KR102071609B1 - Intelligent type AM relaying apparatus and method thereof - Google Patents

Abstract

The present invention relates to an intelligent AM relay device capable of actively suppressing a harmonic signal and a method thereof. According to the present invention, the intelligent AM relay device comprises a receiving antenna, an AM band filter, a low noise amplifier, a signal divider, an intelligent AM digital channel filter, a signal coupler, a high output amplifier, an AM band filter, and a transmitting antenna.

Description

Intelligent AM relay device and method thereof

The present invention relates to an intelligent AM relay device and a method thereof, and more particularly, to a relay device for relaying AM broadcasting in a radio shade area, by actively suppressing harmonic signals in a band used during AM relaying, and using a raw channel signal. The present invention relates to an intelligent AM repeater capable of preventing mixing of a harmonic signal and a method thereof.

In general, radio shade areas such as tunnels, mountainous terrain, or underground sections by high-rise buildings, such as roads or railway construction, should be provided with a broadcast relay device for the purpose of retransmission of broadcasts blocked by architectural shields.

That is, in the radio shade area as described above, in the process of receiving a plurality of broadcast channels from the receiving air line by installing a receiving antenna, due to the difference between the distance from the receiving air line to the broadcasting station transmitting station or the multiple condensation loss, each channel of the received signal A difference in field strength occurs.

Accordingly, the conventional broadcast relay device is a method of simply amplifying a carrier signal input from a receiving air line after installing a receiving antenna mostly to enable low cost and simplify the device structure.

Also, by simply amplifying without performing demodulation and demodulation in the transmission and reception process, the response characteristics of each frequency band are the same, so that any type of modulation or multiplexing method can be accommodated. The advantage is immediate response without the need for additional equipment or reconditioning of the equipment.

However, since a conventional broadcast relay device has a structure for simply amplifying and relaying a received carrier signal, in a narrow band such as AM broadcasting, harmonic signals for the original channel signal are generated in the same band during amplification relaying. There is a problem in that the harmonic signal is mixed with the raw channel signal of the corresponding band, and confusion occurs in the broadcast, and the intelligibility of the broadcast is reduced.

(Patent Document 0001) Registered Patent No. 10-1492840

(Patent Document 0002) Registered Patent No. 10-0891479

Accordingly, an object of the present invention is to provide an intelligent AM for relaying AM broadcasting in a radio shade region, which can actively suppress harmonic signals in a band used during AM relaying to prevent mixing of raw channel signals and harmonic signals. It is to provide a relay device and a method thereof.

On the other hand, the object of the present invention is not limited to the above-mentioned object, other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

To this end, according to the invention, the receiving antenna is installed in the radio shade area; An AM band filter for filtering only a broadcast channel signal of an AM band among broadcast channel signals received from a reception antenna; A low noise amplifier which removes noise among the broadcast channel signals filtered from the AM bandpass filter and amplifies the received signal to generate an amplified broadcast channel signal; A signal divider that divides the broadcast channel signal amplified by the low noise amplifier into a broadcast channel signal in which harmonics are generated and a broadcast channel signal in which harmonics are not generated, and distributes the signals to the intelligent AM digital channel filter; When a broadcast channel signal that generates harmonics is distributed from the signal splitter, the harmonic detection signal generated during amplification is fed back, and the broadcast channel signal in which the harmonic signal is suppressed through the corresponding antiphase signal is converted into an RF signal. An intelligent AM digital channel filter for outputting a predetermined size and outputting the broadcasting channel signal in a predetermined size when the broadcasting channel signal is generated from the signal distributor without harmonics; A signal combiner for generating a broadcast channel signal in which a harmonic signal output from the intelligent AM digital channel filter is suppressed and a broadcast channel signal in which harmonics are not generated as a broadcast channel signal coupled to each frequency position of an AM band; A high output amplifier for amplifying the broadcast channel signal of the AM band transmitted from the signal combiner to a high output to generate a broadcast channel signal up-harmonized with a harmonic signal; An AM band filter for filtering only a broadcast channel signal of an AM band among the broadcast channel signals amplified by the high output amplifier; And a transmission antenna for transmitting and relaying the broadcast channel signal filtered by the AM band pass filter.

