KR20030024416A - Input signal processing apparatus for cable set top box - Google Patents

Input signal processing apparatus for cable set top box Download PDF

Info

Publication number
KR20030024416A
KR20030024416A KR1020010057557A KR20010057557A KR20030024416A KR 20030024416 A KR20030024416 A KR 20030024416A KR 1020010057557 A KR1020010057557 A KR 1020010057557A KR 20010057557 A KR20010057557 A KR 20010057557A KR 20030024416 A KR20030024416 A KR 20030024416A
Authority
KR
South Korea
Prior art keywords
signal
signals
vsb
high frequency
input
Prior art date
Application number
KR1020010057557A
Other languages
Korean (ko)
Other versions
KR100834016B1 (en
Inventor
정수원
Original Assignee
엘지전자 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 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020010057557A priority Critical patent/KR100834016B1/en
Publication of KR20030024416A publication Critical patent/KR20030024416A/en
Application granted granted Critical
Publication of KR100834016B1 publication Critical patent/KR100834016B1/en

Links

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
    • H04N21/43—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 encoded video stream 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]
    • H04N21/40—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 encoded video stream packets from an IP network
    • H04N21/4383—Accessing a communication channel
    • 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
    • H04N21/6118—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving cable transmission, e.g. using a cable modem
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/455—Demodulation-circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE: A device for processing input signals of a cable set-top box is provided to transmit VSB signals without detecting and converting the VSB signals by bypassing the VSB signals. CONSTITUTION: A tuner(11) receives high frequency input signals and selects high frequency signals of a requested channel, and converts the selected high frequency signals into intermediate frequency signals. A QAM(Quadrature Amplitude Modulation) demodulator(12) demodulates the intermediate frequency signals for outputting transport stream. An audio/video processor(13) restores original audio and video signals from the transport stream. A VSB signal detector(14) confirms whether the intermediate frequency signals are VSB type signals, and outputs a control signal. A remodulator(15) remodulates complex video signals and audio signals into high frequency signals. A switch(16) selects the high frequency input signal while normally transporting the output signals of the remodulator to a digital TV through a specific channel. A micro processor(17) generates a message requesting TV input signals switch and outputs the message to the audio/video processor when receiving the control signal.

Description

케이블 셋톱박스의 입력신호 처리장치{INPUT SIGNAL PROCESSING APPARATUS FOR CABLE SET TOP BOX}Input signal processing device for cable set top box {INPUT SIGNAL PROCESSING APPARATUS FOR CABLE SET TOP BOX}

본 발명은 케이블을 통해 재전송된 지상파 디지털 티브이신호를 자동적으로 바이패스시키는 기술에 관한 것으로, 특히 케이블 셋톱박스에서 튜너의 중간주파수 출력으로부터 VSB 신호가 출력될 때 리모듈레이션 신호 대신 고주파 입력신호를 선택하여 특정 채널(CH3 or CH4)을 통해 디지털 티브이측으로 출력할 수 있도록 한 케이블 셋톱박스의 입력신호 처리장치에 관한 것이다.The present invention relates to a technology for automatically bypassing a terrestrial digital TV signal retransmitted through a cable. In particular, when a VSB signal is output from a tuner's intermediate frequency output in a cable set-top box, The present invention relates to an input signal processing apparatus of a cable set-top box capable of outputting to a digital TV side through a specific channel (CH3 or CH4).

최근들어, 디지털 지상파 방송이 시작되면서 케이블망에서의 지상파 신호 의무 재전송에 대한 처리가 요구되고 있다. 그런데, 지상파 디지털 티브이신호의 전송방식은 VSB이고, 케이블 디지털 티브이신호의 전송방식은 QAM이므로 이들의 복조방식도 서로 다르게 되어야 한다.Recently, as digital terrestrial broadcasting starts, processing of mandatory retransmission of terrestrial signals in a cable network is required. However, since the transmission method of the terrestrial digital TV signal is VSB and the transmission method of the cable digital TV signal is QAM, their demodulation method should be different.

