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41. 发明专利

JPH05323017A CRUISING NOISE REDUCTION SYSTEM 失效
公开(公告)号：JPH05323017A
公开(公告)日：1993-12-07
申请号：JP13293292
申请日：1992-05-26
申请人： NEC CORP
发明人： SUZUKI MICHIYA
IPC分类号： G01S7/527 , G01S3/86 , G01S7/536 , G01S7/66
摘要： PURPOSE:To prevent deterioration in noise reduction performance according to an ANC processing. CONSTITUTION:A transmission signal which is reflected at the sea bed is converted into an electrical signal by a first wave transmission/reception element 4 and a second wave transmission/reception element 5 and is output to a first delay machine 9 and a signal detector 11. The signal detector 11 outputs a trigger when it detects the arrival of echoes and a phase difference detector 10 detects an electrical phase difference phiE of the first and second wave transmission/reception elements 4 and 5. A second phase adjuster 13 forms a beam 16 for reference signal where an arrival direction theta of echoes is null according to the outputs of the first and second wave transmission/reception elements 4 and 5. An ANC processor 14 performs ANC processing according to a primary signal through the first delay machine 9 and a reference signal which is output from the second phase adjuster 13 and then reduces and outputs cruising noise which is included in the primary signal.

42. 实用新型

JPH0566579U 失效
公开(公告)号：JPH0566579U
公开(公告)日：1993-09-03
申请号：JP762692
申请日：1992-02-21
IPC分类号： G01S7/52 , G01S7/527 , G01S7/536 , H02G9/02 , H04R1/44 , G01S7/66

43. 发明专利

JPH05223925A APPARATUS AND METHOD FOR SUPPRESSING REFLECTION IN ULTRASONIC CONVERTER 失效
公开(公告)号：JPH05223925A
公开(公告)日：1993-09-03
申请号：JP30425592
申请日：1992-11-16
申请人： SIEMENS AG
发明人： DEIITORITSUHI HASURAA
IPC分类号： G01S7/526 , G01S7/52 , G01S7/527 , G01S7/536
摘要： PURPOSE: To suppress the reflection of acoustic receive signals in an ultrasonic converter. CONSTITUTION: An ultrasonic converter 2 is connected to a compensating circuit 10, and the compensating circuit 10 introduces a compensating transmission signal I with polarity similar to and opposite to an acoustic receive signal pe2 to the ultrasonic converter 2 while receiving. Furthermore, an adding element 14 is provided in a receive channel 4 also connected to the ultrasonic converter 2, a compensated receive signal is introduced to the first input side 16 of the adding element. The second input side 18 of the adding element is connected to the compensating circuit 10. In this case, a signal removing the component based on the compensating receive signal I from among a compensated receive signal E 2 is introduced to the second input side 18, so the output side 22 of the adding element 14 sends out a receive signal E from which the compensating signal I has been removed.

44. 发明专利

JPH05142335A SONAR DEVICE 失效
公开(公告)号：JPH05142335A
公开(公告)日：1993-06-08
申请号：JP32706191
申请日：1991-11-15
申请人： NEC CORP
发明人： KURODA KEIICHI
IPC分类号： G01S7/527 , G01S7/536
摘要： PURPOSE:To reduce receiving noise in low frequency band. CONSTITUTION:Receiver 1 is arranged under the bottom of a ship on the side of the stern. Receiver 1 receives only various kinds of noises generated from the ship itself. A control circuit 2 forms noise-rejection signal which is on the same level as that of self-noise received with a transmitter-receiver 3 and besides inverted in phase, by using the signal received with the receiver 1. By adding the output from the control circuit 2 and the output from the transmitter- receiver 3 with an adding circuit 4, a receiver circuit 5 receives the target signal without self-noise, that is, signal with well reduced noise in a low frequency band and with improved SN ratio.

45. 发明专利

JPH05126939A RING-LIKE ECHO REMOVING DEVICE FOR SONAR 失效
公开(公告)号：JPH05126939A
公开(公告)日：1993-05-25
申请号：JP31163491
申请日：1991-10-30
申请人： NEC CORP , NIPPON ELECTRIC ENG
发明人： YOSHIMITSU TAKESHI , FUTAKI KATSUAKI
IPC分类号： G01S7/527 , G01S7/529 , G01S7/536
摘要： PURPOSE:To obtain a ring-like echo removing device for sonars which can effectively prevent the generation of ring-like echoes even when each received data of multiple channels are high in sensitivity. CONSTITUTION:This ring-like echo removing device is provided with a maximum value detection circuit 8 which detects the maximum value and channel position of the maximum value from received data of multiple channels and reference level judgment circuit 9 which judges the level of the output of the circuit 8 by comparing the output with a reference level. In addition, attenuators 11 which attenuate the received data of channels other than the channel of the maximum value when the circuit 9 judges that the level of the output of the circuit 8 is higher than the reference level are also provided in the output stage of each channel.

