mlib_SignalEmphasize_F32_F32 (3MLIB)

Name

mlib_SignalEmphasize_S16_S16_Sat, mlib_SignalEmphasize_S16S_S16S_Sat, mlib_SignalEmphasize_F32_F32, mlib_SignalEmphasize_F32S_F32S - signal pre-emphasizing

Synopsis

cc [ flag... ] file... –lmlib [ library... ]
#include <mlib.h>

mlib_status mlib_SignalEmphasize_S16_S16_Sat(mlib_s16 *dst, 
     const mlib_s16 *src, void *filter, mlib_s32 n);

mlib_status mlib_SignalEmphasize_S16S_S16S_Sat(mlib_s16 *dst, 
     const mlib_s16 *src, void *filter, mlib_s32 n);

mlib_status mlib_SignalEmphasize_F32_F32(mlib_f32 *dst, 
     const mlib_f32 *src, void *filter, mlib_s32 n);

mlib_status mlib_SignalEmphasize_F32S_F32S(mlib_f32 *dst, 
     const mlib_f32 *src, void *filter, mlib_s32 n);

Description

Each of these functions applies the preemphasizer to one signal packet and updates the filter states.

For monaural signals, the following equation is used:

dst[i] = src[i] - alpha*src[i - 1]

where i = 0, 1, ..., (n - 1); src[-1] = 0.

For stereo signals, the following equation is used:

dst[2*i]     = src[2*i]     - alpha*src[2*(i - 1)]
dst[2*i + 1] = src[2*i + 1] - alpha*src[2*(i - 1) + 1]

where i = 0, 1, ..., (n - 1); src[-2] = src[-1] = 0.

Parameters

Each of the functions takes the following arguments:

dst

Destination signal array.

src

Source signal array.

filter

Internal filter structure.

n

Number of samples in the source signal array.

Return Values

Each of the functions returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

Attributes

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE Interface Stability Committed MT-Level MT-Safe

See also

mlib_SignalEmphasizeFree_S16_S16(3MLIB), mlib_SignalEmphasizeInit_S16_S16(3MLIB), attributes(5)