baber/WOPTO huggingface dataset:
Patent KR-20000042109-A (KR)
Title: Method for exchanging information of universal serial bus
Inventor: KIM YONG SEOK
IPC: G06F13/00
Filed: 1998-12-24
Abstract: PURPOSE: A method for exchanging information of a universal serial bus(USB) is provided to reduce an idle time of the USB to improve an information exchanging speed with peripheral devices, by making information exchanges be completed by a response signal in a status message transmitting process, without transmitting response signals of the peripheral devices receiving commands and a response signal of a host personal computer(PC) after receiving data. CONSTITUTION: A method for exchanging information of a universal serial bus(USB) comprises the steps of: making a host personal computer(PC) set up command to peripheral devices through the USB; making the peripheral devices interpret the command within maximumly 3 micro seconds, and return data corresponding to the commands to the host PC; making the host PC decide whether the data corresponds to the commands to transmit status messages to the peripheral devices, and making the peripheral devices transmit response signals to the host PC, if errors are not detected.
Patent KR-20000042609-A (KR)
Title: Steel cord for tire reinforcement and its production
Inventor: KIM HONG KI
IPC: D07B7/10
Filed: 1998-12-26
Abstract: PURPOSE: A process for producing a steel cord by carrying out a thermal diffusion process in a low temperature and for a short maintaining time compared to conventional methods is provided which prevents the degradation of tensile strength. CONSTITUTION: In a steel cord for reinforcement of a tire formed a brass plated layer on the surface of a steel cord, the copper content at a depth of 1/5 under the surface of a brass plated layer is 60 to 70% , the copper content at a depth of remaining 4/5 is more than 80% and the copper content of the total plated layer is more than 80%. In a process for forming a brass plated layer on the surface of a steel cord, a copper plated layer and zinc plated layer are formed on the surface of a steel cord in regular succession and a thermal diffusion is carried out at 400°C for 3 to 5 sec.
Patent KR-20000042840-A (KR)
Title: Discharge channel of compression refrigerant of wobble plate type compressor
Inventor: LIM KWON SU
IPC: F04B27/08
Filed: 1998-12-28
Abstract: PURPOSE: A discharge channel of a compression refrigerant of a compressor is provided to reduce pulsation noise due to a difference of pressure by discharging refrigerant with a same pressure via separately formed first and second passages. CONSTITUTION: A discharge channel of a compression refrigerant of a compressor includes a front housing having a low pressure chamber for introducing external refrigerant and a high pressure chamber for compressing refrigerant, both defined by a circle partitioning wall protruded from an inner wall of a main body, a rear housing(9) having a low pressure chamber(92) for introducing external refrigerant and a high pressure chamber(93) for compressing refrigerant, both defined by a partitioning wall protruded from an inner wall of a main body, a first passage(95) formed from the high pressure chamber to a manifold(94) at an upper part of the main body for discharging the refrigerant compressed in the high pressure chamber outside the main body, and a second passage(96) formed from an inner wall between the pressure chambers to the manifold for discharging the refrigerant compressed in the front housing to the manifold via a cylinder, and a pair of cylinders having conveyance guiding holes at predetermined positions in blocks for guiding the compressed refrigerant discharged from the high pressure chamber of the front housing to the second passage of the rear housing.
Patent KR-20000043221-A (KR)
Title: Fabrication method of transistor of semiconductor device
Inventor: KIM YONG TAEK
IPC: H01L29/786
Filed: 1998-12-28
Abstract: PURPOSE: A fabrication method of a transistor in a semiconductor device is provided to prevent a lowering of characteristics of the transistor caused by a formation of gate sidewall spacers. CONSTITUTION: A fabrication of a transistor begins with the formation of an N-well(2), a P-well(3) and an R-well(4) in a semiconductor substrate(1). Then, an isolation layer(5) defining an active region is formed on the substrate(1). Next, a gate oxide and a conductive layer are stacked on the substrate(1) and then etched by using a photoresist pattern until a remaining oxide layer(8) is reduced to a thickness of 30 to 80 angstrom, so that gate electrodes(6) are formed. Next, after lightly doped regions(20) of N-type are formed in the respective wells(2,3,4), polymer is generated from the photoresist pattern and thereby gate sidewall spacers of polymer are formed. The photoresist pattern is then removed, and high dopant implantation using the polymer spacers as a mask is performed. Therefore, heavily doped regions(30) are formed in the respective wells(2,3,4). Finally, the polymer spacers are removed.
