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:
Oct. 11, 2011
Filed:
Mar. 22, 2006
Hideki Ohashi, Gunma, JP;
Kozo Okuda, Osaka, JP;
Takeo Inoue, Osaka, JP;
Semiconductor Components Industries, LLC, Phoenix, AZ (US);
Abstract
An echo prevention circuit comprises a first and second FIR filters into which a first input signal is input through an input terminal; an input/output terminal to which an output signal of the first FIR filter is output and the output signal reflected is input or a second input signal is input; a first subtracter that subtracts an output signal of the second FIR filter from a combined signal of the output signal of the first FIR filter and the second input signal; an adaptive digital filter into which the output signal of the first FIR filter is input; a second subtracter that subtracts the output of the adaptive digital filter from the output of the first subtracter. The adaptive digital filter has such filter coefficients that based on the output of the second subtracter, the output signal from the output terminal is the output from the first subtracter that has had the other than the second input signal removed.