KR20080003532A - Tuner - Google Patents

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Publication number
KR20080003532A
KR20080003532A KR1020060061900A KR20060061900A KR20080003532A KR 20080003532 A KR20080003532 A KR 20080003532A KR 1020060061900 A KR1020060061900 A KR 1020060061900A KR 20060061900 A KR20060061900 A KR 20060061900A KR 20080003532 A KR20080003532 A KR 20080003532A
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South Korea
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signal
video signal
demodulation
video
outputs
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KR1020060061900A
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Korean (ko)
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김광복
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엘지이노텍 주식회사
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Priority to KR1020060061900A priority Critical patent/KR20080003532A/en
Publication of KR20080003532A publication Critical patent/KR20080003532A/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/12—Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
    • 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
    • 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)
  • Processing Of Color Television Signals (AREA)

Abstract

A tuner is provided to pass the carrier wave signal of a picture signal level and output attenuatedly the carrier wave signal of a color signal level when a carrier wave signal of similar broadcasting modes with different frequency properties is inputted, thereby improving the SNR(Signal to Noise Ratio) of a video signal and sensitivity performance, improve noise removal capacity, and especially improve ringing noise sensitive to a color level. An MOPLL(Mixer Oscillator Phase Locked Loop) IC(Integrated Circuit)(21) mixes inputted and synchronized carrier wave signals and outputs the IF(Intermediate Frequency) signal of a desired channel. An SAW(Surface Acoustic Wave) filter(22) removes an unnecessary IF signal from the IF signal outputted from the MOPLL IC and outputs a desired IF signal. A demodulation IC(23) demodulates the IF signal inputted from the SAW filter into a video signal and an audio signal. A first composition video signal circuit(25) outputs a composite video signal from the video/audio signals outputted from the demodulation IC. A second composition video signal circuit(26) outputs a desired composite video signal from the video/audio signals outputted from the demodulation IC. A switching unit(24) outputs the video/audio signals outputted through the demodulation IC as a first demodulation video signal if the inputted carrier wave signal is in a PAL(Phase Alternation by Line system) or SECAM-L(French Sequential Couleur A Memoire) mode and outputs the video/audio signals as a second demodulation video signal through the demodulation IC if the inputted carrier wave signal is in an SECAM-L mode.

Description

튜너{TUNER}Tuner {TUNER}

도 1은 종래 튜너의 블럭도1 is a block diagram of a conventional tuner

도 2는 종래 튜너의 입출력 신호 파형도2 is a waveform diagram of input and output signals of a conventional tuner.

도 3은 본 발명 튜너의 블럭도3 is a block diagram of the present tuner.

도 4는 본 발명 튜너의 입출력 신호 파형도4 is an input / output signal waveform diagram of the tuner of the present invention.

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

21; 엠오피엘엘 집적회로 22; 소우필터21; MOPEL integrated circuit 22; Sow Filter

23; 복조집적회로 24; 스위치부23; Demodulation integrated circuit 24; Switch

25; 제 1 복합영상신호회로 26; 제 2 복합영상신호회로25; A first composite video signal circuit 26; Second composite video signal circuit

RC-LPF; RC 저역통과필터       RC-LPF; RC low pass filter

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

일반적으로 튜너는 안테나를 통해 RF 신호(무선 주파수 신호)를 입력받아 IF 신호(중간 주파수 신호)로 변환 후 이를 검파하여 비디오 신호와 오디오 신호로 분리하여 출력하는 장치로서, 상기 튜너는 안테나를 통해 수신되는 RF 신호가 와이드 밴드이기 때문에 수신 밴드를 VHF 밴드와, UHF 밴드로 나누어 신호를 선국하는 방식을 사용하고 있다.In general, a tuner receives an RF signal (radio frequency signal) through an antenna, converts it into an IF signal (intermediate frequency signal), detects the detected signal, and separates the video signal into an audio signal and outputs the tuner. Since the RF signal is a wide band, the reception band is divided into a VHF band and a UHF band to select a signal.

