KR910008346Y1 - Picture quality improving device of video cassette recorder - Google Patents

Picture quality improving device of video cassette recorder Download PDF

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Publication number
KR910008346Y1
KR910008346Y1 KR2019880015087U KR880015087U KR910008346Y1 KR 910008346 Y1 KR910008346 Y1 KR 910008346Y1 KR 2019880015087 U KR2019880015087 U KR 2019880015087U KR 880015087 U KR880015087 U KR 880015087U KR 910008346 Y1 KR910008346 Y1 KR 910008346Y1
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South Korea
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signal
recording
automatic gain
output
output signal
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KR2019880015087U
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Korean (ko)
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KR900007337U (en
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홍봉근
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삼성전자 주식회사
안시환
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/022—Electronic editing of analogue information signals, e.g. audio or video signals
    • G11B27/024—Electronic editing of analogue information signals, e.g. audio or video signals on tapes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/90—Tape-like record carriers

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

Abstract

내용 없음.No content.

Description

VTR의 화질 개선장치VTR quality improvement device

제1도는 종래의 재생계 블럭도.1 is a conventional regeneration system block diagram.

제2도는 종래의 녹화계와 재생계 조합블럭도.2 is a combination block of a conventional recording system and a reproduction system.

제3도는 본 고안의 재생계 블럭도.3 is a regeneration system block diagram of the present invention.

제4도는 본 고안의 녹화계와 재생계 조합블럭도.4 is a combination block of the recording system and the reproduction system of the present invention.

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

100 : 헤드신호 입력단 101 : 헤드신호 증폭기100: head signal input stage 101: head signal amplifier

102 : 등화증폭기 103 : 복조기102: equalization amplifier 103: demodulator

104 : 저역여파기 105 : 디-엠파시스104: low pass filter 105: d-emphasis

106 : 노이즈제거기 107 : 혼합기106: noise canceller 107: mixer

108 : 버퍼 110 : 컬러처리계108: buffer 110: color processing system

120 : 비디오출력단자 200 : 비디오입력단120: video output terminal 200: video input terminal

201, 304 : 자동이득조절기 202, 203 : 동기검출기201, 304: Automatic gain controller 202, 203: Synchronous detector

203, 302 : 피크신호검출기 204, 301 : 동기분리기203, 302: peak signal detector 204, 301: synchronous separator

215 : 컬러처리회로 220 : 녹화신호증폭출력단자215: color processing circuit 220: recording signal amplification output terminal

300 : 자동이득조절회로 SW1∼SW4: 녹화신호증폭출력단자300: automatic gain control circuit SW 1 to SW 4 : recording signal amplification output terminal

VR1, VR2: 자동이득조절회로VR 1 , VR 2 : Automatic Gain Control Circuit

(동일부 동일회로블럭을 의미함)(Same part of same circuit block)

본 고안은 VTR의 화질개선장치에 관한 것으로 특히 재생시 자동이득조절기를 이용하여 출력레벨을 일정하게 유지시켜 양질의 화면을 얻기위한 VTR의 화질개선장치에 관한 것이다.The present invention relates to an image quality improvement apparatus for a VTR, and more particularly, to an image quality improvement apparatus for a VTR for obtaining a high quality screen by maintaining a constant output level using an automatic gain controller during playback.

종래의 VTR은 제1도에 도시한 재생계와 같이 재생시 비디오헤드(100)에서 검출된 신호를 증폭하고 가변 저항(VR1)을 사용하여 재생레벨을 조정하였으며 이 조정된 재생신호는 휘도(Y) 신호와 컬러(C) 신호를 혼합하는 혼합기(107)를 거쳐 그대로 비디오로 출력이 되었다.The conventional VTR amplifies the signal detected by the video head 100 during reproduction like the reproduction system shown in FIG. 1 and adjusts the reproduction level using the variable resistor VR 1 . The video was output as it is through the mixer 107 mixing the Y) signal and the color (C) signal.

