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1. 发明专利

JP2012018997A Sound absorbing structure of electronic device 审中-公开
标题翻译：电子设备的声音吸收结构
公开(公告)号：JP2012018997A
公开(公告)日：2012-01-26
申请号：JP2010154419
申请日：2010-07-07
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KIMURA HIROSHI , YOKOYAMA TOMOYOSHI , INAGAKI KATSUNORI
IPC分类号： H05K7/20 , G10K11/16
摘要： PROBLEM TO BE SOLVED: To provide a sound absorbing structure capable of improving sound absorbing effect while keeping an installation space small.SOLUTION: In a sound absorbing mechanism, a plurality of sound absorbing materials 4 in prescribed forms are arranged at predetermined intervals in a cooling fluid passage from a blower 3 mounted on an electronic device 2, thereby forming a plurality of penetrating holes 5. The plurality of sound absorbing materials 4 are so arranged that sound coming from the blower 3 and vertically entering penetrating surfaces of the penetrating holes 5 does not directly go out of the electronic device 2. By attaching vibration damping materials 6, 7 and 8 to each of the sound absorbing materials 4, vibration of the sound absorbing materials 4 is suppressed, and the sound is prevented from passing through the sound absorbing materials 4 and directly going out of the electronic device 2 in the horizontal direction.
摘要翻译：要解决的问题：提供一种能够在保持安装空间小的同时改善吸声效果的吸音结构。解决方案：在吸声机构中，在安装在电子设备2上的鼓风机3的冷却流体通道中，以规定间隔配置多个吸音材料4，形成多个贯通孔5 多个吸声材料4被布置成使得来自鼓风机3的声音和垂直进入穿透孔5的穿透表面的声音不会直接从电子设备2出来。通过将减振材料6,7和8连接到每个吸音材料4，吸音材料4的振动被抑制，并且防止声音通过吸声材料4并且在水平方向上直接从电子设备2出来。版权所有（C）2012，JPO＆INPIT

2. 发明专利

JPH11348601A AUTOMOBILE CONTROL DEVICE 失效
公开(公告)号：JPH11348601A
公开(公告)日：1999-12-21
申请号：JP15544399
申请日：1999-06-02
申请人： HITACHI LTD
发明人： MINOWA TOSHIMICHI , YOSHIDA YOSHIYUKI , KIMURA HIROSHI , OYAMA TAKASHIGE
IPC分类号： B60W10/00 , B60K31/00 , B60W10/02 , B60W10/04 , B60W10/06 , B60W10/10 , B60W10/18 , B60W10/184 , F02D29/02 , F02D45/00 , B60K41/28
摘要： PROBLEM TO BE SOLVED: To provide an automobile control device for controlling engine torque, transmission gear ratio, and brake pressure to eliminate a difference between target acceleration/deceleration and actual acceleration/deceleration by computing driver-intended target acceleration/deceleration. SOLUTION: This device is provided with a target acceleration/deceleration computing and comparing means 6 for computing target acceleration/deceleration by referring to accelerator operation opening and brake actuating force. Control is applied to the transmission gear ratio of an automatic transmission 10, the throttle opening of an engine 11, fuel supply quantity, or ignition timing, and an automobile brake device 12 so that a difference between the computed target acceleration/deceleration and actual acceleration/deceleration may be zero. The result can obtain driver-intended acceleration/deceleration, for enhancing drivability. In addition, frequent use of the neutral shift position enhances fuel economy.

3. 发明专利

JPH11330906A ANALOG FILTER CIRCUIT AND MAGNETIC DISK DRIVE USING SAME 失效
公开(公告)号：JPH11330906A
公开(公告)日：1999-11-30
申请号：JP13474598
申请日：1998-05-18
申请人： HITACHI LTD
发明人： KIMURA HIROSHI , NISHITANI TAKUJI , KATO TAKATOSHI , NARA TAKASHI , MITA SEIICHI
IPC分类号： G11B20/10 , H03H11/04 , H03H11/12
摘要： PROBLEM TO BE SOLVED: To provide the analog filter circuit which has linear relation between the size of setting data and a cutoff frequency by relaxing the restrictions of the production process type of a variable transconductance amplifier. SOLUTION: This circuit has an analog filter 10 which filters an externally inputted signal, a transconductance amplifier 21 which has the same characteristics with the transconductance amplifier 12 constituting the analog filter 10, circuits 26 to 28 which supply control currents of the same level to both the amplifiers 14 and 21, circuits 20 and 22 which generate signals of level proportional to the transconductance of the amplifier 21, circuits 11 and 23 which generate signals of levels corresponding to the value of setting data, and circuits 24 and 25 which control the levels of the said control currents so that the difference between both the generated signals approximate to 0.