현재 세계 각국의 표준 텔레비젼 방식은 통일되어 있지 않아 각 국에 따라 주사선수나 필드수 등이 상이하며, 컬러 텔레비젼 방식은 크게 NTSC, PAL, SECAM으로 나뉘고, 또한 영상 중간주파수나 음성 중간주파수 등의 상위에 따라 NTSC는 NTSC-M, NTSC-JPN으로 나뉘며, PAL은 PAL-B/G, PAL-D/K, PAL-I로 나뉘고, SECAM은 SECAM-L, SECAM-L'로 나뉜다.Currently, the standard TV system of each country is not unified, so the number of players and fields varies according to each country. The color TV system is largely divided into NTSC, PAL, SECAM, and also above the middle of video and audio. Therefore, NTSC is divided into NTSC-M, NTSC-JPN, PAL is divided into PAL-B / G, PAL-D / K, PAL-I, and SECAM is divided into SECAM-L and SECAM-L '.

상기 튜너의 경우 사용주파수가 유사한 방식(PAL, SECAM-L)별로 튜너부 및 복조부를 공용으로 사용하게 된다.In the case of the tuner, the tuner unit and the demodulator unit are commonly used for each similar method (PAL, SECAM-L).

이와 같이 유사한 방식별로 공용으로 사용하는 튜너부 및 복조부는 도 2의(a)에 도시한 바와 같이, PAL, SECAM-L 방식의 픽쳐(P), 컬러(C), 사운드(S) 반송파신호가 입력되는 경우, 상기 입력 동조된 픽쳐(P), 컬러(C), 사운드(S)신호는 도1의 엠오피엘엘 집적회로(11)를 통해서 원하는 채널에 해당하는 중간주파수를 출력하게 되고, 상기 중간주파수는 소우필터(12)를 통해서 불필요한 주파수를 제거한 중간주파수를 출력하게 된다.As shown in (a) of FIG. 2, the tuner unit and the demodulator unit which are commonly used for each similar method are used for PAL, SECAM-L type picture P, color C, and sound S signal. When input, the input-tuned picture (P), color (C), and sound (S) signals output an intermediate frequency corresponding to a desired channel through the MLP integrated circuit 11 of FIG. The intermediate frequency outputs the intermediate frequency from which unnecessary frequencies are removed through the filter 12.

상기 중간주파수는 복조집적회로(13)에 입력되어 복조집적회로(13)를 통해서 영상신호와 음성신호로 복조되고, 상기 복조된 영상과 음성신호는 복합영상신호회로(14)를 통해서 영상신호인 픽쳐(P), 컬러(C)의 복합 영상신호를 출력하게 된다.The intermediate frequency is input to the demodulation integrated circuit 13 and demodulated into a video signal and an audio signal through the demodulation integrated circuit 13, and the demodulated video and audio signals are video signals through the composite video signal circuit 14. The composite image signal of the picture P and the color C is output.

그러나 SECAM-L' 방식의 사운드(S), 컬러(C), 픽쳐(P) 반송파 신호가 입력되는 경우, 도 2의 (b)에 도시한 바와 같이, 상기 사운드(S), 컬러(C), 픽쳐(P)신호 는 엠오피엘엘 집적회로(11), 소우필터(12), 복조집적회로(13) 및 복합영상신호회로(14)를 통해서 상기 PAL, SECAM-L 방식의 픽쳐(P), 컬러(C)신호와 서로 반대의 컬러(C), 픽쳐(P)신호가 출력되게 된다.However, when the sound (S), color (C), picture (P) carrier signal of the SECAM-L 'method is input, as shown in (b) of FIG. 2, the sound (S), color (C). , Picture (P) signal is the PAL, SECAM-L type picture (P) through the MOPEL integrated circuit 11, the saw filter 12, the demodulation integrated circuit 13 and the composite video signal circuit 14 The color (C) and picture (P) signals opposite to the color (C) signal are output.

이와 같이 유사한 방식별로 공용으로 사용하게 되는 경우 상기 PAL 방식을 기준으로 하는 튜너의 경우, SECAM-L' 방식의 반송파신호는 상기 복합영상신호회로(14)를 통해서 상기 PAL, SECAM-L 방식의 복합영상신호와는 반대로 출력되게 된다.As described above, in case of using similarly for each similar method, in the case of a tuner based on the PAL method, a carrier signal of SECAM-L 'method is combined with the PAL and SECAM-L method through the composite video signal circuit 14. In contrast to the video signal is output.

그러므로 상기 SECAM-L' 방식의 반송파신호는 원하는 복합영상신호와 반대인 픽쳐(P)신호레벨보다 컬러(C)신호레벨이 더 크게 출력되게 되므로, 비디오 성능 저하는 물론, 컬러신호레벨이 커서 화상에 노이즈가 발생되며, 또한 과변조시에는 포화현상이 발생하여 비디오 성능에 심각한 문제점이 있다.Therefore, the SECAM-L 'carrier signal outputs a larger color (C) signal level than the picture (P) signal level opposite to the desired composite video signal. Noise is generated in the video signal and saturation occurs during overmodulation, which seriously affects the video performance.

