KR20080066490A - Tuner for pip - Google Patents

Tuner for pip Download PDF

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Publication number
KR20080066490A
KR20080066490A KR1020070003986A KR20070003986A KR20080066490A KR 20080066490 A KR20080066490 A KR 20080066490A KR 1020070003986 A KR1020070003986 A KR 1020070003986A KR 20070003986 A KR20070003986 A KR 20070003986A KR 20080066490 A KR20080066490 A KR 20080066490A
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South Korea
Prior art keywords
tuner
balun
sub
main
pip
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KR1020070003986A
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Korean (ko)
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박일희
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엘지이노텍 주식회사
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Priority to KR1020070003986A priority Critical patent/KR20080066490A/en
Publication of KR20080066490A publication Critical patent/KR20080066490A/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • H03J1/0058—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with channel identification means
    • H03J1/0083—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with channel identification means using two or more 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
    • H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
    • H04N5/45—Picture in picture, e.g. displaying simultaneously another television channel in a region of the screen
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J2200/00—Indexing scheme relating to tuning resonant circuits and selecting resonant circuits
    • H03J2200/17—Elimination of interference caused by harmonics of local oscillator

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

A tuner for PIP(Picture In Picture) is provided to enable an insulating unit to intercept an oscillation signal generated in an oscillator to be flowed into different channels through a balun when channel signals inputted to a main tuner and a sub tuner through the balun are converted into IF(Intermediate Frequency) signals, thereby providing the screen of good quality. An LNA(Low Noise Ampifier) amplifies multi-channel signals inputted from an antenna. A balun distributes plural channel signal of the multi-channel signals amplified in the LNA. A main tuner(21) receives a main channel signal of the plural channel signals distributed through the balun. A sub tuner(22) receives a sub channel signal. An insulating unit(23) which includes buffer circuits(231,232) intercepts the interference of the distributed signals among the balun, the main tuner, and the sub tuner.

Description

피아이피용 튜너{TUNER FOR PIP}Tuner for PIP {TUNER FOR PIP}

도 1은 종래 PIP용 튜너의 개략적인 블록도1 is a schematic block diagram of a conventional PIP tuner

도 2는 종래 PIP용 튜너의 발룬 절연측정 파형도2 is a waveform diagram of a balun insulation measurement of a conventional PIP tuner

도 3은 본 발명의 일실시예에 따른 PIP용 튜너의 블럭도3 is a block diagram of a tuner for PIP according to an embodiment of the present invention;

도 4는 본 발명의 일실시예에 따른 PIP용 튜너의 발룬 절연측정 파형도4 is a balun insulation measurement waveform diagram of a tuner for PIP according to an embodiment of the present invention

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

LNA; 저잡음증폭기 BALUN; 발룬LNA; Low noise amplifier BALUN; Balloon

21; 메인튜너 22;서브튜너21; Main tuner 22; Sub tuner

23; 절연수단 231,232; 버퍼회로23; Insulation means 231,232; Buffer circuit

본 발명은 PIP용 튜너에 관한 것이다.The present invention relates to a tuner for a PIP.

일반적으로 PIP용 튜너는 안테나로부터 입력되는 다채널신호에 대하여 하나의 화면상에 복수의 채널신호를 디스플레이하는 튜너로서, 상기 복수의 채널신호를 디스플레이하기 위해서는 복수의 튜너 즉 메인튜너와 서브튜너를 구비하게 된다.In general, a PIP tuner displays a plurality of channel signals on one screen with respect to a multi-channel signal input from an antenna, and includes a plurality of tuners, that is, a main tuner and a sub tuner, to display the plurality of channel signals. Done.

이와 같이 메인 튜너와 서브 튜너를 구비한 상기 PIP용 튜너는 도 1에 도시 한 바와 같이, 안테나로부터 입력되는 다채널신호를 저잡음 증폭기(LNA)를 통해서 증폭한 후, 상기 증폭된 다채널신호 중 복수의 채널신호를 발룬(BALUN)을 통해서 메인튜너(11)와 서브튜너(12)로 분배하게 되는데, 이때 주 채널신호는 메인튜너(11)에 입력하고, 부 채널신호는 서브튜너(12)에 각각 입력하게 된다.As described above, the PIP tuner including the main tuner and the sub tuner amplifies a multi-channel signal input from an antenna through a low noise amplifier (LNA), and then a plurality of the multi-channel signals amplified. The channel signal is distributed to the main tuner 11 and the sub tuner 12 through the balun. The main channel signal is input to the main tuner 11 and the sub channel signal is input to the sub tuner 12. Each will be entered.

