KR920000812Y1 - Luminance signal compensation circuit of vtr - Google Patents

Luminance signal compensation circuit of vtr Download PDF

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KR920000812Y1
KR920000812Y1 KR2019890004235U KR890004235U KR920000812Y1 KR 920000812 Y1 KR920000812 Y1 KR 920000812Y1 KR 2019890004235 U KR2019890004235 U KR 2019890004235U KR 890004235 U KR890004235 U KR 890004235U KR 920000812 Y1 KR920000812 Y1 KR 920000812Y1
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vhs
signal
luminance
luminance signal
output
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KR2019890004235U
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KR900019575U (en
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이도수
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삼성전자 주식회사
강진구
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/79Processing of colour television signals in connection with recording
    • H04N9/80Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/64Circuits for processing colour signals
    • H04N9/65Circuits for processing colour signals for synchronous modulators
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/79Processing of colour television signals in connection with recording
    • H04N9/80Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/83Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal
    • H04N9/832Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal using an increased bandwidth for the luminance or the chrominance signal
    • H04N9/833Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal using an increased bandwidth for the luminance or the chrominance signal with selection of the conventional or the increased bandwidth signal, e.g. VHS or SVHS signal selection

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

내용 없음.No content.

Description

VTR의 휘도신호 보상회로VTR luminance signal compensation circuit

제1도는 비디오 신호의 기록 방식도.1 is a method of recording a video signal.

제2도는 본 고안에 따른 휘도신호 보상회로의 개요도.2 is a schematic diagram of a luminance signal compensation circuit according to the present invention.

제3도는 본 고안의 구체 회로도.3 is a detailed circuit diagram of the present invention.

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

Q1-Q5 : 트랜지스터 L1-L5 : 코일Q1-Q5: Transistor L1-L5: Coil

C1-C11 : 캐패시터 R1-R17 : 저항C1-C11: Capacitor R1-R17: Resistor

VR : 가변저항VR: Variable resistor

본 고안은 VTR(Video Tape Recorder)의 비디오 신호 기록에 관한 회로로서, 특히 휘도신호 기록계의 보상회로에 관한 것이다.The present invention relates to a video signal recording circuit of a video tape recorder (VTR), and more particularly to a compensation circuit of a luminance signal recorder.

일반적으로 비디오 신호의 기록 방식은 제1도와 같은 방식으로 이루어진다.In general, the recording method of the video signal is performed in the same manner as in FIG.

여기서 NTSC(National Television System Committee)칼러 텔레비젼 신호의 기록 방식을 살펴보면, NTSC의 복합 비디오신호(Composite Video Signal)는 휘도신호와 색신호로 분리된다. 먼저 VTR에서 상기 휘도신호는 전 반송파의 FM변조파로 변환되는데, 이때 비디오 신호의 백레벨 첨두치(white peak)및 동기 신호의 선단(syn c tip)에 상당하는 반송파의 주파수 선정은 신호대 잡음비(S/N)에 관계되는 중요한 의미를 가지고 있다. 상기 화이트 피크와 싱크 팁에 상당하는 반송파의 주파수차가 주파수 편이(frequency deviation)이며, 이주파수 편이는 다른 조건을 고려해서 될 수 있는 한 크게함으로서 S/N을 좋게 할수 있다. 왜냐하면 상기 주파수 편이는 복조한 후의 출력신호의 진폭에 비례하기 때문이다. VHS방식의 VTR에서는 화이트 피크를 4.4MHZ, 싱크팁을 3.4MHZ로 사용하므로 주파수 편이는 1MHZ가 된다.In the NTSC (National Television System Committee) color television signal recording method, the composite video signal of the NTSC is divided into a luminance signal and a color signal. First, in the VTR, the luminance signal is converted into an FM modulator of all carriers, wherein the frequency selection of the carriers corresponding to the white level peak of the video signal and the syn tip of the synchronization signal is performed using a signal-to-noise ratio (S). / N) has a significant meaning. The frequency difference of the carrier corresponding to the white peak and the sync tip is a frequency deviation, and this frequency shift can improve S / N by making it as large as possible considering other conditions. This is because the frequency shift is proportional to the amplitude of the output signal after demodulation. In the VHS VTR, the white peak is 4.4MHZ and the sync tip is 3.4MHZ, so the frequency shift is 1MHZ.

