The indoor splitter of the cable television system according to claim 1, wherein the second signal mixing unit further includes a capacitor and an inductor.