The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 2004
Filed:
May. 20, 1999
Masayuki Tsuji, Tokyo, JP;
Masahiro Tsujishita, Tokyo, JP;
Kenichi Taura, Tokyo, JP;
Masayuki Ishida, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An audio signal noise reduction system comprises a noise detecting circuit for detecting a noise from an audio signal and outputting a detection signal indicating a start time and an end time of a noise period of the noise, an LPF for extracting a low frequency component of the audio signal, an HPF for extracting intermediate and high frequency components of the audio signal, a polynomial interpolation circuit for polynomial-interpolating the noise period of the low frequency component being extracted, a mute circuit for muting an output level of the noise period of the intermediate and high frequency components being extracted, and a signal synthesizing circuit for synthesizing the low frequency component whose noise period is polynomial-interpolated and the intermediate and high frequency components the level of whose noise period is suppressed to thus output the audio signal.