iir_df1.h File Reference

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Data Structures
struct	iir_state_df1

Macros
#define	IIR_DF1_NUM_STATE   4
#define	SOF_IIR_DF1_4TH_NUM_BIQUADS   2

Functions
int	iir_init_coef_df1 (struct iir_state_df1 *iir, struct sof_eq_iir_header *config)
int	iir_delay_size_df1 (struct sof_eq_iir_header *config)
void	iir_init_delay_df1 (struct iir_state_df1 *iir, int32_t **state)
void	iir_reset_df1 (struct iir_state_df1 *iir)
int32_t	iir_df1 (struct iir_state_df1 *iir, int32_t x)
	Calculate IIR filter consisting of biquads.
int32_t	iir_df1_4th (struct iir_state_df1 *iir, int32_t x)
	Calculate IIR filter consisting of biquads, special simplified version for 4th order filter with two biquads in series.

Macro Definition Documentation

IIR_DF1_NUM_STATE

#define IIR_DF1_NUM_STATE   4

SOF_IIR_DF1_4TH_NUM_BIQUADS

#define SOF_IIR_DF1_4TH_NUM_BIQUADS   2

Function Documentation

iir_delay_size_df1()

int iir_delay_size_df1

(

struct sof_eq_iir_header *

config

)

iir_df1()

int32_t iir_df1	(	struct iir_state_df1 *	iir,
		int32_t	x )

Calculate IIR filter consisting of biquads.

Parameters

iir	IIR state with configured biquad coefficients and delay lines data
x	Single s32 Q1.31 format input sample

Returns

Single s32 Q1.31 format output samples

iir_df1_4th()

int32_t iir_df1_4th	(	struct iir_state_df1 *	iir,
		int32_t	x )

Calculate IIR filter consisting of biquads, special simplified version for 4th order filter with two biquads in series.

Note: There are no checks for iir struct members.

Parameters

iir	IIR state with configured biquad coefficients and delay lines data
x	Single s32 Q1.31 format input sample

Returns

Single s32 Q1.31 format output samples

iir_init_coef_df1()

int iir_init_coef_df1	(	struct iir_state_df1 *	iir,
		struct sof_eq_iir_header *	config )

iir_init_delay_df1()

void iir_init_delay_df1	(	struct iir_state_df1 *	iir,
		int32_t **	state )

iir_reset_df1()

void iir_reset_df1

(

struct iir_state_df1 *

iir

)