한편, 칼러신호(3.58MHZ±500KHZ)는 휘도신호보다 낮은 주파수로 변환되며 AM변조로 직접 기록된다. 이와같이 휘도신호에 대해 저역쪽으로 변환된 색신호를 저역 변환 색신호라고 부른다.On the other hand, the color signal (3.58MHZ ± 500KHZ) is converted to a frequency lower than that of the luminance signal and recorded directly with AM modulation. The color signal converted to the low frequency side with respect to the luminance signal in this way is called a low frequency converted color signal.

따라서 복합 비디오 신호가 인가되면, 휘도신호 기록계는 저역 여파기(1)를 통해 3MHZ이하의 휘도신호를 검출하고, FM변조기(2)를 통해 FM변조파로 변환하는데, 이때 화이트 피크는 4.4MHZ 싱크 팁은 3.4MHZ이므로 최대주파수 편이가 1.0MHZ인 범위내에서 FM변조한다. 상기 FM변조기(2)를 출력한 저반송파의 FM변조신호는 휘도 보상부(Y equalizer)(3)를 통해 휘도신호의 등화특성을 보상하여 출력한다. 이는 FM변조시 반송파와 상하의 측파대가 동시에 기록되는데, 그 사이에는 상호 작용이 존재하고 고주파 성분이 저주파 성분의 교류바이어스로 동작하게 되므로서, 이를 재생할시 저주파성분이 상기 바이어스 효과에 의해 고주파성분보다 높은 출력으로 재생된다. 따라서 상기 휘도 보상부(3)에서는 FM변조한 휘도신호를 기록할시 상측파대를 억압하고 하측파대를 강조하는 등화특성을 수행하여 재생시 본래의 신호를 재생할수 있도록 보상한다.Therefore, when a composite video signal is applied, the luminance signal recorder detects a luminance signal of 3 MHZ or less through the low pass filter 1 and converts it into an FM modulation wave through the FM modulator 2, wherein the white peak is 4.4MHZ sync tip. Since 3.4MHZ, FM modulation is performed within the range of 1.0MHZ. The low modulated FM modulated signal output from the FM modulator 2 is output by compensating equalization characteristics of the luminance signal through a luminance compensator (Y equalizer) 3. When FM modulation is performed, the carrier wave and the upper and lower side bands are simultaneously recorded, and there is an interaction between them, and the high frequency component acts as an AC bias of the low frequency component. Play at high output. Therefore, the luminance compensator 3 compensates for reproducing the original signal during reproduction by performing an equalization characteristic that suppresses the upper band and emphasizes the lower band when recording the FM-modulated luminance signal.

또한 칼러신호 기록계는 고역여파기(4)를 통해 3.58MHZ의 칼러신호를 검출하고, 저역 변환기(5)를 통해 AM변조하여 휘도신호보다 낮은 주파수로 저역 변환하는데, VHS방식의 VTR에서는 629KHZ로 변환한다. 그리고 상기 저역변환기(5)를 통한 629KHZ의 색 칼러신호는 증폭기(6)를 통해 증폭된다. 상기 칼러신호를 낮은 주파수로 변환하는 이유는 기록 대역을 절약할수 있는 동시에 생신호가 본래 위상 변조파이므로 자기 테이프와 비디오헤드계의 주행 불균일에 의한 시간변동에 대해서 그 영향을 받기 쉬운데, 낮은 주파수로 변환함으로서 같은 시간 변동을 받아도 위상변동을 적게할수 있어 색의 벗어남을 방지할 수 있기 때문이다.In addition, the color signal recorder detects a color signal of 3.58 MHZ through the high frequency filter (4), and modulates AM through the low frequency converter (5) to low-frequency conversion to a frequency lower than the luminance signal. . And the color color signal of 629KHZ through the low-frequency converter 5 is amplified by the amplifier 6. The reason why the color signal is converted to a low frequency is that the raw signal is a phase modulated wave because the raw signal is saved at the same time. This is because the phase shift can be reduced even by the same time variation, thereby preventing color deviation.

