Title:
NOISE SOUND SUPPRESSION CIRCUIT
Document Type and Number:
Japanese Patent JP3308780
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To attain signal conversion such as an excellent voice signal by generating a signal to cancel noise, summing signals so as to cancel the noise thereby suppressing the noise in the converted output and reducing considerably intrusion of noise.
SOLUTION: Microphones 1, 2 pick up respectively a sound source and a surrounding noise. The signal from the microphone 1 is given to a noise canceller 6, an adder 5, and a voice detection circuit 11 via an amplifier. The signal from the microphone 2 is given to an adder, a noise canceller 7 and the voice detection circuit 11 as a signal to be a signal to cancel transmission noise. An output signal of the noise canceller 6 is added to a signal from an amplifier 10 by the adder 4. Outputs of the adders 4, 5 are given to a comparator 8 and a terminal 6 of a switch circuit 12. The switch circuit activates the switch circuit 12 depending on a signal level in the comparator 8. The switch circuit is connected to a signal with a lower noise level and outputted from a terminal C as a transmission signal.
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Inventors:
Yoshimasa Kamozu
Makoto Suzuki
Shigeaki Aoki
Kazumasa Mitsuhashi
Makoto Suzuki
Shigeaki Aoki
Kazumasa Mitsuhashi
Application Number:
JP26901095A
Publication Date:
July 29, 2002
Filing Date:
September 25, 1995
Export Citation:
Assignee:
Iwasaki Tsushinki Co., Ltd.
Nippon Telegraph and Telephone Corporation
Nippon Telegraph and Telephone Corporation
International Classes:
H04R1/40; H03H17/00; H03H21/00; H04B1/10; H04R3/00; (IPC1-7): H04R3/00; H03H17/00; H03H21/00; H04B1/10; H04R1/40
Domestic Patent References:
| JP5173582A |
Attorney, Agent or Firm:
Manabu Otsuka