KR0160660B1 - Tv receiver channel searching method - Google Patents

Tv receiver channel searching method Download PDF

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KR0160660B1
KR0160660B1 KR1019940011770A KR19940011770A KR0160660B1 KR 0160660 B1 KR0160660 B1 KR 0160660B1 KR 1019940011770 A KR1019940011770 A KR 1019940011770A KR 19940011770 A KR19940011770 A KR 19940011770A KR 0160660 B1 KR0160660 B1 KR 0160660B1
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South Korea
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channel
oscillation frequency
signal
search process
generated
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KR1019940011770A
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Korean (ko)
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KR950035068A (en
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문양춘
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김광호
삼성전자주식회사
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/44Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50Tuning indicators; Automatic tuning control
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
    • H03J5/244Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means

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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

혼변조에 의한 오동조를 방지하는 텔레비젼 수상기의 채널탐색방법이 개시된다.Disclosed is a channel searching method of a television receiver which prevents misalignment due to intermodulation.

본 발명에 따른 채널탐색방법은 국부발진기의 발진주파수를 넓은 변동간격으로 변동시키면서 동기신호의 발생여부를 검사하는 거칠은 탐색과정과 동기신호가 발생하면 좁은 간격으로 변동시키면서 정튜닝상태에 도달시키는 세밀한 탐색과정을 구비하는 채널탐색방법에 있어서, 세밀한 탐색과정은 세밀한 발진주파수의 변동횟수를 계수하는 과정; 및 계수치가 소정의 값을 초과하면 거칠은 탐색과정으로 복귀시키는 과정을 포함함을 특징으로 한다.In the channel search method according to the present invention, the coarse search process that checks whether a synchronization signal is generated while the oscillation frequency of the local oscillator is changed at a wide variation interval and when the synchronization signal is generated is changed to a narrow interval while reaching a fine tuning state. A channel search method having a search process, the detailed search process comprising: counting the number of variations of the fine oscillation frequency; And returning to the coarse searching process when the count value exceeds a predetermined value.

본 발명에 의한 채널탐색방법은 미세동조시의 탐색횟수가 일정치이상이 되면 국부발진주파수를 큰 간격으로 변동시킴으로써 맴돌이 현상에 대응할 수 있는 효과를 갖는다.The channel searching method according to the present invention has an effect of coping with eddy phenomenon by varying the local oscillation frequency at large intervals when the number of times of fine tuning is greater than a predetermined value.

Description

텔레비젼 수상기의 채널탐색방법Channel Search Method of TV Receiver

제1도는 디지탈 튜닝장치의 일반적인 구성을 보이는 블럭도이다.1 is a block diagram showing a general configuration of a digital tuning device.

제2도는 ATF특성곡선을 보이는 특성도이다.2 is a characteristic diagram showing an ATF characteristic curve.

제3도는 종래의 채널탐색방법을 보이는 흐름도이다.3 is a flowchart showing a conventional channel search method.

제4도는 본 발명에 따른 채널탐색방법을 보이는 흐름도이다.4 is a flowchart showing a channel search method according to the present invention.

본 발명은 텔레비젼 수상기의 채널탐색방법에 관한 것으로서 더욱 상세하게는 혼변조에 의한 오동조를 방지하는 방법에 관한 것이다.The present invention relates to a channel searching method of a television receiver, and more particularly, to a method of preventing misalignment due to intermodulation.

현재 텔레비젼 수상기의 디지탈 튜닝장치가 널리 채택되어져 있다. 이러한 디지탈 튜닝장치는 AFT신호(Auto Frequency Tuning signal)에 의한 채널탐색방법을 사용하고 있다. AFT신호에 의한 채널탐색방법은 국부발진기의 발진주파수를 일정의 간격으로 변동시키면서 동기신호의 발생여부를 감시하고 동기신호가 발생된 후에는 발진주파수의 변동간격을 좁혀서 탐색하여 정튜닝에 도달하도록 하는 것이다.At present, digital tuning apparatuses for television receivers are widely adopted. Such a digital tuning device uses a channel search method using an AFT signal (Auto Frequency Tuning signal). The channel search method using the AFT signal changes the oscillation frequency of the local oscillator at regular intervals, monitors whether the synchronization signal is generated, and narrows down the interval of variation of the oscillation frequency after the synchronization signal is generated to reach the right tuning. will be.

