KR20090005773A - Set-top box - Google Patents

Set-top box Download PDF

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Publication number
KR20090005773A
KR20090005773A KR1020070069074A KR20070069074A KR20090005773A KR 20090005773 A KR20090005773 A KR 20090005773A KR 1020070069074 A KR1020070069074 A KR 1020070069074A KR 20070069074 A KR20070069074 A KR 20070069074A KR 20090005773 A KR20090005773 A KR 20090005773A
Authority
KR
South Korea
Prior art keywords
signal
digital broadcast
top box
input
digital
Prior art date
Application number
KR1020070069074A
Other languages
Korean (ko)
Inventor
박광재
Original Assignee
엘지이노텍 주식회사
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.)
Filing date
Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020070069074A priority Critical patent/KR20090005773A/en
Publication of KR20090005773A publication Critical patent/KR20090005773A/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
    • H04N21/4263—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners
    • H04N21/42638—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners involving a hybrid front-end, e.g. analog and digital tuners
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6112—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving terrestrial transmission, e.g. DVB-T
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

A set top box is provided to output not only a satellite digital broadcasting signal inputted through a switching operation of a switch but also an analog signal. First and second input ports(P21,P22) input each digital broadcasting signal. A first digital broadcasting tuner(21) and a demodulator(22) output the digital broadcasting signal as an MPEG signal. A second digital broadcasting tuner(23) and a demodulator(24) output a digital broadcasting signal, inputted from the second input port, as an MPEG signal. An MPEG decoder(25) outputs digital audio/video signals by decoding the MPEG signals outputted from the first or second digital broadcasting tuner and the demodulators. A modulator(26) modulates the digital audio/video signal, outputted from the MPEG decoder, into an analog broadcasting signal. A switch(27) switches the digital broadcasting signal, inputted from the first and second input ports, and the analog broadcasting signal modulated in the modulator.

Description

Set top box {SET-TOP BOX}

1 is a block diagram of a conventional set top box

2 is a block diagram of a set top box according to an embodiment of the present invention;

* Description of the symbols for the main parts of the drawings *

P21, P22; 1st, 2nd input port

21; 1st Digital Video Broadcast Tuner

22; 1st Digital Video Broadcast Demodulator

23; 2nd digital video broadcast tuner

24; 2nd digital video broadcasting demodulator

25; MPEG decoder 26; Modulator

27; Switch

The present invention relates to a set top box.

Generally, a set top box is a necessary device for receiving satellite broadcasts in a home, and the set top box is a device capable of receiving and watching broadcast signals of various channels broadcast from a satellite broadcasting system in connection with a television.

At this time, the various channel broadcast signals received from the satellite broadcasting system are classified into satellite digital video broadcasting DVB-S (Satellite), digital cable video broadcasting DVB-C (Cable), and terrestrial digital video broadcasting DVB-T (Terrestrial).

The satellite digital video broadcasting DVB-S is divided into standard density (SD) and high density (HD) broadcasting. As the standard for high density (HD) satellite broadcasting is commercialized, high density (HD) digital video broadcasting is watched. In addition, the set-top box is provided with a first input port P1 for inputting standard-definition digital video broadcasting from a satellite antenna, as shown in FIG. And a second input port P2 for inputting high density digital video broadcasting; A first digital video broadcast tuner (DVB-) for outputting a standard density digital video broadcast input from the first input port P1 as a baseband signal corresponding to a selected channel, and demodulating the baseband signal as an MPEG signal. S1) 11 and a first digital video broadcast demodulator (DVB-S1) 12; A second digital video broadcast tuner (DVB-S2) which outputs a high density digital video broadcast input from the second input port P2 as a baseband signal corresponding to a selected channel, and demodulates the baseband signal as an MPEG signal. 13 and a second digital video broadcast demodulator (DVB-S2) 14; An MPEG decoder 15 for decoding an MPEG signal output from the first digital video broadcast demodulator 12 and the second digital video broadcast demodulator 14 and outputting an audio / video signal; One of the first and second input ports P1 and P2 includes a loop through 16 to which a subset top box SUB STB is connected.

The conventional set-top box configured as described above is provided through the first and second digital video broadcast tuners 11 and 13 inputted from the first or second input ports P1 and P2 according to the digital video broadcast selection. After converting the baseband signal, the converted baseband signal is demodulated through the first and second digital video broadcast demodulators 12 and 14 and output to the MPEG decoder 15 as an MPEG signal. The MPEG decoder 15 decodes the MPEG signal and outputs a satellite digital audio / video signal (A / V).

When the set top box performs the sub set top box (SUB STB) function, the first and second digital video broadcasts DVB-S1 and DVB-S2 input from the first and second input ports P1 and P2 are performed. ) Is received through the loop through 16.

