KR101434411B1 - Repeater system of wireless broadcasting signal with digital signal processing - Google Patents

Abstract

The present invention relates to a radio broadcast signal relay system by digital signal processing for separating signals of respective channels of an FM (FM) radio broadcast signal wirelessly received on the ground and regulating them to a uniform level and re- (DSP) processing of broadcast signals for each channel, which are installed in the central control center of the subway, for each channel, in the master and spare units, respectively, to a uniform level for each channel, And transmits the selected one of the broadcast signals together with the fault diagnosis signal; And a control unit for controlling the broadcast signals of the respective channels transmitted from the parent station relay apparatus to a uniform level and outputting the signals to the wireless antenna and the leakage cable, A plurality of local relay apparatuses for transmitting to the parent station relay apparatus together with a unique number; And an optical cable for connecting the host relay apparatus and the host relay apparatus and transmitting a broadcast signal and a failure diagnostic signal output from the host relay apparatus and transmitting a failure occurrence signal output from the host relay apparatus to the host relay apparatus It has an effect of relaying an FM broadcast signal in all the shaded areas of a subway including a narrow and very long and a plurality of stations, and relaying the broadcast signal by adjusting the signal level of each channel of the FM broadcast signal to a constant level.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a repeater system of wireless broadcasting signal with digital signal processing (DSP)

The present invention relates to an apparatus for relaying a radio broadcast signal in a shadow area, and more particularly, to an apparatus for relaying an FM (Radio Frequency) broadcast signal wirelessly received on the ground to a signal for each channel, And a digital broadcasting signal processing (DSP) for re-broadcasting to the line.

Generally, it is ideal that a radio broadcasting or communication signal has no obstacle between the transmitting position and the receiving position, and the obstacle obstructs the transmission (propagation) of the radio signal.

The obstacles that impede the transmission of wireless signals may be buildings, hills, caves, etc. Shadow areas are areas where radio signals do not reach or are unusable due to obstructions.

The shaded area may include a subway section including a building interior, an underground parking lot, an underground shopping arcade, an underground cave, an underground road, and a history and a railway line where radio waves are difficult to reach or blocked, such as tunnels, department stores and theaters.

Broadcasting is the most excellent medium that can deliver various information to a large number of people distributed in a wide area at a low cost and at the same time at a low cost. Especially, it is able to quickly transmit an urgent situation such as a disaster to a large number of people, An FM (frequency modulation) broadcast signal can be mainly used.

In the case of the subway, many people move underground, so that the FM (FM) broadcast signal including the communication needs to be received in the inner section of the subway.

A device that transmits radio signals to a shaded area is called a repeater. In particular, in the case of a subway, a railroad section is very long and a history of a station function is included in the middle, so that a radio signal is transmitted to all sections of the subway Development is needed.

Hereinafter, the shaded area will be described as a region formed by the subway, and the radio signal will be a broadcast signal according to the FM (FM). The device and the system have the same meaning and the system will be mainly used.

There is a " broadcast relay device " according to the Utility Model Registration Application No. 1980-1058 (Feb. 21, 1980), which relays broadcast signals to the subway according to the prior art.

1 is a functional block diagram of a radio broadcasting signal relay system by digital signal processing according to the prior art.

Hereinafter, a radio broadcast signal relay system using digital signal processing will be described in detail with reference to the accompanying drawings. The radio broadcast signal relay system includes an antenna 1, a receiver 111, an amplification unit 222, and a transmitter 333.

The antenna 1 receives the terrestrial broadcast signal f1 and transmits it to the receiver 111. The receiver 111 mixes the received signal with the signal f2 generated by the local oscillator to convert the frequency f0, To the transmitter 333.

The signal f2 oscillated in the local oscillation unit is cascade-cascaded and amplified so that the signal f2 is stabilized not to flow in the reverse direction and then transmitted to the transmitter 333. The transmitter 333 amplifies the input signal f0, And mixes one signal f2, restores the signal of the original frequency f1 received by the antenna 1, and transmits or outputs the signal.

Such a conventional technology has a structure that receives a high frequency of a radio signal, converts it to a low intermediate frequency, amplifies it, and outputs the converted high frequency to the original high frequency.

