KR200419434Y1 - T-DMB receiver by using coaxial distribution of TV network - Google Patents

Abstract

The present invention relates to a receiver for terrestrial digital multimedia broadcasting, and more specifically, to terrestrial digital multimedia broadcasting (T-DMB) by branching a signal received from a TV coaxial distribution network of a large aggregated building such as an apartment complex, a shopping mall, and a building. The present invention relates to a terrestrial digital multimedia broadcasting receiver capable of receiving terrestrial digital multimedia broadcasting by filtering and amplifying only signals and outputting them in a wired or wireless manner.

To this end, a terrestrial digital multimedia broadcasting receiver using a public hearing network according to the present invention includes a connection terminal connected to a public hearing terminal inside a building, a first distributor for distributing a signal received through the connection terminal in two paths, and A first impedance converter which receives a signal distributed from one terminal of the first distributor and converts an impedance, a first amplifier which receives the signal from the first impedance converter and amplifies the signal with a predetermined gain, and branches the output signal of the first amplifier First and second filters for filtering low and high bands of terrestrial digital multimedia broadcasting, a second amplifier for synthesizing and outputting the outputs of the first and second filters with a predetermined gain, and from the second amplifier. A transmit antenna for outputting the output T-DMB signal to a small shadow area inside the building, and the other end of the first distributor And the transmission line for transmitting the signals from the distribution, the TV signal received from said transmission line comprises a power supply section for supplying power to the TV signal output terminal and the first and second amplifier outputs.

The terrestrial digital multimedia broadcasting receiver using the public hearing network according to the present invention as described above divides the signal received from the TV coaxial distribution network of a large-scale assembly building and filters and amplifies only the terrestrial digital multimedia broadcasting (T-DMB) signal to wire or wirelessly. In this way, it is possible to receive high quality terrestrial digital multimedia broadcasting even in a small shaded area inside the building.

Description

Terrestrial digital multimedia broadcasting receiver using public hearing network {T-DMB receiver by using coaxial distribution of TV network}

1A is a conceptual diagram of a terrestrial digital multimedia broadcasting service.

1B illustrates a conventional public hearing network configuration.

1C is a diagram illustrating the flow of a TV signal in FIG. 1B.

2 is a diagram illustrating a connection of a terrestrial digital multimedia broadcasting receiver using a public hearing network according to the present invention;

Figure 3 is a block diagram showing the configuration of a terrestrial digital multimedia broadcasting receiver using a public hearing network according to the present invention.

4 is a block diagram illustrating another embodiment of FIG. 3.

5 is an external view of a terrestrial digital multimedia broadcasting receiver using a public hearing network according to the present invention;

<Description of Symbols for Major Parts of Drawings>

101: Broadcasting Center 102: Transmission Center

103: transmitting station 104: relay station

105: receiving terminal 111: satellite antenna

112: TV antenna 113: Headend

114: aggregated building 115a to 115d: first to fourth amplifiers

116a-116c: branch means 117a-117c: public hearing terminal

118a, 118b: TV receiver 200: T-DMB receiver

201: connecting terminals 202 and 212: first and second distributors

203: first impedance converter 204, 207: first and second amplifier

205 and 206: first and second filters 208 transmission antennas

209: transmission line 210: TV signal output terminal

211: power supply unit 213: second impedance converter

214: T-DMB signal output terminal

The present invention relates to a receiver for terrestrial digital multimedia broadcasting, and more specifically, to terrestrial digital multimedia broadcasting (T-DMB) by branching a signal received from a TV coaxial distribution network of a large aggregated building such as an apartment complex, a shopping mall, and a building. Terrestrial Digital Multimedia Broadcasting) The present invention relates to a terrestrial digital multimedia broadcasting receiver capable of receiving terrestrial digital multimedia broadcasting by filtering and amplifying only signals and outputting them in a wired or wireless manner.

Recently, Terrestrial Digital Multimedia Broadcasting (T-DMB) service, which can freely receive digital voice and video information by using some channels of the VHF band, has been launched. Except for this, the service is hardly achieved. On the other hand, in the terminal field, devices that receive broadcasts by connecting to mobile phones, PDAs, and notebook computers equipped with T-DMB reception functions as well as dedicated terminals have been released. There is a situation.