Patent KR-20000043420-A (KR)
Title: Strip caster system by using linear motor type electromagnetic pump
Inventor: KWON YEONG SEOB
IPC: B22D11/04
Filed: 1998-12-29
Abstract: PURPOSE: A strip caster system is provided to illuminate problems such as a texturing work of a side plate and twin roll surface by using a new linear motor type electromagnetic pump. CONSTITUTION: A linear motor type electromagnetic pump(12) is formed outside a mold(10), and molten steel flowed into the mold through the linear motor type electromagnetic pump is pumped downward. The linear motor type electromagnetic pump is substituted for the existing twin roll so that a roll texturing work is not needed. Accordingly, the production cost of the strip cast by using the linear motor type electromagnetic pump is cheaper than that of the existing method. In addition, there is no a consumptive product and the cost to maintain a process is saved.
Patent KR-20000043510-A (KR)
Title: Absorption type cooling and heating system
Inventor: KANG IN SEOK
IPC: F25B15/00
Filed: 1998-12-29
Abstract: PURPOSE: An absorption type cooling and heating system by absorption is provided to keep temperature of refrigerant vapor which is low relatively to weaker solution, in high temperature and to also keep the entire temperature of mixing fluid of the weaken solution and refrigerant vapor, in high temperature, in order to reduce heat capacity. CONSTITUTION: Coolant vapor from a heat exchanger(5) is heat-exchanged with the portion of which temperature is high relatively to refrigerant vapor without inletting refrigerant vapor into the upper end of a GAX(generated absorption heat exchanger)(7). A combustor is sufficiently in high temperature to reheat refrigerant vapor by using a boiler typed burner and a fin-tube typed heat exchanger as a regenerator. Thus, the refrigerant vapor is reheated by installing a refrigerant vapor heater(101) in the upper part of the regenerator of the combustor.
Patent KR-20000045273-A (KR)
Title: Method for manufacturing capacitor
Inventor: AHN JAE MIN
IPC: H01L27/04
Filed: 1998-12-30
Abstract: PURPOSE: A method for fabricating a capacitor is provided to simplify the manufacturing process of the capacitor by forming an oxide layer of a spacer in a simple heat treatment process without performing a separate oxidation process. CONSTITUTION: An oxide layer(11) is formed on a silicon substrate(10). A contact hole(12) is formed on the oxide layer(11). The contact hole(12) is filled up with a polysilicon(13). After depositing a diffusion restraining films(14,15) on the polysilicon(13), a lower electrode film(16) and a hard mask(17) are deposited on the diffusion restraining films(14,15). Then, the hard mask(17), the lower electrode film(16) and the diffusion restraining films(14,15) are etched. After that, a heat treatment process is performed in an oxygen atmosphere so that a spacer oxide layer(18) is formed on a side wall of the diffusion restraining films(14,15). Then, the mask(17) is removed and an upper electrode film(20) is deposited on an upper portion of the structure.
Patent KR-20000045385-A (KR)
Title: Method for manufacturing semiconductor device
Inventor: BAEK SEUNG WON
IPC: H01L21/76
Filed: 1998-12-30
Abstract: PURPOSE: A method for manufacturing a semiconductor device is provided to save the manufacturing time and cost of the semiconductor device by reducing the manufacturing process of the semiconductor device. CONSTITUTION: A trench(12) is formed on an isolation region of a cell area of a semiconductor substrate(10), wherein the trench(12) is also formed on an overlay measuring area(MA). A sacrificial oxide layer(14) is formed on the structure. A photoresist pattern(18) for forming a well is formed to expose the trench(12) of the cell area, wherein the trench(12) of the overlay measuring area(MA) is not exposed. Then, impurities are implanted into the semiconductor substrate(10) exposed by the photoresist pattern(18). The trench(12) is filled by an oxide layer(24). After removing the photoresist pattern(18) and the oxide layer(24), the oxide layer(24) protruded towards an upper portion of the trench(12) is removed by a CMP process.