이때 상기 휘도보상부(3)의 출력인 저반송파 FM신호와 증폭기(6)의 출력인 저역 변환의 칼러신호를 Y/C믹서(7)에서 중첩되어 비디오헤드(8)에 공급되고, 이 비디오 헤드를 통해 자기 테이프 상에 기록된다.At this time, the low-carrier FM signal output from the luminance compensator 3 and the low-frequency conversion color signal output from the amplifier 6 are superimposed on the Y / C mixer 7 and supplied to the video head 8. It is written onto the magnetic tape through the head.

상기와 같은 VHS방식의 VTR에서 휘도신호를 싱크팁을 3.4MHZ로, 화이트 피크를 4.4MHZ로 하여 1MHZ의 주파수 편이로 FM변조하여 기록하는 경우, 이를 재생하면 해상도가 240본 정도가 된다. 그러나 현재 VTR은 고해상도를 추구하고 있는 관계로 S-VHS(Super S)방식의 VTR이 초래되었다.In the VHS VTR as described above, when the luminance signal is FM-modulated and recorded with a sync tip of 3.4MHZ and a white peak of 4.4MHZ at a frequency shift of 1MHZ, the resolution is about 240. However, since VTR is pursuing high resolution, VTR of S-VHS (Super S) method has been brought about.

상기 S-VHS방식에서는 휘도신호를 기록할시 싱크팁을 5.4MHZ로, 화이트 피크를 7MHZ로 하여 1.6MHZ의 주파수 편이를 갖으며 FM변조하므로, 재생시 400본의 해상도를 갖는 고화질의 화면을 구현할수 있다. 그러나 종래의 VHS방식으로는 광대역의 S-VHS방식을 만족시킬수 없었고, 이소인해 별도의 S-VHS방식의 회로를 구성해야 했으며, 별도의 S-VHS방식의 회로 구성시 본래의 VHS방식과 호환할 수 없는 문제점등이 있었다.In the S-VHS system, when the luminance signal is recorded, the sync tip is 5.4MHZ and the white peak is 7MHZ, and the FM modulation has a frequency shift of 1.6MHZ. can do. However, the conventional VHS method could not satisfy the wideband S-VHS method, and it was necessary to configure a separate S-VHS method circuit, and to be compatible with the original VHS method when configuring a separate S-VHS method circuit. There was problem that we could not.

따라서 본 고안의 목적은 VHS방식의 VTR에서 비디오 신호 기록시 FM변조 주파수를 광대역화하여 고해상도의 화질을 기록할수 있는 휘도신호 보상회로를 제공함에 있다.Accordingly, an object of the present invention is to provide a luminance signal compensation circuit capable of recording a high resolution image quality by widening the FM modulation frequency when recording a video signal in a VHS VTR.

본 고안의 또다른 목적은 저역 VHS방식과 고역의 S-VHS방식을 공통으로사용하고, 외부의 선택신호에 의해 해당 방식을 제어하여 휘도 기록 신호의 특성을 개선하는 동시에 호환성을 유지할수 있는 휘도신호 보상회로를 제공함에 있다.Another object of the present invention is to use a low-frequency VHS method and a high-frequency S-VHS method in common, and to control the corresponding method by an external selection signal to improve the characteristics of the luminance recording signal and maintain compatibility with the luminance signal. In providing a compensation circuit.

이하 본 고안을 도면을 참조하여 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the drawings.

제2도는 본 고안을 구현하기 위한 휘도신호 보상의 개요도로서, 제1도의 휘도보상부(3)에 대응하는 부분이다.FIG. 2 is a schematic diagram of luminance signal compensation for implementing the present invention, and corresponds to the luminance compensator 3 of FIG.

