baber/WOPTO huggingface dataset:
Patent JP-2005173331-A (JP)
Title: Fixing device
Inventor: SHIRAI MASASHIGE
IPC: G03G15/20
Filed: 2003-12-12
Abstract: <P>PROBLEM TO BE SOLVED: To provide a fixing device of an electromagnetic induction heating system realizing energy saving and space saving as a fixing device using an electromagnetic induction heating system as a heat source.  <P>SOLUTION: The fixing device 1 constituted so that the electromagnetic induction heating element is an endless belt and is included in a magnetic field generation means has the magnetic field generation means, the electromagnetic induction heating element realizing electromagnetic induction heating by the action of magnetic field generated by the magnetic field generation means, and a pressure roller 3 press-contacting with the electromagnetic induction heating element and forming a nip part. In the fixing device 1, recording material is introduced and carried in the nip part so as to fix an image on the recording material with the heat of the electromagnetic induction heating element and the pressure of the pressure roller. Then, the fixing device has the turnable endless belt type electromagnetic induction heating element 8, and is provided with the magnetic field generation means in which the electromagnetic induction heating element is included and whose cross-sectional shape is nearly U-shaped.  <P>COPYRIGHT: (C)2005,JPO&NCIPI
Patent JP-2005168996-A (JP)
Title: Vacuum cleaner
Inventor: KOKUNI YAYOI
IPC: A47L9/10
Filed: 2003-12-15
Abstract: <P>PROBLEM TO BE SOLVED: To provide a vacuum cleaner capable of increasing the quantity of dust reserved in a dust collection part and maintaining high suction power while reducing the frequency of discharging dust from a dust collection cup.  <P>SOLUTION: The dust collection cup 5 has a switching valve 36 in a junction 35 between a first exhaust channel 29 connected to a first vent 25 formed in an upper swing part 22 and a second exhaust channel 34 connected to a second vent 32 with a filter 31 on a front stage, formed in the lower dust connection part 23. The switching valve 36 can be controlled to open the first exhaust channel 29 when dust is sucked and to open the second exhaust channel 34 when dust is not sucked.  <P>COPYRIGHT: (C)2005,JPO&NCIPI
Patent JP-2005176256-A (JP)
Title: Optical transmission system
Inventor: NAGASOE KAZUFUMI
IPC: H04B10/11
Filed: 2003-12-15
Abstract: <P>PROBLEM TO BE SOLVED: To provide an optical transmission system capable of reducing the influence of communication control on lighting control by suppressing optical output variations in a discharge lamp at information transmission without extending a lighting frequency range.  <P>SOLUTION: The optical transmission system is provided with: a discharge lamp lighting apparatus 1 consisting of a switch element SW 11 ON/OFF-operated according to a control signal, a resonance circuit section 110 for converting a DC power DC into a high frequency power in interlocking with the ON/OFF operation and supplying the resultant high frequency power to the discharge lamp DL, and a control circuit section 12 for outputting a control signal of controlling the ON/OFF operation of the switch element 11 to the switch element 11 so as to supply a current with a lighting frequency higher than the resonance frequency to the discharge lamp DL and for further outputting a control signal of controlling the ON/OFF operation of the switch element 11 to the switch element 11 so as to supply a current of the lighting frequency or either of two kinds of frequencies within the range of the lighting frequency to the discharge lamp DL depending on the transmission information; and a receiving terminal for receiving the transmission information included in an optical output of the discharge lamp DL under the control of the control circuit section 12 in response to the transmission information.  <P>COPYRIGHT: (C)2005,JPO&NCIPI
Patent JP-2004211278-A (JP)
Title: Cellulose fatty acid ester fiber and process for producing the same
Inventor: YAMADA HIROYUKI
IPC: C08L1/10
Filed: 2003-12-16
