JPS57125368A - Needless signal removing device of fish detector and similar device - Google Patents

Needless signal removing device of fish detector and similar device

Info

Publication number
JPS57125368A
JPS57125368A JP56012137A JP1213781A JPS57125368A JP S57125368 A JPS57125368 A JP S57125368A JP 56012137 A JP56012137 A JP 56012137A JP 1213781 A JP1213781 A JP 1213781A JP S57125368 A JPS57125368 A JP S57125368A
Authority
JP
Japan
Prior art keywords
signal
gate
integrated
needless
signals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP56012137A
Other languages
Japanese (ja)
Other versions
JPH0255754B2 (en
Inventor
Yasuo Kawabata
Genji Mori
Hiroyuki Hamato
Yoichi Umehara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Furuno Electric Co Ltd
Original Assignee
Furuno Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Furuno Electric Co Ltd filed Critical Furuno Electric Co Ltd
Priority to JP56012137A priority Critical patent/JPS57125368A/en
Publication of JPS57125368A publication Critical patent/JPS57125368A/en
Publication of JPH0255754B2 publication Critical patent/JPH0255754B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/523—Details of pulse systems
    • G01S7/526—Receivers
    • G01S7/527—Extracting wanted echo signals

Abstract

PURPOSE:To remove a needless signal such as a noise includes in a receiving amplifying signal by a method wherein a receiving amplifying signal is integrated in an integrated circuit having a relatively large time constant to perform the real-time signal extraction processing having an obtained integrated level as a threshold level. CONSTITUTION:The receiving amplification signal (including a cable transmitting signal S1, an interference signal S2, a fish signal S3, needless signal S4 and noise S5) a wherein the signal obtained from a transmitter-receiver 1 is amplified and detected 2, is guided to a gate 3 as well as transferred and put in the gate 7 and an integration circuit 5. Said signal a is integrated like a signal b through the integration circuit 5, the levels of the signals a and b are compared 6 to send a high level shaping pulse c only while the signals S1-S4 are existing. Only for the high level period of said pulse c the gate 7 is open to obtain the signal d. The signal d is compared 8 with the set voltagevo and the signal D4 under the levelvo is removed. Further in a corelation circuit 9 a periodical signal and a non- periodical signal are selected and the obtained corelation output signals E1 and E2 are sent to the gate 3 while the transmitting signal S1 and the fish signal S3 are guided to an indicator 4.
JP56012137A 1981-01-28 1981-01-28 Needless signal removing device of fish detector and similar device Granted JPS57125368A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56012137A JPS57125368A (en) 1981-01-28 1981-01-28 Needless signal removing device of fish detector and similar device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56012137A JPS57125368A (en) 1981-01-28 1981-01-28 Needless signal removing device of fish detector and similar device

Publications (2)

Publication Number Publication Date
JPS57125368A true JPS57125368A (en) 1982-08-04
JPH0255754B2 JPH0255754B2 (en) 1990-11-28

Family

ID=11797119

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56012137A Granted JPS57125368A (en) 1981-01-28 1981-01-28 Needless signal removing device of fish detector and similar device

Country Status (1)

Country Link
JP (1) JPS57125368A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4999291A (en) * 1973-01-26 1974-09-19
JPS5159291A (en) * 1974-11-20 1976-05-24 Furuno Kyotaka KANSHOHAJOKYO SOCHI

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4999291A (en) * 1973-01-26 1974-09-19
JPS5159291A (en) * 1974-11-20 1976-05-24 Furuno Kyotaka KANSHOHAJOKYO SOCHI

Also Published As

Publication number Publication date
JPH0255754B2 (en) 1990-11-28

Similar Documents

Publication Publication Date Title
JPS53120295A (en) Subject discrimination device
JPS5574467A (en) Method of eliminating noise from known frequency
DE3567298D1 (en) Differential pressure access detector
JPS57125368A (en) Needless signal removing device of fish detector and similar device
JPS53108736A (en) Amplifier circuit
JPS6437173A (en) Digital clipping device
DE69129622T2 (en) HYBRID-ANALOG-DIGITAL-SIGNAL PROCESSING
JPS51145256A (en) Signal detecting circuit
JPS5750145A (en) Detection circuit for stereo identifying signal
JPS522396A (en) Sea-surface-reflection-disturbance-eliminating method
JPS53127813A (en) Agent for increasing drug sensitivity of antibiotic-resistant bacteria
JPS5574457A (en) Concentration measuring device
JPS54151469A (en) Automatic reverberation removing circuit
JPS5441783A (en) Method and apparatus for detection of ultrasonic wave receiving signals
JPS5575342A (en) Signal detector circuit
JPS5422871A (en) Low frequency component detecting system
EP0092962A3 (en) Heartbeat rate indicator
JPS5520006A (en) Noise filter circuit
JPS5748663A (en) Average level removing system
JPS52115282A (en) Flaw detection system for metal materials
JPS53102773A (en) Ultrasonic type vehicle detector
JPS54155704A (en) Signal transmission system
JPS5569064A (en) Testing method for pulsating noise
JPS559245A (en) Detector for forward and backward movement of mobile body
JPS54145460A (en) Automatic adjustment system for filter characteristics