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11. 发明专利

JPS53124953A FREQUENCY MONITORING UNIT 失效
公开(公告)号：JPS53124953A
公开(公告)日：1978-10-31
申请号：JP3946677
申请日：1977-04-08
申请人： HITACHI LTD
发明人： KATAYAMA TAKASHI
IPC分类号： H03B1/00
摘要： PURPOSE:To establish a frequency monitoring unit alarming with inadequate frequency, by judging the normality of frequency, through processing monitored frequency waveform after being digitalized.

12. 发明专利

JPH0290069A AUTOMATIC SPECTRUM DETECTING AND WARNING APPARATUS 失效
公开(公告)号：JPH0290069A
公开(公告)日：1990-03-29
申请号：JP24108488
申请日：1988-09-28
申请人： HITACHI LTD
发明人： KATAYAMA TAKASHI
IPC分类号： G01R23/16
摘要： PURPOSE:To make it possible to detect spectrums automatically without using vision based on the result of frequency analysis of a time series signal (undersea acoustic signal and the like) by providing a smoothing part, a memory part, an adding part and a spectrum detecting part. CONSTITUTION:A time series signal undergoes analog/digital conversion. Thereafter, the signal is converted into the digital discrete line of the frequency spectrums in a high speed Fourier transformation part 1. A smoothing part 2 outputs the waveform of the signal into a memory part 3 by convolution operation or with a recursive digital filter and the like. The stored data are retrieved with a display part 4 and displayed on a CRT display device or a gram recorder. An adding part 5 retrieves only the data corresponding to a preset frequency band so as to add the data. A spectrum detecting part 6 judges whether the value is larger or smaller than a preset threshold value. A warning part 7 issues warning when the detecting part 6 detects the spectrum so as to call the attention of the operator of the apparatus.

13. 发明专利

JPS5183466A KURITSUPUKINOO JUSURUKASANKI 失效
公开(公告)号：JPS5183466A
公开(公告)日：1976-07-22
申请号：JP784575
申请日：1975-01-20
申请人： HITACHI LTD
发明人： AOKI HIDEO , KATAYAMA TAKASHI
IPC分类号： H03M1/66 , G06G7/12 , H03G11/00 , H03K4/02

14. 发明专利

JPH03211483A SONAR DISPLAY CONTROL SYSTEM 失效
公开(公告)号：JPH03211483A
公开(公告)日：1991-09-17
申请号：JP614290
申请日：1990-01-17
申请人： HITACHI LTD
发明人： KATAYAMA TAKASHI
IPC分类号： G09G1/14 , G01S7/62 , G09G1/16
摘要： PURPOSE:To reduce the load on an internal processor and to perform sonar display control which makes an easy-to-see magnified display by transferring a specific solar processing signal by DMA and writing it, and converting the signal for magnification in the direction of a lateral axis in the middle of the transfer. CONSTITUTION:The multivalued digital sonar processing signal (S) from a sonar signal processor 1 is received by a data receiving circuit 2 and written in a line memory 3 and a CPU 8 considers that the data transfer is finished every time one line is written and sends an indication for reading the memory 3 to a DMA circuit 6. Consequently, the signal S of one line is read out of the memory 3 and written in a frame buffer memory 10 at line corresponding positions in order, but the signals S is converted by a lateral-axis magnifying circuit 5 into (m) data. A display control circuit 9 divides the frequency of the dot clock from a CRT monitor 13 to generate a horizontal and a vertical synchronizing signal and the signal S is read out of a memory 10 in synchronism with them and supplied to the monitor 13 after D/A conversion, so that the signal is displayed on a B scope while magnified laterally.

15. 发明专利

JPS63293649A DISPLAY SYSTEM FOR WORKING STATE OF PROCESSOR 失效
公开(公告)号：JPS63293649A
公开(公告)日：1988-11-30
申请号：JP12814487
申请日：1987-05-27
申请人： HITACHI LTD
发明人： MIYATA MASAHIKO , KATAYAMA TAKASHI
IPC分类号： G06F11/32
摘要： PURPOSE:To realize the check for normalness of a processing sequence by recognizing whether a program which gives the ON/OFF control to the display put into the course of a sequence processing action is carried out periodically or not. CONSTITUTION:A processor 1 carries out a main program via a processing part 4. The reference is given to the state of a specific bit set at a register 3 during execution of the main program. The ON/OFF signal is delivered via an output buffer 5 in accordance with the result of said reference to the state of the specific bit. Thus a display device 6 is controlled. In this case, the specific bit set at the register 3 is inverted in each fixed cycle via a timer interruption processing part 2. This inverting cycle is larger than the executing cycle of the main program. For instance, the specific bit is never inverted when an abnormal loop occurs in the main program and this abnormal state can be displayed as it is.

16. 发明专利

JPS57143716A EQUALIZER 失效
公开(公告)号：JPS57143716A
公开(公告)日：1982-09-06
申请号：JP2847881
申请日：1981-03-02
申请人： HITACHI LTD
发明人： KATAYAMA TAKASHI
IPC分类号： H03H11/04 , G11B5/035
摘要： PURPOSE:To obtain an equalizer of 3dB per octave by a simple circuit, by deciding a cutoff frequency so that a frequency characteristic of an inclined part which has added outputs of a differentiating circuit and an integration circuit, whose cutoff frequencies have been shifted from each other. CONSTITUTION:A CR differentiating circuit and a CR integration circuit are constituted of resistance 1, 3 and a capacitor 2, and resistances 4, 5 and a capacitor 6, respectively, a cutoff frequency fC1 and fC2 which have been shifted from each other are added by an operational amplifier 7, and the values of fC1 and fC2 are adjusted so that a frequency characteristic of its inclined part becomes 3dB per octave. In this way, an equalizer of 3dB per octave is obtained by a simple circuit.

