JPS5551375A - Noise eliminating system - Google Patents

Noise eliminating system

Info

Publication number
JPS5551375A
JPS5551375A JP12411778A JP12411778A JPS5551375A JP S5551375 A JPS5551375 A JP S5551375A JP 12411778 A JP12411778 A JP 12411778A JP 12411778 A JP12411778 A JP 12411778A JP S5551375 A JPS5551375 A JP S5551375A
Authority
JP
Japan
Prior art keywords
synchronous
noise
receiver
transmitter
reception
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
JP12411778A
Other languages
Japanese (ja)
Other versions
JPS6045831B2 (en
Inventor
Sadao Abe
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.)
SUZUKI FISH FINDER
SUZUKI GIYOTAN KK
Original Assignee
SUZUKI FISH FINDER
SUZUKI GIYOTAN KK
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 SUZUKI FISH FINDER, SUZUKI GIYOTAN KK filed Critical SUZUKI FISH FINDER
Priority to JP12411778A priority Critical patent/JPS6045831B2/en
Publication of JPS5551375A publication Critical patent/JPS5551375A/en
Publication of JPS6045831B2 publication Critical patent/JPS6045831B2/en
Expired 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 eliminate the synchronous noise caused at other apparatus due to the reception signal by giving a comparison between the noise signal obtained only through reception and the reception signal obtained by radiating the sound wave and then detecting the synchronous noise which is common to both signals. CONSTITUTION:Synchronous signal generator 1 generates synchronous pulses t1 and t2 to display unit 17. No ultrasonic wave is radiated from wave transmitter/ receiver 5 at pulse t1, and the signals received at transmitter/receiver 5 feature the synchronous and nonsynchronous noise signals. These noise signals undergo the amplification and detection through reception circuit 6 to be memorized in memory circuit 12. Then pulse t2 received at transmission circuit 4 from generator is sent to transmitter/receiver 5, and transmitter/receiver 5 converts the high frequency signal into the ultrasonic wave to radiate it into the sea. And the reflected signal is sent to the comparator to be read out via the pulse supplied from clock pulse generator 13, and then compared with the memorized waveform in comparator 14. Thus the common synchronous noise is detected. In this way, the synchronous noise can be eliminated.
JP12411778A 1978-10-11 1978-10-11 Noise removal method Expired JPS6045831B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12411778A JPS6045831B2 (en) 1978-10-11 1978-10-11 Noise removal method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12411778A JPS6045831B2 (en) 1978-10-11 1978-10-11 Noise removal method

Publications (2)

Publication Number Publication Date
JPS5551375A true JPS5551375A (en) 1980-04-15
JPS6045831B2 JPS6045831B2 (en) 1985-10-12

Family

ID=14877337

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12411778A Expired JPS6045831B2 (en) 1978-10-11 1978-10-11 Noise removal method

Country Status (1)

Country Link
JP (1) JPS6045831B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004080866A1 (en) * 2003-03-12 2004-09-23 Pfu Limited Paper feeder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004080866A1 (en) * 2003-03-12 2004-09-23 Pfu Limited Paper feeder

Also Published As

Publication number Publication date
JPS6045831B2 (en) 1985-10-12

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