However, there is a problem that the process and configuration for converting the high frequency to the intermediate frequency, then amplifying the high frequency, and then converting the high frequency to the high frequency are complicated and the device becomes expensive.

In addition, the conventional technique has a problem that it can not be used in a place having a long section such as a subway.

Therefore, it is necessary to develop a technology that can relay radio broadcast signals over narrow and long sections such as subways, simplify the system configuration, and reduce the price.

In order to solve the problems and necessities of the related art as described above, the present invention provides a digital signal processing method and a digital signal processing method for digital signal processing that relays a broadcast signal to a shaded area including a long section such as a subway, Thereby providing a relay system.

Further, the present invention provides a radio broadcasting signal relay system by digital signal processing for adjusting or adjusting the signal level of each channel of a radio received broadcast signal to a certain level by digital signal processing technology and relaying the signal level to a shaded area inside the subway do.

In order to accomplish the object of the present invention, a radio broadcast signal relay system based on digital signal processing is installed in a central control center of a subway, and a broadcast signal for each channel received by radio is processed by a DSP and a DSP, A host relay device for controlling the host device to a uniform level and transmitting any one of the broadcast signals selected from the broadcast signals output from the host device and the spare device together with the fault diagnosis signal; And a control unit for controlling the broadcast signals of the respective channels transmitted from the parent station relay apparatus to a uniform level and outputting the broadcast signals to the wireless antenna and the leakage cable, A plurality of local relay apparatuses for transmitting to the parent station relay apparatus together with the corresponding identification numbers; And an optical cable for connecting the host relay apparatus and the host relay apparatus and transmitting a broadcast signal and a failure diagnostic signal output from the host relay apparatus and transmitting a failure occurrence signal output from the host relay apparatus to the host relay apparatus The radio antenna may be installed in the interior of the subway, and the leakage cable may be installed inside the tunnel of the subway.

Wherein the parent station repeater receives a broadcast signal received by a wireless antenna installed in the central control center, low-noise amplifies the broadcast signal, and outputs the broadcast signal to two paths; A main host signal unit for inputting any broadcast signal output from the LNA unit and uniformly controlling the level of a signal detected for each channel by a corresponding control; A preamble signal unit for inputting another broadcasting signal output from the LNA unit and uniformly controlling the level of a signal detected for each channel by a corresponding control; A selector for inputting a broadcast signal outputted by the main parent station signal unit and a broadcast signal outputted from the preliminary parent station signal unit and selecting one of the broadcast signals according to the corresponding control signal; An amplifier unit for receiving the broadcast signal outputted by the selector and amplifying the power of the broadcast signal; An optical transceiver for converting the broadcast signal output from the amplifier unit into an optical signal and outputting the optical signal, converting the broadcast signal into an electric signal when the optical signal is input, and outputting the electric signal; And controlling the selection unit to select an optimal broadcast signal by monitoring broadcast signals and output broadcast signals input from the main parent station and the preliminary parent station signal unit, and controlling the plurality of child station repeaters to be controlled by the optical transmitter- And a control unit for outputting the corresponding control signal and the fault diagnosis signal and receiving the fault occurrence signal.

The local relay apparatus converts the broadcast signal and the fault diagnosis signal, which are input to the optical cable, into an optical signal, and outputs the electrical signal to each path. When the fault diagnosis signal and the fault occurrence signal are inputted, An optical transceiver for converting the optical signal into an optical signal and outputting the optical signal to the optical cable; A subscriber station signal unit connected to the optical transceiver unit and receiving the broadcast signal to perform low noise amplification, adjusting a level of each channel to be constant, amplifying and outputting power; Reception unit, receives the fault diagnosis signal to monitor the signal unit of the local station, generates a fault occurrence signal when a fault occurs, adds the corresponding fault number to the optical transmission / reception unit, and outputs the signal to the optical transmitter- A fault diagnosis unit; A mixer unit connected to an output terminal of the local signal unit and inputting an external signal, mixing the local signal with the broadcast signal, and outputting the mixed signal to a plurality of paths; A wireless antenna installed in the subway history may be connected to one of the paths of the mixer unit and the leakage cable may be connected to the other path of the mixer unit.

The main parent station signal unit or the preliminary parent station signal unit receives the broadcast signal, converts the broadcast signal into a digital signal, classifies the signal by each channel, detects the gain of the broadcast signal for each channel to a level of -40 dBm, And outputting a plurality of D / A blocks.