The intelligent AM digital channel filter may further include a first AM digital filter for filtering only a broadcast channel signal for an AM band of a broadcast channel signal in which harmonics are generated from a signal splitter; A harmonic detector for generating a harmonic signal generated during gain control or high output amplification of the broadcast channel signal filtered by the first AM digital filter; A broadcast channel signal is converted into an RF signal by generating an anti-phase signal corresponding to the harmonic signal generated from the harmonic detector and synthesizing it with the broadcast channel signal so that the harmonic signal generated during gain control or high output amplification is suppressed by analog conversion. A harmonic eliminator for outputting a channel signal; A first gain controller for controlling the gain of the broadcast channel signal suppressed by the harmonics output from the harmonic eliminator to a set value; A second AM digital filter inputting a broadcast channel signal in which harmonics are not generated from the signal splitter; And a second gain controller which controls a gain of a broadcast channel signal in which harmonics output by the second AM digital filter is not generated to a set value.

Therefore, according to the present invention, in a relay apparatus for relaying AM broadcasting in a radio wave shading area, it is possible to actively suppress harmonic signals in a band used during AM relaying to prevent mixing of raw channel signals and harmonic signals.

On the other hand, the effects of the present invention is not limited to the effects mentioned above, other effects that are not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a configuration diagram schematically showing the configuration of an intelligent AM relay device according to a preferred embodiment of the present invention;
2 is a block diagram showing the configuration of the intelligent AM digital channel filter in the intelligent AM relay device of FIG.
3 is a detailed block diagram illustrating a configuration of removing harmonics of an intelligent AM digital channel filter in the intelligent AM relay device of FIG. 2;
FIG. 4 is a view showing waveforms of channel signals processed by respective components in the intelligent AM relay device of FIG. 1 in sequence; FIG. And
5 is a control flowchart illustrating an intelligent AM relaying method according to a preferred embodiment of the present invention.

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

First, as shown in Figures 1 to 5, the intelligent AM relay apparatus according to a preferred embodiment of the present invention, the broadcast channel signal received from the receiving antenna 10, the receiving antenna 10 is installed in the radio shade area AM band filter 20 for filtering only the broadcast channel signal B for the AM band among (A) and noise of the broadcast channel signal B filtered from the AM band filter 20 to remove noise Among the low noise amplifier 30 and the broadcast channel signal C amplified by the low noise amplifier 30 to generate an amplified broadcast channel signal C, a broadcast channel signal D and harmonics generated in the AM band are generated. The broadcast channel signal D, which generates harmonics, is divided from the signal divider 40 and the signal divider 40 respectively, which are separated into the broadcast channel signal E that is not generated and then distributed to the intelligent AM digital channel filter 100. In this case, the harmonic detection signal generated during amplification is fed back By processing the broadcast channel signal F, in which the harmonic signal is suppressed through the corresponding anti-phase signal RFB, to the broadcast channel signal G converted to the RF signal, outputting it to a predetermined size, and then outputting the signal from the signal splitter 40. When the broadcast channel signal E without harmonics is input, the harmonic signal output from the intelligent AM digital channel filter 100 and the intelligent AM digital channel filter 100 outputting the broadcast channel signal E in a predetermined size. A signal combiner 50 and a signal combiner 50 for generating a suppressed broadcast channel signal G and a broadcast channel signal E in which harmonics are not generated, as a broadcast channel signal H combined at each frequency position of an AM band. Amplified broadcast channel signal (H) of the AM band transmitted from the high output amplifier 60 to produce a broadcast channel signal (I) up-harmonized harmonic signal, the broadcast channel signal amplified by the high output amplifier ( I) Only broadcast channel signal (J) for AM band And a transmission antenna 80 for transmitting and relaying the broadcast channel signal J filtered by the AM band filter 70 and the AM band filter 70.