Abstract: <P>PROBLEM TO BE SOLVED: To provide a cellulose fatty acid ester excellent in mechanical properties as a fiber and excellent in process passableness, in an effective producing method by a melt spinning without giving the impact on the environment.  <P>SOLUTION: The cellulose fatty acid ester fiber comprises a composition comprising 80-98 wt.% of the cellulose fatty acid ester wherein at least a part of the acyl group in the cellulose fatty acid ester has 3 to 18 carbons and 2-20 wt.% of a polyhydric alcohol based plasticizer. The strength S (cN/dtex) and elongation E (%) of the fiber satisfy following formulas; 6≤S×E<SP>1/2</SP>≤10, 15≤E≤50.  <P>COPYRIGHT: (C)2004,JPO&NCIPI
Patent JP-2005177554-A (JP)
Title: Fluid separating filter
Inventor: SAGOU FUMIAKI
IPC: B01D71/02
Filed: 2003-12-16
Abstract: <P>PROBLEM TO BE SOLVED: To provide a fluid separating filter excellent in water resistance and improved in deterioration of permeation characteristic by reducing the influence of moisture.  <P>SOLUTION: A ceramic fluid separation membrane consisting of at least one metallic component of Si, Ti and Zr and an element of group IIIa in the periodic table is formed on at least a part of the surface of a porous support. It is particularly preferable that the element of group IIIa in the periodic table is at least one of Lu, Yb, Dy, Sm, Er and Eu and the separation membrane consisting of the metallic component of Si, Ti or Zr is an amorphous material.  <P>COPYRIGHT: (C)2005,JPO&NCIPI
Patent JP-2005180984-A (JP)
Title: Equipment for conveying radioactive material storage container, and its storage system
Inventor: HOSHIKAWA TADAHIRO
IPC: G21F9/36
Filed: 2003-12-17
Abstract: <P>PROBLEM TO BE SOLVED: To provide radioactive material storage container conveyance equipment and its storage system, capable of compacting a conveyance device of a radioactive material storage container, thereby reducing and compacting its storage area and the area necessary for conveyance.  <P>SOLUTION: This radioactive material storage container conveyance equipment is equipped with an air pallet for reducing the frictional coefficient of the radioactive material storage container, and a driving device for driving the radioactive material storage container. The equipment is also equipped with a compressed air supply source means for supplying compressed air to the air pallet and to the driving device. The compressed air supply means supplies the compressed air by using liquified air so that the radioactive material storage container can be conveyed independently.  <P>COPYRIGHT: (C)2005,JPO&NCIPI
Patent JP-2005177027-A (JP)
Title: Slot machine using game balls
Inventor: UGAWA SHOHACHI
IPC: A63F5/04
Filed: 2003-12-17
Abstract: <P>PROBLEM TO BE SOLVED: To provide a slot machine using the game balls which can reduce the production costs while avoiding a sort of adverse pressure in the internal space of a cabinet due to the complication of the internal structure of the cabinet.  <P>SOLUTION: In the slot machine using the game balls, the setting of the prescribed number of bets for one game using the game balls makes the game ready to start, one game is ended by deriving and displaying the result of the display on the variable display device capable of variably displaying many kinds of identifying information identifiable individually and the winning is made possible according to the results of the display on the variable display device. The intake of the game balls is made with an intake device 100 in response to the operation of a clearing operation means 10 which is operated in the clearance of the game balls (withdrawal of balls) in standby on an upper tray 12 while the number of intake balls which is taken in with the intake device 100 and detected by an intake ball detection means is put out onto a lower tray 11 with a put-out device 200 for putting out the prize balls according to the winning.  <P>COPYRIGHT: (C)2005,JPO&NCIPI
Patent JP-2004145900-A (JP)
Title: Case for memory card
Inventor: KAWAKAMI TAKASHI
IPC: G06K19/00
Filed: 2003-12-22