The DESPE block is an ADDU that converts an input broadcast signal into a digital signal; A filter unit for separating a signal of a channel designated by the control signal from the input digital broadcast signal and adjusting the gain to a gain of -40 dBm level and outputting the signal; And a DIA for converting a digital broadcasting signal of the channel output from the filter unit into an analog signal.

Wherein the filter unit passes a high frequency band signal of a channel specified by the corresponding control signal among the digital broadcasting signals and down converts the frequency to a baseband; (DUC) for adjusting the level of the baseband signal of the channel output by the decoding to a gain designated by the control signal and up-converting the baseband signal to the high-frequency band signal; A filter updating unit connected to the digital broadcasting and outputting the control signal including a filter coefficient value for allowing a high frequency band signal of the designated channel to pass through the digital broadcasting signal; And an AGC (AGC) connected to the receiver and for outputting the gain value at which the baseband signal is adjusted to a selected level.

A first amplifier for receiving the broadcast signal, pre-amplifying the broadcast signal by low noise, and outputting the broadcast signal through a plurality of paths; The first amplifier is connected to the first amplifier through a path, converts the broadcast signal into a digital signal, classifies it by channel, detects the gain of the broadcast signal for each channel to a level of -40 dBm, A plurality of D / A blocks converting and outputting the D / A blocks; And a second amplifier connected to each output path of the plurality of D / A blocks and amplifying and outputting power of the input broadcasting signal; Wherein the first amplifier, the plurality of D / A blocks, and the second amplifier constitute a local station module,

According to the present invention, the above-described configuration is capable of relaying an FM broadcast signal by digital signal processing technology to all shaded areas of a subway where a narrow and very long length is included.

Also, according to the present invention, it is possible to relay broadcasts by adjusting or adjusting the level of a signal for each channel by a digital signal processing technique on an RF broadcast signal received wirelessly.

1 is a functional block diagram of a radio broadcasting signal relay system by digital signal processing according to the prior art,
FIG. 2 is a diagram showing the overall functional configuration of a radio broadcasting signal relay system by digital signal processing according to an embodiment of the present invention,
FIG. 3 is a functional block diagram of a home-office relay apparatus according to an embodiment of the present invention;
4 is a functional block diagram of a parent station signal unit according to an embodiment of the present invention;
5 is a functional block diagram of a D / A block according to an embodiment of the present invention.
FIG. 6 is a functional block diagram of a local station relay apparatus according to an embodiment of the present invention;
FIG. 7 is a functional block diagram of a local signal unit according to an embodiment of the present invention;
FIG. 8 is a diagram illustrating a level waveform of a signal input to and output from a parent station signal unit of a wireless broadcast signal relay system by digital signal processing according to an exemplary embodiment of the present invention,
And
FIG. 9 is a photograph of a level waveform and a photograph of an experiment work, in which a wireless broadcast signal relay system by digital signal processing according to an embodiment of the present invention scans an FM signal relayed in the subway history and displays the signal by channel.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, digital signal processing (DSP) and digital signal processing (DSP) have the same meaning.

FIG. 2 is a functional block diagram of a wireless broadcast signal relay system by digital signal processing according to an embodiment of the present invention, FIG. 3 is a functional configuration diagram of a parental station relay apparatus according to an embodiment of the present invention, FIG. 5 is a functional block diagram of a Deseb block according to an embodiment of the present invention, and FIG. 6 is a functional block diagram of a local station relay apparatus according to an embodiment of the present invention. FIG. 7 is a functional block diagram of a local signal unit according to an embodiment of the present invention.

Hereinafter, the wireless broadcast signal relay device 900 will be described in detail with reference to the accompanying drawings. The wireless broadcast signal relay device 900 includes a home country relay device 1000, a local relay device 2000, and an optical cable 3000.

The host relay apparatus 1000 may be installed in a specific area or a central control center of a subway with a wireless antenna capable of receiving an FM radio broadcast signal.

The host relay apparatus 1000 performs digital signal processing or DSP (digital signal processing) processing on an FM broadcast signal wirelessly received for each channel CH by a working device and a standby or redundancy device, respectively, And adjust or control so as to be a uniform level.