Patent KR-20000045775-A (KR)
Title: Ipc interface of switching system
Inventor: JEONG IN CHEOL
IPC: H04Q3/00
Filed: 1998-12-30
Abstract: PURPOSE: An IPC(Inter Processor Communication) interface of the switching system is provided to inspect a standby IPC path while executing switching interface for an active IPC path in normal state and to achieve the IPC communication of a standby processor, according to the necessity. CONSTITUTION: Between a main switching module(10) and a central data link module(60a) and between a sub switching module(40) and a sub data link module(60b), U-link cables are provided to connect in a cross-duplicated structure. The central data link module(60a) and the sub data link module(60b) are connected through the optical cable for the data transmission of high speed. A central data link module A and a sub data link module A are embodied as an active link(100a). A central data link module B and a sub data link module B are embodied as a standby link(100B).
Patent KR-20000046961-A (KR)
Title: Burn-in test vcp voltage controller of memory device
Inventor: CHO JEONG HWAN
IPC: G01R31/28
Filed: 1998-12-31
Abstract: PURPOSE: A burn-in test VCP voltage controller is provided to enhance the reliability of tests by performing burn-in tests through the selection of an appropriate value for the test environments. CONSTITUTION: A plurality of transfer transistors(12, 14, 16, 18) transfer the Vcp of plural voltage levels. A multiplexer(20) selectively operates the plural transfer transistors(12, 14, 16, 18). The multiplexer(20) receives two control signals and outputs four signals(a, b, c, d). The output value(a, b, c, d) of the multiplexer(20) becomes '0001' when the control signal is '00'. At this time, the transistor(18) is turned on so that the potential value of the Vcp<3> is outputted to the Vcp_out. The voltage applied to a cell plate becomes the voltage of the Vcp<3>.
Patent KR-20000047337-A (KR)
Title: Brazing material for manifold joining of heat exchange flowing plate and manifold joining method of heat exchange flowing plate
Inventor: KIM IN GAB
IPC: F28F9/00
Filed: 1998-12-31
Abstract: PURPOSE: A brazing material for manifold joining of a heat exchange flowing plate and a manifold joining method of the heat exchange flowing plate are provided to expand a joining area between manifolds of a heat exchange tube and a pipe by inserting the brazing material on the manifold deeply so that the manifolds and surrounding parts of through holes are reinforced, thereby durability of the manifolds. CONSTITUTION: A manifold joining method of a heat exchange flowing plate by using a brazing material(4), which is formed in the shape of ring for joining two semi-circular manifolds(35) by being inserted around peripheries of the manifolds and cut according to a shape of an edge part of through holes(33) formed in cups(32) positioned at one sides of two manifold plates, wherein a length of the insertion is extended to the edge part of the through hole, includes the steps of forming a manifold by contacting the two semi-circular manifolds formed on the two manifold plates, inserting the brazing material outside the manifolds in such a manner that a section formed with the cutting part(41) is positioned at the edge part of the through hole, and joining the two semi-circular manifolds by melting the brazing material by brazing.
Patent KR-19990036376-A (KR)
Inventor: EIICHI MIYASHITA
IPC: H02K1/14
Filed: 1997-06-13
Abstract: 본 발명은 간이한 구조로, 내요크와 외요크의 위치어긋남을 방지하고, 스테핑 모터의 모든 특성을 향상시키는 것을 과제로 하고 있다. 그를 위해 스테핑 모터(1)는, 고정자(2)와, 고정자(2)의 양단에 각각 고착된 저판(7) 및 설치판, 베어링(9a,9b)과, 설치판(8)에 고착된 홀더(10)와, 회전자(6)의 회전축(61)에 설치된 리드 스크루(14)로 구성되어 있다. 고정자(2)는 1세트의 내요크(3)와, 외요크(4) 및 이들 사이에 설치되는 코일(5)을 2세트 준비하고, 이들을 내요크(3)의 기부(31)끼리가 접합되도록 고착되어 있는 것이다. 내요크(3)와 외요크(4)는 내요크(3)의 기부(31)가 외요크(4)의 외주부(42)의 단부(421)에 맞닿고, 또한 기부(31)의 외주 모서리부(32)가 외요크(4)의 외주면 부분에 노출하도록 접합되어 있다.
