Abstract:  Traditional active noise control (ANC) system applied to cancel out the whole energy in the sound field，but ignore that the useful signal is mixed with the noise. Consequently，a new preprocessed system based on noisy version of the instantaneous mixing model defined in independent component analysis (ICA) was proposed to solve this problem. Making use of the information of separation matrix and the kurtosis of separated signals， the novel system can solve both permutation and amplitude ambiguity problems，and provide pure reference signal for ANC system. Theoretical analysis and computer simulations show that，although the SNR of others signal become worse，the system is exactly effective in separating speech signal if speech signal was jammed slightly.