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]	pSrcA	points to the first input vector
[in]	pSrcB	points to the second input vector
[out]	pDst	points to the output vector
[in]	blockSize	number 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]	pSrcA	points to the first input vector
[in]	pSrcB	points to the second input vector
[out]	pDst	points to the output vector
[in]	blockSize	number 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]	pSrcA	points to the first input vector
[in]	pSrcB	points to the second input vector
[out]	pDst	points to the output vector
[in]	blockSize	number 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]	pSrcA	points to the first input vector
[in]	pSrcB	points to the second input vector
[out]	pDst	points to the output vector
[in]	blockSize	number 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.