Patent KR-19990064227-A (KR)
Title: 덜 중요한 문자를 파괴하여 동등하지 않은 에러보호를 제공하는코딩시스템 및 방법
IPC: H04L1/00
Filed: 1996-10-11
Abstract: 본 발명은 송신기로부터 디지털 시스템의 수신기로 전송될 디지털 메세지의 중요하지 않은 문자와 중요한 문자 모두를 에러보호하는 코딩시스템에 관한 것이다. 중요하지 않은 문자와 중요한 문자 모두에 대한 에러보호는 송신기에서 디지털 메세지를 형성하는 메세지 블록의 중요한 문자와 중요하지 않은 문자 모두를 코딩함으로써 제공된다. 균등하지 않은 에러보호가 코드된 신호의 각각의 코드워드의 선택된 다수의 중요하지 않은 문자를 파괴함으로써 중요한 문자에 제공된다. 수신기에서, 수신된 코드워드의 지움과 에러가 보정가능한지에 대한 보정결정이 각각의 코드워드에 대해 이루어진다. 보정결정은 에러의 수, 지움의 수, 및 코드의 최소거리의 함수이다. 보정결정을 기반으로, 수신된 코드워드가 비파괴되고 코드된다. 바람직하기로는, 파괴된 문자가 지움으로 간주되는 Berlekamp 디코드 가능한 코드와 같은 리드 솔로몬을 이용하여 파괴가 수행된다. 다음, 파괴된 메세지가 시퀸스 추정 비터비형 디코딩에 의해 디코드된다.
Patent KR-19990076651-A (KR)
Title: 절제 및 응고가 동시에 일어나는 절제경 전극어셈블리
IPC: A61B17/00
Filed: 1996-12-19
Abstract: 절제경(18)의 전극 어셈블리는 루프 말단 팁과 제 1 파워 밀도를 가지고 있는 절제 전극(1)을 포함하고 있다. 응고 전극(2)은 루프 말단 팁과 제 1 파워 밀도보다 적은 제 2 파워 밀도를 가지고 있다. 지지 프레임은 에너지 원(24)으로부터 절제 및 응고 전극(1, 2)으로 에너지를 공급하기 위하여 절제 및 응고 전극(1,2) 및 에너지 원(24)에 연결되어 있다. 상기 응고 전극(2)은 절제 전극(1)이 조직을 절제함과 동시에 조직을 응고시킨다. 절제경(18)은 전극 어셈블리를 포함하고 있는 상태로 개시되어 있다. 상기 절제경은 덮개 구경(14a,14b)을 구비하고 있는 덮개(14), 작업 요소(15) 및 시각화 장치(16)를 포함하고 있다.
Patent KR-20000005329-A (KR)
Title: Catalytic hydrogenolysis of organic thiocyanates and disulfides to thiols
Inventor: JACOBSON STEPHEN ERNEST
IPC: C07C319/06
Filed: 1997-04-04
Abstract: PURPOSE: Traditional manufacturing process of organic thiol is dangerous by using Thiourea, which is a carcinogenic substance, and needs many devices such as incinerator for safety. CONSTITUTION: A thiol manufacturing process comprises reacting hydrogen with a thiocyanate or disulfide. In the reaction with thiocyanate is conducted under the present of a catalyst, containing a Group VIII metal or a mixture of this metal group. And in the reaction with thiocyanate or with disulfide is conducted in the presence of a catalyst, consisted of a Group VIII metal or mixture thereof, or under the condition that in the presence of catalyst, being on a porous insoluble support and comprising of a modifier metal selected from a group consisting of Group IB, Group IIB, Group IIIA, Group IVA, Group VA and Group VIA metal or mixture thereof.
Patent KR-20000015926-A (KR)
Title: Telephone doubler arrangement
Inventor: TWENBY INGMAR
IPC: H04M3/38
Filed: 1997-06-03
Abstract: PURPOSE: Disclosed is a telephone doubler arrangement for providing telephone service to a subscriber having Internet session with an Internet access server over an IP link established over a connection in the telephony network. CONSTITUTION: A telephony application (11) allowing for voice transmission over said IP connection is running on the computer (2). In accordance with the invention a telephony server (10) is provided. The telephony server (10) has access to the public network and to an Internet access server (8). Upon start up of the telephony application the telephony server requests forwarding of calls to the subscriber's own telephone number to go to the telephony server from which they are transported over the IP access server to the subscriber's computer. Speech is transported as compressed audio in a manner known prior arts.
Patent KR-19990030477-A (KR)
Title: 액정표시장치용 고분자 조합 액정
Filed: 1999-01-09
Abstract: 목적 : 강유전성 및 반강유전성 액정을 사용하여 고분자에 대한 액정의 혼합비를 낮추면서도, 응답 속도가 빠르고 광학적으로 안정하고 콘트라스트가 뛰어난 액정표시장치용 고분자 조합 액정을 제공한다. 