여기서, 정튜닝에 도달하는 것을 판단하기 위하여 AFT신호의 레벨을 판별한다. 주지하는 바와 같이 AFT신호는 국부발진기의 발진주파수와 입력되는 영상반송파의 주파수가 규정의 간격을 갖는 지점을 중심점으로 하고, 발진주파수가 이 중심점으로부터 좌우로 증감함에 따라 비례적으로 증감하는 특성을 갖는다.Here, the level of the AFT signal is determined to determine that the right tuning is reached. As is well known, the AFT signal has a point where the oscillation frequency of the local oscillator and the frequency of the input image carrier have a prescribed interval are centered, and increase and decrease proportionally as the oscillation frequency increases from side to side from this center point. .

이때 입력되는 방송신호가 정상적인 신호일 경우에는 손쉽게 정튜닝상태에 도달하고 탐색이 종료되게 되지만 그렇지 않은 경우에는 발진주파수가 중심주파수로부터 좌우로 요동하게 되는 맴돌이 현상등이 발생한다.At this time, if the input broadcast signal is a normal signal, it easily reaches the right tuning state and the search is terminated. Otherwise, a eddy phenomenon such that the oscillation frequency swings left and right from the center frequency occurs.

이러한 맴돌이 현상은 특히 인접채널간의 혼변조가 발생하는 채널에서 일어나기 쉽다. 맴돌이 현상이 발생하게 되면 혼변조가 발생한 채널에서 탐색동작이 락킹(locking)되게 되므로 이를 해결하기 위하여 수동적으로 락킹상태를 해제시켜주어야 하는 문제점이 있었다.This eddy phenomenon is particularly likely to occur in channels where intermodulation between adjacent channels occurs. When the eddy phenomenon occurs, the search operation is locked in the channel where the intermodulation has occurred, so that the locking state has to be manually released to solve this problem.

따라서, 본 발명은 혼변조가 발생한 채널에서의 맴돌이현상을 극복할 수 있는 채널탐색방법을 제공하는 것을 그 목적으로 한다.Accordingly, an object of the present invention is to provide a channel search method capable of overcoming eddy phenomenon in a channel where intermodulation occurs.

상기의 목적을 달성하는 본 발명에 따른 채널탐색방법은 국부발진기의 발진주파수를 넓은 간격으로 변동시키면서 동기신호의 발생여부를 검사하는 거칠은 탐색과정과 동기신호가 발생하면 좁은 간격으로 변동시키면서 정튜닝상태에 도달시키는 세밀한 탐색과정을 구비하는 채널탐색방법에 있어서, 세밀한 탐색과정은 발진주파수의 변동횟수를 계수하는 과정; 및 계수치가 소정의 값을 초과하면 거칠은 탐색과정으로 복귀시키는 과정을 포함함을 특징으로 한다. 이하 첨부된 도면을 참조하여 본 발명을 상세히 설명한다.Channel search method according to the present invention to achieve the above object is rough tuning process to check whether the synchronization signal is generated while changing the oscillation frequency of the local oscillator at a wide interval and forward tuning while the synchronization signal occurs at a narrow interval A channel search method having a detailed search process for reaching a state, the detailed search process comprising: counting a frequency of oscillation frequency variation; And returning to the coarse searching process when the count value exceeds a predetermined value. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