즉, FM변조부(2)의 저반송파의 FM변조신호를 입력하며 S-VHS감지신호의 상태에 따라 스위치(33)가 제어되므로서, S-VHS방식의 기록 모드시 스위치(33)가 "온"되어 S-VHS방식의 FM변조신호는 S-VHS휘도보상부(31)를 통해 출력되고, S-VHS방식의 기록보드가 아닐시에는 스위치(33)가 "온"되어 VHS방식의 M변조신호는 VHS휘도 보상부(32)를 통해 출력된다.That is, the input of the low carrier FM modulated signal of the FM modulator 2 is input and the switch 33 is controlled according to the state of the S-VHS detection signal, so that the switch 33 in the S-VHS type recording mode is turned off. When turned on, the FM modulated signal of the S-VHS method is output through the S-VHS luminance compensator 31, and when the recording board is not the S-VHS method, the switch 33 is turned on and the M of the VHS method is used. The modulated signal is output through the VHS luminance compensator 32.

제3도는 본 고안의 구체회로도로서, 캐패시터(C1-C5), 저항(R1-R5), 코일( L1-L2)및 트랜지스터(Q1)로 구성되어 FM변조파중에 포함된 칼러신호를 제거하는 동시에 S-VHS의 등화 특성을 보상하는 제1휘도보상수단과, 캐패서터(C6), 저항(R6 -R7)및 트랜지스터(Q2)로 구성되어 출력노드(N)에 접속되어 상기 S-VHS의 휘도 보상신호를 Y/C혼합부와 임피던스 매칭하는 제1버퍼수단과, 가변저항(VR1), 저항(R8 ) 및 코일(L3)로 구성되어 S-VHS방식보다 상대적을 낮은 VHS방식의 FM변조신호의 레벨을 조정하는 레벨조정수단과, 캐패스터(C7-C12), 코일(L4-L5), 저항(R6-R15 ) 및 트랜지스터(Q3)로 구성되어 FM변조신호에 포함된 칼러신호를 제거하는 동시에 VHS방식의 등화 특성을 보상하는 제2휘도보상수단과, 트랜지스터(Q4) 저항(R18)으로 구성되어 출력노드(N)에 접속되어 상기 VHS방식의 휘도보상신호를 Y/C혼합부와 임피던스 매칭하는 제2버퍼수단과, 트랜지스터(Q5) 및 저항(R16-R17)로 구성되어 상기 제2휘도보상수단의 출력단에 접속되어 S-VHS기록신호 발생시 스위칭되어 상기 VHS방식의 휘도보상신호를 패스시키는 스위칭 수단으로구성된다.3 is a specific circuit diagram of the present invention, which is composed of capacitors C1-C5, resistors R1-R5, coils L1-L2, and transistors Q1 to remove color signals contained in FM modulation waves. A first luminance compensation means for compensating equalization characteristics of the S-VHS, a capacitor C6, resistors R6-R7, and a transistor Q2, connected to an output node N, A first buffer means for impedance matching the luminance compensation signal with the Y / C mixing unit, and a variable resistor VR1, a resistor R8, and a coil L3, and the FM modulation of the VHS method, which is relatively lower than that of the S-VHS method. Level adjustment means for adjusting the level of the signal, and the capacitor (C7-C12), coils (L4-L5), resistors (R6-R15) and transistors (Q3) and the color signal included in the FM modulated signal A second luminance compensation means for removing and compensating equalization characteristics of the VHS system and a transistor Q4 resistor R18 connected to the output node N to compensate for the luminance of the VHS system. A second buffer means for impedance matching the arc to the Y / C mixing part, and transistors Q5 and resistors R16-R17, which are connected to the output terminal of the second luminance compensating means and switched when the S-VHS recording signal is generated. And switching means for passing the luminance compensation signal of the VHS method.

상술한 구성에 의거 본 발명을 제2,3도를 참조하여 상세히 설명한다.Based on the above-described configuration, the present invention will be described in detail with reference to FIGS.

먼저 본 고안의 개요를 살펴보면 제1도의 FM변조기(2)는 싱크 팁을 3.4MHZ로, 화이트 피크를 4.4MHZ로 하여 주파수 편이가 1MHZ 범위내에 있는 FM변조된 휘도신호를 발생하고, 싱크팁을 5.4MHZ로, 화이크 피크를 7MHZ로 하여 주파수 편이가 1.6MHZ범위내에 있는 S-VHS모드의 FM변조된 휘도신호를 발생한다.First, an overview of the present invention shows that the FM modulator 2 of FIG. 1 generates an FM-modulated luminance signal having a frequency shift of 1 MHZ with a sync tip of 3.4 MHZ and a white peak of 4.4 MHZ, and the sync tip of 5.4. With MHZ, a white peak of 7MHZ is used to generate an FM-modulated luminance signal in S-VHS mode with a frequency shift of 1.6 MHZ.

