DSPF_sp_minerr
[Math]

Collaboration diagram for DSPF_sp_minerr:

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Detailed Description

float	DSPF_sp_minerr (const float *GSP0_TABLE, const float *errCoefs, int *restrict max_index)

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Function Documentation

float DSPF_sp_minerr	(	const float *	GSP0_TABLE,
		const float *	errCoefs,
		int *restrict	max_index
	)

Performs a dot product on 256 pairs of 9 element vectors and searches for the pair of vectors which produces the maximum dot product result. This is a large part of the VSELP vocoder codebook search. The function stores the index to the first element of the 9-element vector that resulted in the maximum dot product in the memory location Pointed by max_index. The maximum dot product value is returned by the function.

Parameters:

	GSP0_TABLE[256*9]	GSP0 terms array.
	errCoefs[9]	Array of error coefficients. Must be double-word aligned.
	max_index	Index to GSP0_TABLE[max_index], the first element of the 9-element vector that resulted in the maximum dot product.

Algorithm:

DSPF_sp_maxval_cn.c is the natural C equivalent of the optimized linear assembly code without restrictions. Note that the linear assembly code is optimized and restrictions may apply.

Assumptions:

errCoefs must be double-word aligned

Implementation Notes:

Interruptibility: The code is interruptible.
Endian Support: The code supports both big and little endian modes.

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Copyright 2014, Texas Instruments Incorporated