WO2014168358A1

WO2014168358A1 - Noise blocking device

Info

Publication number: WO2014168358A1
Application number: PCT/KR2014/002607
Authority: WO
Inventors: 류준상; 윤종훈; 손우창
Original assignee: (주)베스타아이앤티
Priority date: 2013-04-09
Filing date: 2014-03-27
Publication date: 2014-10-16
Also published as: KR101358746B1

Abstract

Disclosed is a noise blocking device for blocking upstream noises coming from an individual subscriber terminal. The noise blocking device comprises: a noise blocking control unit for creating a control signal controlling whether to output an upstream RF signal, according to the level of the upstream RF signal which has been inputted by an individual subscriber device; and a switching unit for receiving the control signal and then outputting the inputted upstream RF signal or blocking the output of the inputted upstream RF signal.

Description

Noise blocker

The present invention relates to a CATV system having a noise blocking function.

In more detail, the present invention provides a noise suppressor in a CATV network, such as a tap-off device and a directional coupler of a CATV system, such as noise flowing from a subscriber connected to a tap-off port, noise flowing into a subscriber from a branch port, and an output port. It is to block the noise from the incoming and the noise from the branch port and the output port.

The present invention is also applicable to a tap-off device of a wireless LAN system.

1 illustrates a schematic configuration of a WLAN system to which a conventional wireless tap-off apparatus having a WLAN service function is applied.

In the WLAN system to which the conventional wireless tap-off apparatus is applied as shown in FIG. 1, a WLAN service providing server 10 for providing WLAN services is combined with an IP network 20, and an IP network 20. Is coupled to the CATV network 40 through a headend device (30). In addition, a communication path with a plurality of subscriber stations 50 is formed through the tap-off device 100, which is the last end of the CATV network 40, and the wireless tap-off device 100 is installed at the last end of the CATV network 40. In addition to communicating with the subscriber terminal 50 is configured to perform a wireless LAN service.

Here, since the wireless tap-off device 100 is usually installed on the upper side of the CATV network as the final end of the CATV network 40, the wireless tap-off device 100 does not need to be separately installed in order to secure the wireless LAN service area.

In addition, since the wireless tap-off device 100 is installed at a predetermined distance, the user can use the wireless tap-off device 100 without installing any additional device wherever the CATV network is installed. It is possible to be provided.

However, in the case of a tap-off device of a conventional CATV network, as shown in Figs. 2 and 3, it is configured to directly transmit an RF signal from the branch to the distributor, so that there is no function to block the noise generated on the transmission path. There was a problem that service was difficult.

SUMMARY OF THE INVENTION The present invention has been made to improve the problems associated with conventional CATV systems, and an object of the present invention is to efficiently configure the noise generated in a transmission path by simply configuring a modular noise blocker in a CATV network such as a tap-off and a directional coupler. To provide a CATV system with a noise blocking function that can be blocked by.

Other objects of the present invention will be apparent from the detailed description of the invention described below.

CATV system having a noise blocking function of the present invention for achieving the above object is characterized in that a modular noise blocker is configured between the tap-off device of the tap and the divider.

The noise suppressor of the present invention has a branch port and an output between the tap-off port and the branch port to block noise from the subscriber connected to the tap-off port, to block the noise from the branch port and the noise from the output port. Between the ports, it is characterized in that configured between the branch port and the output port and the RF / AC separator to block the noise flowing from the branch port and the output port, respectively.

The noise blocker of the present invention receives and combines the downlink RF signal separated from the RF / AC separator and the uplink RF signal transmitted from the subscriber port to be transmitted to the directional coupler or splitter, and transmits the uplink RF signal to the HFC network. High and low pass filters; An FWD PAD receiving a downlink signal separated by the first high pass filter and the low pass filter to attenuate a predetermined level; An FWD AMP for amplifying or bypassing a predetermined level attenuated downlink signal in the FWD PAD by a predetermined level; A second high pass filter and a low pass filter for combining a predetermined level amplified downlink signal with an uplink signal and separating the bypassed signal from the uplink RF signal transmitted from the subscriber port into an uplink signal; A REV PAD receiving the uplink RF signal and attenuating a predetermined level; A REV AMP which transmits an uplink RF signal to the first high pass and low pass filters by amplifying or bypassing a predetermined level attenuated uplink signal in a REV PAD by a predetermined level; And a noise blocking controller for controlling to operate the REV AMP or to pass the uplink path only when a certain signal is inputted without passing the REV AMP or the uplink path before the predetermined RF signal is input.

