Title:
NOISE REDUCING CIRCUIT, AND UNDERWATER SENSOR WITH SAME
Document Type and Number:
Japanese Patent JP3815735
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a noise reducing circuit for also reducing noise generated near a protecting member, and to provide an underwater sensor having the noise reducing circuit.
SOLUTION: A wave receiving element for receiving a sound wave from a target is protected by a dome 14. A vibration sensor 16 and an acoustic sensor 17 are mounted to the dome 14, and noise generated by the dome 14 itself or near the dome 14 is detected. The vibration sensor 16 and the acoustic sensor 17 output the detection result to a pseudo filter section 22 via a data conversion section 20. The pseudo filter section 22 generates a reference signal, based on the detection result. An adaptive processing section 24 estimates noise components in comparison with a main signal, based on the reference signal and a reception signal outputted from a signal reception section 10, eliminates the noise components, and extracts a target signal component.
Inventors:
Takaaki Takeru
Yasuhiko Nagata
Tatsuo Kikuchi
Yasuhiko Nagata
Tatsuo Kikuchi
Application Number:
JP2003110279A
Publication Date:
August 30, 2006
Filing Date:
April 15, 2003
Export Citation:
Assignee:
Director General, Technical Research Division, Defense Agency
JRC Tokuki Co., Ltd.
JRC Tokuki Co., Ltd.
International Classes:
G01S7/527; G01S7/526; G01S7/536; (IPC1-7): G01S7/527; G01S7/526; G01S7/536
Domestic Patent References:
| JP2000241534A | ||||
| JP5142335A | ||||
| JP7134061A | ||||
| JP57124267A | ||||
| JP2147978A | ||||
| JP61102571A | ||||
| JP3017583A |
Attorney, Agent or Firm:
Kenji Yoshida
Jun Ishida
Jun Ishida