본 발명은 입력되는 반송파신호에 대하여 원하는 복합영상신호를 얻고자 하는 데 있다.The present invention is to obtain a desired composite video signal for the input carrier signal.

본 발명의 튜너는 입력 동조된 반송파신호를 혼합하여 원하는 채널의 중간주파수를 출력하는 엠오피엘엘 집적회로와; 상기 엠오피엘엘 집적회로에서 출력되는 중간주파수에 불필요한 중간주파수를 제거하여 원하는 중간주파수를 출력하는 소우필터와; 상기 소우필터에서 출력되어 입력되는 중간주파수를 영상신호와 음성신호로 복조하여 출력하는 복조집적회로와; 상기 복조집적회로로부터 출력되는 영상, 음성신호에서 복합영상신호를 출력하는 제 1 복합영상신호회로와; 상기 복조집적회로부터 출력되는 영상, 음성신호에서 원하는 복합영상신호로 출력하는 제 2 복합영상신호회로; 및 상기 입력된 반송파신호가 PAL, SECAM-L 방식이면 상기 복조집적회로를 통해서 출력되는 영상,음성신호를 상기 제 1복조영상신호로 출력하고, 상기 입력되는 반송파신호가 SECAM-L' 방식이면 상기 복조집적회로를 통해서 영상,음성신호를 상기 제 2 복합영상신호로 출력하는 스위치부를 포함한다. The tuner of the present invention comprises an MOPEL integrated circuit for outputting the intermediate frequency of the desired channel by mixing the input-tuned carrier signal; A saw filter for outputting a desired intermediate frequency by removing an unnecessary intermediate frequency from the intermediate frequency output from the MOPEL integrated circuit; A demodulation integrated circuit for demodulating and outputting an intermediate frequency output from the saw filter into a video signal and an audio signal; A first composite video signal circuit for outputting a composite video signal from an image and an audio signal output from the demodulation integrated circuit; A second composite video signal circuit outputting a desired composite video signal from an image and an audio signal output from the demodulation assembly; And outputting the video and audio signal output through the demodulation integrated circuit as the first demodulated video signal when the input carrier signal is PAL or SECAM-L method, and when the input carrier signal is SECAM-L 'method. And a switch unit configured to output a video and audio signal as the second composite video signal through a demodulation integrated circuit.

상기 제 2 복합영상신호회로는 입력되는 영상신호 레벨을 반대로 출력한다.The second composite video signal circuit outputs the input video signal level in reverse.

상기 제 2 복합영상신호회로는 RC 저역통과필터를 포함한다.The second composite video signal circuit includes an RC low pass filter.

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 발명 튜너의 블럭도 이고, 도 4는 본 발명 튜너의 입출력 신호 파형도 로서, 본 발명은 엠오피엘엘 집적회로(21), 소우필터(22), 복조집적회로(23), 스위치부(24), 제 1 복합영상신호회로(25), 제 2 복합영상신호회로(26)로 구성된다.FIG. 3 is a block diagram of the tuner of the present invention, and FIG. 4 is an input / output signal waveform diagram of the tuner of the present invention. The present invention is an MLPEL integrated circuit 21, a saw filter 22, a demodulation integrated circuit 23, and a switch. The unit 24 includes a first composite video signal circuit 25 and a second composite video signal circuit 26.

상기 엠오피엘엘 집적회로(21)는 입력 동조된 반송파신호를 기준주파수와 혼합하여 선택된 채널에 해당하는 중간주파수를 출력하며, 내부에 믹서(Mixer), 발진기(Oscillator), 위상동기루프(PLL)가 집적 구성된다.The MLP integrated circuit 21 mixes the input tuned carrier signal with a reference frequency and outputs an intermediate frequency corresponding to the selected channel, and has a mixer, an oscillator, and a phase synchronization loop (PLL) therein. Is integrated.

상기 소우필터(22)는 상기 엠오피엘엘 집적회로(21)에서 출력된 중간주파수로부터 불필요한 주파수를 제거하여 원하는 중간주파수를 출력하며 통상적으로 대역통과필터로 구현될 수 있다.The saw filter 22 outputs a desired intermediate frequency by removing unnecessary frequencies from the intermediate frequency output from the MLP integrated circuit 21 and may be generally implemented as a band pass filter.

