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dsPIC ? DSC Acoustic Echo Cancellation Library User’s Guide
EC_apply
Description
Applies acoustic echo cancellation to the current frame of data.
Include
ec_api.h
Prototype
void EC_apply(int* ptrStateX, int* yScratchMem, int* nearEndIn,
int* farEndIn, int enable);
Arguments
ptrStateX
yScratchMem
nearEndIn
farEndIn
enable
a pointer to the X memory for this instance of AEC
a pointer to an area of scratch memory in Y RAM used by
the AEC algorithm
a pointer to the near-end speech input (S IN ) signal on buffer of
size EC_FRAME . This buffer can be in X or Y memory
a pointer to the far-end speech receive input (R IN ) signal on
buffer of size EC_FRAME . This buffer can be in X or Y memory
a flag to indicate if AEC is required for this buffer
( EC_TRUE or EC_FALSE )
Return Value
None.
Remarks
The AEC algorithm is process-in-place, meaning that the output is passed back in the
input buffer. Setting Enable to EC_FALSE returns an un-processed buffer of data, but
the AEC algorithm still adapts on the data.
Code Example
int ecStateMemX [EC_XSTATE_MEM_SIZE_INT] _XBSS(2);
int ecScratchY [EC_YSCRATCH_MEM_SIZE_INT] _YBSS(2);
int ecScratchX [EC_XSCRATCH_MEM_SIZE_INT] _XBSS(2);
.
.
.
EC_init(ecStateMemX, ecScratchX, EC_ORDER);
.
.
.
EC_apply(ecStateMemX, ecScratchY, nearEndIn, farEndIn, EC_TRUE);
DS70134F-page 42
? 2004-2011 Microchip Technology Inc.
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