KR100962628B1 - Apparatus and method for broadcasting signal leveling - Google Patents

Abstract

PURPOSE: An apparatus and a method for leveling a broadcasting signal are provided to level/amplify a signal of each channel, which is received at different power levels, at a stable power level without changing the structure of an existing amplifying device. CONSTITUTION: The first signal converter(108) converts a digital broadcasting signal into a digital I/Q signal per each channel using a frequency signal and a phase signal of each channel. A plurality of AGC(Auto Gain Controller)(110a~110n) amplifies a power level of a digital I/Q signal per each channel through AGC to a reference power level. The second signal converter(112) converts the amplified channel digital I/Q signal into a digital broadcasting signal per each channel. A controller(122) detects a frequency signal and a phase signal of each channel from an analog broadcasting signal.

Description

Apparatus and Method for Broadcasting Signal Leveling

The present invention relates to transmission and reception of broadcast signals, and more particularly, to an apparatus and method for leveling broadcast signals.

In general, an amplification device is installed and used to transmit a signal to a terminal in an environment where a weak radio wave or a signal transmission to the terminal is difficult. However, in the conventional amplification apparatus, a difference in power level of a signal transmitted through each channel may occur due to interference, fading, and multipath loss between signals during a signal transmission process from a base station or a broadcasting station to a terminal. In order to reduce the cost and simplify the configuration of the amplification device, a method of simply amplifying the signals of each channel was used.

Therefore, the conventional amplification device is not configured to amplify a signal for each channel, but to amplify the signals of all channels collectively, so that signals of each channel received at different power levels cannot be constantly output. There is a problem, and if the current amplifier must be changed in order to amplify the signal for each channel by using the existing amplifier, there is a problem that the structure of the amplifier must be complicated.

In addition, in the case of the existing amplifier, there is another problem that the amplifier itself must be changed even when the current broadcast is switched to digital broadcasting.

Disclosure of Invention The present invention is to solve the above-described problems, and provides a leveling apparatus and method for a broadcast signal that can amplify by leveling a signal of each channel received at a different power level to a constant power level without changing the structure of an existing amplifier. It is the technical problem to provide.

Another object of the present invention is to provide an apparatus and method for leveling a broadcast signal that can be used without changing the configuration even if the current broadcast is switched to digital broadcast.

According to an aspect of the present invention, an apparatus for leveling a broadcast signal includes an ADC for converting an analog broadcast signal received through a reception antenna into a digital broadcast signal; A first signal converter converting the digital broadcast signal into a digital I / Q signal for each channel by using a frequency signal and a phase signal of each channel; A plurality of AGCs for amplifying the power level of the digital I / Q signal for each channel to a reference power level through automatic gain control; A second signal converter for converting the amplified digital I / Q signal for each channel into a digital broadcast signal for each channel using the frequency signal and the phase signal of each channel; A signal synthesizer for synthesizing the digital broadcast signal for each channel; A DAC for converting the synthesized digital broadcast signal into an analog broadcast signal; And a controller for detecting a frequency signal and a phase signal of each channel from the analog broadcast signal and calculating a power level of the digital I / Q signal for each channel.

According to another aspect of the present invention, there is provided a method of leveling a broadcast signal, comprising: converting a digital broadcast signal into a digital I / Q signal for each channel; Amplifying the power level of the digital I / Q signal for each channel to a reference power level through auto gain control; Converting the amplified digital I / Q signal for each channel into a digital broadcast signal for each channel; And synthesizing the converted digital broadcast signal for each channel.

The method may further include receiving an analog broadcast signal and converting the analog broadcast signal into the digital broadcast signal before the digital I / Q signal conversion for each channel, and after synthesizing the digital broadcast signal for each channel. The method may further include converting the synthesized digital broadcast signal into an analog broadcast signal and transmitting the analog broadcast signal.

In this case, in the converting the analog broadcast signal into a digital broadcast signal, amplifying the received analog broadcast signal to convert the digital broadcast signal, and in the step of converting and transmitting the analog broadcast signal, the converted analog broadcast And amplifying and transmitting the signal.

Meanwhile, in the step of converting the digital broadcast signal into digital I / Q signals for each channel, the digital broadcast signal is low-pass filtered by applying the frequency signal and the phase signal of each channel to the digital broadcast signal. And converting the digital I / Q signal for each channel into a digital broadcast signal for each channel, wherein the frequency signal and phase signal of each channel are converted into the respective digital I / Q signals. The digital I / Q signal for each channel is converted into a digital broadcast signal for each channel by being applied to the digital I / Q signal for each channel.

