JPS52407A - Low noise underwater mike - Google Patents

Low noise underwater mike

Info

Publication number
JPS52407A
JPS52407A JP7571175A JP7571175A JPS52407A JP S52407 A JPS52407 A JP S52407A JP 7571175 A JP7571175 A JP 7571175A JP 7571175 A JP7571175 A JP 7571175A JP S52407 A JPS52407 A JP S52407A
Authority
JP
Japan
Prior art keywords
mike
low noise
underwater
noise underwater
depolarization
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.)
Pending
Application number
JP7571175A
Other languages
Japanese (ja)
Inventor
Masatada Fukushima
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP7571175A priority Critical patent/JPS52407A/en
Publication of JPS52407A publication Critical patent/JPS52407A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/02—Microphones

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

PURPOSE:To eliminate noises due to parallel movement of an underwater mike by forming hollow sections so that drags applied to two sets of piezoelectric elements disPosed in the same direction of depolarization become equal to each other.
JP7571175A 1975-06-23 1975-06-23 Low noise underwater mike Pending JPS52407A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7571175A JPS52407A (en) 1975-06-23 1975-06-23 Low noise underwater mike

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7571175A JPS52407A (en) 1975-06-23 1975-06-23 Low noise underwater mike

Publications (1)

Publication Number Publication Date
JPS52407A true JPS52407A (en) 1977-01-05

Family

ID=13584082

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7571175A Pending JPS52407A (en) 1975-06-23 1975-06-23 Low noise underwater mike

Country Status (1)

Country Link
JP (1) JPS52407A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5387809A (en) * 1977-01-10 1978-08-02 Ploeger Walter Jr Printing ribbon spool
JPS55123489A (en) * 1978-12-20 1980-09-22 Ibex Inking Syst Method of supplying ink to ribbon spool for printing and ribbon

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5387809A (en) * 1977-01-10 1978-08-02 Ploeger Walter Jr Printing ribbon spool
JPS575712B2 (en) * 1977-01-10 1982-02-01
JPS55123489A (en) * 1978-12-20 1980-09-22 Ibex Inking Syst Method of supplying ink to ribbon spool for printing and ribbon
JPS585793B2 (en) * 1978-12-20 1983-02-01 イベツクス インキング システムズ コ−ポレ−シヨン Printing ribbon spool

Similar Documents

Publication Publication Date Title
IT1055078B (en) NOISE ATTENUATION STRUCTURE
FR2333308A1 (en) UNDERWATER ACOUSTIC TRANSMISSIONS
NL7506585A (en) ACOUSTIC FILM-ON-FOAM LAMINATE.
NO142042C (en) Sound deadening.
NL7608716A (en) SOUND GENERATOR.
BE791906A (en) LEAF PANELS REPRESENTING IN PARTICULAR HIGH ACOUSTIC QUALITIES
NL7504618A (en) REFLEKTOR WITH VIBRATIONS.
JPS52407A (en) Low noise underwater mike
IT1073749B (en) PARTICULAR BEAM FORMING ARRANGEMENT OPERATING IN COMBINATION WITH AN ALIGNMENT OF SONAR TRANSDUCERS
JPS52408A (en) Low noise underwater mike
JPS523424A (en) Non-combustible speaker vibration plate
JPS5239349A (en) Variable attenuator
NL7607463A (en) ACOUSTIC WAVES TRANSMITTER.
JPS5224446A (en) Distributed constant type delay line
JPS5222852A (en) Multiple mode piezo ceramic filter
JPS5221743A (en) Elastic surface-wave unit and its production method
JPS52139402A (en) Reverberation adding system
JPS5238213A (en) Stereo microphone
JPS5215287A (en) Flexible piezo-electric bimorph
JPS5334514A (en) Horn speaker
JPS51116378A (en) A vibration proof method by combining rubbers different in hardness
NO143547C (en) SUN SOUND WITH AT LEAST TWO MIDDLE STORES.
JPS51145066A (en) Method of arrest of noises in press
JPS53133017A (en) Headphone device
JPS51114921A (en) Acoustic converter