iir_df2t_generic.h File Reference

Generic C implementation of Direct Form II Transposed IIR filtering. More...

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Functions
static int16_t	iir_df2t_s16 (struct iir_state_df2t *iir, int16_t x)
	Filter a 16-bit PCM sample using Direct Form 2 Transposed IIR filter.
static int32_t	iir_df2t_s24 (struct iir_state_df2t *iir, int32_t x)
	Filter a 24-bit PCM sample using Direct Form 2 Transposed IIR filter.
static int16_t	iir_df2t_s32_s16 (struct iir_state_df2t *iir, int32_t x)
	Filter a 32-bit PCM input sample producing a 16-bit output sample using DF2T.
static int32_t	iir_df2t_s32_s24 (struct iir_state_df2t *iir, int32_t x)
	Filter a 32-bit PCM input sample producing a 24-bit output sample using DF2T.

Detailed Description

Generic C implementation of Direct Form II Transposed IIR filtering.

Function Documentation

iir_df2t_s16()

static int16_t iir_df2t_s16 ( struct iir_state_df2t *  iir, int16_t  x  )

inlinestatic

Filter a 16-bit PCM sample using Direct Form 2 Transposed IIR filter.

Parameters

iir	Pointer to DF2T filter state.
x	Input 16-bit sample (Q1.15).

Returns

Filtered 16-bit sample (Q1.15).

iir_df2t_s24()

static int32_t iir_df2t_s24 ( struct iir_state_df2t *  iir, int32_t  x  )

inlinestatic

Filter a 24-bit PCM sample using Direct Form 2 Transposed IIR filter.

Parameters

iir	Pointer to DF2T filter state.
x	Input 24-bit sample (Q1.23 in 32-bit container).

Returns

Filtered 24-bit sample (Q1.23).

iir_df2t_s32_s16()

static int16_t iir_df2t_s32_s16 ( struct iir_state_df2t *  iir, int32_t  x  )

inlinestatic

Filter a 32-bit PCM input sample producing a 16-bit output sample using DF2T.

Parameters

iir	Pointer to DF2T filter state.
x	Input 32-bit sample (Q1.31).

Returns

Filtered 16-bit sample (Q1.15).

iir_df2t_s32_s24()

static int32_t iir_df2t_s32_s24 ( struct iir_state_df2t *  iir, int32_t  x  )

inlinestatic

Filter a 32-bit PCM input sample producing a 24-bit output sample using DF2T.

Parameters

iir	Pointer to DF2T filter state.
x	Input 32-bit sample (Q1.31).

Returns

Filtered 24-bit sample (Q1.23).