baber/WOPTO huggingface dataset:
Patent KR-19990085441-A (KR)
Title: 황화수소의 선택적 산화용 촉매 및 이를 이용한 티오황산암모늄합성방법
Filed: 1998-05-18
Abstract: 본 발명은 황화수소의 선택적 산화용 촉매 및 이를 이용한 티오황산암모늄의 합성방법에 관한 것이다. 암모니아와 물의 존재하에서 황화수소 함유 반응가스를 산화 바나듐이 다공성 담체에 담지되어 있는 촉매상에서 산소와 반응시켜 티오황산암모늄을 합성하는 것을 특징으로 하는 본 발명의 방법은 암모니아와 물이 존재하는 조건에서도 높은 촉매 활성을 유지하므로 천연가스나 원유의 정제 공정이나 금속 제련 공정에서 다량으로 발생되는 황화수소 함유 폐가스로부터 부가가치가 높은 티오황산암모늄을 직접적으로 용이하게 합성할 수 있으며 이와 함께 무독성의 원소 황이 회수됨으로써, 황화수소로 인한 환경오염 문제의 해결이 가능하다.
Patent KR-19990086111-A (KR)
Title: 레토르트 처리기술을 응용한 그라탱 요리의 제조방법
IPC: A23L1/00
Filed: 1998-05-25
Abstract: 본 발명은 레토르트 처리기술을 응용한 그라탱 요리의 제조방법에 관한 것으로서, 더욱 상세하게는 서양의 정통요리인 그라탱 요리를 제조함에 있어서, 화이트 소스위에 연성 가공치즈를 덮는 조리방법과 다양한 고형물을 함유시키는 특수한 조미배합 기술 및 함기식 2단 가열 살균방식으로 레토르트 살균하는 방법을 사용하므로써, 전자렌지로 조리하여 취식할 경우에 그 성상과 식감이 뛰어나며 전체적으로 부드러우면서도 깊고 풍부한 맛을 얻을 수 있고, 씹는 포만감을 극대화시킬 수 있음은 물론, 즉석 식품화하여 소비자들이 언제든지 쉽고 저렴하게 식생활을 즐길수 있도록 대중화한 레토르트 처리기술을 응용한 그라탱 요리의 제조방법에 관한 것이다.
Patent KR-20000002386-A (KR)
Title: Sound diversify device of car horn and method thereof
Inventor: JO MYUNG CHUL
IPC: B60Q5/00
Filed: 1998-06-19
Abstract: PURPOSE: A car horn sound diversify device and a method thereof are provided to record the melody of the sound desired by a user and to replay the recorded sound to make a horn by a selection of the horn button. CONSTITUTION: A car horn sound diversity device comprises:a horn switch producing a horn control signal to produce a horn; a record switch producing a record/read mode control signal according to a selecting action; a sound selection unit(14) producing a sound selection signal to select a sound; and an oscillator producing a clock pulse having a regular period by a responding to input of the horn control signal and a record control signal.
Patent KR-20000003039-A (KR)
Title: Production method for retort food
Inventor: KOAMI HIROSHI
IPC: A23L7/10
Filed: 1998-06-25
Abstract: PURPOSE: A production method for a retort food is provided to easy to make, to easy to eat, and to taste good. CONSTITUTION: The production method for the retort food comprises: sources of food done a cooking process put into a filling film; put into an exterior film by cooling after steaming; a retort sterilization treatment done after cooking or at the same time with cooking.
Patent KR-20000003197-A (KR)
Title: Method for maintaining a status before interruption of electric power of a video cassette recorder
Inventor: YIM TAE YUN
IPC: G11B20/02
Filed: 1998-06-26
Abstract: PURPOSE: A method is provided to continue to operate a video cassette recorder by maintaining an operation state before interruption of electric power. CONSTITUTION: The method for maintaining a status before interruption of power of a video cassette recorder which includes a micom(11) for controlling the operation of the video cassette recorder and a memory(15) for maintaining stored data even after power-off, the method comprises the steps of: periodically storing an operation status of the video cassette recorder to the memory(15) when a power is supplied normally; and after interruption of electric power, operating the video cassette recorder by use of the stored operation status in the memory(15) before the interruption of power when the power is supplied again.