The present invention was devised to solve the phenomenon that the terrestrial digital multimedia broadcasting reception area is extremely limited as described above, so as not to meet the user's demand, and branched the signal received from the TV coaxial distribution network of a large-scale assembly building. The technical task of the present invention is to provide a terrestrial digital multimedia broadcasting receiver capable of receiving high quality terrestrial digital multimedia broadcasting in a small shadow area inside a building by filtering, amplifying and broadcasting only a broadcast (T-DMB) signal. Shall be.

In order to solve the above problems, the terrestrial digital multimedia broadcasting receiver 200 using a public hearing network according to the present invention includes a connection terminal 201 connected to a public hearing terminal inside a building; and a signal received through the connection terminal. A first divider 202 for distributing two paths; and a first impedance converter 203 for converting impedance by receiving a signal distributed from one terminal of the first divider; and receiving a signal from the first impedance converter. A first amplifier 204 for amplifying with a gain; and first and second filters 205 and 206 for filtering the low and high bands of the terrestrial digital multimedia broadcasting by splitting the output signal of the first amplifier. A second amplifier 207 for synthesizing the outputs of the first and second filters and amplifying them with a predetermined gain; and terrestrial digital multimedia broadcasting signals output from the second amplifier in a building. A transmission antenna 208 for exporting to a small shadow area of the transmission line; and a transmission line 209 for transmitting a signal distributed from the other terminal of the first distributor; and a TV signal output terminal for receiving and outputting a TV signal from the transmission line. 210); And a power supply unit 211 for supplying power to the first and second amplifiers.

In addition, the terrestrial digital multimedia broadcasting receiver 200 using the public hearing network according to the present invention includes: a connection terminal 201 connected to a public hearing terminal inside a building; and a signal received through the connection terminal for distributing the signals received in two paths. A first splitter 202; and a first impedance converter 203 for receiving a signal distributed from one terminal of the first splitter and converting an impedance; and a first amplifier receiving a signal from the first impedance converter and amplifying the signal with a predetermined gain; First and second filters 205 and 206 for dividing the output signal of the first amplifier and the low and high bands of the terrestrial digital multimedia broadcasting, respectively; and the first and second filters. A second amplifier 207 for synthesizing the output of the amplifier and amplifying the amplifier with a predetermined gain; and a second divider 212 for distributing the signal output from the second amplifier in two paths; and one end of the second divider. A transmission antenna 208 for distributing the terrestrial digital multimedia broadcasting signal distributed from the antenna to a small shadow area inside the building; and a second impedance converter for receiving the terrestrial digital multimedia broadcasting signal distributed from the other terminal of the second distributor and converting impedance (213); and a T-DMB signal output terminal (214) for receiving and outputting a signal from the second impedance converter; and a transmission line (209) for transmitting a signal distributed from the other terminal of the first distributor; and the transmission A TV signal output terminal 210 for receiving and outputting a TV signal from a line; And a power supply unit 211 for supplying power to the first and second amplifiers.

Hereinafter, a preferred embodiment of a terrestrial digital multimedia broadcasting receiver using a public hearing network according to the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same reference numerals are given to the same members, and duplicated descriptions thereof will be omitted.

1A is a conceptual diagram of a terrestrial digital multimedia broadcasting service. As shown, the broadcasting center 101 transmits audio and video broadcasting or various contents received from a program provider to the transmitting center 102, and the transmitting center transmits the VHF band (174 to 216 MHz) via the terrestrial transmitting station 103. ) Transmits a broadcast signal, and if necessary, the relay station 104 receives the transmission signal from the transmission station and retransmits it. Therefore, a broadcast signal is received by using a portable terminal, a terminal mounted in a vehicle, and a receiving terminal 105 such as a mobile phone or PDA having a T-DMB receiving function.

FIG. 1B is a diagram illustrating a conventional public hearing network configuration, and FIG. 1C is a diagram illustrating the flow of a TV signal in FIG. 1B. The process of transmitting a TV signal to each home in FIGS. 1B and 1C is as follows. First, in FIG. 1B, a TV signal transmitted from a broadcasting station or a satellite is received through the TV antenna 112 or the satellite antenna 111, and then branched from the head end 113 to be transmitted to the assembly building 114. Since the signal is attenuated by a furnace or the like, the first to fourth amplifiers 115a to 115d amplify by a predetermined gain to compensate for this.

