KR0127231B1 - Channel decision method of autochannel search system of television system - Google Patents

Channel decision method of autochannel search system of television system

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Publication number
KR0127231B1
KR0127231B1 KR1019940014102A KR19940014102A KR0127231B1 KR 0127231 B1 KR0127231 B1 KR 0127231B1 KR 1019940014102 A KR1019940014102 A KR 1019940014102A KR 19940014102 A KR19940014102 A KR 19940014102A KR 0127231 B1 KR0127231 B1 KR 0127231B1
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South Korea
Prior art keywords
channel
hrc
detected
tuning
recognizing
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KR1019940014102A
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Korean (ko)
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KR960003333A (en
Inventor
이창용
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구자홍
엘지전자주식회사
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Priority to KR1019940014102A priority Critical patent/KR0127231B1/en
Publication of KR960003333A publication Critical patent/KR960003333A/en
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Publication of KR0127231B1 publication Critical patent/KR0127231B1/en

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    • 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
    • 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
    • H04N5/50—Tuning indicators; Automatic tuning control

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Television Receiver Circuits (AREA)

Abstract

This invention provides a method of recognizing a normal channel or a harmonic related carrier (HRC) channel by checking an automatic fine tuning (AFT) voltage when detecting a synchronous signal by scanning a channel. This method includes the steps of determining if a synchronous signal is detected through a selected channel; producing reference tuning data and HRC tuning data to tune all the channels by recognizing the currently-selected channel as an HRC one if the synchronous signal is not detected; producing reference tuning data by checking the AFT voltage output from the tuner and recognizing the currently selected channel as a normal channel if the synchronous signal is detected; and when the AFT voltage does not attain a given level, tuning the HRC channel, and if the channel's AFT voltage attains the level, recognizing it as HRC channel, and if not so, recognizing it as a normal channel.

Description

텔레비젼수상기의 오토서치시 채널 판별방법Channel discrimination method during auto search of TV receiver

제1도는 일반적인 텔레비젼수상기의 채널 판별방법에 대한 흐름도.1 is a flowchart of a channel discriminating method of a general television receiver.

제2도는 본 발명의 채널 판별방법이 적용되는 텔레비젼수상기의 블록도.2 is a block diagram of a television receiver to which the channel discriminating method of the present invention is applied.

제3도는 본 발명의 채널 판별방법에 대한 신호 흐름도.3 is a signal flow diagram for a channel determination method of the present invention.

제4도는 채널 주파수 대비표.4 is a channel frequency comparison table.

*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

1 : 튜너2 : 영상신호 처리부1: tuner 2: video signal processing unit

3 : 마이크로컴퓨터3: microcomputer

본 발명은 텔레비젼수상기의 채널 오토서치시 정규채널과 이조된 채널을 구분하는 기술에 관한 것으로, 특히 자동 밴드 선택 서치방식에 있어서, 동기신호가 검출되는 채널을 무조건 정규채널로 인식하지않고 자동미동조(AFT)전압을 근거로 정규채널과 이조된 채널을 구분하는데 적당하도록 한 텔레비젼수상기의 오토서치시 채널 판별방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for distinguishing a regular channel and a synthesized channel during channel auto search of a television receiver. In particular, in an automatic band selection search method, an automatic untuning is performed without recognizing a channel for which a synchronization signal is detected as a normal channel. The present invention relates to a channel discrimination method for auto search of a television receiver suitable for distinguishing a normal channel from a double channel based on an (AFT) voltage.

일반적인 텔레비젼수상기의 오토서치시 채널 판별방법을 제1도를 참조하여 설명하면 하기와 같다.A method of discriminating a channel during auto search of a general television receiver will be described with reference to FIG.

오토서치모드가 설정되면 5채널 또는 6채널 이외에서는 표준주파수와 HRC(HRC : Harmonic Related Carrier)주파수를 튜닝하도록 튜너에 해당 튜닝데이타를 출력하다가 5채널 또는 6채널이 선택되면 튜너로 하여금 표준채널을 튜닝하도록 튜닝데이타를 출력한다.When the auto search mode is set, the tuner outputs the corresponding tuning data to tune the standard frequency and the HRC (Harmonic Related Carrier) frequency except for 5 or 6 channels. When 5 or 6 channels are selected, the tuner selects the standard channel. Output tuning data for tuning.

