CMSIS-DSP: arm_lms_norm_instance_q31 Struct Reference

| CMSIS-DSP Version 1.4.7 CMSIS DSP Software Library

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arm_lms_norm_instance_q31 Struct Reference

Instance structure for the Q31 normalized LMS filter.

## Data Fields

uint16_t | numTaps
q31_t * | pState
q31_t * | pCoeffs
q31_t | mu
uint8_t | postShift
q31_t * | recipTable
q31_t | energy
q31_t | x0

## Field Documentation

q31_t arm_lms_norm_instance_q31::energy

saves previous frame energy.

Referenced by arm_lms_norm_init_q31(), and arm_lms_norm_q31().

q31_t arm_lms_norm_instance_q31::mu

step size that controls filter coefficient updates.

Referenced by arm_lms_norm_init_q31(), and arm_lms_norm_q31().

uint16_t arm_lms_norm_instance_q31::numTaps

number of coefficients in the filter.

Referenced by arm_lms_norm_init_q31(), and arm_lms_norm_q31().

q31_t* arm_lms_norm_instance_q31::pCoeffs

points to the coefficient array. The array is of length numTaps.

Referenced by arm_lms_norm_init_q31(), and arm_lms_norm_q31().

uint8_t arm_lms_norm_instance_q31::postShift

bit shift applied to coefficients.

Referenced by arm_lms_norm_init_q31(), and arm_lms_norm_q31().

q31_t* arm_lms_norm_instance_q31::pState

points to the state variable array. The array is of length numTaps+blockSize-1.

Referenced by arm_lms_norm_init_q31(), and arm_lms_norm_q31().

q31_t* arm_lms_norm_instance_q31::recipTable

points to the reciprocal initial value table.

Referenced by arm_lms_norm_init_q31(), and arm_lms_norm_q31().

q31_t arm_lms_norm_instance_q31::x0

saves previous input sample.

Referenced by arm_lms_norm_init_q31(), and arm_lms_norm_q31().