그러므로 S-VHS방식으로 기록하고자 하는경우에는 스위치(33)가 오프되어 S-VHS휘도 보상부(31)에서 고역의 휘도신호를 보상하여 출력하게 되며, VHS휘도 보상부(31)의 출력은 차단된다 또한 VHS방식으로 기록하고자 하는 경우에는 스위치(33)가 "온"되어 VHS휘도보상부(31)에서 S-VHS방식보다 상대적으로 저역인 휘도신호를 보상하여 출력하게 되며, 휘도신호가 저역인 상태이므로 S-VHS휘도보상부(31)는 동작하기 않게된다.Therefore, when recording in the S-VHS method, the switch 33 is turned off, and the S-VHS luminance compensator 31 compensates and outputs the high-frequency luminance signal, and the output of the VHS luminance compensator 31 is cut off. In addition, when recording in the VHS method, the switch 33 is turned on, and the VHS luminance compensator 31 compensates for and outputs a luminance signal that is relatively lower than that of the S-VHS method, and the luminance signal is low. Since the S-VHS luminance compensator 31 is not in operation.

따라서 상기 S-VHS휘도보상부(31) 또는 VHS휘도보상부(32)를 통해 보상된 휘도신호를 전술한 바와같이 저역변환된 296HZ의 칼러신호와 함께 Y/C혼합부(7)로 인가되어져 테이프에 기록된다.Therefore, the luminance signal compensated through the S-VHS luminance compensator 31 or the VHS luminance compensator 32 is applied to the Y / C mixing unit 7 together with the low-conversion 296HZ color signal as described above. Written on tape.

상기의 동작 과정을 구체적으로 설명한다.The above operation process will be described in detail.

기록모드(record made)시 단자(101)를 통해 12V의 전원이 공급되는데, 먼저 입력단자(100)를 통해 S-VHS방식의 FM변조파는 커플링 캐패시터(C1) 및 바이어스 조정용 저항(R1-R2)를 통해 트랜지스터(Q1)의 베이스단으로 인가된다. 이때 상기 트랜지스터(Q1)는 저항(R4) 및 캐패시터(C2)에 의해 제어되어 상기 FM변조신호를 컬렉터단으로 증폭출력하며, 저항(R4), 캐패시터(C4) 및 코일(L1)은 상기 증폭신호중에 포함된 296MHZ의 칼러성분을 트랩(trap)하여 휘도신호 대역내의 저역인 칼러대역을 비워주는 기능을 수행한다.In record mode, 12V power is supplied through the terminal 101. First, the S-VHS-type FM modulated wave is inputted through the input terminal 100 to the coupling capacitor C1 and the bias adjusting resistor R1-R2. Is applied to the base end of the transistor Q1. At this time, the transistor Q1 is controlled by the resistor R4 and the capacitor C2 to amplify and output the FM modulated signal to the collector stage, and the resistor R4, the capacitor C4, and the coil L1 are the amplified signal. It traps the color component of 296MHZ included in the inside to perform the function of emptying the low band color band in the luminance signal band.

또한 저항(R5), 캐패시터(C5) 및 코일(L2)는 S-VHS의 피킹(peaking)시정수 조정용으로서, S-VHS방식에서 기록하기 위한 휘도신호 대역의 등화특성을 보상하는 기능을 수행한다. 상기와 같이 S-VHS방식의 등화특성으로된 휘도신호는 다시 커플링 캐패시터(C6) 및 바이어스 조정용 저항(R6-R7)을 통해 버퍼기능을 수행하는 트랜지스터(Q2)의 베이스로인가되고, 이 신호에 의해 상기 트랜지스터(Q2)는 이미터단을 통해 출력단자(104)로 임피던스 매칭된 S-VHS방식의 휘도 보상신호를 출력한다.In addition, the resistor R5, the capacitor C5, and the coil L2 are used to adjust the peaking time constant of the S-VHS, and compensate for the equalization characteristics of the luminance signal band for recording in the S-VHS method. . As described above, the luminance signal having the equalization characteristic of the S-VHS method is applied to the base of the transistor Q2 which performs the buffer function through the coupling capacitor C6 and the bias adjustment resistor R6-R7. As a result, the transistor Q2 outputs an S-VHS type luminance compensation signal impedance-matched to the output terminal 104 through an emitter terminal.