Receiving antenna 10 and the transmitting antenna 80, one or more are provided in the radio shade area, respectively, may be composed of a donor antenna and a remote antenna that can transmit and receive air signals and mobile communication signals.

The AM band filter 20 is a means for filtering only the broadcast channel signal B for the AM band among the broadcast channel signals A received from the reception antenna 10. Since the AM band filter 20 may have a known configuration, a detailed description thereof will be omitted. Let's do it.

The low noise amplifier 30 is a means for generating an amplified broadcast channel signal C by amplifying a magnitude of a received signal after removing noise among the broadcast channel signals B filtered from the AM bandpass filter 20. Linear amplification of the broadcast channel signal (B) to amplify a signal having a low power level, and may have a known configuration, detailed description thereof will be omitted.

The signal splitter 40 is divided into a broadcast channel signal D in which harmonics are generated in the AM band and a broadcast channel signal E in which no harmonics are generated, among the broadcast channel signals C amplified by the low noise amplifier 30. As a means for distributing to the intelligent AM digital channel filter 100, respectively, it may have a filter or a circuit configuration to separately process the frequency generating harmonics and the frequency not generating harmonics among AM bands having a narrow band.

Therefore, according to the signal splitter 40, the harmonic elimination process described below may be omitted for frequencies where harmonics are not generated in the AM band, and thus, delays may be minimized by enabling fast signal processing.

The intelligent AM digital channel filter 100 feeds back a harmonic detection signal generated during amplification when the broadcast channel signal D generating harmonics is distributed from the signal distributor 40, and corresponds to an anti-phase signal RFB corresponding thereto. The broadcasting channel signal F, which is suppressed by the harmonic signal, is processed into the broadcasting channel signal G converted to the RF signal, and then outputted in a predetermined size, and the broadcasting channel signal in which harmonics are not generated from the signal distributor 40 ( In the case where E) is input, as a means for outputting the broadcast channel signal E with a predetermined size, only the broadcast channel signal D for the AM band of the broadcast channel signal D in which harmonics are generated from the signal splitter 40 is generated. Harmonic detector for generating a harmonic signal (FB) generated during the gain control or high output amplification of the broadcast channel signal (D) filtered by the first AM digital filter 110, the first AM digital filter 110 to be filtered ( 120), to the harmonic detector 120 The harmonic signal FB corresponding to the generated harmonic signal FB and synthesized with the broadcast channel signal D to suppress the harmonic signal FB generated during gain control or high output amplification. A value obtained by setting the gain of the harmonic canceller 130 for outputting the broadcast channel signal G converted to the RF signal by performing an analog conversion process and the broadcast channel signal G for which the harmonics output from the harmonic rejector 130 are suppressed. By the first gain controller 140, the second AM digital filter 150 and the second AM digital filter 150 to which the broadcast channel signal E, from which the harmonic is not generated, from the signal distributor 40, is input. And a second gain controller 160 for controlling the gain of the broadcast channel signal E from which no harmonics are output to a set value.

The first AM digital filter 110 is a means for outputting only the broadcast channel signal D in which harmonics in the AM band are generated, and digitally outputs the broadcast channel signal D in which the harmonics input from the signal splitter 40 are generated. Only the broadcast channel signal D for the AM band is filtered out of the first A / D converter 111 for conversion processing and the broadcast channel signal D for generating harmonics digitally converted by the first A / D converter 111. DSPAM filter 112 is configured.

The harmonic detector 120 is a means for detecting and generating a harmonic signal FB of a broadcast channel signal B in which a harmonic signal is generated during gain control or high output amplification, and the original channel signal of the corresponding frequency and the n-th harmonic signal. The harmonic signal FB including the waveform of is detected.

Here, the harmonic detector 120 is a harmonic signal based on the original channel signal and the n-th harmonic signal for the signal for the broadcast channel signal (B or D) from which the harmonics output from the first gain controller 140 described later are generated. (FB) is detected.