Patent KR-20000003939-A (KR)
Title: Method for manufacturing semiconductor devices
Inventor: LEE JEONG HO
IPC: H01L21/316
Filed: 1998-06-30
Abstract: PURPOSE: A fabrication method of semiconductor devices is provided to remove defects in a semiconductor substrate and decrease manufacturing cost. CONSTITUTION: The method comprises the steps of: homogenizing oxygen ions in a semiconductor substrate(21) by annealing bare substrate and generating an oxygen deposit(25); selective etching the semiconductor substrate(21) to form a trench(29) for divide isolation; and coupling metal ions in the semiconductor substrate to the oxygen deposit(25) by forming a sacrificial oxide in the etched semiconductor substrate, removing the sacrificial oxide and forming an oxide layer(30).
Patent KR-19990013546-A (KR)
Title: 플라즈마 표시장치
IPC: H01J11/36
Filed: 1998-07-02
Abstract: 기판과, 이 기판의 상면에 소정의 패턴으로 형성된 제1전극과, 이 제1전극이 매립되도록 기판의 상면에 형성된 유전체층과, 상기 유전체층의 상부에  제1전극과 직교하는 하는 방향으로 형성된 제2전극들과, 상기 제2전극들의 사이에 제1전극과 형성된 보조전극을 포함하여 된 플라즈마 장치를 개시한다. 이 플라즈마 장치는 방전개시전압을 낮추고 발광휘도를 높일 수 있다.
Patent KR-20000007438-A (KR)
Title: Photo distribution block monolithic optical depth line selecting apparatus
Inventor: SHIM SEONG HEON
IPC: G02B6/46
Filed: 1998-07-03
Abstract: PURPOSE: A photo distribution block monolithic optical depth line selecting apparatus is provided to prevent a curvature loss of the optic fiber and to simplify a system by integrating a photo distribution block. CONSTITUTION: The photo distribution block connected between each optic depth lines composing an optic line, includes a test photo input/output port(412), a communication photo input/output port(414) connecting with a sending exchanger of corresponding optical depth line, a multi-photo input/output port(413) connecting with a receiving exchanger, a filter built-in optical device(411) filtering and multiplexing an optical signal from the test photo input/output port and the communication photo input/output port to output to the multi-photo input/output port, or dividing an optical signal into two optical signal in two wavelength to output one to the test photo input/output port and to output the other to the communication photo input/output port.
Patent KR-19990013802-A (KR)
Title: 가이드 레일 스플라이스
IPC: B65G21/20
Filed: 1998-07-13
Abstract: 컨베이어 가이드 레일의 연접 단부를 결합시키기 위한 유형의 스플라이스는 금속 채널 부재와 이 채널 부재 안쪽에 배치된 플라스틱 삽입물을 구비하며, 금속 채널 부재는 중심 섹션과 이 중심 섹션으로부터 제1 예각으로 안쪽으로 연장되는 한쌍의 측면 섹션을 구비한다.  스플라이스는 기부 및 이 기부로부터 제2 예각으로 안쪽으로 경사져서 내·외면을 형성하는 측면 섹션을 구비한 제1 부재와, 기부 및 이 기부로부터 제3의 선정된 예각으로 안쪽으로 경사져서 내·외면을 형성하는 측면 섹션을 구비한 제2 부재를 구비한다.  한쌍의 나사식 스터드가 부재들 중 하나의 기부의 외면으로부터 연장되며, 나사식 스터드를 수용하기 위한 다른 부재의 기부를 통해 구멍이 형성된다.  나사식 파스너가 제1 및 제2 부재를 가이드 레일 섹션의 연접 단부상에 조이기 위한 나사식 스터드상에 수용될 수 있다.  제2 및 제3 예각 중 하나 이상이 제1 예각보다 작음으로써 제1 및 제2 부재의 측면 섹션은 파스너가 조여지는 때 채널 부재를 견고하게 파지하게 된다.
Patent KR-20000009598-A (KR)
Title: Automatic backup method of database in private switch system
Inventor: LEE YONG SUNG
IPC: G06F11/14
Filed: 1998-07-27
Abstract: PURPOSE: A method which corrects a database area of a memory in a private switch system by force and backs up the corrected database in a hard disc, is provided. CONSTITUTION: The automatic backup method of a database in a private switch system, the method comprising the steps: judging whether a database area is corrected when a forced memory correcting message from maintenance/conservation device is generated; setting a change flag of the corrected database when the database area is corrected; periodically generating a back up timer message and judging whether a change flag of the database is set; backing up the database in a hard disc when the change flag of the database is set; and finishing the backup operation and resetting the change flag of the database.
