Title:
HEARING AID
Document Type and Number:
Japanese Patent JPH0622397
Kind Code:
A
Abstract:
PURPOSE: To prevent the generation of a howling by coping with the momently varying change of an acoustic coupling by a simple constitution at a low cost.
CONSTITUTION: Based on an electric signal PS from a microphone 1, the generation of the howling and the frequency are detected by a howling detecting part 7. The frequency of the electric signal is phase-shifted by a phase shifting part 3 according to the detected howling frequency, and the phase-shifted signal is added to the electric signal PS by a signal adding part 4. The added electric signal is converted into an acoustic signal by a receiver 6, and outputted.
Inventors:
NOHAYASHI HARUO
FURUSAWA KOICHI
FURUSAWA KOICHI
Application Number:
JP17415092A
Publication Date:
January 28, 1994
Filing Date:
July 01, 1992
Export Citation:
Assignee:
TERUMO CORP
International Classes:
H04R3/02; H04R25/00; (IPC1-7): H04R25/00; H04R3/02
Attorney, Agent or Firm:
Yasunori Otsuka (1 person outside)
Next Patent: ACOUSTIC CONTROLLER