The harmonic remover 130 is a means for outputting a broadcast channel signal F in which harmonics are suppressed based on the harmonic signal FB of the harmonic detector 120, and the harmonic signal FB detected from the harmonic detector 120. Removes the original channel signal from the digital harmonic signal DFB digitally processed by the second A / D converter 131 and the second A / D converter 131 that generates a digital harmonic signal DFB by digitally converting Harmonic reverse phase signal generator 132 for generating an n-phase harmonic signal (RFB) only, broadcast channel signal (D) from DSPAM filter 112, and antiphase from harmonic reverse phase signal generator 132 Harmonics suppressed by the DSP signal synthesizer 133 and the DSP signal synthesizer 133 which receive the signals RFB and output each other as a broadcast channel signal F in which harmonics are suppressed at the time of gain control or amplification. Converts the channel signal F into an RF signal by performing analog conversion. And a D / A converter 134 for generating the converted broadcast channel signal G.

The first gain controller 140 feeds back a signal for the harmonics of the broadcast channel signal D from which the harmonics are output from the first AM digital filter 110 to the harmonic remover 130. As a means for controlling the gain of the broadcast channel signal F suppressed by the harmonics output from the harmonic eliminator 130, the gain of the broadcast channel signal F is automatically controlled to a preset magnitude, The detailed description will be omitted since it may have a configuration.

The second AM digital filter 150 may have the same configuration as the first AM digital filter 110 as a means for outputting only the broadcast channel signal E in which harmonics in the AM band are not generated.

The second gain controller 160 is a means for controlling the gain of the broadcast channel signal E from which harmonics output from the second AM digital filter 150 is not generated. It automatically controls to a set size, and since it may have a known configuration, detailed description thereof will be omitted.

Therefore, according to the intelligent AM digital channel filter 100, a broadcast channel signal D in which harmonics are generated and a broadcast channel signal E in which no harmonics are generated are individually distributed, and then a broadcast channel signal in which harmonics are generated ( D) Suppresses the harmonic part through the anti-phase signal (RFB) to suppress or remove the harmonic part during gain control or high output amplification and outputs it as the broadcast channel signal F from which harmonics are removed. Harmonic signals generated during relaying can be actively or intelligently eliminated.

The signal combiner 50 combines the broadcast channel signal G from which the harmonic signal output from the intelligent AM digital channel filter 100 is suppressed and the broadcast channel signal E from which harmonics are not generated at each frequency position of the AM band. As a means for generating a broadcast channel signal (H), a broadcast channel signal (F) in which a harmonic signal corresponding to a low frequency is suppressed on the same time axis and a sending channel signal in which a harmonic signal corresponding to a high frequency are not generated (E) generates a broadcast channel signal (H) output at each frequency position.

Therefore, according to the signal combiner 50, the broadcast channel signal F corresponding to the low frequency where harmonics are generated among the AM bands corresponding to the narrow band and the broadcast channel signal E corresponding to the high frequency where the harmonics are not generated are the same time. The output is located on the axis.

The high output amplifier 60 is a means for causing the broadcast channel signal H coupled by the signal combiner 50 through the transmission antenna 80 to be amplified into a high output broadcast channel signal I. When the amplification of the A) outputs a broadcast channel signal (I) having only the one-channel signal suppressed by the harmonic signal, preferably, a linear amplifier having a low gain, thereby generating a harmonic signal during amplification and thus It is good practice to minimize distortion.

The AM band filter 70 is a means for filtering only the broadcast channel signal J for the AM band among the broadcast channel signals I amplified by the high output amplifier 60. Since the AM band filter 70 may have a known configuration, detailed description thereof will be omitted. Let's do it.

Hereinafter, an intelligent AM relay method according to a preferred embodiment of the present invention will be described.

First, AM channel broadcast channel signals A are received from a broadcasting station in a reception antenna 10 installed in a radio shade region (S100).