따라서, 케이블 셋톱박스의 경우, 의무 재전송되는 VSB 신호를 복조 처리하여 디코딩하거나, 디지털 티브이에서 복조처리할 수 있도록 바이패스시켜 줄 필요가 있다.Therefore, in the case of a cable set-top box, it is necessary to demodulate and decode a VSB signal transmitted by a mandatory retransmission or bypass the demodulation process in a digital TV.

그럼에도 불구하고, 종래의 케이블 셋톱박스에서는 의무 재전송되는 VSB 신호를 복조 처리하여 디코딩하거나, 디지털 티브이에서 복조처리할 수 있도록 바이패스시켜 주는 기능이 구비되어 있지 않아 VSB 신호를 서비스하는데 어려움이 있었다.Nevertheless, in the conventional cable set-top box, it is difficult to service the VSB signal because it is not equipped with a function of demodulating and decoding the mandatory retransmission of the VSB signal or bypassing the demodulation process in the digital TV.

따라서, 본 발명의 목적은 튜너의 중간주파수 출력으로부터 VSB 신호가 출력되는지 조사하고, 그 VSB 신호가 검출될 때 해당 고주파 입력신호를 특정 채널(CH3 or CH4)을 통해 디지털 티브이측으로 바이패스키시키는 케이블 셋톱박스의 입력신호 처리장치를 제공함에 있다.Accordingly, an object of the present invention is to investigate whether a VSB signal is output from the tuner's intermediate frequency output, and when the VSB signal is detected, bypassing the corresponding high frequency input signal to a digital TV through a specific channel (CH3 or CH4). An input signal processing apparatus for a set top box is provided.

도 1은 본 발명에 의한 케이블 셋톱박스의 입력신호 처리장치의 블록도.1 is a block diagram of an input signal processing apparatus of a cable set-top box according to the present invention.

도 2는 도 1에서 VSB신호 검출기의 상세 블록도.FIG. 2 is a detailed block diagram of the VSB signal detector in FIG. 1. FIG.

도 3은 본 케이블 셋톱박스와 디지털 티브의 신호접속 관계를 보인 개략도.3 is a schematic diagram showing a signal connection relationship between the present cable set-top box and the digital TV.

** 도면의 주요 부분에 대한 부호의 설명 **** Description of symbols for the main parts of the drawing **

11 : 튜너12 : QAM 복조기11: tuner 12: QAM demodulator

13 : 오디오/비디오 프로세서14 : VSB신호 검출기13 Audio / Video Processor 14 VSB Signal Detector

14A : 버퍼14B : 엔벨로프 검출기14A: Buffer 14B: Envelope Detector

14C : 비교기15 : VSB신호 검출기14C: Comparator 15: VSB Signal Detector

15 : 리모듈레이터16 : 스위치15: modulator 16: switch

17 : 마이크로프로세서17 microprocessor

본 발명의 제1특징에 따르면, 튜너의 중간주파수 신호로부터 VSB 신호를 검출하는 장치를 갖는다.According to a first aspect of the present invention, there is provided an apparatus for detecting a VSB signal from an intermediate frequency signal of a tuner.

본 발명의 제2특징에 따르면, 튜너의 중간주파수 신호로부터 VSB 신호가 검출될 때 그에 따른 제어신호를 이용하여, 리모듈레이션된 신호(CVBS & Audio) 대신 고주파 입력신호를 선택하여 특정 채널(CH3 또는 CH4)측으로 출력하는 스위칭 장치를 갖는다.According to a second aspect of the present invention, when a VSB signal is detected from an intermediate frequency signal of a tuner, a control signal corresponding thereto is used to select a high frequency input signal instead of a modulated signal (CVBS & Audio) to select a specific channel (CH3 or It has a switching device for outputting to CH4) side.

본 발명의 제3특징에 따르면, VSB 신호가 검출될 때 마이크로프로세서는 비디오 프로세서를 통해 티브이 입력신호 절환을 요구하는 메시지를 출력한다.According to a third aspect of the invention, when a VSB signal is detected, the microprocessor outputs a message requesting TV input signal switching through the video processor.

