mlib_SignalAutoCorrel_S16(3MLIB)			    mediaLib Library Functions				  mlib_SignalAutoCorrel_S16(3MLIB)

NAME

       mlib_SignalAutoCorrel_S16, mlib_SignalAutoCorrel_S16S, mlib_SignalAutoCorrel_F32, mlib_SignalAutoCorrel_F32S - signal auto-correlation

SYNOPSIS

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

       mlib_status mlib_SignalAutoCorrel_S16(mlib_d64 *correl,
	    const mlib_s16 *src, mlib_s32 disp, mlib_s32 n);

       mlib_status mlib_SignalAutoCorrel_S16S(mlib_d64 *correl,
	    const mlib_s16 *src, mlib_s32 disp, mlib_s32 n);

       mlib_status mlib_SignalAutoCorrel_F32(mlib_d64 *correl,
	    const mlib_f32 *src, mlib_s32 disp, mlib_s32 n);

       mlib_status mlib_SignalAutoCorrel_F32S(mlib_d64 *correl,
	    const mlib_f32 *src, mlib_s32 disp, mlib_s32 n);

DESCRIPTION

       Each of these functions performs auto-correlation.

       For monaural signals, the following equation is used:

		       1    n-d-1
	 correl[0] = ----- * SUM (src[i] * src[i + d])
		     n - d   i=0

       For stereo signals, the following equation is used:

		       1    n-d-1
	 correl[0] = ----- * SUM (src[2*i] * src[2*(i + d)])
		     n - d   i=0

		       1    n-d-1
	 correl[1] = ----- * SUM (src[2*i + 1] * src[2*(i + d) + 1])
		     n - d   i=0

       where d = disp.

PARAMETERS

       Each of the functions takes the following arguments:

       correl	 Pointer to the auto-correlation array. In the stereo version, correl[0] contains the auto-correlation of channel 0, and correl[1]
		 contains the auto-correlation of channel 1.

       src	 Source signal array.

       disp	 Displacement. 0 <= disp < n.

       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_SignalCrossCorrel_S16(3MLIB), attributes(5)

SunOS 5.11							    2 Mar 2007					  mlib_SignalAutoCorrel_S16(3MLIB)