ns_state.h

// Copyright 2022 XMOS LIMITED.
// This Software is subject to the terms of the XMOS Public Licence: Version 1.
#ifndef NS_STATE_H
#define NS_STATE_H
 
#include <bfp_math.h>
 
#define NS_FRAME_ADVANCE           (240)
 
#define NS_PROC_FRAME_LENGTH (512)
 
#define NS_PROC_FRAME_BINS        ((NS_PROC_FRAME_LENGTH / 2) + 1)
 
#define NS_INT_EXP (-31)
 
#define NS_WINDOW_LENGTH (480)
 
typedef struct {
 
    //Dynamic MCRA filter coefficients
    bfp_s32_t S;
    bfp_s32_t S_min;
    bfp_s32_t S_tmp;
    bfp_s32_t p;
    bfp_s32_t alpha_d_tilde;
    bfp_s32_t lambda_hat;
 
    int32_t data_S [NS_PROC_FRAME_BINS];
    int32_t data_S_min [NS_PROC_FRAME_BINS];
    int32_t data_S_tmp [NS_PROC_FRAME_BINS];
    int32_t data_p [NS_PROC_FRAME_BINS];
    int32_t data_adt [NS_PROC_FRAME_BINS];
    int32_t data_lambda_hat [NS_PROC_FRAME_BINS];
 
    //Data needed for the frame packing and windowing
    bfp_s32_t prev_frame;
    bfp_s32_t overlap;
    bfp_s32_t wind;
    bfp_s32_t rev_wind;
 
    int32_t data_prev_frame [NS_PROC_FRAME_LENGTH - NS_FRAME_ADVANCE];
    int32_t data_ovelap [NS_FRAME_ADVANCE];
    int32_t data_rev_wind [NS_WINDOW_LENGTH / 2];
 
    //Static MCRA filter coefficients
    //If modifying any parameters, modify one_minus parameters as well!
    float_s32_t delta;
    float_s32_t alpha_d;
    float_s32_t alpha_s;
    float_s32_t alpha_p;
    float_s32_t one_minus_aplha_d;
    float_s32_t one_minus_alpha_s;
    float_s32_t one_minus_alpha_p;
 
    unsigned reset_period;
    unsigned reset_counter;
 
} ns_state_t;
 
#endif