Thereafter, only the broadcast channel signal B for the AM band is filtered out of the broadcast channel signal A received from the reception antenna 10 by the AM band filter 20 (S110).

Here, the AM band is about 0.5MHz to 1.5MHz, the broadcast channel signals (B), for example, may have a frequency of 0.5MHz, 1MHz and 1.5MHz.

Thereafter, the noise of the broadcast channel signals B filtered from the AM bandpass filter 20 is removed by the low noise amplifier 30, and then the magnitude of the received signal is amplified to generate the broadcast channel signal C (S120). .

Thereafter, the broadcast channel signals C amplified by the low noise amplifier 30 by the signal splitter 40 are converted into the broadcast channel signals D in which harmonics are generated in the AM band and the broadcast channel signals E in which harmonics are not generated. After the separation is distributed to the intelligent AM digital channel filter 100 (S130).

Here, the broadcasting channel signal D, which generates harmonics in the AM band, has, for example, a frequency of 0.5 MHz, and the broadcasting channel signal E, which does not generate harmonics in the AM band, has frequencies of 1 MHz and 1.5 MHz.

Subsequently, when the broadcast channel signal D generating harmonics is distributed from the signal distributor 40 by the intelligent AM digital channel filter 100, the harmonic detection signal generated during amplification is fed back to correspond to an antiphase signal corresponding thereto ( The broadcasting channel signal F in which the harmonic signal is suppressed through the RFB is processed into the broadcasting channel signal G converted into the RF signal, and then outputted in a predetermined size, and the broadcasting channel in which harmonics are not generated from the signal distributor 40. When the signal E is input, the broadcast channel signal E is output in a predetermined size (S140).

Herein, the intelligent AM digital channel filter 100 of step S140 sets the size of the broadcast channel signal F in which harmonic signals are suppressed and the broadcast channel signal E in which harmonics are not generated to a predetermined size through the following process. Output

First, the intelligent AM digital channel filter 100 filters only the broadcast channel signal D for the AM band of the broadcast channel signal D in which harmonics are generated from the signal distributor 40 through the first AM digital filter 110. Be sure to

Here, the first AM digital filter 110 performs a digital conversion process on the broadcast channel signal D, from which the harmonics input from the signal splitter 40 is generated, via the first A / D converter 111, and the DSPAM filter 112. The first A / D converter 111 filters only the broadcast channel signal D for the AM band among the broadcast channel signals D in which harmonics digitally converted are generated.

Here, the broadcast channel signal (D) where harmonics are generated, for example, has a frequency of 0.5 MHz.

Subsequently, the intelligent AM digital channel filter 100 controls the gain of the broadcast channel signal D in which harmonics output from the first AM digital filter 110 are generated through the first gain controller 140. The harmonic detector 120 detects a harmonic signal of the broadcast channel signal D in which harmonics are generated, and generates a harmonic signal FB corresponding thereto.

Here, the harmonic signal FB has, for example, an original channel signal of 0.5 MHz, a first harmonic signal of 1 MHz, and a second harmonic signal of 1.5 MHz.

Thereafter, the intelligent AM digital channel filter 100 suppresses the harmonics of the broadcast channel signal D from which the harmonics are generated based on the harmonic signal FB generated from the harmonic detector 120 through the harmonic eliminator 130, thereby eliminating harmonics. A broadcast channel signal F to be removed is generated.

Here, the harmonic remover 130 generates a broadcast channel signal F in which harmonics are suppressed through the following process.

First, the harmonic eliminator 130 digitally converts the harmonic signal FB detected from the harmonic detector 120 through the second A / D converter 131 to generate a digital harmonic signal DFB.

Thereafter, the harmonic remover 130 removes the original channel signal among the digital harmonic signals DFB digitally processed by the second A / D converter 131 through the harmonic reverse phase signal generator 132 and then only the nth harmonic signal. Generate an anti-phase signal (RFB) for.