Abstract: <P>PROBLEM TO BE SOLVED: To provide a case for a memory card in which a memory card can be housed by facilitating the taking out of the memory card.  <P>SOLUTION: In this case for the memory card, a tray 3 is mounted in a case body 2 of the figure, and fitting recesses 4 are also formed in the tray 3 so as to be able to house a memory card M in each of the fitting recesses 4. The case for a memory card is provided with a locking recess 4 capable of locking the memory card M housed in the fitting recess 4 of the tray 3 and with an extrusion button 41 at an almost central part of the fitting recess 4 of the tray 3. Further, holes 2a are formed at positions corresponding to the extrusion buttons 41 of the case body 2, and the locking of the memory card M by a locking projection 42 of the fitting recessed part 4 is released by pushing the extrusion button 41 from the bottom side of the case body 2.  <P>COPYRIGHT: (C)2004,JPO
Patent JP-2005182616-A (JP)
Title: Method, device, system, and program for supporting practical use of possessed technology
Inventor: WATANABE HIROSHI
IPC: G06Q10/00
Filed: 2003-12-22
Abstract: <P>PROBLEM TO BE SOLVED: To obtain a method, a device, a system, and a program for supporting practical use of possessed technology, which allow a possessed technology to be effectively used in accordance with the actual effectuality.  <P>SOLUTION: A server device 20 stores information relating to the possessed technology, which is acquired from a technology developer in a technology development division through a client device 30 in a hard disk, and information relating to the possessed technology, which is stored in the hard disk is presented in response to a request from the server device 20, the client device 30, or a client device 40, and a technology user in a technology use division inputs evaluation information representative of evaluation of the possessed technology when applying the presented possessed technology, through the client device 40, and the inputted evaluation information is stored in the hard disk in relation to the corresponding possessed technology, and information based on the evaluation information stored in the hard disk is presented in response to a request from the server device 20, the client device 30, or the client device 40.  <P>COPYRIGHT: (C)2005,JPO&NCIPI
Patent JP-2005177278-A (JP)
Title: Chair type massage machine
Inventor: YODA HIROKI
IPC: A61H7/00
Filed: 2003-12-22
Abstract: <P>PROBLEM TO BE SOLVED: To provide a chair type massage machine enabling a user to stop the machine and to take evacuating actions even in case of emergency due to abnormal operations or poor physical conditions.  <P>SOLUTION: The chair type massage machine is provided with a seat surface 3, a backrest 2 and armrests 4, and arm massage parts provided on the armrests 4 on both sides and for pressurizing and massaging arms held by arm holding parts. In the chair type massage machine, when the arm massage parts of the armrests 4 on both sides simultaneously massage the arms on both sides, pressurizing forces for the arms are controlled so as to be changed for both arms so that the pressurizing force for one arm becomes such pressure that the arm can be detached from the arm holding part.  <P>COPYRIGHT: (C)2005,JPO&NCIPI
Patent JP-2005178692-A (JP)
Title: Following distance control device
Inventor: TERADA MASASHI
IPC: F02D29/02
Filed: 2003-12-22
Abstract: <P>PROBLEM TO BE SOLVED: To perform following distance control such that a following vehicle is not covered in exhaust gas of a preceding vehicle.  <P>SOLUTION: A preceding vehicle following travel control device is a device for controlling own vehicle speed such that the following distance with the preceding vehicle becomes a predetermined following distance. When an exhaust gas sensor detects the exhaust gas from the preceding vehicle in a predetermined amount or higher (step S22), the device changes a predetermined following distance to a larger value (step S24) and changes a control gain of travel speed control to a smaller value (step S25).  <P>COPYRIGHT: (C)2005,JPO&NCIPI
Patent JP-2005191622-A (JP)
Title: Av monitoring apparatus
Inventor: KOMATSUDA SADANOBU
IPC: H04N5/907
Filed: 2003-12-24
