KR100941886B1 - Amplifier for satellite master antenna television - Google Patents

Amplifier for satellite master antenna television Download PDF

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Publication number
KR100941886B1
KR100941886B1 KR1020090043102A KR20090043102A KR100941886B1 KR 100941886 B1 KR100941886 B1 KR 100941886B1 KR 1020090043102 A KR1020090043102 A KR 1020090043102A KR 20090043102 A KR20090043102 A KR 20090043102A KR 100941886 B1 KR100941886 B1 KR 100941886B1
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KR
South Korea
Prior art keywords
signal
sat
amplifier
rf
matv
Prior art date
Application number
KR1020090043102A
Other languages
Korean (ko)
Inventor
이웅희
Original Assignee
(주)청화테크
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by (주)청화테크 filed Critical (주)청화테크
Priority to KR1020090043102A priority Critical patent/KR100941886B1/en
Application granted granted Critical
Publication of KR100941886B1 publication Critical patent/KR100941886B1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H20/00Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/61Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast
    • H04H20/63Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast to plural spots in a confined site, e.g. MATV [Master Antenna Television]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/002Special television systems not provided for by H04N7/007 - H04N7/18
    • H04N7/005Special television systems not provided for by H04N7/007 - H04N7/18 using at least one opto-electrical conversion device
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/10Adaptations for transmission by electrical cable
    • H04N7/102Circuits therefor, e.g. noise reducers, equalisers, amplifiers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/20Adaptations for transmission via a GHz frequency band, e.g. via satellite
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/22Adaptations for optical transmission

Abstract

PURPOSE: An amplifier for amplifying an optical signal transmitted though an optical cable is provided to realize terrestrial or satellite broadcastings through the optical cable by amplifying or changing the optical signal transmitted though the optical cable to an RF signal. CONSTITUTION: A photoelectric conversion receiving module(120) changes an optical signal inputted through an optical cable connected to the first drop terminal(110) to an RF(Radio Frequency) signal. A band divider(130) divides the RF signal into a MATV(Master Antenna TV) signal a SAT(Satellite) signal. The first amplifying module(140) amplifies the MATV signal. The second amplifying module(150) amplifies the SAT signal. The band combiner(160) combines the MATV signal and the SAT signal and restores to the RF signal. An RF output test terminal(180) measures an output level of the RF signal.

Description

SMAM TV Amplifier AMPLIFIER FOR SATELLITE MASTER ANTENNA TELEVISION

The present invention relates to a SMATV amplifier, comprising a photoelectric conversion receiving module in the SMATV amplifier, and further comprising an inlet terminal for connecting the RF cable in addition to the inlet terminal for the optical cable, an optical signal or RF transmitted through the optical cable The present invention relates to a SMATV amplifier capable of watching terrestrial or satellite broadcasting by selectively amplifying an electrical RF high frequency signal transmitted through a cable.

In general, the satellite master antenna television (SMATV) method receives satellite broadcasts through a common antenna and uses them in public areas (eg, apartments, hotels, hospitals, etc.). The way to distribute.

In this manner, a SMATV amplifier is required to amplify the electrical RF high-frequency signal input through the RF cable to provide a high quality screen by compensating for the down loss to indoor transmission paths such as apartments, hotels, hospitals.

On the other hand, in recent years, there are a lot of areas where the optical cable is installed, and there is a problem that the optical signal transmitted through the optical cable is not amplified by the SMATV using the existing RF cable. Also, depending on the region, only one of the RF cable and the optical cable may be installed, and thus there is no amplifier capable of accommodating and amplifying both.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a SMATV amplifier for converting and amplifying an optical signal transmitted through an optical cable into an electrical high frequency RF signal.

In addition, another object of the present invention is to provide a SMATV amplifier that can be applied anywhere in the region where only the RF cable is contained or the optical cable is installed.

