JPS53138697A - Megaphone - Google Patents

Megaphone

Info

Publication number
JPS53138697A
JPS53138697A JP5414177A JP5414177A JPS53138697A JP S53138697 A JPS53138697 A JP S53138697A JP 5414177 A JP5414177 A JP 5414177A JP 5414177 A JP5414177 A JP 5414177A JP S53138697 A JPS53138697 A JP S53138697A
Authority
JP
Japan
Prior art keywords
megaphone
subtract
enhance
providing
sound pressure
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
JP5414177A
Other languages
Japanese (ja)
Inventor
Juhei Takahashi
Hiroyuki Baba
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP5414177A priority Critical patent/JPS53138697A/en
Publication of JPS53138697A publication Critical patent/JPS53138697A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To subtract the effect of reflection waves by the human head, improve overall output sound pressure in the end and enhance howling margin by providing two non-directional microphones and using the output differences thereof.
COPYRIGHT: (C)1978,JPO&Japio
JP5414177A 1977-05-10 1977-05-10 Megaphone Pending JPS53138697A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5414177A JPS53138697A (en) 1977-05-10 1977-05-10 Megaphone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5414177A JPS53138697A (en) 1977-05-10 1977-05-10 Megaphone

Publications (1)

Publication Number Publication Date
JPS53138697A true JPS53138697A (en) 1978-12-04

Family

ID=12962275

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5414177A Pending JPS53138697A (en) 1977-05-10 1977-05-10 Megaphone

Country Status (1)

Country Link
JP (1) JPS53138697A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5137806B2 (en) * 1972-11-15 1976-10-18

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5137806B2 (en) * 1972-11-15 1976-10-18

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