46. 发明专利

JPH0593772A DETECTING DEVICE FOR UNDERWATER ACOUSTIC SIGNAL 失效
公开(公告)号：JPH0593772A
公开(公告)日：1993-04-16
申请号：JP27844591
申请日：1991-09-30
申请人： NEC CORP
发明人： YAMAMOTO MIGAKU
IPC分类号： G01S3/802 , G01S3/86 , G01S7/527 , G01S7/536
摘要： PURPOSE:To obtain an underwater acoustic signal detecting device which can suppress a harmful influence according to a frequency component of other signals effectively. CONSTITUTION:A title item is provided with a storage means 1 which stores an azimuth information for each frequency component which is obtained at each certain time, a variance calculation circuit 2 as an azimuth variance value calculation means which calculates a variance value of an azimuth for each frequency component from an azimuth information of a past certain period, and a criterion circuit 3 as a signal criterion means which determines presence or absence of a signal with the azimuth variance value which is calculated by the variance calculation circuit 2 as a reference.

47. 发明专利

JPH05676B2 失效
公开(公告)号：JPH05676B2
公开(公告)日：1993-01-06
申请号：JP20207887
申请日：1987-08-13
申请人： MATSUSHITA ELECTRIC WORKS LTD
发明人： YAMANE TOSHIKI , INOE HIRONOBU , KATAYAMA SUSUMU , AZUMA NAOYA , TAKAGI TOSHIMASA
IPC分类号： G01S7/527 , G01S7/536

48. 发明专利

JPH04355392A APPARATUS FOR ANALYZING SIGNAL OF ACTIVE SONOBOUY 失效
公开(公告)号：JPH04355392A
公开(公告)日：1992-12-09
申请号：JP15515691
申请日：1991-05-31
申请人： NEC CORP
发明人： HARADA NAOHISA
IPC分类号： G01B17/00 , G01S7/527 , G01S7/536 , G01S7/62 , G01S15/50
摘要： PURPOSE:To prevent the display of unnecessary data of active reflected sound. CONSTITUTION:A display-bearing-range setting part 4 outputs selected-bearing- range data 103 indicating the bearing range other than a preset bearing range among bearing data 102, which are the outputs of an active-signal analyzing part 1, based on cursor-position data 107 and bearing-range data 108. In a bearing-data selecting part 3, selected bearing data 106 within the range of the selected-bearing-range data 103 among the bearing data are extracted, and selected cell-number data 104 indicating the cell number of the selected-bearing data 106 are outputted. A doppler-frequency-data selecting part 2 extracts selected doppler frequency data 105 corresponding to the selected cell number data 104 among doppler frequency data 101 outputted from the active-signal analyzing part 1. A display part 5 displays only the selected doppler frequency data 105 and the selected bearing data 106 in the forms corresponding to the distance data.

49. 实用新型

JPH04122380U 失效
公开(公告)号：JPH04122380U
公开(公告)日：1992-11-02
申请号：JP722292
申请日：1992-02-20
IPC分类号： G01D3/028 , G01S7/52 , G01S7/527 , G01S7/529 , G01S7/536 , G04F10/04 , G01S7/66 , G01D3/04

50. 发明专利

JPH04248488A VIDEO SIGNAL PROCESSING CIRCUIT 失效
公开(公告)号：JPH04248488A
公开(公告)日：1992-09-03
申请号：JP1317891
申请日：1991-02-04
申请人： NEC CORP , NIPPON ELECTRIC ENG
发明人： YAMAGUCHI TAKASHI , ITO NOBUHIRO , KANBARA FUMIHIRO
IPC分类号： G01S7/62 , G01S7/527 , G01S7/536 , G01S15/00
摘要： PURPOSE:To enable a video signal which highlights a discrimination between a background noise and an echo component to be displayed. CONSTITUTION:A data which is obtained by a sensor 2 of a sonar device and is digitized by a reception signal processing circuit 3 is stored at a data memory 4 of an N channel for each specified orientation interval, a stored data is read out for each specified distance interval, and an interval average value of an interval which is set at the orientation interval and the distance interval is obtained by an interval average value calculator 7. On the other hand, a maximum value and an average value over the distance interval for each orientation of the orientation interval are obtained by a maximum value detector 5 and a distance interval average value calculator 6, respectively. The interval average value is compared with the distance interval average value by a comparator 8, thus obtaining a Judgment result. Based on this judgment result, when the distance interval average value is larger than the interval average value, the maximum value is output from a selector 9 and is displayed on a display 10. On the other hand, when the interval average value is larger than the distance interval average value, the distance interval average value is outputted from the selector 9 and is displayed on the display 10.

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