Abstract: <P>PROBLEM TO BE SOLVED: To provide the problem of troublesomeness in connecting cables and unusability of a user interface of a small apparatus in configuring a network between AV apparatuses.  <P>SOLUTION: This apparatus is provided with a general-purpose radio unit such as Bluetooth (R) or a radio LAN capable of a network between a plurality of AV apparatuses in addition to a display device capable of displaying information on each of devices and a memory capable of recording motion and still images, so that the delivery of information between the apparatuses can be intensively performed. For example, this AV monitoring apparatus 100 enables a video camera 200, a digital camera 300 and a printer 400 to share a display monitor. The apparatus 100 further receives motion and still images from the video camera 200 or the digital camera 300 to record the images in a memory, allows an arbitrary apparatus to deliver a still image to another arbitrary apparatus, and can instruct a control operation such as recording start, camera setting, print setting and printing start.  <P>COPYRIGHT: (C)2005,JPO&NCIPI
Patent JP-2004089742-A (JP)
Title: Drum type washing and drying machine
Inventor: OYAMA YUICHI
IPC: D06F25/00
Filed: 2003-12-25
Abstract: <P>PROBLEM TO BE SOLVED: To provide a drum type washing and drying machine that assures a hot air pathway at the time of drying process and that has a function of preventing an accident especially when drying operations are performed repeatedly.  <P>SOLUTION: The machine consists of a tank 2, a rotating drum 5 installed to freely rotate in the tank 2, a hot air supply means 50 for supplying hot air to dry a wash in the rotating drum 5, temperature sensors 55 and 56 for sensing the temperature of the hot air, and a storing means for storing a history of drying operation. When the sensors 55 and 56 sense a predetermined temperature of the hot air, a predetermined temperature increase rate or a predetermined value of the drying operation history, the operation is stopped as an abnormal state or an alarm of abnormal operation is activated.  <P>COPYRIGHT: (C)2004,JPO
Patent JP-2005186772-A (JP)
Title: Device for shielding hull opening
Inventor: SATO KENJI
IPC: B63B19/08
Filed: 2003-12-25
Abstract: <P>PROBLEM TO BE SOLVED: To provide a device for shielding a hull opening capable of smoothly opening/closing a large-sized door.  <P>SOLUTION: The device 1 for shielding a hull opening which moves a door 5 between a closed position to shield the opening 3 and a fully opened position along the sealing component 19, comprises a pair of knuckle type track ways 10 placed along the opening 3 and a hull sealing component 19; an upper roller 32 and a lower roller 8 traveling on the track ways 10 to support the door 5; first and second winches (upper roller driving mechanisms) 36, 37 driving the upper roller 32 in a traveling direction; a roller supporting stand 20 provided so as to ascend/descend along the track ways 10 and on which the lower roller 8 is placed; and a lifting jack cylinder (a door lifting driving mechanism) 21 driving the roller supporting stand 20. The lower roller 8 is placed on each roller supporting stand 20 to pass through a bending portion 17 in each track way 10.  <P>COPYRIGHT: (C)2005,JPO&NCIPI
Patent JP-2005192342-A (JP)
Title: Eccentric rotor and vibration motor employing it
Inventor: SOHARA KATSUHITO
IPC: B06B1/04
Filed: 2003-12-26
Abstract: <P>PROBLEM TO BE SOLVED: To provide an eccentric rotor which can be injection molded of resin without problems and in which the position of constituting members can be positively determined.  <P>SOLUTION: A weight 30 has a maximum thickness part 38, where at least one face is exposed from a rotor and a part embedded in a resin part 15 by C faces 32 and 33. Positioning recesses 34 and 35 are formed in the embedding part, and the position of the weight 30 is determined by the guide pin of a die at injection molding. Since recesses are provided in the embedding part, eccentricity will not be damaged at the maximum thickness part.  <P>COPYRIGHT: (C)2005,JPO&NCIPI
Patent JP-2005192067-A (JP)
Title: Audio amplifier
Inventor: NAKAGAWA YOSHIMICHI
IPC: H03G3/30
Filed: 2003-12-26
