Title:
HANDS FREE SPEAKING EQUIPMENT
Document Type and Number:
Japanese Patent JP3046203
Kind Code:
B2
Abstract:
PURPOSE: To enable simultaneous speaking among plural persons at mutually separated positions and to enable noise cancel by providing plural microphones, amplifier and differential amplifier circuit.
CONSTITUTION: This equipment 100 is composed of a hands free adapter 2, plural microphones 1a and 1b, and plural speakers. Then, two microphones 1a and 1b, which are separately constituted each other and arranged away, are connected to the hands free adapter 2 and the hands free adapter 2 is composed of a signal amplifier part 3a and a control part 4 for performing volume (sound volume) control. Thus, two microphones 2a and 2b are arranged separately each other, plural persons simultaneously enable speaking in a vehicle, and a noise component can be canceled while keeping a voice component with differential amplification while utilizing the separate arranging relation of those two microphones 1a and 1b.
Inventors:
Akiko Iwami
Application Number:
JP10405794A
Publication Date:
May 29, 2000
Filing Date:
May 18, 1994
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
H04M1/60; H04M9/08; H04R1/40; H04R3/00; H04M1/19; (IPC1-7): H04M1/60
Domestic Patent References:
| JP63299435A | ||||
| JP5330803A | ||||
| JP1114245A | ||||
| JP238850U |
Attorney, Agent or Firm:
Kenji Yoshida (2 outside)