     구성 : 강유전성 액정 및 반강유전성 액정 40 wt% 이하와 고분자 60 wt% 이상으로 되는 액정표시장치용 고분자 조합 액정. 고분자는 우레탄 아크릴레이트 계열의 올리고머와 아크릴레이트 혹은 메타크릴레이트 계열의 모노머가 중합되어 얻어진다. 
     효과 : 거시적 자발분극을 갖는 강유전성 액정과 반강유전성 액정을 사용하여 광을 투과하거나 차단하는 선택 특성이 향상되어서 온/오프시의 콘트라스트가 향상되며, 응답 속도가 빠르고 아울러 고 투과율과 넓은 시야각을 유지한다. 소량의 액정을 사용하므로 제조 비용을 낮출 수 있으며 노화를 억제할 수 있다.
Patent KR-20000055105-A (KR)
Inventor: LEE SANG U
IPC: C09J123/08
Filed: 1999-02-03
Abstract: PURPOSE: An adhesive polyolefin resin composition which minimizes the gel formation and a polyolefin film using thereof which has excellent adhesiveness and water-resistant property are provided. CONSTITUTION: A adhesive polyolefin resin composition comprises: (i) 5-20 wt.% of grafted high density polyethylene which is prepared by grafting 0.25-5 wt.% regarding a high density polyethylene of more than one grafting monomer comprising an ethylene unsaturated carboxylic acid, an ester of an ethylene unsaturated carboxylic acid, an anhydride of an ethylene unsaturated carboxylic acid in the high density polyethylene by using a reaction initiator which is immersed in a porous polypropylene powder resin at a concentration of 4.5-5.5 wt.%; (ii) 60-94.9 wt.% of a low density polyethylene, a linear low density polyethylene, a high density polyethylene or a polypropylene; and (iii) 0.1-20 wt.% of an adhesive material. The adhesive polyolefin film is prepared by using the adhesive polyolefin resin composition.
Patent KR-19990073007-A (KR)
Title: 특정한고온중합체를포함하는용사분말및이를용사하는방법
IPC: C23C4/12
Filed: 1999-02-27
Abstract: 산화 폴리아릴렌 설파이드 분말, 및 산화 폴리아릴렌 설파이드 1 내지 99중량%와 금속, 탄화물, 세라믹 또는 고온 폴리이미드, 폴리아미드 이미드, 폴리에스테르 이미드 및 방향족 폴리에스테르 플라스틱 또는 이들의 혼합물 1 내지 99중량%를 포함하는 분말은 용사(thermal spraying)에 사용하기에 매우 적합하며, 고온 및 저온에 노출되는 경우, 화학적 및 기계적 내성이 강하고 치수 안정성이 우수한 피복물을 형성한다. 이러한 피복물은, 가스 터빈 엔진, 자동차 터보차저 및 슈퍼차저의 컴프레서 섹션에 있어서 마모성 실 클리어런스 제어 피복물로서 사용하기에 유리하고, 반응 용기, 주방용품, 실링 또는 베어링 피복물로서 사용하기에도 유용하다.
Patent KR-20000060096-A (KR)
Inventor: NAMKOONG DON
IPC: H01L21/68
Filed: 1999-03-11
Abstract: PURPOSE: Am apparatus for guiding a wafer used in a semiconductor device manufacturing process is provided to reduce the set-up time of the wafer guiding apparatus by checking the horizontal state of the wafer guiding apparatus. CONSTITUTION: A wafer guiding apparatus comprises a front plate(12) and a rear plate(14) which are spaced from each other by a predetermined distance. A plurality of fixing bars(16a,16b) are provided. One end of the fixing bars(16a,16b) is coupled to the front plate(12) and the other end of the fixing bars(16a,16b) is coupled to the rear plate(14). A plurality of slots(18) into which wafers are inserted are formed in the fixing bars(16a,16b). Horizontal state measuring instruments(20,22) are coupled to the front plate(12), the rear plate(14) and the fixing bars(16a,16b) so as to check the horizontal state of the wafer guiding apparatus.
Patent KR-19990046543-A (KR)
Title: 의사에의한피씨통신을이용한진료예약시스템
Filed: 1999-03-27
Abstract: (1) 발명이 속한 기술분야 : 정보 통신 분야 
     (2) 발명의 목적 
     환자의 시간적, 경제적 낭비를 줄일 수 있고, 
     환자의 적절한 진료를 위한 예약을 할 수 있고, 
     의료 전달체계의 발전을 이룰 수 있다. 