Here, the level of the signal for each channel may include at least one of amplification and suppression, and the level of the signal for each channel is controlled to be the same or uniform.

In addition, the home agent repeater 1000 analyzes input and output signals of the host and the backup device, selects a relay broadcast signal output from any one of the devices and determined to be in an optimal state, To the relay apparatus 2000 or the relay station.

The relay station has the same configuration as that of the relay station 2000 and has a changed operation mode. The relay station is installed between the relay station 1000 and the relay station 2000 located at a remote location, The signal transmitted and received between the apparatus 2000 is relayed, and the description and the drawings are not given in the drawings and will not be described.

The local station relay apparatus 2000 is installed in each station or history 4000 of the subway and is connected to the home station relay apparatus 1000 through an optical cable 3000 to receive broadcast signals for relay broadcasting.

The child station relay apparatus 2000 wirelessly outputs the broadcast signal received from the parent station relay apparatus 1000 through the optical cable 3000 through the wireless antenna 4200 installed in the waiting room 4000 and the landing station 4100 And outputs the signal to the inside of the tunnel 5000 through a leakage cable 5100 installed on a line or the like.

Therefore, when using the subway, the FM (FM) broadcasting signal can be received wirelessly in the history (4000) and all the sections where the subway moves.

On the other hand, the local station relay apparatus 2000 diagnoses whether the local station relay apparatus 1000 itself operates normally according to the fault diagnosis signal transmitted from the parent station relay apparatus 1000, and checks the time, position, And transmits it to the parent station relay apparatus 1000 together with the number (ID).

Therefore, the parent station relay apparatus 1000 identifies a plurality of the child station apparatuses 2000 by its own identification number (ID) and can confirm whether the relay station apparatus 2000 is operating normally or has failed and can not relay broadcasts. If necessary, .

The parent station relay apparatus 1000 can check whether each of the child station apparatuses 2000 has failed or not by checking the control unit 1700 or perform necessary control.

The optical cable 3000 connects the parent station relay apparatus 1000 and the plurality of child station relays 2000 and transmits and receives an FM relay broadcast signal and a corresponding communication signal and a control signal, Can be transmitted at the same time.

The wireless broadcast signal relay system 900 using the digital signal processing can use the wireless antenna 4200 or the leakage cable 5100 in the waiting room 4100 of the history 4000 of the subway section and the platform 5000 It is preferable to use the leakage cable 5100 in the inside.

The host relay apparatus 1000 includes a low noise amplifier (LNA) unit 1100, a main host signal unit 1200, a preliminary host signal unit 1300, a selection unit 1400, an amplifier unit 1500, A transmission / reception unit 1600, a control unit 1700, and a monitor unit 1800.

The LNA unit 1100 receives an FM broadcast signal received by a wireless antenna such as a central control headquarters, amplifies the LFO broadcast signal with low noise, and outputs the amplified signal to two paths.

The main parent station signal section 1200 and the preliminary parent station signal section 1300 are connected to any one of the two output paths of the LNA unit 1100 and have the same configuration and functions and have the same functions and functions.

Therefore, the main host signal part 1200 will be mainly described below, and the preliminary home signal part 1300 will be described when necessary.

The main host signal unit 1200 inputs a broadcast signal of one path output from the LNA unit 1100 and adjusts the signal level of each channel of the broadcast signal to be a uniform level by the corresponding control and outputs the signal.

In one embodiment, the primary home signal unit 1200 separates and receives a corresponding broadcast signal for each channel from an FM broadcast signal, and uniformly adjusts the received broadcast signal to a level of -40 dBm.

The main host signal unit 1200 includes a plurality of D / A blocks 1210, 1220 and 1230, and each D / A block 1210, 1220 and 1230 separates and demultiplexes a specific channel signal from the A / .

In an exemplary embodiment, each D / A block 1210, 1220, and 1230 amplifies -40 dBm if the received signal level is -60 dBm and -40 dBm when the received signal level is -30 dBm. Amplification or suppression is adjusted to have a uniform level.

These D / A blocks 1210, 1220, and 1230 will be described in detail below again.

The selection unit 1400 receives the broadcast signal output from the primary parent station signal unit 1200 and the broadcast signal output from the primary parent station signal unit 1300 and outputs the selected one So that a broadcast signal is inputted and outputted.