그리고, 상기 표준주파수로 튜닝된 채널을 통해 수신되는 신호를 스캔하여 동기신호가 검출되면 정규채널로 인식하여 모든 채널에 대한 표준튜닝데이타를 출력하고, 동기신호가 검출되지 않으면 HRC 채널로 인식하여 표준채널 및 HRC 채널을 튜닝하도록 해당 튜닝데이타를 출력하여 오토서치를 수행하게 된다.When the synchronization signal is detected by scanning a signal received through the channel tuned to the standard frequency, the signal is recognized as a normal channel, and standard tuning data is output for all channels. If the synchronization signal is not detected, the signal is recognized as an HRC channel. The auto search is performed by outputting the corresponding tuning data to tune the channel and the HRC channel.

그러나, 이와 같은 채널 판별방법에 있어서는 튜너의 자동미동조 대역이 넓을 경우 이조채널이라 할지라도 동기신호가 검출되는 것을 감안하지 않고 무조건 동기신호가 검출되면 정규채널로 인식하게 되므로 본의아니게 HRC 채널을 스킵하게 되는 문제점이 있었다.However, in such a channel discrimination method, when the tuner's auto-tuning band is wide, even if the duplex channel is not considered, the synchronization signal is detected, and when the synchronization signal is detected unconditionally, the channel is recognized as a normal channel. There was a problem to be skipped.

따라서, 본 발명의 목적은 채널을 스캔하여 동기신호가 검출되는 경우 그 동기신호가 검출된 채널을 무조건 정규채널로 인식하지 않고 자동미동조 전압을 체크하여 그 체크 결과에 따라 해당 채널을 정규채널로 인식하든지 HRC 채널로 인식하는 방법을 제공함에 있다.Accordingly, an object of the present invention is to scan a channel and, when a synchronization signal is detected, does not recognize the channel where the synchronization signal is detected as a normal channel, but checks the auto-tuning voltage and converts the channel into a normal channel according to the check result. The present invention provides a method of recognizing or recognizing an HRC channel.

상기의 목적을 달성하기 위한 본 발명의 오토서치시 채널 판별방법은 오토서치모드에서 5채널 또는 6채널이 선택되면 튜너로 하여금 정규채널을 튜닝하도록 튜닝데이타를 출력하여 채널을 선국해가면서 선국된 채널을 통해 동기신호가 검출되는지를 확인하는 제 1 과정과, 상기 제 1 과정의 확인 결과 동기신호가 검출되지 않으면 현재 선국된 채널을 HRC 채널로 인식하여 모든 채널을 튜닝하도록 표준튜닝데이타와 HRC 튜닝데이타를 출력하는 제 2 과정과, 상기 제 1 과정의 확인결과 동기신호가 검출되면 튜너에서 출력되는 자동미동조 전압을 조사하여 소정 레벨에 속하면 현재 선국된 채널을 정규채널로 인식하여 표준튜닝데이타를 출력하는 제 3 과정과, 상기 자동미동조 전압이 소정레벨에 속하지 않는 경우 HRC 채널에 대한 튜닝을 수행하여 그 채널의 자동미동조 전압이 소정레벨에 속하면 그 채널을 HRC 채널로 인식하고, 소정레벨에 속하지 않으면 정규채널로 인식하는 제 4 과정으로 이루어진다.In the auto search channel determination method of the present invention for achieving the above object, if 5 or 6 channels are selected in the auto search mode, the channel tuned while tuning the channel by outputting tuning data so that the tuner tunes the regular channel. A first step of checking whether a synchronization signal is detected through the first step; and if the synchronization signal is not detected as a result of the check of the first step, the standard tuning data and the HRC tuning data are recognized to tune all channels by recognizing the currently tuned channel as an HRC channel. In the second process of outputting the signal, and when the synchronization signal is detected as a result of the checking of the first process, the autotuning voltage output from the tuner is examined, and if it belongs to a predetermined level, the currently tuned channel is recognized as a regular channel and the standard tuning data is obtained. A third step of outputting and tuning the HRC channel when the auto-tuning voltage does not belong to a predetermined level US automatic tuning voltage belongs to a predetermined level, recognizing that a channel HRC channels, comprises a fourth step of recognizing the regular channels do not belong to the predetermined level.