Abstract: <P>PROBLEM TO BE SOLVED: To solve a problem wherein power efficiency improvement performance is inferior since three peak detection circuits are required, and a configuration becomes complicated since a power supply voltage is variable over two stages, in a conventional audio amplifier.  <P>SOLUTION: An entire gain determination section 41 calculates an entire gain Ga from a first table storage section 42 based on an input from an input section 5 and outputs the entire gain Ga to an output peak level determination section 43 and a second gain determination section 51. On the other hand, the output peak level determination section 43 detects Vip that is information relating to a peak level of an input signal, from a peak level detection means 16 and determines an output peak level Vop based on the Vip and the value of the entire gain Ga. A control voltage determination section 47 determines a control voltage Vsi with which a variable output voltage power source 2 has a power supply voltage Vso. A first gain determination section 49 determines a first gain G1 based on the power supply voltage Vso of the variable output voltage power source 2, and a second gain coefficient determination section 52 determines a coefficient α with a gain of a second gain varying means as G2. from the second gain G2 of the second gain determination section 51.  <P>COPYRIGHT: (C)2005,JPO&NCIPI
Patent JP-2005189746-A (JP)
Title: Fixing device and image forming apparatus
Inventor: SUGIYAMA YASUHISA
IPC: G03G15/20
Filed: 2003-12-26
Abstract: <P>PROBLEM TO BE SOLVED: To uniformly form a nip area and improve image quality.  <P>SOLUTION: The fixing device includes a heat member, a belt member which is disposed in contact with the heat member and forms a fixing area between the heat member and itself, a pressure member which is disposed opposite the heat member and presses the heat member with specific pressing force via the belt member, and a pressing member which presses the pressure member. The axial distribution of the pressing force is adjusted by the pressing member. In the case, the adjustment of the axial distribution of the pressing force by the pressing member makes is possible to adjust and uniformize the distribution of the pressing force according to various recording media used. Accordingly, the nip area can uniformly be formed and image quality can be improved.  <P>COPYRIGHT: (C)2005,JPO&NCIPI
Patent JP-2004532123-A (JP)
Title: 互いに同心的に配置された２つの室を備えたカートリッジのための押出装置
IPC: B65D83/00
Filed: 2002-04-13
Abstract: 本発明は、互いに同心的に配置され、かつピストン（９，１０）によって閉鎖された２つの室（２，３）を備えたカートリッジ（１）のための押出装置であって、押出装置が、ねじ山（１２）を備えた押出棒（１１）を備えており、該押出棒（１１）が、カートリッジ（１）の後側端部に配置され、かつ雌ねじ山（１４）を備えた端部部材にねじ入れることによって軸方向可動である形式のものに関する。押出装置の簡単な製作を実現し、かつ押出装置の取扱を容易にするために、押出棒（１１）は、内側の室（２）のピストン（９）に押圧力を及ぼす内側プランジャ（１６）と、該内側プランジャ（１６）に対して同心的に配置され、かつ外側の室（３）のリング状のピストン（１０）に押圧力を及ぼす管状の外側プランジャ（１７）とを備えており、該外側プランジャ（１７）の外套面に、全長にわたって延びるねじ山（１２）が設けられている。さらに雌ねじ山（１４）を備えた端部部材が、ねじ山付リング（１３）として形成されている。押出棒（１１）のこのような構成によって、押出棒は、射出成形法で一体的な部材としてプラスチックから製作可能である。
Patent JP-2005504037-A (JP)
Title: Ｉｖ型コラーゲンｎｃ１ドメイン六量体の結晶化構造
IPC: A61P9/00
Filed: 2002-07-26
Abstract: 本発明は、ＩＶ型コラーゲンの結晶化ＮＣ１ドメイン六量体、及びその結晶の製造方法を提供し、ここでＮＣ１ドメイン六量体は、結晶化ＮＣ１ドメイン六量体の三次元構造を少なくとも３Ａ以下の解像度で決定することができるように結晶化される。本発明は、血管新生、腫瘍増殖、腫瘍転移、内皮細胞接着及び／または増殖、及び／または基底層構築を阻害するように化合物を設計するための方法であって、本発明の方法によって生成される結晶化ＩＶ型コラーゲンＮＣ１ドメイン六量体の三次元構造を解析し、並びにその解析によってＩＶ型コラーゲンへテロ三量体及び六量体構築に重要であると同定されているＮＣ１ドメインの領域を標的とする成分を同定及び合成することを含む方法も提供する。本発明は、本発明の合理的薬物設計方法により、ここに開示されるＩＶ型コラーゲンＮＣ１六量体構造の解析に基づいて設計される新規ポリペプチドも提供する。
Patent JP-2004538167-A (JP)
IPC: B29C48/38
Filed: 2002-08-20
Abstract: A cutting mechanism for cutting fibers entrained within a viscous flow is herein disclosed. The present invention is typically part of a system for preparing fiber reinforced molding materials that comprises a viscous entrainment compounding device for compounding a continuous strand of reinforcing fiber with a molding material in a predetermined ratio. The entrained fibers are conveyed to the cutting mechanism which cuts the continuous strand of reinforcing fibers into predetermined lengths and conveys the fiber reinforced molding material to an output device. The cutting mechanism itself comprises a housing having a bore with an inlet and an outlet and a bed knife disposed therein. The bed knife has an inlet channel formed therethrough that is aligned with the gullets of a rotating cutter such that the gullets of the rotating cutter are rotated past the inlet channel of the bed knife in substantial alignment therewith. Fibers entrained within the molding material flow into the gullets of the rotating cutter and are cut to a predetermined length and then conveyed to an output device.