상기 메인튜너(11)와 서브튜너(12)에 각각 입력된 주 채널신호와 부 채널신호는 상기 각각의 메인튜너(11)와 서브튜너(12)의 내부에 구비된 필터, 입력동조부, 고주파 증폭부 및 믹서를 통해서 발진주파수와 혼합한 후 중간주파수를 출력하고, 상기 중간주파수는 복조부를 통해서 원래의 방송신호로 복조하여 화면상에 주 채널신호와 부 채널신호를 각각 디스플레이하게 된다.The main channel signal and the sub channel signal input to the main tuner 11 and the sub tuner 12 are respectively provided with a filter, an input tuning unit, and a high frequency provided inside the main tuner 11 and the sub tuner 12. After mixing with the oscillation frequency through the amplifier and mixer, the intermediate frequency is output, and the intermediate frequency is demodulated to the original broadcast signal through the demodulator to display the main channel signal and the sub channel signal on the screen, respectively.

그러나, 상기 PIP용 튜너의 메인튜너(11)와 서브튜너(12)는 입력되는 주 채널신호와 부 채널신호를 발진기(OSC)에서 발생되는 발진주파수와 혼합하여 중간주파수로 변환할 때 상기 발진기(OSC)에서 발생되는 발진신호는 상기 발룬(BALUN)의 일측 출력단을 통하여 역방향으로 타측 출력단으로 유입되어 서로 다른 튜너로 유입되어 신호 간섭을 일으키게 된다.However, the main tuner 11 and the sub tuner 12 of the PIP tuner mix the input main channel signal and the sub channel signal with the oscillation frequency generated by the oscillator (OSC) and convert the oscillator ( The oscillation signal generated by OSC is introduced into the other output terminal in the reverse direction through one output terminal of the balun BALUN, and enters different tuners to cause signal interference.

특히 동일 채널 선곡시, 상기 채널 상호 간에 유입되는 발진신호에 의하여 신호간섭이 발생하여 화상에 세로 비트(BEAT)로 인해 양질의 화면을 제공할 수 없는 문제점이 있다.In particular, when the same channel is selected, signal interference occurs due to oscillation signals flowing between the channels, and thus a high quality screen cannot be provided due to vertical bits in the image.

이때 상기 발룬(BALUN)은 도 2에 도시한 바와 같이 주파수 대역에 따라 -19dB ~ -25dB 범위의 절연특성을 나타나게 된다.In this case, the balun BALUN exhibits insulation characteristics in the range of -19 dB to -25 dB depending on the frequency band as shown in FIG. 2.

본 발명은 PIP용 튜너의 채널 간에 신호 간섭을 차단한다.The present invention blocks signal interference between channels of the PIP tuner.

본 발명은 안테나로부터 입력되는 다채널신호를 증폭하는 저잡음 증폭기와; 상기 저잡음증폭기에서 증폭된 다채널신호중 복수의 채널신호를 분배하는 발룬과; 상기 발룬을 통해서 분배된 복수의 채널신호중 주 채널신호가 입력되는 메인튜너 및 부 채널신호가 입력되는 서브튜너를 포함하는 PIP용 튜너에 있어서, 상기 발룬과 메인튜너와 서브튜너 간에는 튜너의 발진신호가 발룬을 거쳐 서로 다른 채널로 유입되는 것을 차단하는 절연수단을 포함한다.The present invention provides a low noise amplifier for amplifying a multi-channel signal input from an antenna; A balun for distributing a plurality of channel signals among the multi-channel signals amplified by the low noise amplifier; In the PIP tuner including a main tuner to which the main channel signal is input and a sub tuner to which the sub channel signal is input among the plurality of channel signals distributed through the balun, the oscillation signal of the tuner is between the balun, the main tuner and the sub tuner. Insulation means for blocking the flow into the different channels through the balloon.

이하 첨부되는 도면에 의거 본 발명을 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 3은 본 발명의 일실시예에 따른 PIP용 튜너의 블럭도 이고, 도 4는 본 발명의 일실시예에 따른 PIP용 튜너의 발룬 절연측정 파형도 이다.Figure 3 is a block diagram of a tuner for PIP according to an embodiment of the present invention, Figure 4 is a balun insulation measurement waveform diagram of a tuner for PIP according to an embodiment of the present invention.