The FWD PAD and the REV PAD of the present invention are configured to be detachable and have a signal attenuation and noise blocking function at the same time.

FWD AMP and REV AMP of the present invention is characterized by having amplification, up and down RF signal control and noise blocking function at the same time.

According to the CATV system having the noise blocking function of the present invention, the noise blocker is manufactured in a modular form, so that the coupling and disconnection can be easily performed on the CATV network such as a tap-off device and a directional coupler, and the maintenance is easy. In addition, there is an economical advantage because only the noise breaker needs to be removed and replaced.

In addition, according to the CATV system having a noise blocking function of the present invention, it is possible to block all the noise from the subscriber, the noise from the branch port to the subscriber, the noise from the output port, and the noise from the branch and output ports, etc. High quality CATV service is possible.

1 is a schematic configuration diagram of a WLAN system to which a conventional wireless tap-off apparatus having a WLAN service function is applied.

2 is a block diagram of a conventional tap-off device.

3 is a structural diagram of a conventional tap-off device.

4 is a block diagram of a tap-off device of the CATV system according to the present invention.

5 is a mechanical exploded perspective view of the tap-off device of the CATV system according to the present invention.

6 is an assembly view of FIG.

Figure 7 is a block diagram of blocking noise flowing from the subscriber connected to the tap-off port of the present invention.

8 is a block diagram of blocking the noise flowing into the plurality of subscribers from the branch port of the present invention.

Figure 9 is a block diagram for blocking the noise flowing from the output port of the present invention.

10 is a block diagram of blocking the noise flowing from the branch port and the output port of the present invention.

11 is a detailed circuit diagram of the noise circuit breaker of the present invention.

12 and 13 are exemplary views in which a pad is configured in the noise suppressor of the present invention.

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

As shown in FIG. 4, the tap-off device of the CATV system configured with the noise blocker of the present invention is coupled to the noise blocker 200 manufactured modularly between the branch 300 and the distribution unit 400.

The noise blocking device of the present invention configured as described above effectively blocks the noise flowing from various directions as described below to enable high quality CATV service.

Since the tap-off device of the present invention is modular, as illustrated in FIGS. 5 and 6, the noise blocker 200 is provided between the branch 300 and the distribution part 400 of the tap-off device by, for example, a fastening means such as a screw. So that they can be easily combined and separated.

FIG. 7 is a diagram illustrating a configuration of blocking noise introduced from a subscriber connected to a tap-off port by inserting a module that blocks noise into a top-bottom plate of a tap-off device or by combining a finished product.

When the RF signal and AC 60 ~ 90V electricity is input from the HFC network, the AC power and the RF signal is separated from the RF / AC separator 101.

The separated AC power is supplied to the power supply (PS) 102 and supplied to the noise circuit breaker 200 as the operating power and bypassed to the RF / AC coupler 103 through the fuse.

Meanwhile, the RF signal separated by the RF / AC separator 101 is branched or distributed, transmitted to the noise blocker 200, and simultaneously transmitted to the RF / AC combiner 103 to be transmitted to the HFC network.

The RF signal separated from the RF / AC separator 101 and transmitted to the noise blocker 200 is separated or combined into a downlink signal and an uplink signal in the first high pass and low pass filter 201, and the downlink signal in FIG. 7. After the signal is separated, it is transmitted to a forward ATT (Forward ATT) designed to have a downlink signal attenuation and noise blocking function, which is suitable for a FWD forward amplifier (203) designed to have a downlink signal control and noise blocking function. The signal transmitted from the FWD PAD 202 is adjusted to transmit the signal.