Next, the flow of receiving the TV signal sent to each building in the subscriber's home in Figure 1c as follows. Since the TV signal amplified by the first amplifier 115a and introduced into the building is branched to each floor by the branching means 116a to 116c, and output through the public hearing terminals 117a to 117c as many subscribers as each floor, In each household, the TV receiver 118a is connected to the public hearing terminal to watch TV broadcast. As the branching means 116a to 116c as described above, a coupler or a distributor is usually used.

2 is a diagram illustrating a connection of a terrestrial digital multimedia broadcasting receiver using a public hearing network according to the present invention, and is for receiving terrestrial digital multimedia broadcasting in a small shadow area such as a home or an office using the public hearing network as described above. . As shown, the terrestrial digital multimedia broadcasting receiver 200 according to the present invention is connected to the public hearing terminal 117c of FIG. 1C to output a conventional TV signal and a terrestrial digital multimedia broadcasting signal of the present invention.

3 is a block diagram showing the configuration of a terrestrial digital multimedia broadcasting receiver using a public hearing network according to the present invention. As shown, the terrestrial digital multimedia broadcasting receiver 200 according to the present invention includes a connection terminal 201 connected to a public hearing terminal of each subscriber's premises in the building in a TV coaxial distribution network of a large-scale assembly building, and the connection. A first divider 202 for distributing the signal input to the terminal in two paths, and a first impedance converter 203 for converting the impedance by receiving the signal from one terminal (the upper terminal in FIG. 3) of the first divider. And a first amplifier 204 for receiving a signal from the first impedance converter and amplifying the signal with a predetermined gain, and branching the output signal of the first amplifier to filter only the low band and the high band of the terrestrial digital multimedia broadcasting. First and second filters 205 and 206, a second amplifier 207 for synthesizing the outputs of the first and second filters and amplifying them with a predetermined gain, and outputting from the second amplifier. A transmission antenna 208 for transmitting the terrestrial digital multimedia broadcasting signal to a small shaded area inside the building, a transmission line 209 for transmitting a signal distributed from the other terminal (lower terminal in FIG. 3) of the first distributor, And a TV signal output terminal 210 for receiving and outputting a TV signal from the transmission line and a power supply unit 211 for supplying power to the first and second amplifiers.

FIG. 4 is a block diagram illustrating another embodiment of FIG. 3, wherein a second divider 212 and a second impedance converter 213 are provided between the second amplifier 207 and the transmitting antenna 208 in the configuration of FIG. 3. Is further provided. In this way, the second divider 212 is further provided to branch the terrestrial digital multimedia broadcasting signal, and the second impedance converter 213 is further provided on one of the branched paths, thereby providing a wireless scheme by the transmitting antenna 208. In addition, the T-DMB signal output terminal 214 can receive terrestrial digital multimedia broadcasting even in a wired manner.

3 and 4, the first and second dividers 202 and 212 may be used to share the power input thereto in two paths, but the present invention is not limited thereto. Power distribution may also be used. In addition, the receiver according to the present invention has a TV signal output terminal 210 as described above, the TV receiver can be connected in a wired manner, and the terrestrial digital multimedia broadcast signal transmitted by the transmission antenna 208 It may be received by a terminal in a space such as a home or an office by a wireless method, or a terrestrial digital multimedia broadcasting terminal may be connected by a T-DMB signal output terminal 214 in a wired manner.

3 and 4, the connection terminal 201 uses a 75-ohm (Ω) F-type connector, which is a characteristic impedance of a TV public hearing network, and the present invention uses a first terminal at one terminal of the first distributor 202. An impedance converter 203 is provided to convert a 75 ohm characteristic impedance of a TV public hearing network into a 50 ohm characteristic characteristic of a high frequency circuit, and a transmission line 209 having a characteristic impedance of 75 ohms is provided at the other terminal of the first distributor 202. And a second impedance converter 213 at one terminal of the second divider 212 in FIG. 4 to output a 50 ohm characteristic impedance of the high frequency circuit. The output is converted to 75 ohms which is the characteristic impedance of public hearing network.