In order to achieve the above object, the SMATV amplifier according to the present invention uses a first RF input terminal 110 for connecting an optical cable and an optical signal input through an optical cable connected to the first input terminal 110. Photoelectric conversion receiving module 120 for converting and outputting the signal, and RF high-frequency signal output from the photoelectric conversion receiving module 120 is separated into the MATV signal of the terrestrial frequency band and the SAT signal of the satellite intermediate frequency band to output the band separator 130, a first amplification module 140 for amplifying and outputting the MATV signal separated and output from the band separator 130, and a second amplification module for amplifying and outputting the SAT signal separated and output from the band separator 130. 150 and a band combiner 160 which combines the MATV signal amplified by the first amplification module 140 and the SAT signal amplified by the second amplification module 150 and restores the RF signal to output an RF high frequency signal. Characterized by including It shall be.

The SMATV amplifier further includes a second lead terminal 210 for connecting an RF cable, and the RF high frequency signal input through the RF cable connected to the second lead terminal 210 is directly transmitted to the band separator 130. It is characterized in that the output.

In addition, the first amplification module 140, the high-pass filter 141 for high-frequency filtering the MATV signal output from the band separator 130, and the first gain control for adjusting the gain of the high-frequency filtered MATV signal And a circuit 142, a first tilt control circuit 143 for adjusting the inclination of the gain-adjusted MATV signal, and a MATV amplifier 144 for amplifying the inclination-adjusted MATV signal. .

In addition, the second amplification module 150, the second gain control circuit 153 for adjusting the gain of the SAT signal output from the band separator 130, and for adjusting the slope of the gain-adjusted SAT signal And a second SAT amplifying circuit 155 and a SAT amplifying unit 156 for amplifying the SAT signal whose tilt is adjusted.

In addition, the second amplification module 150 has a SAT amplifier 152 for amplifying the SAT signal input to the second gain control circuit 153, in order to prevent over-input to the SAT amplifier 152. Attenuator 151 is further provided at an input of the SAT amplifier 152.

In addition, the SAT amplifying unit 156 is characterized in that composed of two stage amplifier connected in series.

In addition, the SMATV amplifier, characterized in that it further comprises an RF output test terminal 180 for measuring the output level of the RF high-frequency signal output from the band combiner 160.

According to the present invention, by providing a photoelectric conversion receiving module in the SMATV amplifier, it is possible to amplify by converting the optical signal transmitted through the optical cable into an electrical high-frequency RF signal, through which the terrestrial or satellite broadcasting viewing through the optical cable It is possible.

In addition, considering the characteristics of the region, in addition to the inlet terminal for the optical cable in addition to the inlet terminal for connecting the RF cable, the electrical RF high-frequency signal transmitted through the RF cable is a direct band separator without going through the photoelectric conversion receiving module It can be applied in any area where only RF cable is inserted or where an optical cable is installed.

1 is a block diagram of a SMATV amplifier 100 according to an embodiment of the present invention, the inlet terminal 110, the photoelectric conversion receiving module 120, the band separator 130, the first amplification module 140, the second Amplification module 150, the band combiner 160, and output terminals (170, 180) is made.

Referring to FIG. 1, an optical cable is connected to the first lead terminal 110, and an optical signal transmitted through the optical cable is output to the photoelectric conversion receiving module 120.

The photoelectric conversion receiving module 120 converts an optical signal input through an optical cable connected to the first inlet terminal 110 into an electrical RF high frequency signal and outputs it to the band separator 130.

The band separator 130 transmits an RF high frequency signal received from the photoelectric conversion receiving module 120 to a master antenna TV (MATV) signal of a terrestrial frequency band (54 to 806 MHz) and a SAT (SATellite) of a satellite intermediate frequency band (950 to 2150 MHz). The MATV signal is output to the first amplification module 140 and the SAT signal is output to the second amplification module 150.

Meanwhile, the first amplification module 140 amplifies and outputs the MATV signal received from the band separator 130 at a predetermined amplification rate. Hereinafter, the first amplification module 140 will be described in detail. The first amplification module 140 includes a high pass filter 141, a first gain control circuit 142, a first gradient control circuit 143, and a MATV amplifier 144.

The high pass filter 141 of the first amplification module 140 removes unnecessary signals below 54 MHz in the terrestrial frequency band by high frequency filtering the MATV signal output from the band separator 130. Thereafter, the high frequency filtered MATV signal is output to the first gain control circuit 142.