이때 S-VHS모드시에는 도시하지 않는 시스템 제어부에서 단자(102)를 통해 "하이"신호를 인가하므로, 트랜지스터(Q5)가 턴온되어 VHS방식으로 보상되는 휘도신호를 바이패스시켜 S-VHS모드로 동작하도록 제어한다.At this time, in the S-VHS mode, the system control unit (not shown) applies the high voltage signal through the terminal 102, so that the transistor Q5 is turned on to bypass the luminance signal compensated by the VHS method to the S-VHS mode. To operate.

두번째로 VHS모드시, 시스템 제어부는 단자(102)를 통해 "로우"신호를 인가하므로, 트랜지스터(Q5)는 턴오프되어 VHS모드의 휘도보상신호를 발생할수 있도록 통로를 형성한다.Secondly, in the VHS mode, the system control unit applies the low signal through the terminal 102, so that the transistor Q5 is turned off to form a passage for generating the luminance compensation signal in the VHS mode.

상기 입력단자(100)를 통해 인가되는 VHS모드의 FM변조신호는 가변저항(V R1), 저항(R8) 및 코일(L3)을 통해 "하이"주파수를 억압하여 VHS모드의 레벨로 조정된다. 즉 VHS방식은 S-VHS방식보다 상대적으로 주파수를 사용하므로, VHS모드에 맞는 레벨의 FM변조신호로 변환된 휘도신호를 보상한다.The FM modulated signal of the VHS mode applied through the input terminal 100 is adjusted to the level of the VHS mode by suppressing the “high frequency” through the variable resistor V R1, the resistor R8 and the coil L3. That is, since the VHS method uses a frequency relatively to the S-VHS method, the VHS method compensates for the luminance signal converted into an FM modulated signal having a level suitable for the VHS mode.

상기 레벨 조정된 FM변조된 휘도신호는 커플링 캐패시터(C7)를 통해 캐패시터 (C12) 및 코일(L4)에서 휘도신호중에 포함된 629MHZ의 칼러신호가 트랩된다. 상기와 같이 휘도신호 대역내에 포함된 칼러신호를 제거한 휘도신호는 다시 커플링 캐패시터(C8) 및 바이어스 조정용 저항(R9-R10)을 통해 트랜지스터(Q4)로 인가된다.The color-adjusted FM-modulated luminance signal is trapped by the coupling capacitor C7, and the color signal of 629MHZ included in the luminance signal at the capacitor C12 and the coil L4 is trapped. The luminance signal from which the color signal included in the luminance signal band is removed is applied to the transistor Q4 through the coupling capacitor C8 and the bias adjustment resistors R9-R10.

상기 트랜지스터(Q4)는 상기 트랜지스터(Q1)가 S-VHS모드의 휘도신호에 대한 등화특성을 보상하는 기능과 같이 VHS모드의 휘도신호에 대한 등화특성을 보상하는데, 이미터단에 병렬로 접속된 코일(L5), 캐패시터(C7) 및 저항(R13)을 통해 VHS규격의 피킹 시정수를 조정하여 S-VHS방식보다 상대적으로 낮은 주파수인 VHS방식의 등화특성을 보상한다.The transistor Q4 compensates the equalization characteristic of the luminance signal of the VHS mode, such that the transistor Q1 compensates the equalization characteristic of the luminance signal of the S-VHS mode, and a coil connected in parallel to the emitter stage. (L5), the capacitor (C7) and the resistor (R13) to adjust the peaking time constant of the VHS standard to compensate for the equalization characteristics of the VHS method, which is a lower frequency than the S-VHS method.

