KR20140065131A - A single/multi-channel modulating apparatus having multi-modulator - Google Patents

A single/multi-channel modulating apparatus having multi-modulator Download PDF

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Publication number
KR20140065131A
KR20140065131A KR1020120132285A KR20120132285A KR20140065131A KR 20140065131 A KR20140065131 A KR 20140065131A KR 1020120132285 A KR1020120132285 A KR 1020120132285A KR 20120132285 A KR20120132285 A KR 20120132285A KR 20140065131 A KR20140065131 A KR 20140065131A
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KR
South Korea
Prior art keywords
modulation
channel
unit
modulator
complex
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KR1020120132285A
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Korean (ko)
Inventor
배재석
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(주)호서텔레콤
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Priority to KR1020120132285A priority Critical patent/KR20140065131A/en
Publication of KR20140065131A publication Critical patent/KR20140065131A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/16—Aspects of broadcast communication characterised by the type of broadcast system digital video broadcasting - handhelds [DVB-H]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

The present invention relates to a single-channel or multi-channel modulating device having a composite modulating unit, capable of outputting broadcast signals of various modulation manners by a single board. The single-channel or multi-channel modulating device having a composite modulating unit, which is integrated in a single FPGA, comprises a first converting unit to convert a channel-based ASI input signal included in a single channel or multi-channels to an MPEG-TS signal to be outputted; a second converting unit to convert the output signal in the first converting unit at a certain channel-based bit rate; a modulating unit to modulate and output the output signal in the second converting unit by each channel; and an output unit to output the output signal in the modulating unit by a channel-based RF DAC connected to the rear end. The modulating unit is replaced with a composite modulating unit including a modulator which uses at least two or more modulation manners, and the composite modulating unit determines the modulation manner depending on a modulation selecting signal included in the input signal inputted into the first converting unit.

Description

[0001] The present invention relates to a single-channel or multi-channel modulator having a multi-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a short-channel or multi-channel modulation apparatus having a complex modulation unit, and more particularly, to a technique capable of outputting broadcast signals of various modulation schemes using only one board.

Terrestrial broadcasting is a broadcasting system that transmits radio waves through a transmission station or a relay station installed on the ground and receives the radio waves through an antenna at home or the like.

Terrestrial analog broadcasting is mainly used for terrestrial broadcasting, and terrestrial digital broadcasting is added and mixed with the development of communication and computer technology.

The terrestrial digital broadcasting not only includes a large amount of data information together with terrestrial analog broadcasting, but also has an advantage of excellent broadcasting quality because it uses the 8-VSB modulation method. However, terrestrial digital broadcasting has a disadvantage that it can not be received through the existing analog TV. However, as digital TVs have become more popular due to the development of digital technologies, generations are being replaced.

On the other hand, as for the policy, analog TV broadcasting belonging to the old technology differs depending on the country, but the timing of the stop is gradually approaching.

However, once purchased, the owner of an analog TV will not be able to easily replace the TV even though the terrestrial analog broadcasting will be discontinued due to the nature of the TV that can be used for a long time.

In order to solve such a problem, a set-top box for receiving terrestrial digital broadcasting and converting it into an analog TV signal has been proposed. However, such a set-top box is required to be installed for each analog TV, so that the cost is high, and a very inefficient problem occurs in a large residential area such as an apartment.

In order to solve such a problem, a modulator capable of modulating a short channel or a multi-channel has been proposed. However, since this modulator can process only one modulation method, A problem arises in which the number of modulation apparatuses is required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a modulator capable of performing only a single channel or multi-channel and multi-modulation with only one board.

In order to achieve the above-mentioned object, a single-channel or multi-channel modulation apparatus provided with a complex modulation unit according to an embodiment of the present invention converts an ASI input signal for each channel constituting a single channel or multiple channels into an MPEG- A first conversion unit for outputting the converted data; A second conversion unit for converting an output signal of the first conversion unit into a predetermined bit rate for each channel; A modulator for modulating an output signal of the second conversion unit for each channel and outputting the modulated output signal; And an output unit for outputting an output signal of the modulator to an RF DAC connected to a subsequent stage for each channel, wherein the modulator includes at least two modulation schemes And the complex modulation unit determines a modulation scheme according to a modulation selection signal included in an input signal input to the first conversion unit.

In the present embodiment, the complex modulation section may include a terrestrial modulation modulation section including an ATSC modulator and an 8-VSB modulator.

In the present embodiment, the complex modulation unit may include: a DVB modulation type modulation unit including a DVB-T / H modulator and a low-pass filter.

In the present embodiment, the complex modulation section may include: a modulation method modulation section according to the ITU-T J.83 Annex-B protocol.

In the present embodiment, the complex modulation unit may include a modulation method modulation unit conforming to the ITU-T J.83 Annex-A / C standard.

According to the present invention, by adopting the complex modulation unit, it is possible to cope with various types of modulation requests with only one modulation apparatus without a number of modulation apparatuses corresponding to the modulation method. This can significantly reduce the installation space of equipment installation, management problems, and equipment cost burden.

1 is a block diagram of a modulation apparatus according to an embodiment of the present invention.
2 is a detailed view of the complex modulation unit in FIG.

Hereinafter, a single-channel or multi-channel modulation apparatus having a complex modulation unit according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Further, the terms described below are terms set in consideration of the functions of the present invention, and these terms may vary depending on the intention or custom of the producer producing the product, and definitions of the terms should be based on the contents throughout the specification.

(Example)

Hereinafter, a single-channel or multi-channel modulation apparatus having a complex modulation unit according to the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram of a modulation apparatus according to an embodiment of the present invention, and FIG. 2 is a detailed view of the composite modulation unit in FIG.