4. 发明专利

JPH11312984A VITERBI DECODING METHOD, VITERBI DECODER, SIGNAL PROCESSING INTEGRATED CIRCUIT, DATA REPRODUCING DEVICE, MAGNETIC DISK DEVICE, AND INFORMATION PROCESSING SYSTEM 失效
公开(公告)号：JPH11312984A
公开(公告)日：1999-11-09
申请号：JP12016398
申请日：1998-04-30
申请人： HITACHI LTD
发明人： TSUKANO MASAKO , NISHITANI TAKUJI , KIMURA HIROSHI , HIRAI TATSUYA , NARA TAKASHI , MITA SEIICHI
IPC分类号： G11B20/18 , H03M13/23 , H03M13/12
摘要： PROBLEM TO BE SOLVED: To simplify ACS operation by omitting comparison operation for state transition where likelihood is apparently reduced and surviving path selection operation. SOLUTION: Comparison operation and surviving path selection operation are not performed for branches where the value of a branch metric B is apparently increased by an input (y) (likelihood is reduced) out of the branches entering each state S in a trellis diagram. For example, in the case of a state 0000 at a time (t), when the expected values of the two branches transited to a state 1000 at a time (t-1) are -2 and -3, and are yt-2 >=0, since they are considerably different from an inputted equalization value, the state 1000 apparently exists on an erroneous path. Consequently, the state transition from the state 0000 to the state 0000 is made as a surviving path because the transition from the state 1000 to the state 0000 is an erroneous path in the state transition from the time t-1 to the time (t). Thus, operation is simplified. Then, the number of comparators is reduced to reduce the circuit scale.

5. 发明专利

JPH11238320A SIGNAL PROCESSING METHOD AND RECORDING AND REPRODUCING DEVICE USING IT 失效
公开(公告)号：JPH11238320A
公开(公告)日：1999-08-31
申请号：JP4162298
申请日：1998-02-24
申请人： HITACHI LTD
发明人： NISHITANI TAKUJI , NARA TAKASHI , IDE HIROSHI , MITA SEIICHI , KIMURA HIROSHI , HIRAI TATSUYA , TSUKANO MASAKO
IPC分类号： G11B20/18 , H03M13/23 , H04B3/04 , H03M13/12
摘要： PROBLEM TO BE SOLVED: To provide a decoding method with a simple decoding circuit constitution and moreover, a low decoding error rate, and consequently, a recording and reproducing device with a low decoding error rate, by providing a means for correcting an increase in the decoding error by colored noise included in an equalized value after a Viterbi decoding. SOLUTION: When decoding data, a recording and reproducing device with a low decoding rate is achieved by executing Viterbi decoding by a Viterbi decoder 370, and then, obtaining an equalization error pattern according to a channel characteristic, in which an influence of the equalization error correlation is relaxed, from a calculation result of an expectation value calculating part 450, detecting decoding errors, and correcting them in a correcting part 470.

6. 发明专利

JPH11107806A ENGINE CONTROL METHOD 失效
公开(公告)号：JPH11107806A
公开(公告)日：1999-04-20
申请号：JP27686697
申请日：1997-10-09
申请人： HITACHI LTD
发明人： KURIHARA NOBUO , KIMURA HIROSHI , OSUGA MINORU , NOGI TOSHIJI , SHIRAISHI TAKUYA
IPC分类号： F01N3/20 , F02D41/02 , F02D41/04 , F02D41/34
摘要： PROBLEM TO BE SOLVED: To realize regenerative control without incurring a torque variation and an emission increase by installing the second fuel injection means to spray fuel at an engine expansion stroke so as to keep up oxygen content or air-fuel ratio in front of a catalyzer to the specified value. SOLUTION: An air-fuel ratio sensor 8 is installed in space between an exhaust valve 7 and a NOx catalyzer 2. This air-fuel ratio signal 105 is inputted into a controller 9 and it is used for a catalyzer regenerative control 202. A fuel injection quantity determined for regeneration by this catalyzer regenerative control 202 is added to a signal proportioned to torque by operation 203, and an injection signal 104 is outputted to an injector 5. In brief, the fuel injection quantity for this regenerative control 202 is made into a closed loop by means of output value of the air-fuel ratio sensor 8. Fuel for the regeneration control is spray at the latter period of an expansion stroke of a cylinder injection engine 1 so as not to exert any influence to the engine torque. Since this unbernt hydrocarbon is burned in the exhaust pipe, an exhaust temperature goes up. Thus, the NOx catalyzer 2 is regenerable owing to this reducing atmosphere and the rising of exhaust temperature.

7. 发明专利

JPH11103258A VITERBI DECODER 失效
公开(公告)号：JPH11103258A
公开(公告)日：1999-04-13
申请号：JP26372897
申请日：1997-09-29
申请人： HITACHI LTD
发明人： TSUKANO MASAKO , NISHITANI TAKUJI , KIMURA HIROSHI , NARA TAKASHI , MITA SEIICHI
IPC分类号： G06F11/10 , G11B20/18 , H03M13/23 , H03M13/12
摘要： PROBLEM TO BE SOLVED: To shorten the pass memory length of a viterbi decoder. SOLUTION: Each pass memory 105 formed in each state stores a decoded value sequence determined by a maximum likelihood(ML) pass up to a current state which is calculated by an addition/comparison selector 104 on condition that the current state is a corresponding state. The pass memory 105 outputs a frontmost decoded value in a decoded value sequence. An ML selector 126 selects and outputs an ML decoded value calculated by its corresponding selector 104 out of decoded values outputted from respective pass memories.