제2도는 종래의 녹화(REC)계와 상기 재생계를 블럭도로서 녹화시 비디오 입력단자(200)을 통해 입력된 비디오신호는 자동이득조절기(201)를 거쳐 처리된 신호와 컬러신호 처리회로(215)를 거쳐 처리된 신호가 혼합기(209)에서 혼합되어 녹화증폭기(220)로 출력되어 녹화되었다.2 is a block diagram of a conventional recording (REC) system and the reproduction system as a block diagram, a video signal input through the video input terminal 200 is processed through an automatic gain controller 201 and a color signal processing circuit ( The signal processed through 215 is mixed in the mixer 209 and output to the recording amplifier 220 for recording.

그러나 상기 종래의 재생계에서는 자동이득조절기를 사용하지 않았으므로 재생테이프의 재생상태에 따라서 비디오신호의 출력레벨이 변동하여 재생 화면의 질이 저하되는 문제점이 있었다.However, in the conventional reproducing system, since the automatic gain controller is not used, there is a problem in that the output level of the video signal varies according to the reproducing state of the reproducing tape, thereby degrading the quality of the reproducing screen.

본 고안은 상기와 같은 문제점을 해결하기 위하여 안출한 것인바, VTR의 녹화시에 사용하는 자동이득조절기를 스위치를 이용하여 재생시에도 사용할 수 있도록 설계를 함으로써 재생시 테이프에 따라 발생할 수 있는 출력레벨변동을 방지하고 재생레벨조정포인트를 삭제하여 재생화면의 질을 향상시키기 위한 것으로 이하 첨부된 도면에 의하여 본 고안은 상세히 설명하면 다음과 같다.The present invention was devised to solve the above problems. The automatic gain controller used for recording the VTR is designed to be used even during playback by using a switch, so that the output level variation that may occur depending on the tape during playback is designed. The present invention will be described in detail with reference to the accompanying drawings as follows.

제3도는 본 고안의 회로블럭도로서 비디오헤드(100)에서 검출된 주파수변조신호를 헤드신호증폭기(101)에서 증폭하고 이 증폭된 신호를 주파수변조 등화(EQ) 증폭기(102)에서 적당한 주파수특성과 레벨이 같도록 등화증폭을 시킨 후 주파수복조기(103)에서 복조한다.3 is a circuit block diagram of the present invention, which amplifies a frequency modulated signal detected by the video head 100 in the head signal amplifier 101 and converts the amplified signal into a frequency modulated equalization (EQ) amplifier 102. The equalization amplification is performed such that the level is equal to and the level is demodulated by the frequency demodulator 103.

이때 상기 복조된 신호와 주파수변조의 2체배신호가 출력되며 이 출력신호는 저역여파기(104)를 통하여 상기 주파수복조의 2체배신호를 제거하고 디엠퍼시스(Deemphasis)는 녹화시에 엠퍼시스(Emphasis)된 신호를 원래의 주파수특성으로 바꾼후 화면의 노이즈를 제거하는 노이즈제저기(106)를 거쳐 녹화시에 사용된 자동이득조절기(304)에 인가된다.At this time, the demodulated signal and the doubled signal of the frequency modulation are output, and this output signal is removed by the low pass filter 104 to remove the doubled signal of the frequency demodulation and the deemphasis is emphasis at the time of recording. The signal is applied to the automatic gain adjuster 304 used at the time of recording via the noise canceller 106 which removes the noise of the screen after changing the signal to the original frequency characteristic.

상기 자동이득조절기(304)는 동기분리기(301)와 테크의 자동이득조절감지기(302) 및 동기자동이득조절기(303)의 출력신호를 받는 상기 자동이득조절기(304)의 제어를 받아 혼합기(107)에 주파수복조신호를 인가하면 상기 혼합기(107)는 상기 자동이득조절기(304)의 입력신호와 컬러신호처리계(110)에 의한 입력신호를 혼합하여 버퍼(108)에서 증폭 후 비디오 출력단(120)을 통해 출력된다.The automatic gain controller 304 is a mixer 107 under the control of the automatic gain controller 304 which receives the output signal of the synchronous separator 301 and the automatic gain control sensor 302 and the synchronous automatic gain controller 303 of the tech. When the frequency demodulation signal is applied to the mixer 107, the mixer 107 mixes the input signal of the automatic gain controller 304 and the input signal of the color signal processing system 110 and amplifies the buffer at the video output stage 120. Is printed via).