As shown in FIG. 1, a single-channel or multi-channel modulation apparatus 100 having a complex modulation unit according to the present embodiment (hereinafter referred to as a " multi-channel & Modulating device 'is simply referred to as a' modulating device ') is characterized in that the modulating part of the modulating device including the first converting part, the second converting part, the modulating part and the output part is replaced by the composite modulating part 100 .

The first converter 10, the second converter 20, the output unit 30, the microcontroller unit (MCU) 40 and the RF DAC 50 (radio frequency digital-to-analog converter) And therefore detailed description thereof is omitted.

The complex modulation unit 100 includes a modulation unit of a terrestrial modulation scheme, a modulation scheme of a DVB modulation scheme, a modulation scheme modulation unit conforming to ITU (International Telecommunication Union) -T J.83 Annex-B protocol, and ITU-T J.83 Annex-A / C < / RTI > protocol.

The terrestrial modulation scheme modulator includes an Advanced Television Systems Committee (ATSC) modulator 102 and an 8-VSB (Vestigial Side Band) modulator 104.

The ATSC modulator 102 performs data randomization, Reed Solomon encoding, data interleaving, Trellis encoding, Sync Mux Pilot Insertion, and VSB modulation. The 8-VSB The modulator 104 modulates it to 8-VSB. Such a terrestrial modulation modulation section can support ATSC A / 53 Part 2, and the symbol rate is preferably fixed to 10.762237 Mbauds. However, the present invention is not particularly limited thereto, and it should be noted that a well-known terrestrial modulation modulation section may be used.

The DVB modulation method modulation section includes a DVB (Digital Video Broadcasting) -T / H modulator 112 and a low pass filter 114.

The DVB-T / H modulator 112 modulates the data through known data processing. This DVB-T / H modulator 112 supports DVB-T / H ETSI EN 300 744 and programs the convolutional encoding ratio at 1/2, 2/3, 3/4, 5/6 and 7/8 QPSK, 16-QAM, 64-QAM, 2K, 4K, and 8K OFDM modes and programmable guard intervals It is desirable to support Programmable Guard Interval Insertion 1/4, 1/8, 1/16 and 1/32.

It is preferable that the modulation scheme modulator 122 according to the ITU-T J.83 Annex-B protocol supports QAM-64 and QAM-256. The symbol rates at this time may be 5.05694 and 5.360537 Mbauds, respectively.

The modulation scheme modulator 132 according to the ITU-T J.83 Annex-A / C protocol can configure a symbol rate of up to 7 Mbauds and preferably supports QAM-16/32/64/128/256.

In the complex modulation unit 100 having the above configuration, the modulation method is determined according to the modulation selection signal included in the input signal input to the first conversion unit 10, and modulation is performed. In the output unit 30, And outputs a modulated signal according to the selection signal to the RF DAC.

The specific embodiments of the present invention have been described above.

It will be apparent to those skilled in the art that various modifications and variations can be made in the details of the present invention without departing from the spirit and scope of the invention as defined in the appended claims. You must understand.

Therefore, it should be understood that the above-described embodiments are provided to fully illustrate the scope of the invention to a person having ordinary skill in the art to which the present invention belongs, Are only defined by the scope of the claims.

10: first conversion section 20: second conversion section
30: output unit 40: MCU
50: RF DAC 100: complex modulation section
102: ATSC modulator 104: 8-VSB modulator
112: DVB-T / H modulator 114: low pass filter
122: ITU-T J.83 Annex-B modulator 132: ITU-T J.83 Annex-A / C modulator
150: modulation device

Claims (5)

A first converting unit for converting an Asynchronous Serial Interface (ASI) input signal for each channel constituting a single channel or a multi-channel into a Moving Picture Experts Group Transport Stream (MPEG-TS) signal; A second conversion unit for converting an output signal of the first conversion unit into a predetermined bit rate for each channel; A modulator for modulating an output signal of the second conversion unit for each channel and outputting the modulated output signal; And an output unit for outputting an output signal of the modulation unit to an RF DAC (Radio Frequency Digital-to-Analog Converter) connected to a rear end of each channel, wherein a single channel or multi-channel modulation device In this case,
Wherein the modulation section is replaced by a complex modulation section including a modulator using at least two modulation schemes,
Wherein the modulation unit determines the modulation scheme according to the modulation selection signal included in the input signal input to the first conversion unit.
The apparatus of claim 1, wherein the complex modulation unit comprises:
Channel modulator comprising an ATSC (Advanced Television Systems Committee) modulator and an 8-VSB (Vestigial Side Band) modulator.
The apparatus of claim 1, wherein the complex modulation unit comprises:
And a DVB modulation modulator including a DVB (Digital Video Broadcasting) -T / H modulator and a low-pass filter.
The apparatus of claim 1, wherein the complex modulation unit comprises:
Channel modulation or multichannel modulation apparatus having a complex modulation unit according to an International Telecommunication Union (ITU) -T J.83 Annex-B protocol.
The apparatus of claim 1, wherein the complex modulation unit comprises:
Channel modulation or multi-channel modulation apparatus having a complex modulation unit according to ITU (International Telecommunication Union) -T J.83 Annex-A / C protocol.
KR1020120132285A 2012-11-21 2012-11-21 A single/multi-channel modulating apparatus having multi-modulator KR20140065131A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120132285A KR20140065131A (en) 2012-11-21 2012-11-21 A single/multi-channel modulating apparatus having multi-modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120132285A KR20140065131A (en) 2012-11-21 2012-11-21 A single/multi-channel modulating apparatus having multi-modulator

Publications (1)

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KR20140065131A true KR20140065131A (en) 2014-05-29

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