Active noise reduction method for off-line modeling of secondary channel based on EMFNL filter
A secondary channel, offline modeling technology, used in musical instruments, instruments, sounding instruments, etc., can solve the problems of the system being difficult to respond quickly, difficult to deal with nonlinear secondary channel situations, and poor real-time performance.
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[0043] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0044] The present invention proposes an active noise reduction method based on EMFNL filter offline modeling secondary channel, based on second-order EMFNL filter offline nonlinear modeling secondary channel, while using EMFNL filter as a control filter for active noise reduction Control, the secondary channel modeled by this method is estimated to be a nonlinear model, which has stronger nonlinear processing capabilities than the linear secondary channel.
[0045]The secondary channel is the whole process from the digital signal processor (DSP, Digital Signal Processor) outputting the digital electrical signal to the conversion of the digital signal into an acoustic signal arriving at the superposition point. Such as figure 1 As shown, the conversion process is as follows: DSP outputs a digital control signal y(n), which is converted into an analog signal by a dig...
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