이하, 첨부한 도면을 참조하여 본 발명을 설명한다.Hereinafter, the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명에 의한 케이블 셋톱박스의 입력신호 처리장치의 일실시 구현예를 보인 블록도로서 이에 도시한 바와 같이, 고주파 입력신호(RF_IN)를 입력받아 요구된 채널의 고주파신호를 선택한 후 중간주파수 신호(IF)로 변환하는 튜너(11)와; 구상 진폭 변조(QAM) 방식으로 변조되어 있는 상기 중간주파수 신호(IF)를 복조처리하여 트랜스포트스트림(TP)을 출력하는 QAM 복조기(12)와; 상기 트랜스포트스트림(TP)으로부터 원래의 오디오신호와 비디오신호를 복원하는 오디오/비디오 프로세서(13)와; 상기 중간주파수 신호(IF)가 VSB 방식의 신호인지 확인하여 VSB 방식의 신호로 판명되면 그에 따른 제어신호(CTL)를 출력하는 VSB신호 검출기(14)와; 복합영상신호(CVBS)와 오디오신호(Audio)를 고주파 형태의 신호로 재변조하는 리모듈레이터(15)와; 평상시 상기 리모듈레이터(15)의 출력신호를 선택하여 특정 채널(CH3 또는 CH4)을 통해 디지털 티브이(20)측으로 전송하다가, 상기 제어신호(CTL)에 의해 상기 고주파 입력신호(RF_IN)를 선택하는 스위치(16)와; 상기 제어신호(CTL)가 입력될 때, 티브이 입력신호 절환을 요구하는 메시지를 생성하여 상기 오디오/비디오 프로세서(13)에 출력하는 마이크로프로세서(17)로 구성한 것으로, 이와 같이 구성한 본 발명의 작용을 첨부한 도 2 및 도 3을 참조하여 상세히 설명하면 다음과 같다.1 is a block diagram showing an embodiment of an input signal processing apparatus of a cable set-top box according to the present invention. As shown in FIG. 1, a high-frequency signal of a requested channel is selected after receiving a high-frequency input signal RF_IN, A tuner 11 for converting into a frequency signal IF; A QAM demodulator (12) for demodulating the intermediate frequency signal (IF) modulated by a spherical amplitude modulation (QAM) scheme and outputting a transport stream (TP); An audio / video processor (13) for recovering original audio and video signals from the transport stream (TP); A VSB signal detector 14 which checks whether the intermediate frequency signal IF is a VSB signal and outputs a control signal CTL according to the signal when it is determined to be a VSB signal; A modulator 15 for remodulating a composite video signal CVBS and an audio signal into a high frequency signal; The switch which selects the output signal of the modulator 15 and transmits it to the digital TV 20 through a specific channel CH3 or CH4, and then selects the high frequency input signal RF_IN by the control signal CTL. (16); When the control signal (CTL) is input, it consists of a microprocessor 17 for generating a message requesting TV input signal switching and outputting to the audio / video processor 13, the operation of the present invention configured as described above If it described in detail with reference to the accompanying Figures 2 and 3 as follows.

튜너(11)는 고주파 입력신호(RF_IN)를 입력받아 사용자가 요구한 채널의 중간주파수 신호(IF)를 출력하고, QAM 복조기(12)는 QAM 방식으로 변조되어 있는 그 중간주파수 신호(IF)를 복조처리하여 트랜스포트스트림(TP)을 출력한다. 또한, 오디오/비디오 프로세서(13)는 상기 트랜스포트스트림(TP)를 처리하여 원래의 오디오신호와 비디오신호(A/V OUT)를 출력한다.The tuner 11 receives the high frequency input signal RF_IN and outputs the intermediate frequency signal IF of the channel requested by the user, and the QAM demodulator 12 outputs the intermediate frequency signal IF modulated by the QAM method. The demodulation process outputs a transport stream (TP). In addition, the audio / video processor 13 processes the transport stream TP and outputs an original audio signal and a video signal A / V OUT.