상기 트랜지스터(Q4)를 통해 등화특성 및 증폭된 VHS규격의 휘도신호는 트랜지스터(Q4)의 베이스로 인가되며, 상기 트랜지스터(Q4)는 이 신호를 임피던스 매칭하며 출력단자(104)로 출력한다.The luminance signal of the VHS standard, which is equalized and amplified through the transistor Q4, is applied to the base of the transistor Q4, and the transistor Q4 outputs the signal to the output terminal 104 with impedance matching.

상술한 바와같이 VTR의 휘도신호 기록계에서 S-VHS모드 및 VHS모드의 휘도신호 보상부를 공통으로 두어 FM변조기에서 발생되는 FM변조된 S-VHS모드의 휘도신호와 VHS모드의 신호를 각각 보상토록 하고, 시스템제어부에서 발생되는 모드감지신호(S-VHS 또는 VHS모드)에 따라 해당 출력을 선택함으로서 VHS기능의 VTR세트 및 S-VHS기능의 VTR세트간에 호환성을 유지할수 있으며, VTR의 휘도신호 기록계에서 FM변조신호 기록시 휘도신호의 등화특성을 개선할 수 있어 열화방지 및 신호에 잡음비를 개선할 수 있는 이점이 있다.As described above, the luminance signal compensator of the S-VHS mode and the VHS mode is common to the luminance signal recorder of the VTR to compensate the luminance signal of the FM-modulated S-VHS mode and the VHS mode signal generated by the FM modulator, respectively. By selecting the corresponding output according to the mode detection signal (S-VHS or VHS mode) generated by the system control unit, it is possible to maintain compatibility between the VTR set of the VHS function and the VTR set of the S-VHS function. Since the equalization characteristic of the luminance signal can be improved when recording the FM modulated signal, there is an advantage of preventing degradation and improving the noise ratio of the signal.

Claims (1)

복합 비디오신호중 휘도신호 대역대를 검출한후 이를 FM변조하며, 상기 FM변조된 휘도신호에서 낮은 주파수를 강조하고 높은 주파수를 억압하여 테이프에 기록하는 VHS 및 S-VHS방식의 VTR의 휘도신호 기록회로에 있어서, 상기 FM변조부의 출력단에 접속되어 FM변조신호중에 포함된 칼러신호를 제거하는 동시에 S-VHS방식의 등화특성을 보상한후 Y/C혼합부로 인가하는 S-VHS휘도보상수단과, 상기 FM변조부의 출력단에 병렬 접속되어 S-VHS모드보다 상대적으로 낮은 VHS모드의 FM 변조된 휘도신호의 레벨을 조정하는 레벨 조정수단과, 상기 레벨 조정수단의 출력단에 접속되어 휘도신호중에 포함된 칼러신호를 제거하는 동시에 VHS방식의 등화특성을 보상한후 Y/C혼합부로 인가하는 VHS휘도보상수단과, 상기 VHS휘도보상수단의 출력단에 병렬 접속되어 S-VHS기록모드신호의 상태에 따라 스위칭되어 상기 S-VHS또는 VHS휘도보상수단의 출력을 택 출력하는 스위칭 수단으로 구성됨을 특징으로 하는 S-VHS/ VHS휘도신호 기록계의 보상회로.VHS and S-VHS type VTR luminance signal recording circuit for detecting and recording FM signal band of composite video signal, and emphasizing the low frequency and suppressing high frequency in the FM modulated luminance signal. S-VHS luminance compensating means connected to an output terminal of the FM modulator to remove the color signal included in the FM modulated signal and to compensate the equalization characteristic of the S-VHS method and apply it to the Y / C mixing unit. Level adjusting means connected in parallel to the output of the FM modulator to adjust the level of the FM modulated luminance signal in the VHS mode, which is relatively lower than the S-VHS mode, and a color signal contained in the luminance signal connected to the output of the level adjusting means. The VHS luminance compensator is applied in parallel to the output terminal of the VHS luminance compensator and the VHS luminance compensator Are switched according to the state of the S-VHS / VHS luminance signal recording system of the compensation circuit, characterized by a switching means configured to select an output of the output S-VHS or VHS luminance compensation means.
KR2019890004235U 1989-04-04 1989-04-04 Luminance signal compensation circuit of vtr KR920000812Y1 (en)

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