제2도는 본 발명의 오토서치시 채널 판별방법이 적용되는 텔레비젼수상기의 블록도로서 이에 도시한 바와 같이, 안테나를 통해 입력되는 방송신호를 수신하여 외부로부터 입력되는 튜닝데이타에 따라 하나의 채널을 선국하여 중간주파수의 영상신호(VIDEO)를 추출하는 튜너(1)와, 상기 튜너(1)에서 출력되는 영상 신호(VIDEO)를 처리하여 동기신호(Sync)를 검출해내는 영상신호 처리부(2)와, 상기 튜너(1)에 튜닝데이타를 출력하여 원하는 채널이 선국되도록하고, 그 튜너(1)에서 출력되는 자동미동조신호(AFT) 및 상기 영상신호 처리부(2)에서의 동기신호(Sync) 출력여부에 따라 현재의 채널이 정규채널인지 이조된 채널인지를 판별하는 마이크로컴퓨터(3)로 구성한 것으로, 이와 같이 구성한 본 발명의 작용 및 효과를 첨부한 제 3 도 및 제 4 도를 참조하여 상세히 설명하면 다음과 같다.FIG. 2 is a block diagram of a television receiver to which a channel discrimination method according to the present invention is applied. As shown in FIG. 2, a channel is received according to tuning data received from the outside by receiving a broadcast signal input through an antenna. A tuner 1 for extracting an intermediate frequency video signal VIDEO, a video signal processor 2 for processing a video signal VIDEO output from the tuner 1, and detecting a sync signal Sync; And outputting tuning data to the tuner 1 so that a desired channel can be tuned, and outputting an auto-tuned signal AFT output from the tuner 1 and a synchronization signal Sync from the image signal processor 2. And microcomputer 3 for discriminating whether the current channel is a regular channel or a synthesized channel according to the present invention. If the person follows.

오토서치모드가 설정되면 5채널 또는 6채널 이외에서는 표준주파수와 HRC 주파수를 튜닝하도록 튜너(1)에 해당 튜닝데이타를 출력하다가 6채널이 선택되면 튜너(1)로 하여금 정규채널을 튜닝하도록 튜닝데이타를 출력하여 채널을 선국해가면서 선국된 채널을 통해 동기신호(Sync)가 검출되는지를 확인한다(S1-S4).When auto search mode is set, the tuning data is output to the tuner 1 to tune the standard frequency and the HRC frequency except for 5 or 6 channels, and when 6 channels are selected, the tuner 1 is tuned to tune the regular channel. The channel is tuned to check whether a sync signal (Sync) is detected through the tuned channel (S1-S4).

상기의 확인 결과 동기신호(Sync)가 검출되지 않으면 현재 선국된 채널을 HRC 채널을 인식하여 모든 채널을 튜닝하도록 표준튜닝데이타와 HRC 튜닝데이타를 출력한다(S5, S6).If the synchronization signal (Sync) is not detected as a result of the above confirmation, the currently tuned channel recognizes the HRC channel and outputs standard tuning data and HRC tuning data to tune all channels (S5 and S6).

그러나, 상기의 확인결과 동기신호(Sync)가 검출되면 그 채널이 실제로 존재하는 정규채널인지를 확인하기 위해 튜너(1)에서 출력되는 자동미동조(AFT) 전압을 조사하여 소정레벨(예, 1V~4V)에 속하면 현재 선국된 채널을 정규채널로 인식하여 표준튜닝데이타를 출력한 후 오토서치 기능을 수행한다(S7~S10).However, when the synchronization signal Sync is detected as a result of the check, the auto-tuning (AFT) voltage output from the tuner 1 is examined to determine whether the channel is actually a regular channel. If it belongs to ~ 4V), the currently tuned channel is recognized as a regular channel and standard tuning data is output, and then the auto search function is performed (S7 ~ S10).

