JPS5631662A - Sound sensing unit in under water sound detector - Google Patents

Sound sensing unit in under water sound detector

Info

Publication number
JPS5631662A
JPS5631662A JP8224579A JP8224579A JPS5631662A JP S5631662 A JPS5631662 A JP S5631662A JP 8224579 A JP8224579 A JP 8224579A JP 8224579 A JP8224579 A JP 8224579A JP S5631662 A JPS5631662 A JP S5631662A
Authority
JP
Japan
Prior art keywords
frequency signal
frequency
signal
mixer
reflected
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
JP8224579A
Other languages
Japanese (ja)
Other versions
JPS5926911B2 (en
Inventor
Isao Yamamoto
Tokihiko Hamada
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 JP8224579A priority Critical patent/JPS5926911B2/en
Publication of JPS5631662A publication Critical patent/JPS5631662A/en
Publication of JPS5926911B2 publication Critical patent/JPS5926911B2/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

PURPOSE:To suppress the doppler shift, by mixing the signal frequency-dividing the reflected frequency signal from the object under water with the local oscillation frequency signal at the 1st mixer, mixing the signal through the 1st filter with the reflected frequency signal at the 2nd mixer, and picking up the audible frequency signal at the 2nd filter. CONSTITUTION:The reflected frequency signal reflected from the object in water enters from the input terminal Pi and shaped at the shape circuit into a rectangular wave and frequency-divided at the frequency divider 2 into 1/n. This frequency signal fi/n and the oscillation frequency signal fo of the local oscillator 4 are mixed at the mixer 3, to deliver the frequency signal of (fi/n+ or -fo) from the filter circuit 5. This frequency signal and the input frequency signal fi are mixed at the mixer 6, and the audible frequency signal of (fi/n+fo)-fi is picked up via the filter circuit and audible tone is delivered from the speaker 9 via the amplifier 8. By setting the center value fbo of the audible frequency fo as fbo=fo-fio(n-1)/n, where; fio is the center frequency of fi, the amount of doppler shift can be suppressed to (n-1)/n.
JP8224579A 1979-06-28 1979-06-28 Listening device in underwater detection equipment Expired JPS5926911B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8224579A JPS5926911B2 (en) 1979-06-28 1979-06-28 Listening device in underwater detection equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8224579A JPS5926911B2 (en) 1979-06-28 1979-06-28 Listening device in underwater detection equipment

Publications (2)

Publication Number Publication Date
JPS5631662A true JPS5631662A (en) 1981-03-31
JPS5926911B2 JPS5926911B2 (en) 1984-07-02

Family

ID=13769032

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8224579A Expired JPS5926911B2 (en) 1979-06-28 1979-06-28 Listening device in underwater detection equipment

Country Status (1)

Country Link
JP (1) JPS5926911B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5118514A (en) * 1975-02-04 1976-02-14 Hirozo Tanimura

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019070578A (en) 2017-10-10 2019-05-09 株式会社タムラ製作所 Current detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5118514A (en) * 1975-02-04 1976-02-14 Hirozo Tanimura
JPS5838861B2 (en) * 1975-02-04 1983-08-25 タニムラ ヒロゾウ Jiki Tape Couch

Also Published As

Publication number Publication date
JPS5926911B2 (en) 1984-07-02

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