저잡음증폭기(LNA)는 안테나를 통해서 입력되는 다채널신호 들을 증폭하게 된다.The low noise amplifier (LNA) amplifies the multi-channel signals input through the antenna.

발룬(BALUN)은 입력되는 신호에 대하여 출력단에 평형-불평형 된 신호로 상호 변환하면서 분배 출력하게 된다.The balun BALUN distributes and outputs a signal which is converted into a balanced-unbalanced signal at the output terminal with respect to the input signal.

메인튜너(21)는 상기 발룬(BALUN)을 통해서 입력되는 주 채널신호를 발진기의 발진주파수와 혼합하여 중간주파수로 변환하고 복조기로 복조하여 주 화면에 출력하게 된다.The main tuner 21 converts the main channel signal input through the balun to the intermediate frequency by mixing with the oscillation frequency of the oscillator, demodulates it with a demodulator and outputs it to the main screen.

서브튜너(22)는 상기 발룬(BALUN)을 통해서 입력되는 부 채널신호를 발진기의 발진주파수와 혼합하여 중간주파수로 변환하고 복조기로 복조하여 부 화면으로 출력하게 된다.The sub-tuner 22 converts the sub channel signal inputted through the balun to the intermediate frequency by mixing the oscillation frequency of the oscillator and demodulates the demodulator with the demodulator and outputs the sub screen.

절연수단(23)은 상기 발룬(BALUN)의 출력단과 상기 메인튜너(21)와 서브튜너(22)의 입력단 사이에 구현하여, 상기 메인튜너(21)와 서브튜너(22)에서 발생되는 발진신호가 상기 발룬(BALUN)을 통해서 서로 다른 채널로 유입되는 것을 차단하게 된다.The insulation means 23 is implemented between the output terminal of the balun BALUN and the input terminals of the main tuner 21 and the sub tuner 22 to generate an oscillation signal generated by the main tuner 21 and the sub tuner 22. Blocks the inflow into different channels through the balun.

상기 절연수단(23)은 역방향 흐름을 차단하는 버퍼회로(BUFFER)(231)(232)로 각각 구성하게 되고, 상기 각각의 버퍼회로는 트랜지스터 또는 연산증폭기 중 어느 하나로 구성하게 된다.The insulating means 23 is composed of buffer circuits (BUFFERs) 231 and 232 which block reverse flow, and each of the buffer circuits is composed of any one of a transistor and an operational amplifier.

상기와 같이 구성되는 본 발명은 안테나를 통해서 입력되는 다채널신호를 저잡음 증폭기(LNA)로 증폭한 후, 상기 증폭된 다채널신호 중 복수의 채널신호를 발룬(BALUN)을 통해서 상기 복수의 채널신호를 역방향으로 신호 흐름을 차단하는 절연수단(23)의 각각의 버퍼회로(231)(232)를 통해서 메인튜너(21)에는 주 채널신호를, 서브튜너(22)에는 부 채널신호를 각각 입력하게 된다.According to the present invention configured as described above, after amplifying a multi-channel signal input through an antenna with a low noise amplifier (LNA), a plurality of channel signals among the amplified multi-channel signals through a balun (BALUN) The main channel signal is input to the main tuner 21 and the sub channel signal is input to the sub tuner 22 through the respective buffer circuits 231 and 232 of the isolation means 23 which blocks the signal flow in the reverse direction. do.

상기 메인튜너(21)와 서브튜너(22)에서 입력되는 주 채널신호와 부 채널신호를 발진기의 발진주파수와 혼합하여 중간주파수를 변환하고, 상기 변환된 중간주파수는 복조부에서 복조되어 각각의 주 채널신호와 부 채널신호를 화면에 디스플레이하게 된다.The intermediate frequency is converted by mixing the main channel signal and the sub channel signal input from the main tuner 21 and the sub tuner 22 with the oscillation frequency of the oscillator, and the converted intermediate frequency is demodulated by a demodulator to demodulate each main frequency. The channel signal and the sub channel signal are displayed on the screen.

이때 상기 메인튜너(21)와 서브튜너(22)에 입력된 주 채널신호와 부 채널신호는 상기 중간주파수로 변환하는 과정에서 상기 발진기로부터 발진주파수인 발진신호가 발생하게 되지만, 상기 발생된 발진신호는 상기 절연수단(23)의 버퍼회 로(231)(232)에 의하여 역방향 즉 상기 발룬(BALUN)으로 유입되는 것을 차단하게 되어 상기 메인튜너(21)와 서브튜너(22)는 신호 간섭을 받지 않게 된다.At this time, the main channel signal and the sub channel signal inputted to the main tuner 21 and the sub tuner 22 generate an oscillation signal which is an oscillation frequency from the oscillator during the conversion to the intermediate frequency, but the generated oscillation signal Blocks the inflow into the balun (BALUN) in the reverse direction by the buffer circuit (231, 232) of the insulating means 23, the main tuner 21 and the sub-tuner 22 is not subjected to signal interference Will not.