이때, VSB신호 검출기(14)는 상기 중간주파수 신호(IF)가 VSB 방식의 신호인지 비교 판단하게 되는데, 그 결과 VSB 방식의 신호가 아닌 것으로 판명되면 제어신호(CTL)를 출력하지 않게 된다. 이에 따라, 스위치(16)가 고정단자(b)에 단락된다.At this time, the VSB signal detector 14 compares and determines whether the intermediate frequency signal IF is a VSB signal. As a result, the VSB signal detector 14 does not output the control signal CTL. As a result, the switch 16 is short-circuited to the fixed terminal b.

따라서, 리모듈레이터(15)에 의해 고주파 형태로 재변조된 복합영상신호(CVBS) 및 오디오신호(Audio)가 그 상기 스위치(16)를 통해 채널(CH3 또는 CH4)로 전송된다. 그런데, 도 3에서와 같이 케이블 셋톱박스(10)의 채널(CH3 또는 CH4)이 디지털 티브이(20)의 고주파 입력포트(ANT_in)에 연결되어 있음을 알 수 있다. 그러므로, 상기 고주파 형태로 재변조된 복합영상신호(CVBS) 및 오디오신호(Audio)는 그 상기 스위치(16) 및 채널(CH3 또는 CH4)을 통해 디지털 티브이(20)의 고주파 입력포트(ANT_in)로 전달된다.Accordingly, the composite video signal CVBS and the audio signal Audio remodulated by the modulator 15 in a high frequency fashion are transmitted to the channel CH3 or CH4 through the switch 16. However, as shown in FIG. 3, it can be seen that the channel CH3 or CH4 of the cable set-top box 10 is connected to the high frequency input port ANT_in of the digital TV 20. Therefore, the composite video signal CVBS and the audio signal remodulated in the high frequency form are transferred to the high frequency input port ANT_in of the digital TV 20 through the switch 16 and the channel CH3 or CH4. Delivered.

그러나, 상기 VSB신호 검출기(14)에서의 비교 판단 결과 상기 중간주파수 신호(IF)가 VSB 방식의 신호로 판명되면 이로부터 제어신호(CTL)가 출력되어 상기 스위치(16)가 고정단자(a)에 단락된다.However, if the intermediate frequency signal IF is determined to be a VSB signal as a result of the comparison judgment by the VSB signal detector 14, the control signal CTL is output therefrom, and the switch 16 is fixed to the terminal a. Is shorted to.

이에 따라, 상기 고주파 입력신호(RF_IN)가 상기 스위치(16)에 의해 바이패스되어 상기 채널(CH3 또는 CH4)을 통해 상기 디지털 티브이(20)의 고주파 입력포트(ANT_in)로 전달된다.Accordingly, the high frequency input signal RF_IN is bypassed by the switch 16 and transmitted to the high frequency input port ANT_in of the digital TV 20 through the channel CH3 or CH4.

이때, 마이크로프로세서(17)는 상기 VSB신호 검출기(14)로부터 입력되는 제어신호(CTL)를 근거로 하여 티브이 입력신호 절환을 요구하는 메시지를 생성하여 상기 오디오/비디오 프로세서(13)에 출력한다. 이에 따라 상기 디지털 티브이(20)의 화면 상에 상기 메시지가 디스플레이되므로 사용자는 그 사실을 인식하여 디지털 티브이(20)의 고주파 입력포트(ANT_in)를 통해 입력되는 고주파신호를 튜닝할 수 있게 된다.At this time, the microprocessor 17 generates a message requesting TV input signal switching based on the control signal CTL input from the VSB signal detector 14 and outputs the message to the audio / video processor 13. Accordingly, since the message is displayed on the screen of the digital TV 20, the user can recognize the fact and tune the high frequency signal input through the high frequency input port ANT_in of the digital TV 20.