Patent KR-20000013599-A (KR)
Title: Collecting and discharging system of leachate from landfill
Inventor: LEE GEUN WOOK
IPC: C02F9/00
Filed: 1998-08-11
Abstract: PURPOSE: A collecting and discharging system of leachate from landfill prevents uneven settlement and penetration of leachate into the ground, thereby reducing contamination of soil and ground water. CONSTITUTION: A collecting and discharging system of leachate from landfill comprises:A bottom water collecting pipe lines(13) arranged upon a water blocking sheet(12) formed upon the bottom of landfill; an annular tube(15) provided on the interior side of landfill to be in direct connected with the bottom water collecting pipe lines; a plurality of vertical water collecting pipes(15) directly connected with the bottom water collecting pipe lines and the annular pipe; and at least one intermediate water collecting pipe(18) directly connected with the annular pipe through a slanted pipe(19).
Patent KR-20000018687-A (KR)
Title: Method for managing wastewater using continuous filtration process
Inventor: KIM CHANG WON
IPC: C02F3/30
Filed: 1998-09-01
Abstract: PURPOSE: A method for managing waste water using continuous filtration process can remove organic material, suspended solids, and nitrogen. CONSTITUTION: The method is composed of removal process for organic material, nitrification process, absorption process for suspended solids, and effluent process. Wastewater flows into reactor(A) where biological membrane is fixed. Organic materials which are remained after nitrification process are removed by aeration tank, and ammonium nitrate is changed to nitrate. Suspended solids which are remained after fixed biological reactor and solids which are remained after filtration tank flow out through solid effluent pipe. Some of the outflow is returned for removing of nitrate. The compact tertiary treatment process can save ground and money because the process does not need secondary settling tank and extra filtration tank.
Patent KR-20000019761-A (KR)
Title: Device for automatically transmitting identification of communication terminal
Inventor: KIM JONG SEOB
IPC: H04B7/26
Filed: 1998-09-15
Abstract: PURPOSE: A device for automatically transmitting an identification of a communication terminal automatically transmits ID of a communication terminal to a receiving part pager after receiving a call confirmation signal from the receiving part pager. CONSTITUTION: A device for automatically transmitting an ID of a communication terminal includes an ID storage part(140), a signal detector(120), an ID transmitter(130), and a controller(110). The ID storage part(140) stores ID of a communication terminal therein. The signal detector detects a calling confirmation signal transmitted from the pager, if the pager is called by a telephone function. The ID transmitter transmits the ID of the communication terminal to the pager, if the signal detector detects the call confirmation signal. The controller transmits the ID of the communication terminal to the ID transmitter if the calling confirmation signal is detected by the signal detector. Thereby. a user's convenience is enhanced.
Patent KR-20000020191-A (KR)
Title: Semiconductor ic having power line and ground line for reducing emi
Inventor: HAM SEOK HEON
IPC: H01L23/58
Filed: 1998-09-18
Abstract: PURPOSE: A semiconductor IC having power line and ground line for reducing EMI(electromagnetic intergerence) is provided to prevent interference against charge accumulation and the interference of current flow. CONSTITUTION: A semiconductor IC having power line and ground line for reducing EMI comprises chip surface(21) containing ICs, power lines(25) supplying source voltage to the IC, and ground lines(23) for grounding the ICs. The power lines and ground lines are formed along the edge of the chip surface. In the corner of the chip surface, the power lines and ground lines are formed in spherical shape. The ground lines are formed between the edge of the chip surface and the power lines, and the power lines are formed between the edge and the ground lines.
Patent KR-20000020546-A (KR)
Title: Optical system for transmitting and receiving in lidar system
Inventor: CHA HYUNG GI
IPC: G02B27/00
Filed: 1998-09-22
Abstract: PURPOSE: An optical system for transmitting and receiving in LIDAR system is provided to improve a size of system and a dynamic range by unifying a transmitting optical system and a receiving optical system as one body. CONSTITUTION: An optical system for transmitting and receiving in LIDAR system relates to a transmitting and receiving optical system. The LIDAR system comprises conventionally a transmitting optical system and a receiving optical system. The optical device is formed to unify the transmitting optical system and the receiving optical system as one optical system. In order to realize the object, the optical system comprises an aluminum mirror(13). The aluminum mirror is formed with a small hole(14) to penetrate a laser beam. Accordingly, a transmitted and received beam is divided by the mirror.