The amplifier unit 1500 receives a broadcast signal selected and output by the selection unit 1400 according to a corresponding control signal of the control unit 1700, amplifies the power to a predetermined level, and outputs the amplified broadcast signal.

The optical transceiver 1600 receives an electrical signal (electric signal) of the amplifier unit 1500 and converts the electrical signal into an optical signal and outputs the optical signal to the optical cable 3000 or converts the optical signal input from the optical cable 3000 into an electrical signal And outputs it to the control unit 1700.

The control unit 1700 includes a signal output from the LNA unit 1100 and input to the main host signal unit 1200 and the preliminary host signal unit 1300 and a signal input from the main host signal unit 1200 and the preliminary host signal unit 1300 And outputs the selected control signal to the selection unit 1400 so that the optimum broadcast signal is selected.

The manner in which the control unit 1700 monitors the broadcast signal may include a signal-to-noise ratio (S / N), a signal level, and the like.

That is, the control unit 1700 may output a corresponding control signal for selecting a broadcast signal having a high SNR if the SNR is less than a reference value even if the broadcast signal has a high level.

Meanwhile, the control unit 1700 outputs a failure diagnostic signal for monitoring and confirming whether each of the host repeaters 2000 operates normally without any error or trouble, And received.

The control unit 1700 preferably transmits and receives a fault diagnosis signal, a fault occurrence signal, various control signals and data through the optical transceiver 1600.

The monitor unit 1800 monitors a broadcast signal output from the parent station 1000 for relaying by selecting it. The monitor unit 1800 can select a broadcast signal for each channel, output it as an audio signal, output it as a monitor or a high- have.

The plurality of diese (DSP) blocks constituting the parent station signal parts 1200 and 1300 include a first diese block 1210, a second diese block 1220 and an nth diese block 1230 as an embodiment, The first D / A block or the D / A block will be mainly described.

The DSP block 1210 receives a broadcast signal and converts the signal into a digital signal, classifies the signal, and adjusts the gain of the broadcast signal for each channel to a level of -40 dBm, And includes an ADD-C 1211, a filter unit 1212, and a DIA-C 1213.

The ADI 1211 converts the input analog broadcasting signal into a digital broadcasting signal and outputs the digital broadcasting signal to the filter unit 1212.

The filter unit 1212 digitally filters and passes only a broadcast signal of a specific channel by a corresponding control signal.

In addition, the filter unit 1212 adjusts the broadcast signal of the specific channel selected by the corresponding control signal to have a uniform level, that is, a level of -40 dBm.

If the broadcast signal of a specific channel is lower than -40 dBm, even if the power is amplified and output, the user is hard to listen to the broadcast signal of the corresponding channel. If the broadcast signal is higher than -40 dBm, It is difficult to amplify and broadcast it. That is, if the power amplification factor is higher than -40 dBm, the amplification capacity of the power amplification stage must be increased, which leads to unnecessarily large size, high power consumption, and high cost.

By repeatedly experimenting, it is possible to uniformly adjust the level of the broadcast signal for each channel to -40 dBm, thereby optimizing the size of the entire system and optimizing the power consumption and the price.

This filter unit 1212 is configured to include a disable unit 1214, a disable unit 1215, a filter update unit 1216, and an age unit 1217.

A digital down converter (DDC) 1214 passes only a signal of a selected band among the digital broadcasting signals, thereby outputting a broadcasting signal of a selected channel, and at the same time, down-converting a high-frequency signal of a selected channel to a baseband signal .

A digital up converter (DUC) 1215 adjusts a baseband broadcast signal of a specific channel output by the decoders 1214 to a level (-40 dBm) specified by a corresponding control signal, and then upconverts the high- .

The filter updating unit 1216 is connected to the destination unit 1214 and outputs a filter coefficient value and a corresponding control signal for allowing the high-frequency band broadcasting signal of the designated channel to pass.

An AGC (automatic gain control) unit 1217 outputs a reference gain value for connecting the digital broadcast signal to the digital broadcast signal 1215 and adjusting the digital broadcast signal converted to the baseband to a uniform level.

The local station relay apparatus 2000 includes a light transmitting / receiving unit 2100, a local station signal unit 2200, a fault diagnosis unit 2300, a mixer unit 2400, and a monitor unit 2500.