The FWD AMP 203 amplifies or bypasses the received downlink RF signal.

Thereafter, the second high pass filter and the low pass filter 204 combine the downlink signal with the uplink signal and transmit the 16M band filter 205. The band filter 205 filters only signals of less than 16 MHz, and bypasses all signals above. As a result, the transmitted downlink signal is transmitted to the subscriber port without loss.

The subscriber distribution port is composed of more than 2way ~ 16way and basically one subscriber per port (distributor) is connected.

Each port supplies a downlink signal transmitted from the band pass filter 205 as an RF signal to the subscriber's STB and cable modem.

RF devices such as STBs and cable modems transmit RF signals upward for communication, and the RF signals are supplied to the noise blocker 200 through the subscriber port.

Of the uplink RF signals transmitted from the subscriber port, signals below 16 MHz are removed by the band filter 205 and only signals of 16 MHz or more are bypassed. Up to this point, the up and down signals coexist together.

After the second high and low filter 204 is separated into an up-down signal again, the uplink RF signal is transmitted to the REV PAD (Reverse ATT, reverse attenuator) 206 designed to have a function of up-signal attenuation and noise-blocking, so that the uplink signal The input signal is adjusted so that a proper signal is inputted to the REV AMP (reverse amplifier) 207, which is designed to have an adjustment and noise blocking function, and is also transmitted to the noise blocking controller 208.

The noise cut-off controller 208 does not pass the REV AMP 207 or the uplink path before the predetermined RF signal is input, and operates the REV AMP 207 or passes the uplink path only when a certain signal is inputted abnormally.

In general, the noise is lower than the signal of the STB and the cable modem, and is not passed. If a certain signal is inputted, the noise is generated when the RF device such as the STB and the cable modem is used.

The noise blocking controller 208 transmits a control signal to the REV AMP 207 to operate the REV AMP 207 or to operate the RF switch to pass the uplink RF signal when the predetermined signal is input. .

The REV AMP 207 receives the control signal of the noise cutoff controller 208 and amplifies or bypasses the uplink signal and transmits an uplink RF signal to the first high pass filter and the low pass filter 201.

Accordingly, the first high pass filter and the low pass filter 201 combine the transmitted downlink RF signal with the uplink RF signal and transmit the same to a directional coupler (DC) or a splitter (SP).

The uplink RF signal transmitted from the first high pass and low pass filter 201 is transmitted to the HFC network.

FIG. 8 is a diagram illustrating a configuration of blocking noise introduced into a plurality of subscribers in a distributed or branched network portion by inserting and coupling a module that blocks noise to a directional coupler and a splitter. In the related art, a directional coupler and a splitter simply divide a signal. Although only one structure was performed, FIG. 8 is a configuration for blocking noise introduced from a branch port. The same configuration as that in Fig. 7 is denoted by the same reference numerals, and reference numerals are omitted in the drawings.

As shown in FIG. 8, when RF signal and AC 60 to 90V electricity are input from the HFC network, the AC power and the RF signal are separated from the RF / AC separator 101, and the separated AC power is PS (Power supply). And supplied to the noise blocker 200 as operating power and bypassed to the RF / AC coupler 103 through a fuse, and also to the RF / AC coupler 105. The RF / AC The RF signal separated by the separator 101 is branched or distributed, transmitted to the noise blocker 200, and transmitted to the RF / AC combiner 103 to be transmitted to the HFC network, and transmitted from an RF device such as an STB and a cable modem. The uplink RF signal is supplied to the noise blocker 200 through the branch port, and then operates in the same manner as in FIG. 7. Meanwhile, the RF signal transmitted from the noise blocker 200 is separated and output from the RF / AC separator 209.

FIG. 9 is a diagram illustrating a configuration of blocking noise introduced into a plurality of subscribers in a part of a network that is distributed or branched by inserting and coupling a module that blocks noise to a directional coupler and a splitter, and a conventional directional coupler and a splitter are simply a signal distribution. Although only one structure was performed, FIG. 9 is a configuration for blocking noise introduced from an output port.