Patent KR-19990030103-A (KR)
Title: 이소시아네이트 기재의 연속 기포형 경질 발포체
IPC: C08G101/00
Filed: 1998-09-24
Abstract: 본 발명은 
     a) 폴리이소시아네이트와 
     b) 이소시아네이트에 반응성인 수소 원자를 함유하는 화합물을 
     c) 물, 
     d) 필요한 경우, 물리적 발포제로 작용하는 유기 화합물, 
     e) 촉매, 보조제 및(또는) 첨가제의 존재하에 
     반응시켜 연속 기포형 경질 발포체를 제조하는 방법에 관한 것으로, 여기서 사용되는 반응성 수소 원자를 함유하는 화합물은 하기 구조를 갖는 물질이다. 
     
       
         
       
     
     상기 식에서, 
     m은 0 내지 15이고, n은 0 내지 1이며, o는 0 내지 15이고, p는 0 내지 1이며, q는 0 내지 15이고, r은 0 내지 1이며, s는 0 내지 15이고, t는 0 내지 1이며, u는 0 내지 10이며, v는 0 내지 15이고, x는 1 내지 5이며, y는 1 내지 4이거나 r + n ≠ 0인 경우 1 내지 3의 혼합이고, z는 0 내지 3이며, z i 는 0.1 내지 3이고, 
     R 1 은 다가 알콜의 구조를 기재로 하는 OH기가 없는 지방족 구조, 바람직하게는 에틸렌 글리콜, 디에틸렌 글리콜, 트리에틸렌 글리콜, 1,2-프로필렌 글리콜 및 디프로필렌 글리콜, 1,4-부탄디올, 1,6-헥산디올, 네오펜틸 글리콜, 1,3-부탄디올, 트리메틸올프로판, 트리메틸올에탄, 글리세롤, 펜타에리트리톨이며, 이들 물질은 또한 에스테르화에서 서로간의 임의 혼합물로 사용될 수 있으므로, R 1 은 또한 상응하는 구조의 혼합물일 수 있고, 
     R 2 는 COOH기가 없는 폴리카르복실산 라디칼, 예를 들어 아디프산, 테레프탈산, o-프탈산이며, 
     R 3 은 R 1 과 같은 알콜 라디칼이다.
Patent KR-20000021137-A (KR)
Title: Bottle cork having measuring container
Inventor: KIM JUN GYU
IPC: B65D41/26
Filed: 1998-09-24
Abstract: PURPOSE: A bottle cork having a measuring container is provided to be used by metering the necessary amount since the content inside a bottle is flowed in the measuring container if the bottle is inclined after closing the inlet of the bottle to inject the measuring container into a flavoring bottle. CONSTITUTION: A measuring scale is indicated on the surface of a measuring container since the measuring container having a slant face on a lower part of a discharge hole of a bottle cork main body(3) So that inflow hole(302) formed on the lower face of the bottle cork main body is communicated into the container(4). Herein, a partition(402) is formed on the outside of the measuring container. If the inlet is slanted downward to put the content inside the bottle in the measuring container through the inflow hole, the content flows into the measuring container through the inflow hole while the inflow hole is soaked in the liquid phase content put inside the bottle.
Patent KR-20000025936-A (KR)
Title: Soft hand-off method of digital mobile communication system
Inventor: CHO EUN SEON
IPC: H04B7/26
Filed: 1998-10-15
Abstract: PURPOSE: A soft hand-off method of digital mobile communication system is provided to increase quality of a mobile terminal, to reduce the rate of channel use, and to prevent blockage of a call. CONSTITUTION: A soft hand-off method of digital mobile communication system includes first through seventh steps. The first step is to obtain an information of channel use state when a management base station receives an information of communication quality of a mobile terminal and a hand-off request message. The second step is to count a critical value of hand-off parameter according to the information of channel use state. The third step is to compare a previous critical value of hand-off parameter and a new critical value of hand-off parameter, and to determine an implement of the hand-off. The fourth step is to request the hand-off to a target base station when the hand-off is implemented in the third step. The fifth step is to obtain a message of the hand-off permission including a traffic channel information from the target base station. The sixth step is to transmit the message of the hand-off permission including the new critical value of hand-off parameter and the traffic channel information. The seventh step is the mobile terminal to start communication using the traffic channel of the target base station, assigned newly.