한편, 도 2는 상기 VSB신호 검출기(14)의 일실시 구현예를 나타낸 것이다. 즉, 상기 중간주파수 신호(IF)를 버퍼(14A)를 통해 버퍼링한 후 엔벨로프검출기(14B)를 통해 엔벨로프를 검출하게 된다.2 illustrates an embodiment of the VSB signal detector 14. That is, the intermediate frequency signal IF is buffered through the buffer 14A, and then an envelope is detected through the envelope detector 14B.

만약, 상기 중간주파수 신호(IF)가 VSB 방식의 신호인 경우, VSB 신호의 파일럿에 의한 DC 레벨에 의하여 엔벨로프 검출기(14B)의 출력전압이 기준전압(Vref)보다 높게 되고, 이로 인하여 비교기(14C)로부터 상기 제어신호(CTL)가 출력된다.If the intermediate frequency signal IF is a VSB signal, the output voltage of the envelope detector 14B is higher than the reference voltage Vref due to the DC level of the VSB signal pilot. From the control signal CTL.

이상에서 상세히 설명한 바와 같이 본 발명은 케이블을 통해 전송되어 오는 VSB 신호를 케이블 셋톱박스에서 검출하여 QAM 방식으로 변환하여 출력하는 것이 아니라, 그대로 바이패스시켜 특정 채널을 통해 디지털 티브이에 전송함으로써, 별다른 추가 비용 없이 의무 재전송이 요구되는 지상파 디지털 티브이의 VSB 신호를 서비스할 수 있는 효과가 있다.As described in detail above, the present invention does not detect the VSB signal transmitted through the cable in the cable set-top box, converts it into a QAM method, and outputs the signal. It has the effect of servicing VSB signals of terrestrial digital TVs that require mandatory retransmission at no cost.

Claims (4)

수신되는 중간주파수 신호를 확인하여 VSB 방식의 신호로 판명되면 그에 따른 제어신호를 출력하는 VSB신호 검출기와; 상기 제어신호에 의해 고주파 입력신호를 선택하여 디지털 티브이측으로 바이패스시키는 스위치를 포함하여 구성한 것을 특징으로 하는 케이블 셋톱박스의 입력신호 처리장치.A VSB signal detector which checks the received intermediate frequency signal and outputs a control signal according to a signal of VSB type; And a switch for selecting a high frequency input signal according to the control signal and bypassing the digital TV side. 제1항에 있어서, 상기 제어신호가 입력될 때, 티브이 입력신호 절환을 요구하는 메시지를 생성하여 오디오/비디오 프로세서측으로 출력하는 마이크로프로세서를 더 포함하여 구성된 것을 특징으로 하는 케이블 셋톱박스의 입력신호 처리장치.The input signal processing of the cable set-top box according to claim 1, further comprising a microprocessor for generating a message requesting TV input signal switching and outputting the message to the audio / video processor when the control signal is input. Device. 제1항에 있어서, VSB신호 검출기는 상기 중간주파수 신호를 완충증폭하는 버퍼와; 상기 버퍼의 출력신호에 대해 엔벨로프를 검출하는 엔벨로프 검출기와; 상기 엔벨로프 검출기의 출력전압을 기준전압과 비교하여 그 엔벨로프 검출기의 출력전압이 더 높을 때 상기 제어신호를 출력하는 비교기로 구성된 것을 특징으로 하는 케이블 셋톱박스의 입력신호 처리장치.2. The apparatus of claim 1, wherein the VSB signal detector comprises: a buffer for buffering the intermediate frequency signal; An envelope detector for detecting an envelope with respect to an output signal of the buffer; And a comparator for comparing the output voltage of the envelope detector with a reference voltage and outputting the control signal when the output voltage of the envelope detector is higher. 제1항에 있어서, 스위치는 고주파 형태로 재 변조된 복합영상신호와 오디오신호를 선택하여 특정 채널(CH3 또는 CH4)을 통해 디지털티브이의 고주파 입력포트측으로 출력하다가 상기 제어신호가 입력될 때 상기 고주파 입력신호를 선택하여그 경로로 출력하도록 구성된 것을 특징으로 하는 케이블 셋톱박스의 입력신호 처리장치.The method of claim 1, wherein the switch selects a composite video signal and an audio signal remodulated in a high frequency form and outputs the signal to a digital high frequency input port through a specific channel (CH3 or CH4), when the control signal is input. Input signal processing apparatus for a cable set-top box, characterized in that configured to select the input signal and output the path.
KR1020010057557A 2001-09-18 2001-09-18 Input signal processing apparatus for cable set top box KR100834016B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020010057557A KR100834016B1 (en) 2001-09-18 2001-09-18 Input signal processing apparatus for cable set top box

