Title:
VOICE COMMUNICATION SYSTEM
Document Type and Number:
Japanese Patent JPS5330803
Kind Code:
A
Abstract:
PURPOSE: Two couples of microphones are arraged being acoustically symmetrized and the outputs of two couples of microphones are made cancel, thereby preventing a speaker from howling.
Inventors:
KAKIHARA HIDETO
URIYUU NOBUHIKO
URIYUU NOBUHIKO
Application Number:
JP10502276A
Publication Date:
March 23, 1978
Filing Date:
September 03, 1976
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
H04R27/00; H04M1/20; H04M1/60; H04M9/00; (IPC1-7): H04M3/56; H04R27/00
Previous Patent: JPS5330802
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