However, if the set-top box wants to receive satellite digital video broadcast as an analog terrestrial broadcast, a modulator (MODULATOR) 17 that needs to convert the digital video broadcast to an analog terrestrial broadcast is required. 17, a digital audio / video (A / V) signal output from the MPEG decoder 15 of the satellite set-top box is modulated and output by analog terrestrial broadcasting.

As described above, in the conventional set-top box, the modulator needs to be manufactured separately in order to receive the satellite digital video broadcast by analog terrestrial broadcast, and the separate manufacture and purchase of the separately provided modulator in the set-top box is required. There are troublesome costs and work.

The present invention receives satellite digital video broadcast as well as analog terrestrial broadcast in a set top box.

The set top box of the present invention comprises: first and second input ports for inputting a digital broadcast signal, and a first digital broadcast tuner and a demodulator for outputting the digital broadcast signal as an MPEG signal; A second digital broadcast tuner and a demodulator for outputting a digital broadcast signal input from the second input port as an MPEG signal; An amplifier decoder for decoding an MPEG signal output from the first or second digital broadcast tuner and demodulators and outputting a digital audio / video signal; A modulator for modulating the digital audio / video signal output from the MPEG decoder into an analog broadcast signal; And a switch unit for switching the digital broadcast signal input from the first and second input ports and the analog broadcast signal modulated by the modulator.

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

2 is a block diagram of a set top box according to an embodiment of the present invention.

The first input port P21 and the second input port P22 are connected to each satellite antenna to input standard density and high density satellite digital video broadcasting signals.

The first digital broadcast tuner 21 converts the standard density digital broadcast signal input from the first input port P21 into a baseband signal corresponding to a desired channel and outputs the converted baseband signal.

The first digital broadcast demodulator 22 demodulates the baseband signal of the standard density converted from the satellite digital broadcast tuner 21 and outputs it as an MPEG signal.

The second digital broadcast tuner 23 converts the high density digital broadcast signal input from the second input port P22 into a baseband signal corresponding to a desired channel and outputs the converted baseband signal.

The second digital broadcast demodulator 24 demodulates the high density baseband signal converted from the satellite digital broadcast tuner 23 and outputs the MPEG signal.

The MPEG decoder 25 decodes an MPEG signal that is demodulated from the first or second satellite digital video broadcasting demodulator 22 or 24 and outputs a digital audio / video signal.

The modulator 26 modulates the digital audio / video signal output from the MPEG decoder 25 into an analog audio / video signal and outputs it as a terrestrial signal. The modulator 26 outputs the first digital broadcast tuner 21. And a demodulator 22, a second digital broadcast tuner 23, a demodulator 24, and one chip board.

Since the modulator 26 has a signal band different from a digital audio / video broadcast signal and a modulated analog terrestrial wave, the first and second digital broadcast tuner sides and the ground are separated on the one chip board to prevent mutual signal interference. And it is configured to shield with a chassis.

The switch unit 27 outputs a signal of any one of digital video broadcasting signals of the first and second input ports P21 and P22 and an analog signal modulated by the modulator 26. Wow; A loop through (L / T) for outputting a digital broadcast signal of one of the first and second input ports (P21) and P22, and the modulator (26) when the loop through (L / T) is blocked. And a switch SW for outputting a modulated signal, and the switch SW outputs an analog signal modulated by the modulator 26 through the output port P23 when ON. When the switch SW is OFF, the analog signal modulated by the modulator 26 is cut off through the output port P23.

The control unit 30 is connected to the switch unit 27 to block digital broadcast signals of the first and second input ports P21 and P22 that are input to the loop through when the TV is connected to the output port, and the switch ( SW) is turned on and the digital broadcast signals of the first and second input ports P21 and P22 are connected through the loop through L / T and the output port P23 when the subset top box is connected to the output port. Output to the subset top box, and configured to turn off the switch (SW).

According to the present invention configured as described above, the digital broadcast signals input from the first and second input ports P21 and P22 are converted into baseband signals through the first and second digital broadcast tuners 21 and 23, respectively. The converted baseband signal is demodulated through the first and second digital broadcast demodulators 22 and 24 and output as an MPEG signal, and the MPEG signal is decoded by the MPEG decoder 25. And output as a digital audio / video signal (A / V1) (A / V2), the digital audio / video signal (A / V1) (A / V2) is modulated into an analog terrestrial signal through a modulator (26). And output.

 The analog terrestrial signal output to the modulator 25 as described above is looped by controlling the switch unit 27 in the control unit 30 when the television set is connected to the output port P23 of the switch unit 27. The through (L / T) is turned off to block the digital broadcast signal input to the first and second input ports P21 and P22, while the switch SW is turned on to be modulated by the modulator 27. By outputting the analog signal to the television through the switch SW, the loop through L / T and the output port P23, the television receives satellite digital broadcast modulated with the analog signal.