상기 복조집적회로(23)는 상기 소우필터(22)로부터 출력되어 입력되는 중간 주파수에 대하여 영상과 음성신호를 복조하여 출력하게 되며, 내부에 증폭기, 영상검파기, 영상제거필터, 에프엠 검파기로 구성된다.The demodulation integrated circuit 23 demodulates and outputs an image and an audio signal with respect to an intermediate frequency output from the saw filter 22. The demodulation integrated circuit 23 includes an amplifier, an image detector, an image removal filter, and an FM detector. .

상기 스위치부(24)는 별도의 제어신호에 의하여 절환 동작하고 상기 복조집적회로(23)에서 출력되는 영상과 음성신호를 출력한다.The switch unit 24 switches by a separate control signal and outputs a video and audio signal output from the demodulation integrated circuit 23.

상기 제 1 복합영상신호회로(25)는 상기 스위치부(24)로부터 입력되는 영상 및 음성신호에 대하여 영상신호만을 출력하게 된다.The first composite video signal circuit 25 outputs only a video signal with respect to the video and audio signals input from the switch unit 24.

상기 제 2 복합영상신호회로(26)는 상기 스위치부(24)로부터 입력되는 영상 및 음성신호에서 영상신호를 RC 저역통과필터(RC-LPF)를 통해서 반대로 출력한다.The second composite video signal circuit 26 reversely outputs a video signal from the video and audio signals input from the switch unit 24 through the RC low pass filter RC-LPF.

상기와 같이 구성되는 본 발명은 입력 동조된 픽쳐(P), 컬러(C), 사운드(S) 반송파신호는 엠오피엘엘 집적회로(21)를 통해서 원하는 채널에 해당하는 중간주파수를 출력하게 되고, 상기 중간주파수는 소우필터(22)를 통해서 불필요한 주파수를 제거한 중간주파수를 출력하게 된다.In the present invention configured as described above, the input-tuned picture (P), color (C), and sound (S) carrier signal outputs an intermediate frequency corresponding to a desired channel through the MOPEL integrated circuit 21, The intermediate frequency outputs an intermediate frequency from which unnecessary frequencies are removed through the saw filter 22.

상기 중간주파수는 복조집적회로(23)에 입력되어 복조집적회로(23)를 통해서 영상신호와 음성신호로 복조되어 출력되게 된다.The intermediate frequency is input to the demodulation integrated circuit 23 and demodulated into a video signal and an audio signal through the demodulation integrated circuit 23.

이때 도 4의 (a)에 도시한 바와 같이, 상기 입력 동조된 반송파신호가 PAL, SECAM-L 방식의 픽쳐(P), 컬러(C), 사운드(S) 반송파 신호인 경우, 상기 스위치부(24)에는 별도의 제어신호가 인가되지 않게 되어, 상기 복조집적회로(23)로부터 출력되는 영상신호와 음성신호에서 영상신호가 제 1 복합영상신호회로(25)를 통해서 입력된 픽쳐(P), 컬러(C)의 복합영상신호로 출력되게 된다. In this case, as shown in FIG. 4A, when the input-tuned carrier signal is a PAL, SECAM-L picture P, color C, or sound S signal, the switch unit ( 24, a separate control signal is not applied, and the picture signal inputted from the video signal and the audio signal output from the demodulation integrated circuit 23 through the first composite video signal circuit 25, P, The composite image signal of the color C is output.

반면에, 상기 입력 동조된 반송파신호가 SECAM-L' 방식의 사운드(S), 컬 러(C), 픽쳐(P) 반송파 신호인 경우, 도 4의 (b)에 도시한 바와 같이, 상기 스위치부(24)에는 별도의 제어신호가 인가되어 상기 스위치부(24)가 제 2 복합영상신호회로(26)로 절환 접속되게 된다.On the other hand, when the input tuned carrier signal is a sound (S), color (C), picture (P) carrier signal of the SECAM-L 'method, as shown in (b) of FIG. A separate control signal is applied to the unit 24 so that the switch unit 24 is switched to the second composite video signal circuit 26.