Patent KR-19990007640-A (KR)
Title: 램프 콘트롤러
Filed: 1998-10-15
Abstract: 본 발명은 램프 콘트롤러에 관한 것으로, 종래에는 각 트라이액들의 주 단자는 다수의 병렬로 접속된 발광 다이오드에 변압기의 2차 권선을 통한 AC전원이 공급되도록 하기 위하여 접속할 때 직접 케이블을 각각 연결하거나 별도의 접속 단자를 각 케이블에 개별적으로 연결하여 각 단자에 일일이 접속하였다. 이때문에 케이블의 연결을 위한 작업이 매우 번거롭고 복잡하여 제품의 생산성이 떨어지고, 제품의 불량률이 높아지며, 또 고장이 발생되거나 발광다이오드의 수명이 다하면 램프 콘트롤러의 수명이 많이 남아 있음에도 불구하고 부품의 부분교체 및 보수가 어렵거나 불가능하여 장식용 램프세트를 모두 교환해야하는 등 비경제적이었다. 
     따라서 본 발명의 램프 콘트롤러에 의하여서는 정류된 DC전원을 공급받아 점등시키는 발광 다이오드들의 케이블을 컨넥터에 의해 간단하게 접속되도록 하고, 스위칭 소자를 다이리스터를 사용하면서 시정수 소자에 의한 주기를 갖는 펄스신호로 스위칭을 제어하도록 함으로서 다수의 발광 다이오드를 간단한 구조에 의해 안정되게 점등시킬 수 있음은 물론 점멸에 따른 작동의 제어가 용이하고, 램프 콘트롤러의 내부회로가 콤팩트화됨과 동시에 조립이 간단,신속하게 이루어져 생산성이 향상되고 그에 따른 제품의 원가 및 인건비를 절감할 수 있고, 발광 다이오드의 수명이 다하게 되면 램프 콘트롤러는 그대로 두고 발광 다이오드만 교체할 수 있다.
Patent KR-20000026848-A (KR)
Title: Method for removing developing solution for wet type printer
Inventor: LEE JIN SU
IPC: B41J2/385
Filed: 1998-10-23
Abstract: PURPOSE: A method for removing a developing solution of a wet printer is provided to simply control a jetting angle of air jetted between a photosensitive belt and a squeeze roller. CONSTITUTION: A locking projection(122) is locked in locking grooves for each color(142a,142b,142c,142d) in one-touch type by moving a lever(120) of each air pipe(100) after installing the air pipe(100) in each guide groove(144) of frames for each color(140am140b,140c,140d). Thereby air is jetted in different angles each other from a jetting nozzle of air(112) between each squeeze roller(22) and each photosensitive belt(10). The assembling time of a machinery is reduced by easily controlling the jetting angle of air by controlling and fixing the position during moving with preparing the lever(120) in the air pipe(100). And a wrap-around event is prevented by removing a developing solution flowed to the outside of an axial direction of the squeeze roller(22) by jetting air supplied in high pressure from a resource of air supply to both ends of the squeeze roller through the jetting nozzle of air(122) of the air pipe(100).
Patent KR-20000027821-A (KR)
Title: Method for forming contact hole of semiconductor devices
Inventor: CHOE YOUNG KWAN
IPC: H01L21/28
Filed: 1998-10-29
Abstract: PURPOSE: A contact hole formation method is provided to prevent a corrosion of metal wire by preventing the metal wire from reaching with moisture among atmosphere using a spacer. CONSTITUTION: A metal wire(20) and a middle insulator(30) are sequentially formed on a lower insulator(10). After forming a photoresist pattern on the middle insulator(30), a contact hole(H) is formed by etching the middle insulator(30) using the photoresist pattern(40) as a mask. A passivation layer is formed on the resultant structure. By blanket etching the passivation layer to expose the metal wire(20), spacers(55) are formed at both sides of the contact hole(H). Thereby, corrosion of the metal wire(20) existed in edge portions of the contact hole(H) is prevented by the spacers(55).
