NS API Structure Definitions¶
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NS_FRAME_ADVANCE¶
Length of the frame of data on which the NS will operate.
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NS_PROC_FRAME_LENGTH¶
Time domain samples block length used internally.
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NS_PROC_FRAME_BINS¶
Number of bins of spectrum data computed when doing a DFT of a NS_PROC_FRAME_LENGTH length time domain vector. The NS_PROC_FRAME_BINS spectrum values represent the bins from DC to Nyquist.
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NS_INT_EXP¶
The exponent used internally to keep q1.31 format.
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NS_WINDOW_LENGTH¶
The length of the window applyed in time domain
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struct ns_state_t¶
- #include <ns_state.h>
NS state structure.
This structure holds the current state of the NS instance and members are updated each time that
ns_process_frame()
runs. Many of these members are exponentially-weighted moving averages (EWMA) which influence the behaviour of the NS filter. The user should not directly modify any of these members.Public Members
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int32_t data_S[NS_PROC_FRAME_BINS]¶
int32_t array to hold the data for S.
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int32_t data_S_min[NS_PROC_FRAME_BINS]¶
int32_t array to hold the data for S_min.
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int32_t data_S_tmp[NS_PROC_FRAME_BINS]¶
int32_t array to hold the data for S_tmp.
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int32_t data_p[NS_PROC_FRAME_BINS]¶
int32_t array to hold the data for p.
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int32_t data_adt[NS_PROC_FRAME_BINS]¶
int32_t array to hold the data for alpha_d_tilde.
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int32_t data_lambda_hat[NS_PROC_FRAME_BINS]¶
int32_t array to hold the data for lambda_hat.
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int32_t data_prev_frame[NS_PROC_FRAME_LENGTH - NS_FRAME_ADVANCE]¶
int32_t array to hold the data for prev_frame.
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int32_t data_ovelap[NS_FRAME_ADVANCE]¶
int32_t array to hold the data for overlap.
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int32_t data_rev_wind[NS_WINDOW_LENGTH / 2]¶
int32_t array to hold the data for rev_wind.
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float_s32_t delta¶
EWMA of the energy ratio to calculate p.
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float_s32_t alpha_d¶
EWMA of the smoothing parameter for alpha_d_tilde.
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float_s32_t alpha_s¶
EWMA of the smoothing parameter for S.
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float_s32_t alpha_p¶
EWMA of the smoohting parameter for p.
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float_s32_t one_minus_aplha_d¶
EWMA of the 1 - alpha_d parameter.
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float_s32_t one_minus_alpha_s¶
EWMA of the 1 - alpha_s parameter.
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float_s32_t one_minus_alpha_p¶
EWMA of the 1 - alpha_p parameter.
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unsigned reset_period¶
Filter reset period value for auto-reset.
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unsigned reset_counter¶
Filter reset counter.
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int32_t data_S[NS_PROC_FRAME_BINS]¶