Vector Absolute Value

Functions
void	arm_abs_f16 (const float16_t *pSrc, float16_t *pDst, uint32_t blockSize)
	Floating-point vector absolute value.
void	arm_abs_f32 (const float32_t *pSrc, float32_t *pDst, uint32_t blockSize)
	Floating-point vector absolute value.
void	arm_abs_f64 (const float64_t *pSrc, float64_t *pDst, uint32_t blockSize)
	Floating-point vector absolute value.
void	arm_abs_q15 (const q15_t *pSrc, q15_t *pDst, uint32_t blockSize)
	Q15 vector absolute value.
void	arm_abs_q31 (const q31_t *pSrc, q31_t *pDst, uint32_t blockSize)
	Q31 vector absolute value.
void	arm_abs_q7 (const q7_t *pSrc, q7_t *pDst, uint32_t blockSize)
	Q7 vector absolute value.

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

arm_abs_f16()

void arm_abs_f16	(	const float16_t *	pSrc,
		float16_t *	pDst,
		uint32_t	blockSize
	)

Floating-point vector absolute value.

Parameters

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

arm_abs_f32()

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

Floating-point vector absolute value.

Parameters

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

arm_abs_f64()

void arm_abs_f64	(	const float64_t *	pSrc,
		float64_t *	pDst,
		uint32_t	blockSize
	)

Floating-point vector absolute value.

Parameters

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

arm_abs_q15()

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

Q15 vector absolute value.

Parameters

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

Scaling and Overflow Behavior

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

arm_abs_q31()

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

Q31 vector absolute value.

Parameters

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

Scaling and Overflow Behavior

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

arm_abs_q7()

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

Q7 vector absolute value.

Parameters

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

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.