Patent KR-20000031099-A (KR)
Title: Method for forming plug of semiconductor device
Inventor: PARK RAE HAK
IPC: H01L21/28
Filed: 1998-11-03
Abstract: PURPOSE: A method for forming the plug is provided to form a polyplug by polishing an interlayer insulating film and a polysilicon through continuous chemical mechanical polishing process. CONSTITUTION: A polysilicon(24) is deposited on the upper surface of a semiconductor substrate(21), and the polysilicon on the area except the area for forming the polyplug of a cell area and the area for forming the resister of a surrounded area is etched by a photo etching method. A first interlayer insulating film is deposited on the upper surface of the semiconductor substrate, the first interlayer insulating film and the polysilicon are chemically-mechanically polished until exposing the insulated film for flattening, and a second interlayer insulating film is deposited on the upper surface of the flattened semiconductor substrate. Therefore, the damage caused by the etch-back of the polysilicon is reduced, and the generation of a void is prevented by depositing the interlayer insulating film after forming the plug in the separating area between wires, further the polysilicon and the interlayer insulating film are flattened at the same time.
Patent KR-20000032473-A (KR)
Title: Portable device for inspecting surface
Inventor: LEE IN SUNG
IPC: A61B5/103
Filed: 1998-11-14
Abstract: PURPOSE: A portable surface inspecting device is provided, which has a plurality of components within in a body case with compact size, makes exact inspection and observation possible by getting high quality of image. CONSTITUTION: A surface inspecting device comprises a body case(1) with an opened entry where a target part of a sample for examination is placed, a light generating mean including power supply(10), a light inspecting mean examining the generated light to the target part of sample, a lens assembly(30) gathering examined and reflected light to required direction, and a CCD sensor(40) changing incident light after gathered to an electric signal, creating an image and enlarging and projecting by transmitting the image to an outer monitor. The light generating mean includes a ramp generating visible rays, a filter blocking ultra violet rays and heat from the generated light, a first reflector reflecting the light vertically to the light inspecting mean and a cylinder(14) with opened entry supporting the reflector. The light inspecting mean includes acrylic light pass tube(21) inducing the incident light from the reflector to the target part of sample and lighting the target part, a light induction tube, a second reflector reflecting the incident light reflected from the target part horizontally to the lens assembly(30) and a control bar supporting the reflector.
Patent KR-20000033463-A (KR)
Title: Method for changing shape of nurbs curve
Inventor: CHOI JUNG JOO
IPC: G06F17/16
Filed: 1998-11-24
Abstract: PURPOSE: An NURBPS(Non Uinform Rational B-Spline) curve shape change method is provided to change the local shape of the curve by changing a knot position on a connection line between control points controlling an overall shape of the NURBPS curve, largely used in a CAD or CADD, in a 3 dimensional space. CONSTITUTION: An NURBPS(Non Uinform Rational B-Spline) curve shape change method comprises a 1st step of arranging a plurality of knots on a connection line between control points by using the control points and a knot vector, a 2nd step of changing a position of an arbitrary knot for changing the shape of the curve, a 3rd step of obtaining a new knot vector by using the position of the changed knot, and a 4th step of changing the shape of the curve by using the new knot vector. The 1st step includes steps of receiving the position of the control points, a dimension of the curve and the knot vector, obtaining the connection line between the adjacent control points and its length, obtaining a division rate of the connection line, and arranging knots on the connection line by using the division rate. The 3rd step includes steps of reading an index of a currently changing knot value, obtaining a length of a front and a rear linear segment using a position of a changed knot as an end point, obtaining a position ratio of the changed knot, and obtaining a changed knot value.
Patent KR-20000034347-A (KR)
Title: Compensation apparatus of amplitude of horizontal synchronous signal for hdtv
Inventor: PARK SANG JUN
IPC: H04N7/015
Filed: 1998-11-30
Abstract: PURPOSE: A compensation apparatus of amplitude of horizontal synchronous signal for HDTV is provided to output a synchronous signal corresponding the whole pulse width of the three phase synchronous signal. CONSTITUTION: A compensation apparatus of amplitude of horizontal synchronous signal for HDTV includes a synchronous splitter(650), a pulse generator(700), and an adder(750). The intermediate frequency signal is detected and converted to a digital signal. The NTSC interference signal is removed, the linear channel distortion is compensated, and the error is corrected. The HDTV outputs the original HDTV color difference signal and the luminance signal. The synchronous splitter splits the synchronous signal from the luminance signal. The pulse generator generates a pulse according to the pulse width of the reference synchronous signal. The adder adds the synchronous signal and the pulse from the synchronous splitter and the pulse generator.