CMSIS-DSP  Version 1.7.0
CMSIS DSP Software Library
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Vector Subtraction

Functions

void arm_sub_f32 (const float32_t *pSrcA, const float32_t *pSrcB, float32_t *pDst, uint32_t blockSize)
 Floating-point vector subtraction. More...
 
void arm_sub_q15 (const q15_t *pSrcA, const q15_t *pSrcB, q15_t *pDst, uint32_t blockSize)
 Q15 vector subtraction. More...
 
void arm_sub_q31 (const q31_t *pSrcA, const q31_t *pSrcB, q31_t *pDst, uint32_t blockSize)
 Q31 vector subtraction. More...
 
void arm_sub_q7 (const q7_t *pSrcA, const q7_t *pSrcB, q7_t *pDst, uint32_t blockSize)
 Q7 vector subtraction. More...
 

Description

Element-by-element subtraction of two vectors.

    pDst[n] = pSrcA[n] - pSrcB[n],   0 <= n < blockSize.

There are separate functions for floating-point, Q7, Q15, and Q31 data types.

Function Documentation

void arm_sub_f32 ( const float32_t pSrcA,
const float32_t pSrcB,
float32_t pDst,
uint32_t  blockSize 
)
Parameters
[in]pSrcApoints to the first input vector
[in]pSrcBpoints to the second input vector
[out]pDstpoints to the output vector
[in]blockSizenumber of samples in each vector
Returns
none
void arm_sub_q15 ( const q15_t pSrcA,
const q15_t pSrcB,
q15_t pDst,
uint32_t  blockSize 
)
Parameters
[in]pSrcApoints to the first input vector
[in]pSrcBpoints to the second 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. Results outside of the allowable Q15 range [0x8000 0x7FFF] are saturated.
void arm_sub_q31 ( const q31_t pSrcA,
const q31_t pSrcB,
q31_t pDst,
uint32_t  blockSize 
)
Parameters
[in]pSrcApoints to the first input vector
[in]pSrcBpoints to the second 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. Results outside of the allowable Q31 range [0x80000000 0x7FFFFFFF] are saturated.
void arm_sub_q7 ( const q7_t pSrcA,
const q7_t pSrcB,
q7_t pDst,
uint32_t  blockSize 
)
Parameters
[in]pSrcApoints to the first input vector
[in]pSrcBpoints to the second 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. Results outside of the allowable Q7 range [0x80 0x7F] will be saturated.