제4도는 본 고안의 녹화계와 재생계를 조합한 회로블럭도로서, 우선 녹화시의 동작을 설명하면 스위치(SW1∼SW4)의 접점이 R에 접촉되어 비디오 입력단(200)에 입력된 비디오신호가 컬러신호처리회로(215)에 가해져 저역변환된후 혼합기(209)에 가해지고, 한편 상기 스위치(SW3)를 통하여 입력된 비디오 신호는 자동이득조절기(201)에 입력되어 이득이 조절된후 상기 스위치(SW1)를 통해 저역여파기(104)에 가해져 이 저역여파기(104)에서 휘도신호(Y)만 분리되어 통상의 휘도신호 처리계(205∼208)를 거쳐 상기 혼합기(209)에 가해져 고주파변조 휘도신호와 저역 변환컬러신호가 혼합되어 녹화증폭단(220)으로 출력되어 녹화된다.4 is a circuit block diagram of a combination of a recording system and a reproducing system of the present invention. First, when an operation during recording is described, the contacts of the switches SW 1 to SW 4 are brought into contact with R to be input to the video input terminal 200. The video signal is applied to the color signal processing circuit 215 and then low-converted to the mixer 209, while the video signal input through the switch SW 3 is input to the automatic gain controller 201 to adjust the gain. And then applied to the low pass filter 104 through the switch SW 1 to separate only the luminance signal Y from the low pass filter 104 and through the normal luminance signal processing systems 205 to 208. In addition, the high frequency modulation luminance signal and the low frequency conversion color signal are mixed and output to the recording amplifier stage 220 for recording.

이때 상기 저역여파기(104)를 통과한 휘도신호는 상기 스위치(SW4)를 통해 동기 및 피크 검출기(202), (203) 및 동기분리기(204)에 가해져 그 출력이 자동이득조절기(201)를 제어하므로 항상 일정한 레벨을 유지하게 된다.In this case, the luminance signal passing through the low pass filter 104 is applied to the synchronous and peak detectors 202, 203 and the synchronous separator 204 through the switch SW 4 , and the output thereof is applied to the automatic gain controller 201. As a result of control, it is always at a constant level.

한편, 재생기는 스위치(SW1∼SW4)의 접점이 P에 접촉되고 헤드신호 입력단(100)으로 입력된 재생비디오 신호가 헤드신호 증폭기(101)에서 증폭된 후 컬러처리계(110) 및 등화증폭기(102)에 가해진다.On the other hand, the player reproduces the reproduced video signal inputted through the head signal input terminal 100 at the contact point of the switches SW 1 to SW 4 to the head signal input terminal 100 and then the color processing system 110 and the equalization. Applied to amplifier 102.

또한 고주파 복조기(103)에서 복조된 휘도신호는 상기 스위치(SW1)를 통해 저역여파기(104)에서 컬러 성분이 제거된 후 디엠파시스(105)에서 원래의 신호 레벨로 조정된 후 노이즈제거기(106)에 의해 고주파 부분의 노이즈를 제거하여 자동이득조절기(201)에 스위치(SW3)를 통해 가해져 이득이 조정된 후 혼합기(210)에서 컬러신호와 혼합된 후 스위치(SW2)를 통해 영상신호출력단(120)으로 출력된다.In addition, the luminance signal demodulated by the high frequency demodulator 103 is adjusted to the original signal level by the deemphasis 105 after the color component is removed from the low pass filter 104 through the switch SW 1 and then a noise canceller ( 106 is applied to the automatic gain controller 201 through the switch (SW 3 ) to remove the noise of the high frequency portion by adjusting the gain and then mixed with the color signal in the mixer 210, the image through the switch (SW 2 ) It is output to the signal output terminal 120.