On the other hand, when the sub-top box SUB STB is connected to the output port P23 of the switch unit 27, the controller 30 controls the switch unit 27 to turn off the switch SW. While the analog signal modulated by the modulator 26 is not output, the standard density and high density digital input to the first and second input ports P21 and P22 by turning on the loop through L / T. The broadcast signal is output to the subset top box SUB STB through the loop through L / T and the output port P23.

In this case, when the SUB STB wants to receive a standard density digital broadcast signal, the SUB STB outputs a control signal for selecting a standard density digital broadcast signal to the set top box. In the set-top box, the control unit 30 receives the control signal. Accordingly, the control unit 30 selects the first input port P21 for the loop through L / T of the switch unit 27. The signal is output so that the loop through L / T receives the selected standard density digital broadcast signal.

When the sub-top box SUB STB receives a high density digital broadcast signal, the sub-top box SUB STB outputs a control signal for selecting the high-density digital broadcast signal to the set-top box. In this case, the control unit 30 receives the control signal. Accordingly, the control unit 30 applies a control signal for selecting the second input port P22 to the loop through L / T of the switch unit 27. And outputs the loop through L / T to receive the selected high density digital broadcast signal.

As described above, the present invention outputs the MPEG signal through the satellite digital broadcast signal received through the two input ports through the two satellite digital broadcast tuners and the demodulator, and converts the MPEG signal into the digital audio / video signal through the MPEG decoder. A modulator for modulating the digital audio / video signal output from the MPEG decoder into an analog signal in a set-top box for outputting the signal, and satellite digital broadcasting received from the two input ports and an analog signal modulated by the modulator to receive a control signal. By providing a switch unit for selectively outputting through the output port by the output, not only do not need to install a separate modulator when receiving the satellite digital broadcast signal as an analog signal, but also the satellite digital broadcast signal input by the switching operation of the switchDay which will provide an effect capable of outputting a log signal.

Claims (10)

First and second input ports for inputting a digital broadcast signal, and a first digital broadcast tuner and a demodulator for outputting the digital broadcast signal as an MPEG signal; A second digital broadcast tuner and a demodulator for outputting a digital broadcast signal input from the second input port as an MPEG signal; An amplifier decoder for decoding an MPEG signal output from the first or second digital broadcast tuner and demodulators and outputting a digital audio / video signal; A modulator for modulating the digital audio / video signal output from the MPEG decoder into an analog broadcast signal; And a switch unit configured to switch the digital broadcast signal input from the first and second input ports and the analog broadcast signal modulated by the modulator. The set-top box of claim 1, wherein the modulator includes the first digital broadcast tuner and a demodulator, and the second digital broadcast tuner and a demodulator on a chip board, and separates the ground and shields the chassis. 2. The apparatus of claim 1, wherein the switch unit comprises: an output port for outputting any one of digital broadcast signals of the first and second input ports and an analog signal modulated by the modulator; And a loop through outputting a digital broadcast signal of any one of the digital broadcasts of the first and second input ports, and a switch outputting a modulated signal of the modulator when the loop through is blocked. 4. The switch of claim 3, wherein the switch outputs an analog signal modulated by the modulator through the output port when ON, and blocks an analog signal modulated by the modulator when OFF. Set-top box. 5. The apparatus of claim 4, further comprising a control unit for controlling the switch unit, and when the television set is connected to the output port, the control unit blocks the digital broadcast signals of the first and second input ports input through the loop through. And the switch is turned on. The method of claim 5, wherein when the subset top box is connected to the output port, the controller outputs the digital broadcast signals of the first and second input ports to the subset top box through the loop through and output ports. Set-top box characterized in that the switch off. The apparatus of claim 6, wherein the controller controls the loop through to receive a signal output from the first input port when the control signal for selecting the digital broadcast signal of the first input port is input from the subset top box. Set-top box, characterized in that. The control apparatus of claim 6, wherein the control unit controls the loop through to receive a signal output from the second input port when the control signal for selecting the digital broadcast signal of the second input port is received from the subset top box. Set-top box, characterized in that. 9. The method of any one of claims 1 to 8, wherein the first input port receives a standard density satellite digital broadcast signal from the satellite antenna, and the second input port comprises a high density satellite digital broadcast signal being input. Set-top box, characterized in that. The set top box according to any one of claims 1 to 8, wherein the analog broadcast signal modulated by the modulator is an analog terrestrial broadcast signal.
KR1020070069074A 2007-07-10 2007-07-10 Set-top box KR20090005773A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070069074A KR20090005773A (en) 2007-07-10 2007-07-10 Set-top box

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070069074A KR20090005773A (en) 2007-07-10 2007-07-10 Set-top box

Publications (1)

Publication Number Publication Date
KR20090005773A true KR20090005773A (en) 2009-01-14

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ID=40487309

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020070069074A KR20090005773A (en) 2007-07-10 2007-07-10 Set-top box

Country Status (1)

Country Link
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