     (3) 발명의 구성 
     44개 국내 3차 진료기관의 의료진에 대한 정보를 1,2차 진료기관에 제공하고, 44개 3차 진료기관의 진료예약 시스템과 PC통신의 특정 웹사이트를 연결하여 1,2차 진료기관에서 진료를 받았던 환자가 3차 진료기관에서 진료를 요하는 경우 환자나 보호자가 원할 때 1,2차 진료기관의 의사가 직접 진료 예약을 해줄 수 있도록 한다. 
     (4) 발명의 효과 
     *의사(특히 전문의)에의한 예약으로 적절한 진료를 받을 수 있고, 
     *보호자나 환자가 직접 예약할 때의 시간적,경제적 손실을 줄일 수 있고, 
     *원거리 환자의 경우 보다 신속한 진료를 받을 수 있고, 
     *환자와 의사간의 신뢰감이 깊어 질 수 있고, 
     *검사결과를 보다 신속하고 정확히 참고하므로서 추후 그 환자진료에 도움이되고 진료비 상승을 줄일 수 있다.
Patent KR-19990078439-A (KR)
Title: 전구형 형광램프 및 조명기구
IPC: H05B41/298
Filed: 1999-03-31
Abstract: 형광발광관의 수명말기시에 있어서, 조기에 점등회로의 동작을 정지시킨다. 
     형광발광관(14)의 전극 측단면의 거의 전체를 덮도록 기판(15a)을 기본체 (11b) 내에 부착하고, 형광발광관(14)을 작동시키는 고주파를 생성하여 형광발광관 (14)의 수명말기시에 있어서의 형광발광관(14)의 전극의 온도상승에 의해 파괴되는 위치에 점등회로(15)의 스위치소자(SN,SP)를 배설한다. 형광발광관(14)이 수명말기가 되어 반파방전 등을 일으킨 경우, 형광발광관(14)에 인가되는 점등전압이 증대하여 전극의 온도가 상승하고, 전극의 온도상승에 따라 스위치소자(SN,SP)가 가열되어 파괴되며, 이에 따라 점등회로(15)의 동작이 정지되어, 형광발광관(14)의 수명말기시에 있어서의 열적인 불량의 발생이 방지된다.
Patent KR-20000065361-A (KR)
Inventor: KIM WON MU
IPC: H04B17/00
Filed: 1999-04-02
Abstract: PURPOSE: A call processing performance tester using loopback in the mobile communication system and the method thereby are provided to carry out a call processing performance test by two-way communication as a base station controller processes mobile-to-mobile calls without inter-working with the exchange and to execute a performance test for a specific vocoder by making a specific call looped back even in normal call processing. CONSTITUTION: A call processing part(10) controls an overall call processing operation in a base station controller. A TSB(Transcoder Selector Bank)(20) controls and manages calls and control data inputted through the call processing part(10) and carries out a loopback function for mobile-to-mobile calls or a specific call. The TSB(20) is comprised of an input part(21), an output part(22), an input/output buffer(23), a detection part(24), a control part(25) and a switching part(26). A vocoder(30) decodes call data, assigned to an associated channel on the E-1 link, inputted from the exchange and outputs it to the TSB(20).
Patent KR-20000067332-A (KR)
Inventor: OH DAE IL
IPC: H04N19/89
Filed: 1999-04-27
Abstract: PURPOSE: An apparatus for traceback of a trellis decoder is provided to use one port RAM with a decision depth for survivor path information storage and perform one traceback for every 4 symbols. CONSTITUTION: An apparatus for traceback of a trellis decoder includes a memory(40), a multiplexer(50), a traceback device(60), a modulo-22 counter(30) and a control signal generator(80). The memory(40) stores survivor path information to a decision depth of input symbols. The multiplexer(50) decodes the survivor path information output from the memory. The traceback device(60) receives lower bits of the survivor path information and a status output value of itself and performs a status transition process while tracing back a decoding value of the lower bits. The modulo-22 counter(30) counts input symbols. The control signal generator(80) generates a traceback control signal for every 4 symbols based on a count value output from the modulo-22 counter, controls the traceback device and controls the multiplexer so as to decode 8-bit data during tracing back.