제1도는 통상의 디지탈튜닝장치의 구성을 보이는 블럭도이다. 제1도에 도시된 장치에 있어서 참조부호 10은 방송신호가 유입되는 안테나(antena)이고, 12는 선택된 채널의 영상신호를 출력하는 튜너(tuner)이고, 14는 튜너(12)의 출력과 국부발진부(22)의 출력과의 중간주파신호를 출력함과 동시에 자동미세동조신호(Auto Frequency Tuning signal; 이하 AFT신호)를 출력하는 중간주파회로이고, 16은 중간주파회로(14)의 출력으로부터 영상신호를 검파하여 출력하는 영상검파회로이고, 18은 영상검파회로(16)의 출력으로부터 수직동기신호가 검출되면 판정신호(Identify signal; 이하 SYNC신호)를 검출하는 수직동기신호 검출부이고, 20은 채널선택부(24)를 통하여 입력되는 사용자의 조작명령에 따른 제어동작을 수행하는 제어부이다.1 is a block diagram showing the configuration of a conventional digital tuning apparatus. In the apparatus shown in FIG. 1, reference numeral 10 denotes an antenna through which a broadcast signal is introduced, 12 denotes a tuner for outputting an image signal of a selected channel, and 14 denotes an output and a local portion of the tuner 12. The intermediate frequency circuit outputs an intermediate frequency signal with the output of the oscillator 22 and outputs an auto frequency tuning signal (hereinafter referred to as an AFT signal), and 16 is an image from the output of the intermediate frequency circuit 14. A video detection circuit for detecting and outputting a signal, 18 is a vertical synchronization signal detection unit for detecting an identification signal (hereinafter referred to as a SYNC signal) when a vertical synchronization signal is detected from the output of the image detection circuit 16, and 20 is a channel. The controller performs a control operation according to a user's operation command input through the selection unit 24.

채널선택부(24)는 채널선택을 위한 숫자키, 채널탐색을 위한 채널업/다운키 등을 포함한다. 제어부(20)는 채널탐색시 SYNC신호와 AFT신호에 따라 채널탐색동작을 제어한다.The channel selector 24 includes a numeric key for channel selection, a channel up / down key for channel search, and the like. The controller 20 controls the channel search operation according to the SYNC signal and the AFT signal during the channel search.

중간주파회로(14)는 국부발진부(22)에서 발생된 국부발진신호와 튜너(12))에서 출력되는 고주파신호와의 주파수 차신호를 출력함과 동시에 동조상태를 나타내는 AFT신호를 출력한다.The intermediate frequency circuit 14 outputs a frequency difference signal between the local oscillation signal generated by the local oscillator 22 and the high frequency signal output from the tuner 12 and outputs an AFT signal indicating a tuning state.

제2도는 제1도에 도시된 중간주파회로에서 출력되는 AFT신호의 특성을 보이는 도면이다. AFT신호는 국부발진부(22)에서의 출력이 정동조시의 국부발진주파수(f0)로부터 벗어나는 정도에 따라 변동하는 신호이며 통상 S자형의 커브를 갖는다. 즉, 제2도에 도시되는 바와 같이 정동조시의 국부발진주파수(f0)에 해당하는 AFT신호의 값(V0)를 중심으로 적은 주파수범위에서는 V0보다 큰 값을 갖으며 큰 주파수범위에서는 V0보다 작은 값을 갖는 S자형의 특성곡선을 갖는다. 이러한 특성을 이용하여 AFT신호의 레벨을 검사함에 의해 정동조의 여부를 판단한다.2 is a view showing the characteristics of the AFT signal output from the intermediate frequency circuit shown in FIG. The AFT signal is a signal which varies in accordance with the degree that the output from the local oscillation section 22 deviates from the local oscillation frequency f0 at the time of constant tuning, and usually has an S-shaped curve. That is, as shown in FIG. 2, the AFT signal value V0 corresponding to the local oscillation frequency f0 at the time of constant tuning has a value larger than V0 in a small frequency range and smaller than V0 in a large frequency range. It has an S-shaped characteristic curve with a value. By using this characteristic, it is determined whether or not tuning is performed by checking the level of the AFT signal.

제3도는 종래의 채널탐색방법을 보이는 흐름도이다. 제3도에 도시된 채널탐색방법을 제1도 및 제2도와 결부시켜 설명한다. 채널선택부(24)로부터 채널업키가 눌려져서 채널탐색모드가 지정되면 제어부(20)는 튜너(12)의 선국상태를 1채널 증가시킨 후 제3도에 도시된 흐름도에 의한 미세동조동작을 수행한다.3 is a flowchart showing a conventional channel search method. The channel search method shown in FIG. 3 will be described in conjunction with FIGS. 1 and 2. When the channel search mode is designated by pressing the channel up key from the channel selector 24, the controller 20 increases the tuning state of the tuner 12 by one channel and then performs the fine tuning operation according to the flowchart shown in FIG. do.