Here, the antiphase signal RFB includes, for example, a 1 MHz first harmonic signal and a 1.5 MHz second harmonic signal from which a frequency of 0.5 MHz, which is the original channel signal, of the harmonic signals FB is removed.

Thereafter, the harmonic rejector 130 receives the anti-phase signal RFB from the broadcast channel signal D and the harmonic reverse phase signal generator 132 where harmonics are generated from the DSPAM filter 112 through the DSP signal synthesizer 133. They are received and synthesized with each other and output as a broadcast channel signal F in which harmonics are suppressed during gain control or high output amplification.

Here, the broadcast channel signal F in which harmonics are suppressed has, for example, a frequency of 0.5 MHz corresponding to the original channel signal among the harmonic signals FB.

Thereafter, the harmonic eliminator 130 converts the harmonic-reduced broadcast channel signal F generated by the DSP signal synthesizer 133 into an analog signal through the A / A converter 134.

Thereafter, the intelligent AM digital channel filter 100 controls the gain of the harmonic-suppressed broadcast channel signal F output from the harmonic eliminator 130 through the first gain controller 140.

Meanwhile, the intelligent AM digital channel filter 100 uses only the broadcast channel signal E for the AM band of the broadcast channel signal E in which harmonics are not generated from the signal distributor 40 through the second AM digital filter 150. To be filtered.

Here, the second AM digital filter 150 may have the same configuration and operation as the first AM digital filter 110.

Thereafter, the intelligent AM digital channel filter 100 controls the gain of the broadcast channel signal E from which harmonics output from the second AM digital filter 150 are not generated through the second gain controller 150.

Here, the broadcast channel signal E, which does not generate harmonics, has, for example, frequencies of 1 MHz and 1.5 MHz.

Subsequently, the broadcast channel signal F in which the harmonic signal output from the intelligent AM digital channel filter 100 is suppressed by the signal combiner 50 and the broadcast channel signal E in which harmonics are not generated are positioned at each frequency in the AM band. It is generated as a broadcast channel signal (H) coupled to (S150).

Here, the broadcast channel signal H coupled to each frequency position of the AM band may have frequencies of 0.5 MHz, 1 MHz, and 1.5 MHz, which are equally controlled gains of the broadcast channel signal B. FIG.

Subsequently, the AM channel broadcast channel signal H transmitted from the signal combiner 50 is amplified to a high output by the high output amplifier 60. At this time, the harmonic signal is suppressed so that the broadcast channel signal I having only the original channel signal is present. Is generated (S160).

Thereafter, only the broadcast channel signal J for the AM band is filtered out of the broadcast channel signal I amplified by the high output amplifier 60 by the AM band filter 70 (S170).

Thereafter, the broadcast channel signal J filtered by the AM band filter 70 through the transmission antenna 80 is transmitted and relayed (S180).

Thus, according to the above, in the relay apparatus for relaying AM broadcast in the radio shade region, it is possible to actively suppress the harmonic signals in the use band during AM relaying to prevent mixing of the original channel signal and the harmonic signals.

In addition, by distributing the harmonic-generating channel signal and the harmonic-free channel signal separately in the intelligent AM digital channel filter in the AM band, it is possible to process the signal quickly to minimize the delay.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may be substituted or modified in various ways without departing from the spirit or essential features of the present invention. It will be appreciated that the present invention can be practiced in other specific forms, as modifications are possible. Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive.

