INVERTER FOR MPEG-2 MULTICHANNEL AUDIO DECODING DEVICE

PROBLEM TO BE SOLVED: To input a lot of hybrid-decoded signals and to restore them to original signals through specified decoding conversion by performing dematrixing operation to the plural hybrid-decoded signals and filtering them through a low-pass filter(LPF). SOLUTION: In this dematrixing device for MPEG-2 multichannel audio decoder for 5.1 channel, an operation and control logic 20 sets five hybrid- decoded signals, namely, left side and right side signals L0 and R0 of stereo and three channel signals T2 -T4 for multichannel signal processing as inputs and performs the dematrixing operation for changing these signals into original signals, namely, left side and right side signals LW and RW of stereo, to which a weighted value is multiplied by an encoder, and respective center, left surround and right surround signals CW, LSW and RSW. Then, an IIR filter 30 sets an output signal xn from the operation and control logic 20 as an input and prepares a signal yn filtered through the LPF.