먼저, 국부발진부(22)의 발진주파수를 B만큼 증가시키도록 제어한다.(300단계)First, the oscillation frequency of the local oscillator 22 is controlled to increase by B (step 300).

그리고, 수직동기신호 검출부(18)의 출력인 SYNC신호가 발생하는지의 여부를 검사한다. 수직동기신호가 검출되면 일단 미세동조의 인입영역에 들어선 것으로 판단하여 처음의 β보다 작은 값 α(α β)로 탐색간격을 설정한다. SYNC신호가 발생되지 않으면 300단계로 복귀하여 다시 주파수를 B만큼 증가시키고 SYNC신호의 발생여부를 검사하고, SYNC신호가 발생되면 320단계로 진행한다.Then, it is checked whether or not the SYNC signal which is the output of the vertical synchronization signal detector 18 is generated. Once the vertical synchronization signal is detected, it is determined that the fine tuning lead is entered, and the search interval is set to a value α (α β) smaller than the initial β. If the SYNC signal is not generated, the process returns to step 300, increases the frequency by B again, checks whether the SYNC signal is generated, and proceeds to step 320 if the SYNC signal is generated.

320단계에서는 중간주파회로(14)에서 출력되는 AFT신호의 레벨을 검사하여 정동조의 여부를 판단한다. 여기서, 정동조시의 국부발진주파수(f0)에 상응하는 AFT신호의 값을 0과 12의 중간치인 6으로 잡고 있다. AFT신호의 레벨이 중간치인 6이면 즉, 정동조상태이면, 채널탐색동작을 종료한다.In step 320, the AFT signal output from the intermediate frequency circuit 14 is examined to determine whether or not tuning is performed. Here, the value of the AFT signal corresponding to the local oscillation frequency f0 at the time of constant tuning is set to 6, which is an intermediate value between 0 and 12. If the level of the AFT signal is 6, that is, the intermediate tuning state, the channel search operation is terminated.

ATF신호의 레벨이 6보다 크면 제2도에 도시된 AFT곡선상에서 알수있는 바와 같이 국부발진주파수가 정동조시의 발진주파수보다 작은 것이므로 제어부(20)는 국부발진기(22)를 제어하여 발진주파수가 α만큼 증가되게 한 후 320단계로 복귀하여 다시 AFT신호의 레벨을 검사한다.(330∼340단계)If the level of the ATF signal is greater than 6, as shown on the AFT curve shown in FIG. 2, the local oscillation frequency is smaller than the oscillation frequency at the time of constant tuning, and thus the control unit 20 controls the local oscillator 22 so that the oscillation frequency is α. After increasing by, return to step 320 and check the level of the AFT signal again (steps 330 to 340).

AFT신호의 레벨이 6보다 작으면 제어부(20)는 국부발진기(22)를 제어하여 발진주파수가 α만큼 감소되게 한 후 320단계로 복귀하여 다시 AFT신호의 레벨을 검사한다.(330∼350단계)If the level of the AFT signal is less than 6, the control unit 20 controls the local oscillator 22 to reduce the oscillation frequency by α, and then returns to step 320 to check the level of the AFT signal again (steps 330 to 350). )

상술한 바와 같이 동기신호를 검출하기 위한 거칠은 탐색과정과 정동조상태를 검출하기 위한 세밀한 탐색과정을 병행시킴으로서 채널탐색이 수행된다.As described above, the channel search is performed by combining the coarse search process for detecting the synchronization signal and the fine search process for detecting the tuned state.