이때, 상기 디엠파시스(105)의 출력이 스위치(SW4)를 통해 동기 및 피크검출기(202), (203)에 가해지게 되어 녹화시와 동일한 동작으로 자동이득조절기(201)의 이득을 조절하게 되므로 재생휘도신호의 레벨을 항상 일정하도록 제어할 수 있는 것이다.At this time, the output of the DMPASS 105 is applied to the synchronization and peak detectors 202 and 203 through the switch SW 4 to adjust the gain of the automatic gain controller 201 in the same operation as in recording. Therefore, the level of the reproduction luminance signal can be controlled to be constant at all times.

이상에서 설명한 바와 같이 본 고안은 재생시에도 자동이득조절기가 있으므로 해서 녹화된 테이프가 녹화상태에 따라 차이가 있음으로 해서 재생시 비디오레벨의 차이를 제거하고, 상기 출력 레벨을 가변저항으로 조정하여 정확한 출력레벨을 조정하지 못하던 것을 상기 자동이득조절기에 의해 항상 일정하고 정확한 출력레벨을 얻을 수 있어서 깨끗한 화면을 디시플레이 할 수 있는 효과가 있는 것이다.As described above, the present invention has an automatic gain adjuster during playback, so that the recorded tape has a difference depending on the recording state, thereby eliminating the difference in video level during playback, and by adjusting the output level with a variable resistor for accurate output. The automatic gain controller can not always adjust the level can always obtain a constant and accurate output level can have the effect of displaying a clean screen.

Claims (1)

자기테이프에 영상신호를 녹화, 재생하는 장치에 있어서, 녹화시는 영상신호를 선택하고, 재생시는 헤드로부터 재생되어 복조된 휘도신호를 선택하기 위한 제1의 선택스위치(SW3)와, 이 스위치(SW3)의 선택신호가 항상 일정한 레벨이 되도록 동기 및 피크 검출기에 의해 제어되는 자동이득조절기와, 녹화시는 상기 자동이득조절기 출력을 선택하고 재생시에는 헤드로부터 재생되어 복조된 휘도신호를 선택하기 위한 제2의 선택스위치(SW1)와, 이 스위치(SW1)에 의해 선택된 신호에서 휘도신호 성분을 추출하는 저역여파기와, 녹화시는 상기 저역여파기의 출력신호를 선택하고 재생시는 디엠파시스를 통과한 신호를 선택하여 동기 및 피크검출기에 가해주는 제3의 선택스위치(SW4)와, 녹화시는 상기 자동이득조절기의 출력신호를 선택하고 재생시는 상기 자동이득조절기의 출력신호와 컬러신호처리계의 출력신호를 혼합하는 혼합기의 출력신호를 선택하는 제4의 선택스위치(SW2)와를 구성한 것을 특징으로 하는 VTR의 화질개선장치.A device for recording and reproducing video signals on magnetic tape, comprising: a first selection switch (SW 3 ) for selecting a video signal during recording and a luminance signal reproduced and demodulated from a head during playback; An automatic gain controller controlled by a synchronous and peak detector so that the selection signal of (SW 3 ) is always at a constant level, the output of the automatic gain controller is selected during recording, and the luminance signal reproduced and demodulated from the head during playback A second selector switch SW 1 for selecting a low pass filter for extracting a luminance signal component from the signal selected by the switch SW 1 , and an output signal of the low pass filter for recording and deemphasis during reproduction. selection switch to select one of the third signal passage and applied to the synchronization and the peak detector (SW 4) and, when the recording is selected the output signal of the automatic gain regulator and reproduction is the The selection switch 4 (SW 2) image quality improvement apparatus of the VTR according to claim wareul configured to select the output signal of the mixer for mixing the output signal and the output signal of the color signal processing system of the automatic gain control.
KR2019880015087U 1988-09-12 1988-09-12 Picture quality improving device of video cassette recorder KR910008346Y1 (en)

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KR910008346Y1 true KR910008346Y1 (en) 1991-10-15

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