APPARATUS AND METHOD FOR REMOVING STEREO ECHO SIGNAL USING PRE-PROCESSING ALGORITHM

摘要

PURPOSE: A stereo sound echo removing device is provided to be capable of minimizing correlation between received stereo sound signals and a calculation amount, by adopting a preprocessing algorithm. CONSTITUTION: An orthogonalization device(101) extracts two sound components(f1(x1,x2),f2(x1,x2), which are orthogonal each other, from received stereo sound signals(x2(k),x1(k)). Absolute value calculators(102,105) filter absolute values of the extracted sound components, respectively. A gain attenuator(103) attenuates an absolute value of the filtered sound component from the absolute value calculator(102), and a gain attenuator(106) attenuates an absolute value of the filtered sound component from the absolute value calculator(105). An adder(104) adds the received stereo sound signal(x2(k)) and an output signal of the attenuator(103), and an adder(107) adds the received stereo sound signal(x1(k)) and an output signal of the attenuator(106).