iir_df1_generic.h File Reference

Generic C implementation of Direct Form I IIR filtering for various bit depths. More...

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Functions
static int16_t	iir_df1_s16 (struct iir_state_df1 *iir, int16_t x)
	Filter a 16-bit PCM sample using Direct Form 1 IIR filter.
static int32_t	iir_df1_s24 (struct iir_state_df1 *iir, int32_t x)
	Filter a 24-bit PCM sample using Direct Form 1 IIR filter.
static int16_t	iir_df1_s32_s16 (struct iir_state_df1 *iir, int32_t x)
	Filter a 32-bit PCM input sample producing a 16-bit output sample.
static int32_t	iir_df1_s32_s24 (struct iir_state_df1 *iir, int32_t x)
	Filter a 32-bit PCM input sample producing a 24-bit output sample.

Detailed Description

Generic C implementation of Direct Form I IIR filtering for various bit depths.

Function Documentation

iir_df1_s16()

static int16_t iir_df1_s16 ( struct iir_state_df1 *  iir, int16_t  x  )

inlinestatic

Filter a 16-bit PCM sample using Direct Form 1 IIR filter.

Parameters

iir	Pointer to DF1 filter state.
x	Input 16-bit sample (Q1.15).

Returns

Filtered 16-bit sample (Q1.15).

iir_df1_s24()

static int32_t iir_df1_s24 ( struct iir_state_df1 *  iir, int32_t  x  )

inlinestatic

Filter a 24-bit PCM sample using Direct Form 1 IIR filter.

Parameters

iir	Pointer to DF1 filter state.
x	Input 24-bit sample (Q1.23 in 32-bit container).

Returns

Filtered 24-bit sample (Q1.23).

iir_df1_s32_s16()

static int16_t iir_df1_s32_s16 ( struct iir_state_df1 *  iir, int32_t  x  )

inlinestatic

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

Parameters

iir	Pointer to DF1 filter state.
x	Input 32-bit sample (Q1.31).

Returns

Filtered 16-bit sample (Q1.15).

iir_df1_s32_s24()

static int32_t iir_df1_s32_s24 ( struct iir_state_df1 *  iir, int32_t  x  )

inlinestatic

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

Parameters

iir	Pointer to DF1 filter state.
x	Input 32-bit sample (Q1.31).

Returns

Filtered 24-bit sample (Q1.23).