In the amplifying step, the power level of the digital I / Q signal for each channel is calculated using a root mean square of the digital I / Q signal of the corresponding channel.

In one embodiment, in the amplifying step, when the power level of the digital I / Q signal for each amplified channel and the reference power level is different, the power level of the digital I / Q signal for each amplified channel and the The power factor of the digital I / Q signal for each amplified channel is corrected by reflecting the correction coefficient calculated using a reference power level to the digital I / Q signal for each amplified channel.

Meanwhile, after the amplifying step, the method may further include low pass filtering the digital I / Q signal for each amplified channel.

In the above-described embodiment, the broadcast signal includes at least one of an AM broadcast signal, an FM broadcast signal, and a DMB broadcast signal, and the digital I / Q signal for each channel is a frequency of the digital broadcast signal in a corresponding channel. It is assumed that the band is a signal directly converted to the base band.

According to the present invention, since the signals of the respective channels received at different power levels can be leveled to a predetermined power level and provided to the existing amplification device, the broadcast signal can be leveled and amplified without changing the existing amplification device. It works.

In addition, according to the present invention, since the present invention converts an analog broadcast signal received from a base station or a broadcast station into a digital broadcast signal to level the power level to a constant power level, even if the current broadcast is switched to digital broadcast, it is used without changing the configuration. There is an effect that it is possible.

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

1 is a schematic block diagram of a broadcast signal leveling apparatus according to an embodiment of the present invention. As shown, the broadcast signal leveling device 100 includes a receiving antenna 102, a first amplifier 104, an ADC 106, a first signal converter 108, a plurality of first AGC (110a ~ 110n) ), A second signal converter 112, a signal synthesizer 114, a DAC 116, a second amplifier 118, a transmit antenna 120, and a controller 122.

First, the first amplifier 104 receives an analog broadcast signal transmitted from a broadcasting station (not shown) or a base station (not shown) through the receiving antenna 102 and linearly amplifies it. The first amplifier 104 is for amplifying signals having a low power level among analog broadcast signals received from different base stations.

In one embodiment, the broadcast signal may include at least one of an AM broadcast signal, an FM broadcast signal, and a DMB broadcast signal.

Next, the ADC 106 converts the analog broadcast signal amplified by the first amplifier 104 into a digital broadcast signal. In the present invention, the reason for converting the analog broadcast signal into the digital broadcast signal using the ADC 106 is to adjust the power level of the broadcast signal for each channel as described below. It is not easy to filter the broadcast signal of the corresponding channel precisely due to the harmonic components of the broadcast signal.However, in the case of the digital broadcast signal, only the broadcast signal of the corresponding channel can be accurately filtered. Is converted into a digital broadcast signal.

Next, the first signal converter 108 converts the digital broadcast signal into a digital I / Q signal for each channel by applying a frequency signal and a phase signal of each channel to the digital broadcast signal converted by the ADC 106. do. Here, the digital I / Q signal refers to a signal in which a frequency band of the digital broadcast signal is directly converted into a base band. The present invention converts a digital broadcast signal into a digital I / Q signal for each channel. Not only the frequency signal but also the phase signal of the corresponding channel is applied, so that the digital broadcast signal can be directly converted more accurately. The configuration of the first signal converter 108 will be described in more detail with reference to FIG. 2.

As shown in FIG. 2, the first signal converter 108 includes a plurality of mixers 202a to 202n and a plurality of first LPFs 204a to 204n for each channel. First, the mixers 202a to 202n for each channel reflect the frequency signal and the phase signal of the corresponding channel to the digital broadcast signal provided from the ADC 106. At this time, the frequency signal and the phase signal of each channel are detected and provided from the analog broadcast signal amplified by the controller 122, which will be described later.

The first LPFs 204a to 204n for each channel perform low pass filtering on the signals output from the mixers 202a to 202n for each channel, and the baseband digital I / Q for each channel in the digital broadcast signal reflecting the frequency and phase signals. Isolate the signal.

Hereinafter, a method of converting a digital broadcast signal into a digital I / Q signal for each channel by the first signal converter 108 will be described as an example.

