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:
Mar. 15, 2005
Filed:
May. 20, 2002
Shinya Takahashi, Tokyo, JP;
Bunkei Matsuoka, Tokyo, JP;
Ikuo Kajiyama, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An echo canceller has a high-pass filtera speakeran A/D converterand an echo canceller. The high-pass filtersuppresses a low-frequency component in a received signal. The speakeroutputs an acoustic sound of a low-frequency suppressed received signal passed through the high-pass filterThe A/D converterconverts an acoustic echo from a microphoneinto a transmission signal of a digital form. The echo cancellergenerates a pseudo echo signal based on the low-frequency suppressed received signal passed through the high-pass filterand eliminates the acoustic echo to be inputted to the microphonefrom the speakerby subtracting the pseudo echo signal from the digital signal converted by the A/D converter