Claims (5)

Receiving antenna 10 is installed in the radio shading area; An AM band filter 20 for filtering only the broadcast channel signal B for the AM band among the broadcast channel signals A received from the reception antenna 10; A low noise amplifier 30 for removing noise from the broadcast channel signal B filtered by the AM band filter 20 and then amplifying the received signal to generate an amplified broadcast channel signal C; Among the broadcasting channel signals C amplified by the low noise amplifier 30, the broadcasting channel signal D, which generates harmonics in the AM band, and the broadcasting channel signal E, which does not generate harmonics, are divided into intelligent AM digital channel filters ( A signal splitter 40 for distributing the signals to 100; When the broadcast channel signal D generating harmonics is distributed from the signal splitter 40, the harmonic detection signal generated during amplification is fed back and the broadcast channel signal whose harmonic signal is suppressed through the corresponding antiphase signal RFB. (F) is processed into a broadcast channel signal (G) converted to an RF signal and output to a predetermined size, and when a broadcast channel signal (E) without harmonics is input from the signal splitter 40, the broadcast channel signal. Intelligent AM digital channel filter 100 for outputting a predetermined size (E); The harmonic signal output from the intelligent AM digital channel filter 100 is suppressed as a broadcast channel signal G in which a harmonic signal is suppressed and a broadcast channel signal E in which harmonics are not generated at each frequency position in the AM band. Generating a signal combiner 50; A high output amplifier 60 for amplifying the broadcast channel signal H of the AM band transmitted from the signal combiner 50 to a high output to generate a broadcast channel signal I in which the harmonic signal is up-pressed; An AM band filter 70 for filtering only the broadcast channel signal J for the AM band among the broadcast channel signals I amplified by the high output amplifier 60; And a transmission antenna 80 for transmitting and relaying the broadcast channel signal J filtered by the AM band filter 70,
Intelligent AM digital channel filter 100,
A first AM digital filter (110) for filtering only the broadcast channel signal (D) for the AM band of the broadcast channel signal (D) in which harmonics are generated from the signal splitter (40); A harmonic detector 120 generating a harmonic signal FB generated during gain control or high output amplification of the broadcast channel signal D filtered by the first AM digital filter 110; Generate an antiphase signal RFB corresponding to the harmonic signal FB generated from the harmonic detector 120 and synthesize it with the broadcast channel signal D to suppress the harmonic signal FB generated during gain control or high output amplification. A harmonic eliminator 130 for analog-converting the broadcast channel signal F to output the broadcast channel signal G converted into an RF signal; A first gain controller 140 for controlling the gain of the broadcast channel signal G from which harmonics output from the harmonic rejector 130 is suppressed to a set value; A second AM digital filter 150 to which a broadcast channel signal E in which harmonics are not generated is input from the signal splitter 40; And a second gain controller (160) for controlling the gain of the broadcast channel signal (E) from which harmonics output by the second AM digital filter (150) is not generated to a set value. delete The method of claim 1, wherein the first AM digital filter 110,
A first A / D converter 111 for digitally converting the broadcast channel signal D from which harmonics input from the signal splitter 40 are generated;
The first A / D converter 111 is characterized in that it consists of a DSPAM filter 112 to filter only the broadcast channel signal (D) for the AM band of the broadcast channel signal (D) is generated digitally converted harmonics Intelligent AM Repeater. The harmonic detector 120 of claim 3, wherein
Intelligent AM relay, characterized in that to detect the harmonic signal (FB) on the basis of the original channel signal and the n-th harmonic signal for the signal for the broadcast channel signal (D), the harmonic output from the first gain controller 140 Device. The method of claim 4, wherein the harmonic rejector 130,
A second A / D converter 131 for digitally converting the harmonic signal FB detected from the harmonic detector 120 to generate a digital harmonic signal DFB;
Harmonic reverse phase signal generator 132 which generates an antiphase signal (RFB) for only the nth harmonic signal after removing the original channel signal from the digital harmonic signals DFB digitally processed by the second A / D converter 131. );
The broadcast channel signal F receives the broadcast channel signal D from the DSPAM filter 112 and the anti-phase signal RFB from the harmonic reverse phase signal generator 132 and synthesizes each other to suppress harmonics during gain control or amplification. DSP signal synthesizer 133 to output to the; And
And a D / A converter 134 for generating a broadcast channel signal G converted into an RF signal by analog converting the broadcast channel signal F suppressed by the harmonics generated by the DSP signal synthesizer 133. Intelligent AM repeater characterized by.

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