First, assuming that the digital broadcast signal provided from the ADC 106 is as described in Equation 1 below, when such a digital broadcast signal passes through the mixers 202a to 202n, that is, the mixers 202a to 202n are used. When the frequency signal and the phase signal of each channel are applied to the corresponding digital broadcast signal, the corresponding digital broadcast signal may be represented by Equation 2 below, wherein the I and Q values of the corresponding digital broadcast signal are represented by Equation 3 below. Can be Subsequently, if the low pass filtering of the digital broadcast signal reflecting the frequency signal and the phase signal of each channel through the first LPF 204a to 204n, the digital I / Q signal for each channel can be obtained as described above.

In FIG. 2 described above, although the first signal converter 108 includes first LPFs 204a to 204n for each channel, this is only an example and the first signal in the modified embodiment. The converter 108 may include only mixers 202a to 202n for each channel, and the first LPFs 204a to 204n for each channel may be configured separately from the first signal converter 108.

Referring back to FIG. 1, a plurality of AGCs (Auto Gain Controlling) 110a to 110n serve to amplify the power level of the digital I / Q signal for each channel to a reference power level through automatic gain control.

Specifically, the AGC 110a to 110n for each channel calculates the power level of the digital I / Q signal for each channel, and is provided from the calculated power level of the digital I / Q signal for each channel and the controller 122 to be described later. By comparing the reference power level, the power level of the digital I / Q signal for each channel is amplified by the difference.

As described above, the present invention can individually control the power level of the digital I / Q signal for each channel through the AGC (110a ~ 110n) provided for each channel to uniform digital I / Q signals having different power levels You can have one power level.

In this case, the power level of the digital I / Q signal for each channel may be calculated by the control unit 122, which will be described later, using the root mean square of the digital I / Q signal.

Next, the second signal converter 112 applies the baseband digital signal by applying a frequency signal and a phase signal of the corresponding channel to the amplified digital I / Q signals for each channel provided from the AGCs 110a to 110n for each channel. Converts I / Q signals to digital broadcast signals in the original band. In this case, the frequency signal and the phase signal of the corresponding channel applied to the digital I / Q signal for each amplified channel are detected and provided by the controller 122 as in the first signal converter 108 described above.

As illustrated in FIG. 3, the second signal converter 112 includes a plurality of mixers 302a to 302n provided for each channel, and the mixers 302a to 302n include AGCs 110a to 110n for each channel. By applying the frequency signal and the phase signal of the corresponding channel provided from the control unit 122 to be described later to the digital I / Q signal for each channel provided by the () to the original band of the digital I / Q signal of each channel in the baseband Converts to digital broadcast signal of each channel at.

In the above-described embodiment, the first signal converter 108 and the second signal converter 112 have been described as separate components. However, in the modified embodiment, the first signal converter 108 is used for each channel. The first signal converter 108 and the second signal converter 112 are included because the mixers 202a to 202n and the second signal converter 112 also include mixers 302a to 302n for each channel. It may be configured as a module. According to this embodiment, it is preferable that the plurality of first LPFs 204a to 204n included in the first signal conversion unit 108 are configured as modules.

Meanwhile, in the above-described embodiment, it has been described that the digital I / Q signal for each channel amplified from the AGCs 110a to 110n for each channel is directly provided to the second signal conversion unit 112. In an example, the broadcast signal leveling device 100 further includes a plurality of second LPFs (not shown) for low pass filtering the amplified digital I / Q signals for each channel output from the AGCs 110a to 110n for each channel. By removing the noise from the digital I / Q signal for each amplified channel can be provided to the second signal converter 112 is a noise-free refined signal.

As such, since the second signal converter 112 also applies both the frequency signal and the phase signal to the digital I / Q signal, it is possible to convert the digital I / Q signal into a digital broadcast signal more accurately.

Referring back to FIG. 1, the signal synthesizing unit 114 synthesizes all digital broadcasting signals of each channel in the original band provided from the second signal converting unit 112 so that the digital broadcasting signals of each channel are in a single channel. Position them in different frequency bands.

In the present invention, since the digital I / Q signal of each channel in the baseband is converted to the digital I / Q signal of each channel in the baseband, then the power level of the digital I / Q signal of each channel is adjusted. After recovering the signal to the original band, broadcast signals of each channel should be synthesized.

Next, the DAC 116 is synthesized by the signal synthesizer 114 and converts the digital broadcast signal included in one channel into an analog broadcast signal, and the second amplifier 118 is converted by the DAC 116. The analog broadcast signal is linearly amplified at a high power level for actual use and transmitted through the transmission antenna 120.