그러므로 상기 복조집적회로(23)로부터 출력되는 영상신호와 음성신호에서 상기 영상신호가 제 2 복합영상신호회로(26) 내부에 구비된 RC 저역통과필터(RC-LPF)를 통해서 입력된 컬러(C), 픽쳐(P)신호에서 픽쳐(P)신호 보다 높은 컬러(C)신호는 제한하고, 반면에 픽쳐(P)신호는 통과하여 상기 입력된 컬러(C), 픽쳐(P)신호 레벨의 크기와 반대인 픽쳐(P)신호가 증가되고, 컬러(C)는 감쇄된 복합영상신호를 출력하게 된다. Therefore, in the video signal and the audio signal output from the demodulation integrated circuit 23, the video signal is inputted through the RC low pass filter RC-LPF provided in the second composite video signal circuit 26. ), The color (C) signal higher than the picture (P) signal in the picture (P) signal is limited, while the picture (P) signal passes through to the magnitude of the input color (C) and picture (P) signal levels. The picture P signal opposite to that is increased, and the color C outputs the attenuated composite video signal.

이상에서 설명한 바와 같이 본 발명은 주파수특성이 다른 유사한 방송방식의 반송파가 입력되는 경우, 픽쳐신호 레벨은 통과하고 컬러신호 레벨은 감쇄 출력되게 함으로써, 영상신호 잡음비 및 감도 성능이 우수하고, 노이즈 제거 능력이 향상하며, 특히 컬러 레벨에 민감하게 반응하는 링잉 노이즈를 개선할 수 있게 된다.As described above, according to the present invention, when a carrier of a similar broadcasting system having different frequency characteristics is input, the picture signal level passes and the color signal level is attenuated. This improves, and in particular, the ringing noise which is sensitive to the color level.

Claims (3)

입력 동조된 반송파신호를 혼합하여 원하는 채널의 중간주파수를 출력하는 엠오피엘엘 집적회로와; 상기 엠오피엘엘 집적회로에서 출력되는 중간주파수에 불필요한 중간주파수를 제거하여 원하는 중간주파수를 출력하는 소우필터와; 상기 소우필터에서 출력되어 입력되는 중간주파수를 영상신호와 음성신호로 복조하여 출력하는 복조집적회로와; 상기 복조집적회로로부터 출력되는 영상, 음성신호에서 복합영상신호를 출력하는 제 1 복합영상신호회로와; 상기 복조집적회로부터 출력되는 영상, 음성신호에서 원하는 복합영상신호로 출력하는 제 2 복합영상신호회로; 및 상기 입력된 반송파신호가 PAL, SECAM-L 방식이면 상기 복조집적회로를 통해서 출력되는 영상,음성신호를 상기 제 1복조영상신호로 출력하고, 상기 입력되는 반송파신호가 SECAM-L' 방식이면 상기 복조집적회로를 통해서 영상,음성신호를 상기 제 2 복합영상신호로 출력하는 스위치부를 포함하는 튜너.An MOPEL integrated circuit for mixing an input tuned carrier signal and outputting an intermediate frequency of a desired channel; A saw filter for outputting a desired intermediate frequency by removing an unnecessary intermediate frequency from the intermediate frequency output from the MOPEL integrated circuit; A demodulation integrated circuit for demodulating and outputting an intermediate frequency output from the saw filter into a video signal and an audio signal; A first composite video signal circuit for outputting a composite video signal from an image and an audio signal output from the demodulation integrated circuit; A second composite video signal circuit outputting a desired composite video signal from an image and an audio signal output from the demodulation assembly; And outputting the video and audio signal output through the demodulation integrated circuit as the first demodulated video signal when the input carrier signal is PAL or SECAM-L method, and when the input carrier signal is SECAM-L 'method. And a switch unit configured to output a video and audio signal as the second composite video signal through a demodulation integrated circuit. 제 1 항에 있어서, 상기 제 2 복합영상신호회로는 입력되는 영상신호 레벨을 반대로 출력하는 것을 특징으로 하는 튜너.The tuner according to claim 1, wherein the second composite video signal circuit outputs the input video signal level in reverse. 제 1 항에 있어서, 상기 제 2 복합영상신호회로는 RC 저역통과필터를 포함하는 튜너.The tuner of claim 1, wherein the second composite video signal circuit comprises an RC low pass filter.
KR1020060061900A 2006-07-03 2006-07-03 Tuner KR20080003532A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101519369B1 (en) * 2009-02-12 2015-05-21 엘지이노텍 주식회사 Tuner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101519369B1 (en) * 2009-02-12 2015-05-21 엘지이노텍 주식회사 Tuner

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