CMSIS-DSP  Version 1.7.0
CMSIS DSP Software Library
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Vector Absolute Value

Functions

void arm_abs_f32 (const float32_t *pSrc, float32_t *pDst, uint32_t blockSize)
 Floating-point vector absolute value. More...
 
void arm_abs_q15 (const q15_t *pSrc, q15_t *pDst, uint32_t blockSize)
 Q15 vector absolute value. More...
 
void arm_abs_q31 (const q31_t *pSrc, q31_t *pDst, uint32_t blockSize)
 Q31 vector absolute value. More...
 
void arm_abs_q7 (const 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 ( const float32_t pSrc,
float32_t pDst,
uint32_t  blockSize 
)
Parameters
[in]pSrcpoints to the input vector
[out]pDstpoints to the output vector
[in]blockSizenumber of samples in each vector
Returns
none
void arm_abs_q15 ( const q15_t pSrc,
q15_t pDst,
uint32_t  blockSize 
)
Parameters
[in]pSrcpoints to the input vector
[out]pDstpoints to the output vector
[in]blockSizenumber 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.
void arm_abs_q31 ( const q31_t pSrc,
q31_t pDst,
uint32_t  blockSize 
)
Parameters
[in]pSrcpoints to the input vector
[out]pDstpoints to the output vector
[in]blockSizenumber 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.
void arm_abs_q7 ( const q7_t pSrc,
q7_t pDst,
uint32_t  blockSize 
)
Parameters
[in]pSrcpoints to the input vector
[out]pDstpoints to the output vector
[in]blockSizenumber 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.