Patent JP-2005526265-A (JP)
Title: 自動焦点合わせ内視鏡システム
IPC: A61B1/00
Filed: 2002-08-20
Abstract: 環境のコントラスト特性に関わらず、しっかりとした焦点合わせ動作を行うことを可能にする内視鏡装置５及び方法。内視鏡装置５及び方法は、視野絞りエッジ１１にその焦点を合わせ、エッジに焦点が合った装置のデフォルト情報を格納することができる。その後、内視鏡５が通常の動作を行っている間に、体内の標的対象物に焦点を合わせることができない場合、内視鏡は、メモリ３２からデフォルト情報を呼び出し、レンズ１２の焦点を視野絞り１１のエッジに合わせる。従って、内視鏡装置５の前にある体内の構造対象物は、視覚化をするのに十分に焦点が合わせられる。
Patent JP-2005500397-A (JP)
IPC: A61K8/86
Filed: 2002-07-12
Abstract: The colorants for keratin fibers are based on oxidation dye precursors and/or direct dyes and contain a combination of (a) at least one nonionic, amphiphilic associative thickener, (b) at least one fatty alcohol that is liquid at 25° C. and (c) PEG-150/stearyl alcohol/SMDI copolymer in a suitable cosmetic carrier.
Patent JP-2005504497-A (JP)
Title: 電気機械に用いられる整流装置
IPC: H01R39/26
Filed: 2002-09-10
Abstract: 電気機械、特に自動車における直流モータに用いられる整流装置が挙げられる。この整流装置は、周方向で絶縁されて並列させられた多数の整流子片を備えた整流子と、この整流子にほぼ直径方向で配置された少なくとも２つのブラシ（１４）とを有している。各ブラシ（１４）は、互いに導電的に接続された固有の２つのブラシボディ（１５，１６）から成っている。両ブラシボディ（１５，１６）は、その整流子側の端部に、整流子片に力伝達式に載置する電気的なコンタクト面（２４，２５）を形成している。機械の回転方向逆転時の整流のごく僅かな移相を得るためには、各ブラシ（１４）の両ブラシホルダ（１５，１６）の両コンタクト面（２４，２５）の面重心（２６，２７）が、整流子の周方向で見て互いに相対的にずらされているように、各ブラシ（１４）の両ブラシホルダ（１５，１６）が配置されている。
Patent JP-2005523877-A (JP)
Title: 重病に関連する死亡率および罹患率の低減化方法
IPC: A61P11/08
Filed: 2002-09-19
Abstract: 本発明は、患者が一種の呼吸困難になりやすいか、またはそれを患う重病に関連する死亡率および罹患率を低減化するためのグルカゴン様ペプチド(GLP-1)化合物の使用に関する。
Patent JP-2005504162-A (JP)
Title: 補強用材料及び熱可塑性マトリックスとしての星形ポリアミドを含む複合材料、これらの材料の前駆体である複合物品並びにこれらの材料から得られる製品
IPC: D01F6/90
Filed: 2002-09-30
Abstract: 本発明は、ポリマーマトリックスと少なくとも１つの補強用ヤーン及び／又はファイバーを含む複合材料の前駆体物品であって、少なくとも１種の補強用ヤーン及び／又はファイバー並びに少なくとも１種のポリマーマトリックスヤーン及び／又はファイバーを含む前記前駆体物品に関する。本発明は、前記補強用ヤーン及び／又はファイバーが補強用材料から作られ且つ熱可塑性ポリアミド部分を含むことができ；前記ポリマーマトリックスヤーン及び／又はファイバーが熱可塑性ポリアミドから作られ；前記補強用ヤーン及び／若しくはファイバー並びに／又はポリマーマトリックスヤーン及び／又はファイバーの熱可塑性ポリアミドが星形構造を持つ少なくとも１種のポリアミドを含み；前記星形構造が、１つ以上のコアと該コアに結合した少なくとも３つのポリアミド枝分かれ又は少なくとも３つのポリアミドセグメントとを含む星形巨大分子鎖、及び適宜の線状ポリアミド巨大分子鎖を含有する：ことを特徴とする。
Patent JP-2005506027-A (JP)
IPC: H02P29/02
Filed: 2002-10-03
Abstract: A motor control circuit comprising a microcontroller 4 operable to provide a driving current to the windings 1 of a motor having an interrupt input 13 which when triggered ceases the driving current to the windings. A threshold circuit is provided to determine a reference level 10 which is compared to a signal indicative of the motor winding current 9 by comparator 8. If the winding current 9 exceeds the threshold value 10 the interrupt input 13 is triggered. The threshold value may be variable being controlled by software which adjusts the frequency or mark space ratio waveform, of output 16, in conjunction with a low pass filter 14 and 15. Alternatively the threshold value 10 may be fixed and determined by resistors 11 and 12.