Title:
VEHICLE-MOUNTED HANDSFREE SYSTEM
Document Type and Number:
Japanese Patent JP2005247181
Kind Code:
A
Abstract:
To enable echo canceling processing during hands-free communication at an automobile phone and a mobile phone and the like to be positively carried out by a simple configuration.
This vehicle-mounted handsfree system has a first microphone 12, a second microphone 13, amplifier circuits 14, 15 for amplifying output levels of these first and second microphones 12, 13 and a differential amplifying circuit 16 for synthesizing output signals outputted from the amplifier circuits 14, 15. A speaker 11 is arranged at a position equally spaced apart in distance from each of the first microphone 12 and the second microphone 13 so as to eliminate travel noise and an echo signal.
Inventors:
NISHIMURA DAISUKE
KONNO FUMIYASU
KONNO FUMIYASU
Application Number:
JP2004061968A
Publication Date:
September 15, 2005
Filing Date:
March 05, 2004
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
B60R11/02; H04B7/26; H04M1/60; H04R3/00; H04R3/02; H04W4/04; (IPC1-7): B60R11/02; H04B7/26; H04M1/60; H04Q7/38; H04R3/00; H04R3/02
Attorney, Agent or Firm:
Fumio Iwahashi
Tomoyasu Sakaguchi
Hiroki Naito
Tomoyasu Sakaguchi
Hiroki Naito