그런데, 수신채널의 영상반송파에 근접하는 주파수를 갖는 신호에 의해 혼변조되는 경우에는 수직동기신호가 검출되더라도 중간주파회로(14)로부터 정상적인 AFT신호가 발생되지 않으므로 정동조가 되지 않고 320∼350단계를 반복하여 수행하는 이른바 맴돌이현상이 발생하여 정동조상태에 도달하지 못하게 된다.However, when intermodulation is performed by a signal having a frequency close to the image carrier of the reception channel, even if a vertical synchronization signal is detected, normal AFT signals are not generated from the intermediate frequency circuit 14, and thus, steps 320 to 350 are not adjusted. The so-called eddy phenomenon that is repeatedly performed does not reach the tuning condition.

제4도는 본 발명에 의한 채널탐색방법을 보이는 흐름도이다. 본 발명에 의한 채널탐색방법에서는 맴돌이 현상이 발생하더라도 미세동조시의 탐색횟수를 계수하여 일정횟수 이상이면 당해 채널을 탈출하도록 하는 것을 특징으로 한다. 제4도에 있어서 400단계 내지 450단계는 제3도의 300단계 내지 350단계와 동일하므로 설명의 편의상 상세한 기술을 생략한다.4 is a flowchart showing a channel searching method according to the present invention. In the channel search method according to the present invention, even if a circumference occurs, the number of searches for fine tuning is counted so that the channel is escaped if a predetermined number or more. In FIG. 4, steps 400 to 450 are the same as steps 300 to 350 of FIG. 3, and thus detailed descriptions are omitted for convenience of description.

360단계에서는 세밀한 탐색과정에서의 탐색횟수를 계수한다. 계수치가 소정치(여기서는 16)보다 작으면 420단계로 복귀하여 세밀한 탐색과정을 계속한다.(470단계)In step 360, the number of searches in the detailed search process is counted. If the count value is smaller than the predetermined value (here 16), the process returns to step 420 to continue the detailed search process (step 470).

계수치가 소정치보다 크면 탐색간격을 γ(αγβ)로 설정한 후 410단계로 복귀시켜 거칠은 탐색과정으로 복귀시킨다.(480∼490단계)If the count value is larger than the predetermined value, the search interval is set to γ (αγβ), and the process returns to step 410 to return to the coarse search process (steps 480 to 490).

즉, 세밀한 탐색과정에서의 탐색횟수가 일정치 이상이면 세밀한 탐색과정을 탈출시켜 거칠은 탐색과정으로 복귀시켜 맴돌이 현상이 발생하는 영역을 벗어나게 하는 것이다.In other words, if the number of searches in the detailed search process is more than a certain value, the detailed search process is escaped to return to the rough search process and out of the area where the circumference occurs.

상술한 바와 같이 본 발명에 의한 채널탐색방법은 미세동조시의 탐색횟수가 일정치이상이 되면 국부발진주파수를 큰 간격으로 변동시킴으로써 맴돌이 현상에 대응할 수 있는 효과를 갖는다.As described above, the channel searching method according to the present invention has an effect of coping with the eddy phenomenon by varying the local oscillation frequency at large intervals when the number of times of fine tuning is greater than a predetermined value.

Claims (1)

국부발진기의 발진주파수를 순차적으로 변동시키면서 동기신호의 발생여부를 검사하는 거칠은 탐색과정과 동기신호가 발생하면 좁은 간격으로 변동시키면서 정튜닝상태에 도달시키는 세밀한 탐색과정을 구비하는 채널탐색과정에 있어서, 상기 세밀한 탐색과정은 상기 발진주파수의 변동횟수를 계수하는 과정; 및 상기 계수치가 소정의 값을 초과하면 상기 거칠은 탐색과정으로 복귀시키는 과정을 포함함을 특징으로 하는 채널탐색방법.In the channel search process, which has a rough search process that checks whether the synchronization signal is generated while sequentially changing the oscillation frequency of the local oscillator, and a fine search process that reaches the fine tuning state with a narrow interval when the synchronization signal is generated. The detailed search process may include: counting a frequency of variation of the oscillation frequency; And returning to the coarse searching process when the count value exceeds a predetermined value.
KR1019940011770A 1994-05-28 1994-05-28 Tv receiver channel searching method KR0160660B1 (en)

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