Study of Linear Impulse Response Measurement Using Maximum Length Sequences in Strong Nonlinearity

Maximum length sequences (MLS) have been studied extensively and have been found applications in home acoustic measurement. The effects due to strong nonlinearity on MLS measurement are studied. Because information of linear impulse response cannot be obtained by classical MLS method for an even order nonlinear interference, an improved method has been presented. We proposed an idea of using MLS with binary values 0 and 1 to stimulate a nonlinear model system and acquired a fast improvement algorithm based on FMT of MLS with elements of 1 and -1 levels for measuring the linear impulse response. Simulation experiments presented in the paper demonstrate the validity and the feasibility of our approach.