17. 发明专利

JPS56150370A MEASURING CIRCUIT FOR INCOMING DIRECTION OF ACOUSTIC SIGNAL 失效
公开(公告)号：JPS56150370A
公开(公告)日：1981-11-20
申请号：JP5295180
申请日：1980-04-23
申请人： HITACHI LTD
发明人： KATAYAMA TAKASHI
IPC分类号： G01S3/80 , G01S3/803 , G01S3/808
摘要： PURPOSE:To accurately obtain the incoming direction of the acoustic signals by using the electric signals in the east and west directions and the south and north directions obtained by disposing two 8-shaped directional microphones at a right angle. CONSTITUTION:If the outputs in the east and west directions and the south and north directions of 8-shaped directional microphones are obtained, the outputs of the case in which the 8-shaped directional patterns direct all directions can be calculated. Thereupon, if the NULL direction is obtained by rotating the rotor shaft of a resolver, the incoming directions of sound can be known. Hence, angles are beforehand graduated around the rotor shaft. The outputs of the microphones 1, 2 are inputted to the resolver 5 through resolver exciting circuits 3, 4. The output of the resolver 5 is amplified by an audio amplifier 6 to allow a speaker 7 to sound. The shaft of the resolver 5 is rotated so as to minimize this speaker sound. The incoming direction of the sound is measured from the angle scale of that time.

18. 发明专利

JPS5456339A PHASE SHIFTING DEVICE 失效
公开(公告)号：JPS5456339A
公开(公告)日：1979-05-07
申请号：JP12238377
申请日：1977-10-14
申请人： HITACHI LTD
发明人： KATAYAMA TAKASHI
IPC分类号： H03K5/04 , H03H11/16 , H03H11/20 , H03K5/15
摘要： PURPOSE:To give the prescribed phase shift amout free from the effect of the frequency change with no use of the element such a LCR or the like and only through the constitution of the waveform process circuit composed of the active elements. CONSTITUTION:Signal (a) given from sine wave oscillator 1 is waveform-shaped (2) to rectangular wave signal (b), converted (4) to saw-tooth wave signal (d), and also changed to rectangular wave signal (c) through phase inversion 3 to be then converted (5) to saw-tooth wave signal (e). Then waveform (d) and (e) are supplied to comparator 6 and 7 to be compared with the fixed reference voltage v, and only the part exceeding v is drawn out to obtain rectangular wave signal (f) and (g) at the output. At the same time, bistable multivibrator 8 is triggered to obtain rectangular wave signal output (h). Signal (h) features the phase shifted by phi compared with original signal (b), and this phase shift is equivalent to the time during which signal (d) and (e) reach v. In this connection, an optional phase shift phi is obtained in a range from 0 deg. to 180 deg. if the value of v is varied from zero through the maximum value of signal (d) and (e). Furthermore, phi receives no effect even though the frequency of the input signal may change.

19. 发明专利

JPH03239981A METHOD AND DEVICE FOR DETECTING POSITION OF OBJECT 失效
公开(公告)号：JPH03239981A
公开(公告)日：1991-10-25
申请号：JP3578790
申请日：1990-02-16
申请人： HITACHI LTD
发明人： SEKIGUCHI OSAMU , FUJITA HAJIME , KATAYAMA TAKASHI
IPC分类号： G01C21/12 , G01S13/04 , G01S13/90
摘要： PURPOSE:To execute the detection of high resolution by correcting received data of an array loaded on a moving body, based on the direction of the array derived by an azimuth detecting device and an accelerometer, and position data, and detecting an azimuth of an object by a synthetic aperture technique. CONSTITUTION:In a signal processor 4, received data by an array 2, and position data from a gyroscope 11 and an accelerometer 12 are inputted, and stored in a storage device 9. Subsequently, in a CPU 6, by using data of the device 9, the received data is corrected by the position data. Next, in a high speed Fourier-transformation part 7, by using the corrected correcting received data, an azimuth of an object is derived. That is, from the received data of the initial array 2 which starts to detect a position of the object, and data which corrects second received data at the time when the array 2 moves by a certain distance, on a production of the initial array 2 by data of the moving direction and inclination at that time, the position of the object is detected by a synthetic aperture technique as data received by array length L corresponding to length obtained by adding its moving amount once to prescribed length l of the array 2.

20. 发明专利

JPS5538710A PHASE LOCK LOOP CIRCUIT 失效
公开(公告)号：JPS5538710A
公开(公告)日：1980-03-18
申请号：JP11065278
申请日：1978-09-11
申请人： HITACHI LTD
发明人： KATAYAMA TAKASHI
IPC分类号： H03L7/00 , H03L7/08 , H03L7/081
摘要： PURPOSE:To secure extraction of the signal featuring the 90 deg. phase difference to the basic wave signal regardless of the phase difference between the two signals by eliminating the range for the phase control. CONSTITUTION:In case signal (a) is selected by change-over switch 4, signal (a) passes through phase control circuit 5 and wave form conversion circuit 6. Then output signal (g) is compared with signal (b) for the phase at phase comparator 7, and thus the error voltage is supplied to phase control circuit 5 to secure the control so that the phase of signal (a) may feature the 90 deg. phase difference to signal (b). The error voltage, i.e., the output voltage of integrator 8 is monitored by window comparator 9. And when the phase lock becomes impossible, change-over switch control circuit 10 switches switch 4 in sequence to select signals (c)-(e) and to secure the phase lock.

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