JPS5639667A - Directional transmission-reception unit - Google Patents

Directional transmission-reception unit

Info

Publication number
JPS5639667A
JPS5639667A JP11558379A JP11558379A JPS5639667A JP S5639667 A JPS5639667 A JP S5639667A JP 11558379 A JP11558379 A JP 11558379A JP 11558379 A JP11558379 A JP 11558379A JP S5639667 A JPS5639667 A JP S5639667A
Authority
JP
Japan
Prior art keywords
microphone
speaker
group part
wavelength
reception unit
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
JP11558379A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0123024B2 (enrdf_load_stackoverflow
Inventor
Kiyoyasu Miyawaki
Tetsuo Ishizaka
Masamichi Ono
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP11558379A priority Critical patent/JPS5639667A/ja
Publication of JPS5639667A publication Critical patent/JPS5639667A/ja
Publication of JPH0123024B2 publication Critical patent/JPH0123024B2/ja
Granted 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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
JP11558379A 1979-09-08 1979-09-08 Directional transmission-reception unit Granted JPS5639667A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11558379A JPS5639667A (en) 1979-09-08 1979-09-08 Directional transmission-reception unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11558379A JPS5639667A (en) 1979-09-08 1979-09-08 Directional transmission-reception unit

Publications (2)

Publication Number Publication Date
JPS5639667A true JPS5639667A (en) 1981-04-15
JPH0123024B2 JPH0123024B2 (enrdf_load_stackoverflow) 1989-04-28

Family

ID=14666173

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11558379A Granted JPS5639667A (en) 1979-09-08 1979-09-08 Directional transmission-reception unit

Country Status (1)

Country Link
JP (1) JPS5639667A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6041360A (ja) * 1984-02-10 1985-03-05 Fujitsu Ltd 拡声会議電話装置
JPS63309615A (ja) * 1987-06-10 1988-12-16 Kuraray Co Ltd 高温における形態安定性に優れた耐熱性有機合成繊維
WO2007072757A1 (ja) * 2005-12-19 2007-06-28 Yamaha Corporation 放収音装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5631800U (enrdf_load_stackoverflow) * 1979-08-20 1981-03-27

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5631800U (enrdf_load_stackoverflow) * 1979-08-20 1981-03-27

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6041360A (ja) * 1984-02-10 1985-03-05 Fujitsu Ltd 拡声会議電話装置
JPS63309615A (ja) * 1987-06-10 1988-12-16 Kuraray Co Ltd 高温における形態安定性に優れた耐熱性有機合成繊維
WO2007072757A1 (ja) * 2005-12-19 2007-06-28 Yamaha Corporation 放収音装置
US8243951B2 (en) 2005-12-19 2012-08-14 Yamaha Corporation Sound emission and collection device
US9049504B2 (en) 2005-12-19 2015-06-02 Yamaha Corporation Sound emission and collection device

Also Published As

Publication number Publication date
JPH0123024B2 (enrdf_load_stackoverflow) 1989-04-28

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