System and method for operating fir filters in multi-channel audio systems

A system configured to process an audio signal comprising a pair of side specific audio channels, the system comprising:

• two side specific mixing units;
• two side specific finite impulse response (FIR) filters;
• and
• two morphing units, wherein:
• each side specific mixing unit is configured to receive the pair of side specific audio channels and to output a mixed output signal mixed based on the pair of side specific audio channels,
• each side specific FIR filter is configured to receive the mixed output signal of a side specific mixing unit of a corresponding side and to output a side specific filtered signal, and
• each morphing unit is configured to receive the side specific filtered signal from each of the two side specific FIR filters and to output a side specific morphed output signal,
• wherein each of the two morphing units is configured, during a replacement period during which filter coefficients of one of the two side specific FIR filters are replaced, to output, as the side specific morphed output signal, only the side specific filtered signal received from another filter of the two side specific FIR filters.