FIG. 10 is a diagram illustrating a configuration of blocking noise coming from a plurality of subscribers in a distributed or branched network part by inserting a module that blocks noise into a directional coupler and a splitter, and the conventional directional coupler and the splitter merely provide a signal distribution. Although it was designed to perform, Figure 10 is a configuration for blocking the noise flowing from the branch port and the output port.

Fig. 11 is a detailed circuit diagram of the noise circuit breaker of the present invention, in which the numerals in the arrows indicate the operation sequence.

While the conventional noise blocker is configured to turn on and off only a signal path to an RF switch, the present invention is to block noise by turning on and off a power supply of an amplifier without configuring an expensive RF switch. In order to forcibly turn on / off RF switch or amplifier of noise breaker remotely, it is configured to bypass in case of power failure.

When the input RF signal is branched, the output of the branch is transmitted to the input of the amplifier, and the branch port transmits the RF signal to the sensing circuit.

When the RF signal of the branched port is amplified and a predetermined signal or more is input, a bias voltage or current is supplied to the transistor. When the voltage or current is biased, a relay is operated to operate an RF amplifier or an RF switch.

The relay or Revese AMP repeats on and off with the signal supplied from the transistor.

The modem module can forcibly turn on or off relay 4 or AMP as a signal from a specific downlink signal, and transmit status information as an uplink signal when necessary.

The bypass relay maintains the off state at all times when the power is input, and when the power is off, the bypass relay is turned on so that the input up and down signals can be bypassed.

12 and 13, the attenuator of the noise circuit breaker 200 of the present invention is configured to be detachable. As shown in the figure, it is composed of a series-parallel circuit to enable signal attenuation.

As mentioned above, although this invention was demonstrated in detail with reference to attached drawing, this is only an illustration, It is clear that various deformation | transformation and a change are possible within the scope of the technical idea of this invention. Therefore, the protection scope of the present invention should not be limited to the above-described embodiment, but should be determined including the scope according to the description of the following claims and their equivalents.

Claims

In the noise blocker to block the upstream noise coming from the individual subscriber end,

A noise blocking controller for generating a control signal for controlling whether the uplink RF signal is output according to a level of the uplink RF signal input from an individual subscriber device; And

And a switching unit configured to receive the control signal and output the input uplink RF signal or block the output.
The method of claim 1,

The noise blocking control unit,

When the level of the input uplink RF signal is a level recognized as an uplink RF signal of the subscriber device, generating a first control signal for controlling to output the uplink RF signal,

And a second control signal for controlling to block an output of the uplink RF signal when the level of the input uplink RF signal is not recognized as an uplink RF signal of the subscriber device.
The method of claim 2,

Signal not recognized as an uplink RF signal of the subscriber device,

Noise canceller, characterized in that the upstream noise signal introduced from the subscriber end.
The method of claim 2,

The switching unit,

Noise suppression device, characterized in that the RF amplifier (Amp) or RF switch (SWITCH).
The method of claim 2,

The switching unit,

When the first control signal is input, passing through the uplink RF signal and outputs,

When the second control signal is input, the noise blocking device, characterized in that all signals are blocked so as not to pass the uplink RF signal.
The method of claim 1,

The noise blocking device,

Noise canceling device, characterized in that applicable to the tap off device of a CATV (Cable Television) system or a wireless LAN system.
The method of claim 6,

The noise blocking device,

And is modularly configured to be detachable between the tap-off device's tap-off and divider.
The method of claim 1,

The noise blocking device,

And is arranged between the tap off port and the branch port to block noise from the subscriber end connected to the tap off port.
The method of claim 1,

The noise blocking device,

Noise isolation device, characterized in that configured between the branch port and the output port to block noise coming from the branch port to the subscriber and noise coming from the output port.
The method of claim 1,