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020010057557A KR100834016B1 (en) 2001-09-18 2001-09-18 Input signal processing apparatus for cable set top box

Publications (2)

Publication Number Publication Date
KR20030024416A true KR20030024416A (en) 2003-03-26
KR100834016B1 KR100834016B1 (en) 2008-06-02

Family

ID=27724500

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020010057557A KR100834016B1 (en) 2001-09-18 2001-09-18 Input signal processing apparatus for cable set top box

Country Status (1)

Country Link
KR (1) KR100834016B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017065521A1 (en) * 2015-10-13 2017-04-20 삼성전자 주식회사 Method and apparatus for transmission and reception of multimedia data

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000045637A (en) * 1998-12-30 2000-07-25 김영환 Digital demodulator of high definition television

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017065521A1 (en) * 2015-10-13 2017-04-20 삼성전자 주식회사 Method and apparatus for transmission and reception of multimedia data
US10904610B2 (en) 2015-10-13 2021-01-26 Samsung Electronics Co., Ltd. Method and apparatus for transmission and reception of multimedia data

Also Published As

Publication number Publication date
KR100834016B1 (en) 2008-06-02

Similar Documents

Publication Publication Date Title
KR100313890B1 (en) TV set of watching Digital and Analog broadcasting signal
JP3494555B2 (en) Display device and display method
US7053961B2 (en) System and method for TV automatic gain control (AGC)
KR100532443B1 (en) Television receiver and method for detectiong and selectively filtering co-channel inteference
KR100834016B1 (en) Input signal processing apparatus for cable set top box
US6741292B1 (en) System and method for a baseband digital television
US20060270340A1 (en) Apparatus and method for distributing signals by down-converting to vacant channels
US6281945B1 (en) VSB—dependent automatic gain control
US20070256094A1 (en) Apparatus and Method for Distributing Signals by Down-Converting to Vacant Channels
US9819894B2 (en) Digital television and control method thereof
KR100785202B1 (en) Method and system for receving of digital broadcast stream
JP3883789B2 (en) Digital broadcast receiver and television receiver
KR100853677B1 (en) Ground wave receiving apparatus and method for digital television
KR100723058B1 (en) Method for receiving broadcasting signal of digital tv
KR100320450B1 (en) Receiver operation status detection device of high-definition active receiver
JPH08331474A (en) Multi-system dealing receiver
KR100490434B1 (en) Wireless transmitting/receiving system for solving time delay between video signal and audio signal
KR101117805B1 (en) Digital broadcasting receiver and operating method thereof
KR100785306B1 (en) Apparatus and method of processing broadcasting signal in digital broadcast ssytem
JPH02180474A (en) Television signal processor
KR20010004859A (en) Digital broadcasting receiver for converting automatically digital-broadcasting- format to analog-broadcasting-format
KR20080013413A (en) Broadcasting receiving apparatus and control method thereof
KR20110130906A (en) Broadcasting signal receiver having a function to automatically control a chroma signal and method for receiving a broadcasting signal using the same
KR19990070245A (en) On-Screen Display Control of Complex Satellite Broadcasting System
JPH04354278A (en) Television broadcasting receiver

Legal Events

Date Code Title Description
N231 Notification of change of applicant
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
LAPS Lapse due to unpaid annual fee