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Remembering NLMS block values.

Question asked by LsH on Jul 27, 2015
Latest reply on Apr 21, 2016 by DaveThib

I have a NLMS block in use in my project on a ADAU1761. This seems to work fine. The block learn about the reflections it should cancel. But after a reset this learned information (filter coefficients) is lost.

 

I saw a few screen shots on this form where the NLMS block contain a button that show the coefficients. But when I use the block this button is not available. Also in exported C code I can’t see a declaration for the coefficients. The space used for the coefficients is not so difficult to find:

#define MOD_NLMS1_ALG0_LMSALG1RMSTABLEBASE31_ADDR 55

#define MOD_NLMS1_ALG0_LMSALG1RMSTABLEBASE31_FIXPT 0x00020000

#define MOD_NLMS1_ALG0_LMSALG1RMSTABLEBASE31_VALUE SIGMASTUDIOTYPE_FIXPOINT_CONVERT(0.015625)

#define MOD_NLMS1_ALG0_LMSALG1RMSTABLEBASE31_TYPE SIGMASTUDIOTYPE_FIXPOINT

#define MOD_NLMS1_ALG0_LMSALG1CCZM0_ADDR 311

#define MOD_NLMS1_ALG0_LMSALG1CCZM0_FIXPT 0x00800000

#define MOD_NLMS1_ALG0_LMSALG1CCZM0_VALUE SIGMASTUDIOTYPE_FIXPOINT_CONVERT(1)

#define MOD_NLMS1_ALG0_LMSALG1CCZM0_TYPE SIGMASTUDIOTYPE_FIXPOINT

 

I like to memorize the learned information. That way, I’m able to restore the last known information after a reset, giving better results just from the start.

 

Could I simply copy all data, or are the some things I have to take care off?

 

Thanks, Lukas

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