3 and 4, the first and second filters 205 and 206 filter only the low band and the high band of the terrestrial digital multimedia broadcasting, respectively, and the low band filtered by the first filter is channel 8 (180 to 180). 186 MHz) and the high band filtered by the second filter is channel 12 (204-210 MHz). By separating and filtering the bands as described above, the quality of the terrestrial digital multimedia broadcasting signal can be improved.

5 is an external view of a terrestrial digital multimedia broadcasting receiver using a public hearing network according to the present invention. The above-described TV signal and T-DMB signal can be received only by connecting the connection terminal 201 to the public hearing terminal. Will be. In FIG. 5, the directional antenna of the plate shape is preferably used so that the transmitting antenna 208 can be mounted inside the receiver 200, but a linear omnidirectional antenna exposed to the outside may be used.

Although the present invention has been described in detail with reference to preferred embodiments of the present invention, the present invention is not limited to the above embodiments only, and modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

The terrestrial digital multimedia broadcasting receiver using the public hearing network according to the present invention as described above divides the signal received from the TV coaxial distribution network of a large-scale assembly building and filters and amplifies only the terrestrial digital multimedia broadcasting (T-DMB) signal to wire or wirelessly. In this way, it is possible to receive high quality terrestrial digital multimedia broadcasting even in a small shaded area inside the building.

Claims (6)

In the terrestrial digital multimedia broadcasting receiver, A connection terminal connected to the public hearing terminal inside the building; A first divider for distributing the signal received at the connection terminal in two paths; A first impedance converter which receives a signal distributed from one terminal of the first distributor and converts an impedance; A first amplifier receiving a signal from the first impedance converter and amplifying the signal with a predetermined gain; First and second filters branching an output signal of the first amplifier to filter low bands and high bands of terrestrial digital multimedia broadcasting, respectively; A second amplifier for synthesizing the outputs of the first and second filters and amplifying them with a predetermined gain; A transmission antenna for transmitting the terrestrial digital multimedia broadcasting signal output from the second amplifier to a small shadow area inside the building; A transmission line transmitting a signal distributed from the other terminal of the first distributor; A TV signal output terminal for receiving and outputting a TV signal from the transmission line; And Terrestrial digital multimedia broadcasting receiver using a public hearing network comprising a; power supply unit for supplying power to the first and second amplifiers. In the terrestrial digital multimedia broadcasting receiver, A connection terminal connected to the public hearing terminal inside the building; A first divider for distributing the signal received at the connection terminal in two paths; A first impedance converter which receives a signal distributed from one terminal of the first distributor and converts an impedance; A first amplifier receiving a signal from the first impedance converter and amplifying the signal with a predetermined gain; First and second filters branching an output signal of the first amplifier to filter low bands and high bands of terrestrial digital multimedia broadcasting, respectively; A second amplifier for synthesizing the outputs of the first and second filters and amplifying them with a predetermined gain; A second divider for distributing the signal output from the second amplifier in two paths; A transmission antenna for transmitting the terrestrial digital multimedia broadcasting signal distributed from one terminal of the second distributor to a small shadow area inside the building; A second impedance converter which receives the terrestrial digital multimedia broadcasting signal distributed from the other terminal of the second distributor and converts the impedance; A T-DMB signal output terminal for receiving a signal from the second impedance converter and outputting the signal; A transmission line transmitting a signal distributed from the other terminal of the first distributor; A TV signal output terminal for receiving and outputting a TV signal from the transmission line; And Terrestrial digital multimedia broadcasting receiver using a public hearing network comprising a; power supply unit for supplying power to the first and second amplifiers. The method of claim 2, The second impedance converter is a terrestrial digital multimedia broadcasting receiver using a public hearing network, characterized in that for converting a 50 ohm characteristic impedance into 75 ohms. The method according to claim 1 or 2, And the first impedance converter converts a characteristic impedance of 75 ohms into 50 ohms. The method according to claim 1 or 2, The terrestrial digital multimedia broadcasting receiver using a public hearing network, wherein the low band of the terrestrial digital multimedia broadcasting has a frequency of 180 to 186 MHz (channel 8). The method according to claim 1 or 2, The terrestrial digital multimedia broadcasting receiver using a public hearing network, characterized in that the high band of the terrestrial digital multimedia broadcasting has a frequency of 204 to 210 MHz (channel 12).

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