여기서 상기 발룬(BALUN)은 도 4에 도시한 바와 같이, 전체 주파수 대역에 따라 -27dB ~ -36dB 범위의 절연특성이 나타나게 된다. 즉 도 2의 발룬(BALUN)의 절연특성을 비교하여 볼 때, 상기 절연수단(23)에 의하여 양호한 절연 특성을 나타나게 되므로, 상기 메인튜너(21)와 서브튜너(22)에는 서로 다른 채널로부터 신호 간섭을 받지 않게 되어 양질의 화면을 디스플레이하게 된다.As shown in FIG. 4, the balun BALUN exhibits insulation characteristics in the range of -27 dB to -36 dB depending on the entire frequency band. In other words, when comparing the insulation characteristics of the balun (BALUN) of Figure 2, since the insulating means 23 exhibits a good insulation characteristics, the main tuner 21 and the sub-tuner 22, the signal from different channels There is no interference, and a good screen is displayed.

이상에서 설명한 바와 같이 본 발명은 발룬을 통해서 메인튜너와 서브튜너에 입력된 채널신호를 중간주파수로 변환시 발진기에서 발생되는 발진신호가 절연수단에 의하여 상기 발룬을 통해서 서로 다른 채널로 유입되는 것을 차단함으로써, 상기 신호 간섭을 방지하게 되어 양질의 화면을 제공하게 된다.As described above, according to the present invention, when the channel signals input to the main tuner and the sub tuner through the balun are converted into intermediate frequencies, the oscillation signals generated from the oscillator are blocked by the insulating means from being introduced into different channels through the balun. Therefore, the signal interference is prevented to provide a high quality screen.

Claims (4)

안테나로부터 입력되는 다채널신호를 증폭하는 저잡음 증폭기와; 상기 저잡음증폭기에서 증폭된 다채널신호중 복수의 채널신호를 분배하는 발룬과; 상기 발룬을 통해서 분배된 복수의 채널신호중 주 채널신호가 입력되는 메인튜너 및 부 채널신호가 입력되는 서브튜너를 포함하는 PIP용 튜너에 있어서, 상기 발룬과 상기 메인튜너와 서브튜너 사이에 분배 신호의 간섭을 차단하는 절연수단을 포함하는 것을 특징으로 하는 PIP용 튜너.A low noise amplifier for amplifying a multichannel signal input from an antenna; A balun for distributing a plurality of channel signals among the multi-channel signals amplified by the low noise amplifier; A PIP tuner comprising a main tuner to which a main channel signal is input and a sub tuner to which a sub channel signal is input among a plurality of channel signals distributed through the balun, wherein the divided signal is divided between the balun and the main tuner and the sub tuner. Tuner for PIP comprising an insulation means for blocking the interference. 제 1 항에 있어서, 상기 절연수단은 상기 발룬의 출력단과 상기 메인튜너와 서브튜너의 입력단 사이에 구성한 것을 특징으로 하는 PIP용 튜너.The tuner for PIP according to claim 1, wherein the insulation means is configured between an output end of the balun and an input end of the main tuner and the sub tuner. 제 1 항에 있어서, 상기 절연수단은 역방향 흐름을 차단하는 각각의 버퍼회로 구성한 것을 특징으로 하는 PIP용 튜너.2. The tuner for PIP according to claim 1, wherein said insulating means is configured for each buffer circuit to block reverse flow. 제 3 항에 있어서, 상기 버퍼회로는 트랜지스터 또는 연산증폭기 중 어느 하나로 구성한 것을 특징으로 하는 PIP용 튜너.4. The tuner for a PIP of claim 3, wherein the buffer circuit is formed of any one of a transistor and an operational amplifier.
KR1020070003986A 2007-01-12 2007-01-12 Tuner for pip KR20080066490A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110131389A (en) * 2010-05-31 2011-12-07 엘지이노텍 주식회사 Circuit for preventing interference of signal occurring between tuner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110131389A (en) * 2010-05-31 2011-12-07 엘지이노텍 주식회사 Circuit for preventing interference of signal occurring between tuner

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