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CMSIS DSP library

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Vector Absolute Value
Functions

Vector Absolute Value
[Basic Math Functions]

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

Functions

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

Detailed 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 
)

Floating-point vector absolute value.

Parameters:
[in]*pSrcpoints to the input buffer
[out]*pDstpoints to the output buffer
[in]blockSizenumber of samples in each vector
Returns:
none.

Definition at line 75 of file arm_abs_f32.c.

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

Q15 vector absolute value.

Parameters:
[in]*pSrcpoints to the input buffer
[out]*pDstpoints to the output buffer
[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.

Definition at line 65 of file arm_abs_q15.c.

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

Q31 vector absolute value.

Parameters:
[in]*pSrcpoints to the input buffer
[out]*pDstpoints to the output buffer
[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.

Definition at line 66 of file arm_abs_q31.c.

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

Q7 vector absolute value.

Parameters:
[in]*pSrcpoints to the input buffer
[out]*pDstpoints to the output buffer
[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.

Definition at line 69 of file arm_abs_q7.c.

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