The optical transceiver unit 2100 is connected to the optical cable 3000. When the optical signal is input, the optical transceiver unit 2100 converts the optical signal into an electric signal and outputs the electric signal. When the electric signal is input, the optical transceiver unit 2100 converts the optical signal into an optical signal, same.

The optical signal may include a broadcast signal, a fault diagnosis signal, and a fault occurrence signal.

The optical transceiver 2100 converts the input optical signal into an electrical signal, outputs the broadcast signal to the self-station signal unit 2200, and outputs the failure diagnosis signal and the failure occurrence signal to the failure diagnosis unit 2300.

The self-station signal unit 2200 amplifies and outputs the amplified broadcast signal by low-noise amplifying the amplified broadcast signal from the optical transmitter / receiver unit 2100 so that the level is constant for each channel, do.

Each of the local station modules 2210 includes a first amplifier section 2211, a D / A block 1210, and a second amplifier section 2212.

The failure diagnosis unit 2300 is connected to the optical transceiver 2100 and inputs a failure diagnosis signal to monitor a failure including an error of the self-station signal unit 2200. If a failure occurs, the failure diagnosis signal is generated, To the optical transmitter-receiver unit 2100, and is transmitted to the host-relay apparatus 1000.

The mixer unit 2400 is connected to the output terminal of the local signal unit 2200, receives an external signal, and mixes the broadcast signal with the relayed broadcast signal, and outputs the mixed signal to the two paths.

The wireless antenna 4200 may be connected to one of the two output paths of the mixer section 2400 and the leakage cable 5100 may be connected to the other path.

The antenna 4200 may be provided with a new antenna inside the subway or a wireless antenna 4200 installed for a DMB or the like.

The antenna 4200 and the leakage cable 5100 all output broadcast signals wirelessly.

The monitor unit 2500 may output a high frequency signal so that it can be selected as an audio signal for each channel among the broadcast signals to be confirmed as an audible signal or measured by an oscilloscope or spectrum analyzer measurement equipment.

The monitor unit 2500 performs the same or similar functions and functions as the monitor unit 1800 of the home-office relay apparatus 1000, and therefore, no further description will be given.

The first amplifier unit 2211 constituting the local station module 2210 receives a high frequency broadcast signal, pre-amplifies the broadcast signal by low noise, outputs the broadcast signal to a plurality of paths, respectively, and a diese block 1210 is connected to each output path.

The diese block 1210 formed in the local station module 2210 has the same structure and function as the diese block 1210 constituting the parent station signal units 1200 and 1300 and will not be described in detail.

The second amplifier unit 2212 constituting the local station module 2210 inputs and mixes broadcasting signals for respective channels output from the plurality of D / A blocks 1210, amplifies the power of the mixed broadcasting signals, Respectively.

The two paths output by the second amplifier section 2212 include a path output to the monitor section 2500 and a path output to the mixer section 2400.

FIG. 8 is a photograph of a level waveform in which signals input to and output from a parent station signal unit of a wireless broadcast signal relay system by digital signal processing according to an embodiment of the present invention are scanned and displayed for each channel, FIG. 6 is a photograph of a level waveform and a photograph of an experimental work, in which a wireless broadcast signal relay system by digital signal processing according to an embodiment of the present invention scans an FM signal relayed in the subway history and displays the signal by channel.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. An FM broadcast signal, which is uniformly low-noise amplified from the LNA section of the wireless broadcast signal relay system and input to the main host signal section and the preliminary host signal section through two paths, FIG. 8 is a view showing a level waveform of a signal portion or a preamble signal portion of an FM broadcast signal output after being subjected to a digital signal processing or a Ds (DSP) processing and scrolling each channel to display a level waveform.

The waveform of the level at which the FM broadcasting signal is scanned for each channel can be displayed and displayed using a spectrum analyzer measuring instrument according to an exemplary embodiment.

When the broadcast signal received from the antenna and applied to the LNA section and amplified by the same uniform gain is analyzed, the level waveform of the signal for each channel is displayed as a high or low waveform.

That is, since the level values of the broadcast signals received for the respective channels are different from each other, they are shown as high or low and are shown on the left side of FIG.