Next, the control unit 122 detects the frequency signal and the phase signal of each channel from the analog broadcast signal amplified by the above-described first amplifying unit 104, and describes the detected frequency signal and phase signal of each channel. The first signal converter 108 and the second time signal converter 112 are provided.

In addition, the controller 122 sets the reference power level and provides the AGC 110a to 110n for each channel, and calculates the power level of the digital I / Q signal for each channel to calculate the AGC 110a for each channel. ~ 110n). In this case, the controller 122 may calculate the power level of the digital I / Q signal for each channel by using the root mean square of the digital I / Q signal for each channel.

In one embodiment, the control unit 122, if the power level of the analog broadcast signal output from the DAC 116 is not uniform or uniform, but not equal to the reference power level, the analog broadcast signal output from the DAC 116 The feedback information may be generated to make the power level equal to or equal to the reference power level, and may be provided to the above-described AGC 110a to 110n for each channel. Through this, the power level of subsequent digital I / Q signals input to AGCs 110a to 110n for each channel can be made uniform or equal to the reference power level.

In another embodiment, the controller 122 compares the power level of the digital I / Q signal for each channel amplified by the AGCs 110a to 110n for each channel and the reference power level, and compares the digital I / Q signal for each channel. If it is determined that the power level of the / Q signal is different from the reference power level, the correction coefficient is calculated using the power level and the reference power level of the digital I / Q signal for each amplified channel, and the calculated correction coefficient is amplified. By reflecting the digital I / Q signal for each channel, the power level of the digital I / Q signal for each amplified channel may be corrected.

Hereinafter, referring to FIG. 4, a leveling method of a broadcast signal according to the present invention will be described.

4 is a flowchart illustrating a leveling method of a broadcast signal according to an embodiment of the present invention. As shown, when an analog broadcast signal is received through the reception antenna (S400), the received analog broadcast signal is linearly amplified in order to amplify the broadcast signal having a low power level from the received analog broadcast signals (S410).

Next, the amplified analog broadcast signal is converted into a digital broadcast signal (S420). In the present invention, the reason for converting an analog broadcast signal into a digital broadcast signal is that, as described above, in individually adjusting the power level of the broadcast signal for each channel, in the case of the analog broadcast signal, it is possible to accurately filter the broadcast signal of the corresponding channel. Although it is not easy, in case of digital broadcasting signal, only broadcasting signal of corresponding channel can be filtered out accurately.

Next, the digital broadcast signal is converted into a digital I / Q signal for each channel by applying a frequency signal and a phase signal of each channel to the digital broadcast signal (S430). That is, the digital broadcast signal of RF is directly converted into baseband digital I / Q signals for each channel. In this case, the present invention converts the digital broadcast signal into digital I / Q signals for each channel by applying not only the frequency signal of the corresponding channel but also the phase signal of the corresponding channel, so that the digital broadcast signal can be directly and directly converted.

Specifically, first, by converting the digital broadcast signal of each channel into a baseband signal by reflecting the frequency signal and the phase signal of the corresponding channel to the digital broadcast signal, and then the low pass filtering of the converted signal to digital for each channel Acquire an I / Q signal.

In this case, the frequency signal and the phase signal of each channel applied to the digital broadcast signal may be detected from the analog broadcast signal amplified in S410. To this end, the broadcast signal leveling method according to the present invention may further include a step (not shown) of detecting a frequency signal and a phase signal of each channel from the amplified analog broadcast signal.

Next, the power level of the digital I / Q signal for each channel is amplified to the reference power level through the automatic gain control (S440). Specifically, the power level of the digital I / Q signal for each channel is calculated, and the digital I / Q signal for each channel is compared by the difference by comparing the calculated power level of the digital I / Q signal for each channel with a predetermined reference power level. Boosts the power level. Through this, the power level of the digital I / Q signal for each channel can be individually controlled, so that digital I / Q signals having different power levels can have a uniform power level.

In one embodiment, the power level of each digital I / Q signal for each channel may be calculated using the root mean square of the corresponding digital I / Q signal. To this end, the broadcast signal leveling method according to the present invention may further include calculating a power level of each digital I / Q signal for each channel (not shown).

Next, by applying the frequency signal and the phase signal of the corresponding channel to the digital I / Q signal for each channel amplified by the automatic gain control, the digital I / Q signal for each channel amplified in the baseband in each original band It converts the digital broadcast signal for each channel (S450). In this case, the frequency signal and the phase signal of the corresponding channel applied to the digital I / Q signal for each amplified channel may be detected from the analog broadcast signal amplified in S410 as described above.

