Title:
RECEIVED SOUND VOLUME ADJUSTMENT DEVICE
Document Type and Number:
Japanese Patent JP2500467
Kind Code:
B2
Abstract:
PURPOSE: To attain the talking in a proper reception sound volume at all times by automatically adjusting the received sound volume in response to the contact state between a receiver and an ear.
CONSTITUTION: Lots of small sound holes 1a are formed to a part of a reception section 1 in contact with an ear. A speaker 2 is mounted to a rear side of the part where the sound holes 1a are made so as to opposite to the sound holes 1a. When the reception section 1 is not tightly in contact with the ear 60, a sound pressure in a front gas chamber 3 is reduced and it is sensed by a sound pressure sensor to adjust automatically the received sound volume to be increased. Since the received sound volume is automatically adjusted in response to the contact state between the reception section and the ear, in the case of a portable telephone set whose shape of the reception section is not easily brought into contact with the ear or in the case of the ear whose shape is not in close contact with the reception section, the voice of the opposite party is heard always by a proper reception sound volume.
Inventors:
SUZUKI MASATAKA
Application Number:
JP19911593A
Publication Date:
May 29, 1996
Filing Date:
July 16, 1993
Export Citation:
Assignee:
NIPPON ELECTRIC CO
International Classes:
H04M1/00; H04M1/03; (IPC1-7): H04M1/00; H04M1/03
Attorney, Agent or Firm:
Kihei Watanabe