When a broadcast signal having a different level for each channel is subjected to digital signal processing or DSP processing from the main host signal unit or the preliminary host signal unit, the signal is converted into a uniform level for each channel and output.

A state in which a broadcast signal is converted into a uniform level for each channel and output is shown on the right side of FIG.

Meanwhile, according to an embodiment of the present invention, an RF broadcasting signal relayed to a waiting room of a subway station and a platform is scanned by a spectrum analyzer measuring equipment and displayed on a channel-by-channel basis by a radio broadcasting signal relay system by digital signal processing. FIG. 9 shows a monitoring state of monitoring by the spectrum analyzer measurement equipment and the monitoring of the listening by FM radio while moving in the waiting room of the subway station and the platform.

FIG. 9 shows a state in which the FM broadcast signal relayed in the history of the subway is scanned by a spectrum analyzer measuring instrument according to an embodiment and displayed for each channel.

The receiver level (sensitivity) of the FM broadcast signal relayed in the subway history by the digital broadcast signal relaying system according to the embodiment of the present invention is shown in the following table.

The channel level of the FM broadcast signal received in the subway history number frequency Reception level number frequency Reception level One 89.12 MHz -63.98 dBm 6 98.88 MHz -63.85 dBm 2 89.70 MHz -64.07 dBm 7 97.30 MHz -62.10 dBm 3 93.90 MHz -65.28 dBm 8 98.10 MHz -63.12 dBm 4 94.50 MHz -64.38 dBm 9 99.10 MHz -65.07 dBm 5 95.15 MHz -64.03 dBm 10 101.92 MHz -65.67 dBm

Referring to Table 1, a radio broadcasting signal relay system using digital signal processing according to an embodiment of the present invention adjusts broadcasting signals for each channel of an FM broadcasting signal to a uniform level of -40 dBm, The status of relay broadcasting in the inside is a measurement value of a level scanned for each channel by using a measuring instrument such as a spectrum analyzer.

The FM broadcasting signal of each channel wirelessly broadcasted to the subway at a uniform level of -40 dBm through the antenna or leakage cable is attenuated while being propagated, and is confirmed to be received at a uniform level in the range of -62 dBm to -65 dBm .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

900: Wireless Broadcast Signal Relay System by Digital Signal Processing
1000: Host relay device 1100:
1200 main host signal part 1210 first dice block
1211: ADDED 1212: filter unit
1213: Dewey 1214: Didier
1215: Decoupling 1216: Filter update unit
1217: Age City 1220: 2nd dspee block
1230: nth dice block 1300:
1400: Selection part 1500: Amplifier part
1600, 2100: optical transmission / reception unit 1700:
1800, 2500: Monitor section 2000: Local station relay device
2200: Local signal unit 2210: Local station module
2211: first amplifier 2212: second amplifier
2300: Failure diagnosis part 2400: Mixer part
3000: Optical cable 4000: History
4100: platform 4200: antenna
5000: Tunnel 5100: Leaky cable

Claims (7)