As described above, since the present invention applies both the frequency signal and the phase signal to the digital I / Q signal, the digital I / Q signal can be converted into the digital broadcast signal more accurately.

In the above-described embodiment, the digital I / Q signal for each channel amplified by the automatic gain control is described as being converted into a digital broadcast signal for each channel. However, in the modified embodiment, each channel amplified through the automatic gain control is described. Low pass filtering of the star digital I / Q signal may remove the noise to convert the noise-free refined signal into a digital broadcast signal. To this end, the broadcast signal leveling method according to the present invention may further include a low pass filtering of the digital I / Q signal for each channel.

Next, in order to ensure that the digital broadcast signals for each channel are located in different frequency bands within a single channel, all digital broadcast signals for each channel in the original band are synthesized (S460). In the present invention, since the digital I / Q signal of each channel in the baseband is converted to the digital I / Q signal of each channel in the baseband, then the power level of the digital I / Q signal of each channel is adjusted. After recovering the signal to the original band, broadcast signals of each channel should be synthesized.

Next, the digital broadcast signal included in one channel is converted into an analog broadcast signal (S470), and the linearly amplified at a high power level for actual use of the converted analog broadcast signal is transmitted through a transmission antenna (S480).

On the other hand, although not described in the above embodiment, when the power level of the analog broadcast signal converted in S470 is not uniform or uniform but not equal to the reference power level, the power level of the analog broadcast signal is made uniform or the reference power level. The method may further include generating feedback information to be equal to. Through this, the power level of the digital I / Q signal to be amplified in S440 may be uniform or may be equal to the reference power level.

In another embodiment, the power level of the digital I / Q signal for each channel amplified is different from the reference power level by comparing the power level of the digital I / Q signal for each channel amplified in S440 with the reference power level. When it is determined, a correction coefficient is calculated by using the power level and reference power level of each digital amplified digital I / Q signal, and the calculated amplification factor is reflected in the digital amplified digital I / Q signal for each amplified channel. The method may further include calibrating the power level of the digital I / Q signal for each channel.

As shown in FIG. 5, the broadcast signal leveling device 100 is included in the broadcast device 500 for transmitting a broadcast signal in an existing tunnel and is associated with an existing amplification device 510 installed in the tunnel. As a result, the broadcast signal can be efficiently transmitted even in the tunnel, or as shown in FIG. 6, the broadcast signal can be efficiently transmitted even in the basement of the building by being connected to an amplifier 610 installed on the roof of the building and installed in the basement of the building. can do.

On the other hand, in addition to the broadcast signal leveling device according to the present invention may be installed in an area difficult to transmit the broadcast signal, such as mountainous areas or underground railway stations may be used to efficiently transmit the broadcast signal.

The above-described broadcast signal leveling method is implemented in the form of program instructions that can be executed by computer means composed of various CPUs, RAMs and ROMs, storage devices, and the like, and can be recorded in a computer-readable recording medium. In this case, the computer-readable recording medium may include program instructions, data files, data structures, and the like, alone or in combination. On the other hand, the program instructions recorded on the recording medium may be those specially designed and configured for the present invention or may be available to those skilled in the art of computer software.

The computer-readable recording medium includes a magnetic recording medium such as a magnetic medium such as a hard disk, a floppy disk and a magnetic tape, an optical medium such as a CD-ROM and a DVD, a magnetic disk such as a floppy disk, A magneto-optical media, and a hardware device specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. The recording medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, or the like.

In addition, program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

On the other hand, those skilled in the art will understand that the present invention described above can be implemented in other specific forms without changing the technical spirit or essential features.

Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

1 is a block diagram showing a schematic configuration of a broadcast signal leveling apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating an example of a configuration of a first signal converter illustrated in FIG. 1.

3 is a block diagram illustrating an example of a configuration of a second signal converter illustrated in FIG. 1.

4 is a flowchart showing a broadcast signal leveling method according to an embodiment of the present invention.

5 is a diagram illustrating an example in which the broadcast signal leveling device shown in FIG. 1 is included in a broadcast device for transmitting a broadcast signal in an existing tunnel.

6 is a view showing an example in which the broadcast signal leveling device shown in Figure 1 is installed on the roof of a building.

