Title:
ノイズキャンセル用のフィルタ回路、ノイズ低減信号生成方法、およびノイズキャンセリングシステム
Document Type and Number:
Japanese Patent JP5564743
Kind Code:
B2
Abstract:
There is provided a filter circuit for producing a noise reduction signal for reducing a noise signal collected by a microphone, including: a digital section including an analog/digital conversion section configured to convert the noise signal into a digital noise signal, a digital filter section configured to produce a digital noise reduction signal based on the digital noise signal, and a digital/analog conversion section configured to convert the digital noise reduction signal into an analog noise reduction signal; an analog path connected in parallel to said digital section and configured to output the noise signal as it is or after processed by an analog filter; and a synthesis section configured to synthesize the analog noise reduction signal outputted from said digital/analog conversion section of said digital section and the analog signal outputted from said analog path to produce a noise reduction signal to be used for noise reduction.
Inventors:
Kohei Asada
Itabashi Tetsunori
Itabashi Tetsunori
Application Number:
JP2006306430A
Publication Date:
August 06, 2014
Filing Date:
November 13, 2006
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G10K11/178; H03H17/02; H03H17/04; H04R1/10; H04R3/00
Domestic Patent References:
| JP5333873A | ||||
| JP2034422A | ||||
| JP5313674A | ||||
| JP8307986A | ||||
| JP2006014307A | ||||
| JP2006033174A | ||||
| JP2003218651A | ||||
| JP8328587A |
Attorney, Agent or Firm:
Masanobu Iwata
Hiroto Nakagawa
Nobuo Suzuki
Atsuo Waki
Hiroto Nakagawa
Nobuo Suzuki
Atsuo Waki