(DSP) processing of broadcast signals for each channel, which are installed in the central control center of the subway, and for each channel, to a uniform level for each channel, A parent station relay device for transmitting any one of the broadcast signals together with the fault diagnosis signal;
And a control unit which is installed in each history of the subway and adjusts broadcasting signals for each channel transmitted by the parent station repeater to a uniform level and outputs them to an antenna and a leakage cable respectively and outputs a fault occurrence signal detected by the fault diagnosis signal, A plurality of local relay apparatuses for transmitting the local station relay apparatuses with the number to the host relay apparatus; And
An optical cable for connecting the host repeater and the host repeater to transmit a broadcast signal and a failure diagnosis signal output from the host repeater, and transmitting a fault occurrence signal output from the host repeater to the host repeater; ≪ / RTI >
Wherein the antenna is installed in a history of the subway and the leakage cable is installed in a tunnel of the subway.
The method according to claim 1,
The home country relay device
An LNA for receiving a broadcast signal received by a wireless antenna installed in the central control center, low-noise amplifying and outputting the broadcast signal through two paths;
A main host signal unit for inputting any broadcast signal output from the LNA unit and uniformly controlling the level of a signal detected for each channel by a corresponding control;
A preamble signal unit for inputting another broadcasting signal output from the LNA unit and uniformly controlling the level of a signal detected for each channel by a corresponding control;
A selector for inputting a broadcast signal outputted by the main parent station signal unit and a broadcast signal outputted from the preliminary parent station signal unit and selecting one of the broadcast signals according to the corresponding control signal;
An amplifier unit for receiving the broadcast signal outputted by the selector and amplifying the power of the broadcast signal;
An optical transceiver for converting the broadcast signal output from the amplifier unit into an optical signal and outputting the optical signal, converting the broadcast signal into an electric signal when the optical signal is input, and outputting the electric signal; And
The control unit controls the selection unit to select an optimal broadcast signal by monitoring broadcast signals and output broadcast signals input from the main parent station and the preliminary parent station signal unit, and controls the plurality of local station transponders to the optical transceiver unit A control unit for outputting the control signal and the fault diagnosis signal and receiving the fault occurrence signal; And transmitting the digital broadcast signal to the mobile station.
3. The method according to claim 1 or 2,
The local relay apparatus
And the failure diagnosis signal and the failure diagnosis signal are output to respective paths. When the failure diagnosis signal and the failure occurrence signal are inputted, the corresponding identification number is added to the optical signal, An optical transmission / reception unit for outputting the converted optical signal to the optical cable after conversion;
A subscriber station signal unit connected to the optical T / R unit and receiving the broadcast signal to perform low noise amplification, adjusting a level of each channel to be constant, amplifying and outputting power;
Reception unit, receives the fault diagnosis signal to monitor the signal unit of the local station, generates a fault occurrence signal when a fault occurs, adds the corresponding fault number to the optical transmission / reception unit, and outputs the signal to the optical transmitter- A fault diagnosis unit;
A mixer unit connected to an output terminal of the local signal unit and inputting an external signal, mixing the local signal with the broadcast signal, and outputting the mixed signal to a plurality of paths; , ≪ / RTI &
Wherein a wireless antenna installed in the subway history is connected to one of the paths of the mixer unit and the leakage cable is connected to the other path of the mixer unit.
3. The method of claim 2,
The primary mother station signal part or the primary mother station signal part
A plurality of D / A blocks for receiving the broadcast signals, converting the broadcast signals into digital signals, classifying the broadcast signals, detecting each channel, adjusting a gain of a broadcast signal for each channel to a level of -40 dBm, A radio broadcast signal relay system by digital signal processing.
5. The method of claim 4,
The D /
An adder for converting the input broadcast signal into a digital signal;
A filter unit for separating a signal of a channel designated by the control signal from the input digital broadcast signal and adjusting the gain to a gain of -40 dBm level and outputting the signal; And
A DIA for converting a digital broadcasting signal of a channel output from the filter unit into an analog signal; And transmitting the digital broadcast signal to the base station.
6. The method of claim 5,
The filter unit
A DDC for passing a high frequency band signal of a channel designated by the corresponding control signal among the digital broadcasting signals and down converting the frequency to a baseband;
(DUC) for adjusting the level of the baseband signal of the channel output by the decoding to a gain designated by the control signal and up-converting the baseband signal to the high-frequency band signal;
A filter updating unit connected to the digital broadcasting and outputting the control signal including a filter coefficient value for allowing a high frequency band signal of the designated channel to pass through the digital broadcasting signal; And
An AGC (AGC) connected to the decoder and outputting the gain value at which the baseband signal is adjusted to a selected level; And transmitting the digital broadcast signal to the base station.
The method of claim 3,
The local signal unit
A first amplifier for inputting the broadcast signal, pre-amplifying the broadcast signal by low noise, and outputting the broadcast signal through a plurality of paths;
The first amplifier is connected to the first amplifier through a path, converts the broadcast signal into a digital signal, classifies it by channel, detects the gain of the broadcast signal for each channel to a level of -40 dBm, A plurality of D / A blocks converting and outputting the D / A blocks; And
A second amplifier connected to each output path of the plurality of D / A blocks and amplifying and outputting power of the input broadcasting signal; , ≪ / RTI &
Wherein the first amplifier, the plurality of D / A blocks, and the second amplifier constitute a self-station module, and the plurality of D / E blocks, the plurality of D / E blocks, and the second amplifier constitute a self-station module.

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