그러나, 상기 자동미동조(AFT) 전압이 소정레벨(1V~4V)에 속하지 않는 경우 HRC 채널(83.25MHZ+0.75MHZ=84MHZ)에 대한 튜닝을 수행하여 그 채널의 자동미동조(AFT) 전압이 소정레벨(1V~4V)에 속하면 그 채널을 HRC 채널로 인식하고, 소정레벨(1V~4V)에 속하지 않으면 정규채널로 인식한다(S11, S12).However, if the AFT voltage does not belong to a predetermined level (1 V to 4 V), tuning is performed on an HRC channel (83.25 MHZ + 0.75 MHZ = 84 MHZ) so that the AFT voltage of the channel is increased. If it belongs to a predetermined level (1V to 4V), the channel is recognized as an HRC channel, and if it does not belong to a predetermined level (1V to 4V), it is recognized as a normal channel (S11 and S12).

이상에서 상세히 설명한 바와 같이, 발명은 채널을 스캔하여 동기신호가 검출되는 경우 그 동기신호가 검출된 채널을 무조건 정규채널로 인식하지 않고 자동미동조 전압을 체크하여 해당 채널을 정규채널로 인식하든지 HRC 채널로 인식함으로써 오토채널시 방송신호가 존재하는 채널을 스킵하지 않고 확실하게 검출할 수 있는 효과가 있다.As described in detail above, when the synchronization signal is detected by scanning a channel, the present invention does not recognize the channel in which the synchronization signal is detected as a normal channel, but checks the auto-tuning voltage to recognize the channel as a regular channel. By recognizing a channel, there is an effect that the channel can be reliably detected without skipping the channel in which the broadcast signal exists during auto channel.

Claims (1)

오토서치모드에서 5채널 또는 6채널이 선택되면 튜너로 하여금 정규채널을 튜닝하도록 튜닝데이타를 출력하여 채널을 선국해가면서 선국된 채널을 통해 동기신호가 검출되는지를 확인하는 제 1 과정과, 상기 제 1 과정의 확인 결과 동기신호가 검출되지 않으면 현재 선국된 채널을 HRC 채널로 인식하여 모든 채널을 튜닝하도록 표준튜닝데이타와 HRC 튜닝데이타를 출력하는 제 2 과정과, 상기 제 1 과정의 확인결과 동기신호가 검출되면 튜너에서 출력되는 자동미동조 전압을 조사하여 소정 레벨에 속하면 현재 선국된 채널을 정규채널로 인식하여 표준튜닝데이타를 출력하는 제 3 과정과, 상기 자동미동조 전압이 소정레벨에 속하지 않는 경우 HRC 채널에 대한 튜닝을 수행하여 그 채널의 자동미동조 전압이 소정레벨에 속하면 그 채널을 HRC 채널로 인식하고, 소정레벨에 속하지 않으면 정규채널로 인식하는 제 4 과정으로 이루어지는 것을 특징으로 하는 텔레비젼수상기의 오토서치시 채널 판별방법.A first step of checking whether a synchronization signal is detected through the tuned channel while tuning the channel by outputting tuning data to tune the regular channel when 5 or 6 channels are selected in the auto search mode; A second step of outputting standard tuning data and HRC tuning data to tune all channels by recognizing the currently tuned channel as an HRC channel if the synchronization signal is not detected as a result of step 1; and confirming the synchronization signal of the first step Is detected, the third process of outputting the standard tuning data by recognizing the currently tuned channel as a regular channel and checking the autotuning voltage output from the tuner and belonging to a predetermined level, and the autotuning voltage not belonging to a predetermined level. If not, perform tuning for the HRC channel, and if the autotuning voltage of the channel belongs to a predetermined level, recognize the channel as an HRC channel. , Do not belong to the predetermined level, the process determines how channels during auto search of the television receiver which comprises a 4 that are known to the regular channel.
KR1019940014102A 1994-06-21 1994-06-21 Channel decision method of autochannel search system of television system KR0127231B1 (en)

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KR0127231B1 true KR0127231B1 (en) 1997-12-29

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