8. 发明专利

JPH09195823A AIR-FUEL RATIO CONTROL DEVICE OF ENGINE 失效
公开(公告)号：JPH09195823A
公开(公告)日：1997-07-29
申请号：JP302496
申请日：1996-01-11
申请人： HITACHI LTD
发明人： KIMURA HIROSHI , KURIHARA NOBUO
IPC分类号： F02D45/00 , F02D41/14
摘要： PROBLEM TO BE SOLVED: To reduce the HC in the exhaust gas, especially the HC at the starting time, by calculating the HC density in the exhaust gas, and the HC exhaust amount from a fuel injection amount or a suction air amount, and regulating the fuel injection amount or the suction air amount, according to the comparing result of the above HC exhaust amount with a specific value. SOLUTION: An O2 feedback control means 201 in an ECU carries out the O2 feedback, while a basic fuel injection amount operation means 202 operates the basic fuel injection amount from a flow-in air amount. And a rotation variation operation means 203 operates the variation of the engine rotation, and decides a fuel injection amount correcting amount to make the above rotation variation less than a specific value. Furthermore, the HC exhaust amount is operated from the signal of an HC sensor by an HC exhaust amount operation means 205, and the fuel injection amount and the correcting amount of the throttle opening are decided to make the HC exhaust amount less than a specific value by a fuel injection amount and throttle opening correcting value operation means 206.

9. 发明专利

JPH08218917A ENGINE CONTROL DEVICE 失效
公开(公告)号：JPH08218917A
公开(公告)日：1996-08-27
申请号：JP3039295
申请日：1995-02-20
申请人： HITACHI LTD , HITACHI CAR ENGINEERING KK
发明人： HORI TOSHIO , AKAGI YOSHIHIKO , KURIHARA NOBUO , KIMURA HIROSHI
IPC分类号： F02D45/00 , F02D41/04 , F02D41/14 , G01M15/11 , G05B11/36
摘要： PURPOSE: To detect a stability factor of combustion each time by regarding dispersion or deviation, in a plurality of prescribed periods of strength of a rotary primary component and a rotary secondary component, as the index of the stability factor of combustion. CONSTITUTION: Momentary rotating speed is measured 101 at an interval for detecting primary and secondary components of rotation. A D.C. component as a average rotating speed is cut 102, and a deviation obtained from the average rotating speed is used as calculation. The total of four strengths of real numbers and imaginary numbers in the frequency of rotation primary and secondary components as a trigonometric function, are supplied 103 following a phase when the rotating speed is measured. The referential strength and rotary fluctuation multiply together (104) so as to obtain the total of four momentary values of the real numbers and imaginary numbers of specified frequency components such as the primary and secondary components. Those momentary values are accumulated for one explosion, and thereby, the strengths of the real numbers and imaginary numbers of the primary and secondary components for one explosion are found out (105, 106). When dispersion or a deviation are found out from the data, dispersion of combustion can be found out (107).

10. 发明专利

JPH07192406A DEVICE FOR GENERATING TIMING CLOCK AND MAGNETIC DISK DEVICE LOADING THE SAME, AND SEMICONDUCTOR INTEGRATED CIRCUIT INCORPORATING THE SAME 失效
公开(公告)号：JPH07192406A
公开(公告)日：1995-07-28
申请号：JP33299293
申请日：1993-12-27
申请人： HITACHI LTD
发明人： HOTTA RYUTARO , HASE KENICHI , WATANABE KUNIO , KIMURA HIROSHI , TANNO KOICHI , NARA TAKASHI , SHIRAISHI KAZUHISA
IPC分类号： G11B20/14 , H03L7/085 , H04L7/033
摘要： PURPOSE:To reduce the processing time, to enhance the PLL band and to increase the magnetic disk capacity by using a timing error detector for digital operation and also for analog operation, detecting a timing error amount and converting it into an analog amount and outputting it. CONSTITUTION:In a signal reproducing system block, a PLL 19 is constituted of the timing error detector, a loop filter and a VCO. A timing clock 34 being an output of a filter 16 is fetched by an analog/digital converter 17, and the digital signal data 37 are generated. The digital equalized signal data 33 are outputted to a comparator, and whether or not the value is larger than zero, is judged. The comparison result and the signal data 33 are inputted to a one clock delay circuit, and the delay comparison data are generated. An integrator generates an integration result. A DAC performs the operation making flow current or pulling out current through/from the loop filter according to positive/ negative value of an input.

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