The first gain control circuit 142 of the first amplification module 140 adjusts the gain of the high frequency filtered MATV signal received from the high pass filter 141 to constantly adjust the output level of the terrestrial frequency band. The gain-adjusted MATV signal is output to the first tilt control circuit 143.

The first inclination adjustment circuit 143 of the first amplification module 140 adjusts the inclination of the gain-controlled MATV signal received from the first gain adjustment circuit 142. The inclination-adjusted MATV signal is output to the MATV amplifier 144.

The MATV amplifier 144 of the first amplification module 140 amplifies the inclination-adjusted MATV signal received from the first gradient control circuit 143 at a predetermined amplification rate, and amplifies the amplified MATV signal in the band combiner 160. Will output

Meanwhile, the second amplification module 150 amplifies and outputs the SAT signal received from the band separator 130 at a predetermined amplification rate. Hereinafter, the second amplification module 150 will be described in detail. The second amplification module 150 includes an attenuator 151, a second gain control circuit 153, a second tilt control circuit 155, and a plurality of SAT amplifiers 152, 154, and 156.

The attenuator 151 of the second amplification module 150 appropriately attenuates the SAT signal received from the band separator 130 to prevent over input to the SAT amplifier 152. The appropriately attenuated SAT signal is output to the SAT amplifier 152.

The SAT amplifier 152 of the second amplification module 150 is a first stage amplifier of the satellite band, and amplifies the SAT signal transmitted from the attenuator 151 at an appropriate amplification rate. The amplified SAT signal is transmitted to the second gain control circuit 153.

The second gain control circuit 153 of the second amplification module 150 properly adjusts the gain of the amplified SAT signal received from the SAT amplifier 152, thereby constantly adjusting the output level of the satellite frequency band. The gain-adjusted SAT signal is output to the SAT amplifier 154.

The SAT amplifier 154 is a two-stage amplifier in the satellite band and amplifies the SAT signal transmitted from the second gain control circuit 153 at an appropriate amplification rate. The amplified SAT signal is output to the second tilt control circuit 155.

The second tilt control circuit 155 of the second amplification module 150 adjusts the slope of the SAT signal received from the SAT amplifier 154. The SAT signal whose slope is adjusted is amplified through the SAT amplifier 156 and finally output to the band combiner 160. As illustrated in FIG. 1, the SAT amplifying unit 156 includes two stages of amplifiers 150a and 156b connected in series.

Meanwhile, the band combiner 160 combines the amplified MATV signal received from the first amplification module 140 and the amplified SAT signal transmitted from the second amplification module 150 to restore an RF high frequency signal to the RF output terminal ( 170). The output RF high frequency signal is output through the TV via the terminal box and the SET-UP box, so that viewers can watch terrestrial or satellite broadcasting.

On the other hand, the output terminal may be further provided with a separate RF output test terminal 180 to indirectly measure the output level of the RF high-frequency signal of the RF output terminal 170. The components shown in FIG. 1 may be powered by a single power supply, and thus may use a switching mode power supply (SMPS) used in an existing SMATV amplifier.

2 is a diagram illustrating a configuration of the SMATV amplifier 200 according to another exemplary embodiment of the present invention, except that an additional second lead terminal 210 is additionally provided, the operation of each component is shown in FIG. 1. Same as described in

Referring to FIG. 2, an RF cable is connected to the second lead terminal 210, and the RF high frequency signal transmitted through the RF cable is directly transmitted to the band separator 130 without passing through the photoelectric conversion receiving module 120. . The band separator 130 separates the RF high-frequency signal received through the second inlet terminal 210 into a terrestrial frequency band MATV signal and a satellite intermediate frequency band SAT signal, respectively, the first amplification module 140 and the second amplification. Transfer to the module 150, the subsequent signal conversion process is as described in FIG. This will allow terrestrial and satellite broadcasts to be viewed over existing RF cables even in areas where optical cables are not installed.

The invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

The best embodiments have been disclosed in the drawings and specification above. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a block diagram of a SMATV amplifier according to an embodiment of the present invention.

2 is a block diagram of a SMATV amplifier according to another embodiment of the present invention.

Claims (7)

  1. A first lead terminal 110 for connecting an optical cable;
    A second lead terminal 210 for connecting an RF cable;
    A photoelectric conversion receiving module 120 for converting and outputting an optical signal input through an optical cable connected to the first inlet terminal 110 into an electrical RF high frequency signal;
    A band separator 130 for separating and outputting the RF high frequency signal output from the photoelectric conversion receiving module 120 into a MATV signal of a terrestrial frequency band and a SAT signal of a satellite intermediate frequency band;
    A first amplification module 140 for amplifying and outputting the MATV signal separated and output from the band separator 130;
    A second amplification module 150 for amplifying and outputting the SAT signal separated and output from the band separator 130;
    A band combiner 160 for combining the MATV signal amplified by the first amplification module 140 and the SAT signal amplified by the second amplification module 150 and restoring the RF signal to an RF high frequency signal; And
    It includes an RF output test terminal 180 for measuring the output level of the RF high-frequency signal output from the band combiner 160,
    SMATV amplifier, characterized in that the RF high-frequency signal input through the RF cable connected to the second lead terminal 210 is output directly to the band separator (130).
  2. delete
  3. The method of claim 1,
    The first amplification module 140,
    A high pass filter 141 for high frequency filtering the MATV signal output from the band separator 130;
    A first gain control circuit 142 for adjusting the gain of the high frequency filtered MATV signal;
    A first inclination adjustment circuit 143 for adjusting inclination of the gain-adjusted MATV signal; And
    SMATV amplifier, characterized in that it comprises a MATV amplifier (144) for amplifying the tilted MATV signal.
  4. The method of claim 1,
    The second amplification module 150,
    A second gain control circuit 153 for adjusting the gain of the SAT signal output from the band separator 130;
    A second inclination adjustment circuit 155 for adjusting the inclination of the gain-adjusted SAT signal; And
    And a SAT amplifying unit (156) for amplifying the inclined SAT signal.
  5. The method of claim 4, wherein
    The second amplification module 150,
    A SAT amplifier 152 for amplifying the SAT signal input to the second gain control circuit 153, attenuator at the input terminal of the SAT amplifier 152 to prevent over-input to the SAT amplifier 152 A SMATV amplifier, characterized by having (151).
  6. The method of claim 5,
    The SAT amplification unit 156,
    SMATV amplifier characterized by consisting of two stage amplifier connected in series.
  7. delete
KR1020090043102A 2009-05-18 2009-05-18 Amplifier for satellite master antenna television KR100941886B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090043102A KR100941886B1 (en) 2009-05-18 2009-05-18 Amplifier for satellite master antenna television

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090043102A KR100941886B1 (en) 2009-05-18 2009-05-18 Amplifier for satellite master antenna television

Publications (1)

Publication Number Publication Date
KR100941886B1 true KR100941886B1 (en) 2010-02-16

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Application Number Title Priority Date Filing Date
KR1020090043102A KR100941886B1 (en) 2009-05-18 2009-05-18 Amplifier for satellite master antenna television

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050078044A (en) * 2004-01-30 2005-08-04 삼성전자주식회사 Ftth system based on passive optical network for broadcasting service
KR20060067415A (en) * 2004-12-15 2006-06-20 삼성전자주식회사 Apparatus and method for conrtolling a gain of optical receiver in a optical communication system
KR20060069042A (en) * 2004-12-17 2006-06-21 (주)호서텔레콤 Data communication apparatus using optical wave switch

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050078044A (en) * 2004-01-30 2005-08-04 삼성전자주식회사 Ftth system based on passive optical network for broadcasting service
KR20060067415A (en) * 2004-12-15 2006-06-20 삼성전자주식회사 Apparatus and method for conrtolling a gain of optical receiver in a optical communication system
KR20060069042A (en) * 2004-12-17 2006-06-21 (주)호서텔레콤 Data communication apparatus using optical wave switch

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