Vector Absolute Value

Functions
void	arm_abs_f32 (float32_t *pSrc, float32_t *pDst, uint32_t blockSize)
	Floating-point vector absolute value. More...
void	arm_abs_q15 (q15_t *pSrc, q15_t *pDst, uint32_t blockSize)
	Q15 vector absolute value. More...
void	arm_abs_q31 (q31_t *pSrc, q31_t *pDst, uint32_t blockSize)
	Q31 vector absolute value. More...
void	arm_abs_q7 (q7_t *pSrc, q7_t *pDst, uint32_t blockSize)
	Q7 vector absolute value. More...

Description

Computes the absolute value of a vector on an element-by-element basis.

    pDst[n] = abs(pSrc[n]),   0 <= n < blockSize.

The functions support in-place computation allowing the source and destination pointers to reference the same memory buffer. There are separate functions for floating-point, Q7, Q15, and Q31 data types.

Function Documentation

void arm_abs_f32	(	float32_t *	pSrc,
		float32_t *	pDst,
		uint32_t	blockSize
	)

Parameters

[in]	*pSrc	points to the input buffer
[out]	*pDst	points to the output buffer
[in]	blockSize	number of samples in each vector

Returns

none.

References blockSize.

Referenced by main().

void arm_abs_q15	(	q15_t *	pSrc,
		q15_t *	pDst,
		uint32_t	blockSize
	)

Parameters

[in]	*pSrc	points to the input buffer
[out]	*pDst	points to the output buffer
[in]	blockSize	number of samples in each vector

Returns

none.

Scaling and Overflow Behavior:

The function uses saturating arithmetic. The Q15 value -1 (0x8000) will be saturated to the maximum allowable positive value 0x7FFF.

References __PKHBT, __QSUB16(), __SIMD32_CONST, and blockSize.

void arm_abs_q31	(	q31_t *	pSrc,
		q31_t *	pDst,
		uint32_t	blockSize
	)

Parameters

[in]	*pSrc	points to the input buffer
[out]	*pDst	points to the output buffer
[in]	blockSize	number of samples in each vector

Returns

none.

Scaling and Overflow Behavior:

The function uses saturating arithmetic. The Q31 value -1 (0x80000000) will be saturated to the maximum allowable positive value 0x7FFFFFFF.

References __QSUB(), and blockSize.

void arm_abs_q7	(	q7_t *	pSrc,
		q7_t *	pDst,
		uint32_t	blockSize
	)

Parameters

[in]	*pSrc	points to the input buffer
[out]	*pDst	points to the output buffer
[in]	blockSize	number of samples in each vector

Returns

none.

Conditions for optimum performance

Input and output buffers should be aligned by 32-bit

Scaling and Overflow Behavior:

The function uses saturating arithmetic. The Q7 value -1 (0x80) will be saturated to the maximum allowable positive value 0x7F.

References __QSUB8(), and blockSize.