The noise blocking device,

Noise isolation device, characterized in that configured between the branch port and the output port and the RF / AC separator to block the noise coming from the branch port and the output port.
The method of claim 1,

The noise blocking device,

RF / AC separator 101 for separating the RF signal and the AC power input from the network;

A PS 102 receiving the separated AC power to supply the operating power of the noise blocking device;

An RF / AC combiner 103 for receiving the RF signal separated by the RF / AC separator and transmitting the received RF signal to a network;

A high pass and low pass filter 201 for combining the downlink RF signal separated by the RF / AC separator and the uplink RF signal transmitted from the subscriber port and transmitting the combined uplink RF signal to a branch, and transmitting the uplink RF signal to a network;

An FWD PAD 202 for receiving a downlink RF signal separated by the high pass and low pass filters and attenuating a predetermined level;

A FWD AMP 203 for amplifying or bypassing a predetermined level attenuated downlink RF signal in the FWD PAD by a predetermined level;

A high pass and low pass filter 204 for combining the predetermined level amplified downlink RF signal and the uplink RF signal and separating the bypassed signal from the uplink RF signal transmitted from the subscriber port into an uplink downlink RF signal;

Only the signals below the predetermined frequency are filtered out of the combined signal of the downlink RF signal and the uplink RF signal transmitted from the high pass and low pass filters, and all of the above pass signals are transmitted to the subscriber port without loss. A band filter 205 which removes a signal below a predetermined frequency from an uplink RF signal transmitted from the subscriber port and bypasses more RF signals;

A REV PAD 206 receiving the uplink RF signal and attenuating a predetermined level;

And a switching unit (207) for transmitting the uplink RF signal to a high pass filter and a low pass filter by amplifying or bypassing a predetermined level attenuated uplink RF signal in the REV PAD.
The method of claim 1,

The noise blocking device,

RF / AC separator 101 for separating the RF signal and the AC power input from the network;

A PS 102 for receiving the separated AC power and supplying the separated AC power to the operating power of the noise breaker;

An RF / AC combiner 103 for receiving the RF signal separated by the RF / AC separator and transmitting the received RF signal to a network;

A high pass filter and a low pass filter 201 for combining the downlink RF signal separated from the RF / AC separator and the uplink RF signal transmitted from the branch port and transmitting the combined uplink RF signal to the branch unit;

An FWD PAD 202 for receiving a downlink RF signal separated by the high pass and low pass filters and attenuating a predetermined level;

An FWD AMP 203 for amplifying or bypassing a predetermined level attenuated downlink RF signal in the FWD PAD by a predetermined level;

A high pass and low pass filter 204 for combining the predetermined level amplified downlink RF signal and the uplink RF signal, and separating the bypassed signal among the uplink RF signals transmitted from the branch port and the output port into an uplink downlink RF signal;

A REV PAD 206 receiving the uplink RF signal and attenuating a predetermined level;

And a switching unit (207) for transmitting the uplink RF signal to a high pass filter and a low pass filter by amplifying or bypassing a predetermined level attenuated uplink RF signal in the REV PAD.
The method of claim 1,

The noise blocking device,

A high pass and low pass filter 201 for combining the downlink RF signal separated from the RF / AC separator and the uplink RF signal transmitted from the output port and transmitting the combined uplink RF signal to the branch unit;

An FWD PAD 202 for receiving a downlink RF signal separated by the high pass and low pass filters and attenuating a predetermined level;

A FWD AMP 203 for amplifying or bypassing a predetermined level attenuated downlink RF signal in the FWD PAD by a predetermined level;

A high pass and low pass filter 204 for combining the predetermined level amplified downlink RF signal and the uplink RF signal and separating the bypassed signal among the uplink RF signals transmitted from the branch port and the output port into an uplink downlink RF signal;

A REV PAD 206 receiving the uplink RF signal and attenuating a predetermined level;

And a switching unit 207 for transmitting an uplink RF signal to a high pass filter and a low pass filter 201 by amplifying or bypassing a predetermined level attenuated uplink RF signal in the REV PAD. .