Claims (19)

An ADC for converting an analog broadcast signal received through a receiving antenna into a digital broadcast signal; A first signal converter converting the digital broadcast signal into a digital I / Q signal for each channel by using a frequency signal and a phase signal of each channel; A plurality of AGCs for amplifying the power level of the digital I / Q signal for each channel to a reference power level through automatic gain control; A second signal converter for converting the amplified digital I / Q signal for each channel into a digital broadcast signal for each channel using the frequency signal and the phase signal of each channel; A signal synthesizer for synthesizing the digital broadcast signal for each channel; A DAC for converting the synthesized digital broadcast signal into an analog broadcast signal; And A control unit for detecting a frequency signal and a phase signal of each channel from the analog broadcast signal and calculating a power level of the digital I / Q signal for each channel; If the power level of the digital I / Q signal for each amplified channel is different from the reference power level, the controller corrects the power level of the digital I / Q signal for each amplified channel and the reference power level. And calculating a coefficient and applying the calculated correction coefficient to the amplified digital I / Q signal for each channel to correct the power level of the digital I / Q signal for each channel. The method of claim 1, A first amplifier amplifying the analog broadcast signal received through the reception antenna and providing the amplified signal to the ADC; And And a second amplifier for amplifying the analog signal provided from the DAC and providing the amplified analog signal to a transmitting antenna. The method of claim 1, And the control unit calculates a power level of the digital I / Q signal for each channel by using a root mean square of the digital I / Q signal for each channel. delete The method of claim 1, wherein the first signal converter, A plurality of mixers respectively applying frequency signals and phase signals of the respective channels to the digital broadcast signals; And And a plurality of first LPFs for outputting digital I / Q signals for each channel by low pass filtering the signals output from the mixer. The method of claim 1, And a plurality of second LPFs for low-pass filtering the amplified digital I / Q signals for each channel and providing them to the second signal converter. The method of claim 1, If the power level of the analog broadcast signal output from the DAC is not different or uniform from the reference power level, the controller equalizes or equalizes the power level of the analog broadcast signal output from the DAC to the reference power level. The broadcast signal leveling device, characterized in that for generating feedback information to provide to the AGC. The method of claim 1, And the first signal converter and the second signal converter comprise one module. Converting the digital broadcast signal into a digital I / Q signal for each channel; Amplifying the power level of the digital I / Q signal for each channel to a reference power level through auto gain control; Converting the amplified digital I / Q signal for each channel into a digital broadcast signal for each channel; And Synthesizing the converted digital broadcasting signal for each channel; In the amplifying step, when the power level of the digital I / Q signal for each amplified channel and the reference power level are different, the power level of the digital I / Q signal for each amplified channel and the reference power level are used. And calculating the power level of the amplified digital I / Q signals by reflecting the calculated correction coefficients to the amplified digital I / Q signals. 10. The method of claim 9, Receiving and converting the analog broadcast signal to the digital broadcast signal before the digital I / Q signal conversion step for each channel, And after the synthesizing of the digital broadcast signal for each channel, converting the synthesized digital broadcast signal into an analog broadcast signal and transmitting the analog broadcast signal. The method of claim 10, Converting the analog broadcast signal into a digital broadcast signal, amplifying the received analog broadcast signal to convert the digital broadcast signal, And converting and transmitting the analog broadcast signal, and amplifying and transmitting the converted analog broadcast signal. The method of claim 9, wherein converting the digital broadcast signal into a digital I / Q signal for each channel, And applying the frequency signal and the phase signal of each channel to the digital broadcast signal to perform low pass filtering to convert the digital broadcast signal into a digital I / Q signal for each channel. The method of claim 9, wherein converting the digital I / Q signal for each channel into a digital broadcast signal for each channel, Broadcast signal leveling method characterized by converting the digital I / Q signal for each channel into a digital broadcast signal for each channel by applying the frequency signal and the phase signal of each channel to the digital I / Q signal for each channel. . The method of claim 9, wherein in the amplification step, And a power level of the digital I / Q signal of each channel is calculated using a root mean square of the digital I / Q signal of the corresponding channel. delete The method of claim 9, wherein after the amplifying step, And low pass filtering the amplified digital I / Q signals for each channel. 10. The method of claim 9, And the broadcast signal comprises at least one of an AM broadcast signal, an FM broadcast signal, and a DMB broadcast signal. 10. The method of claim 9, And the digital I / Q signal for each channel is a signal in which a frequency band of the digital broadcast signal in a corresponding channel is directly converted into a base band. 19. A computer-readable recording medium having recorded thereon the method according to any one of claims 9-14 and 16-18.

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