Partial Convolution

Functions
arm_status	arm_conv_partial_f32 (float32_t *pSrcA, uint32_t srcALen, float32_t *pSrcB, uint32_t srcBLen, float32_t *pDst, uint32_t firstIndex, uint32_t numPoints)
	Partial convolution of floating-point sequences. More...
arm_status	arm_conv_partial_fast_opt_q15 (q15_t *pSrcA, uint32_t srcALen, q15_t *pSrcB, uint32_t srcBLen, q15_t *pDst, uint32_t firstIndex, uint32_t numPoints, q15_t *pScratch1, q15_t *pScratch2)
	Partial convolution of Q15 sequences (fast version) for Cortex-M3 and Cortex-M4. More...
arm_status	arm_conv_partial_fast_q15 (q15_t *pSrcA, uint32_t srcALen, q15_t *pSrcB, uint32_t srcBLen, q15_t *pDst, uint32_t firstIndex, uint32_t numPoints)
	Partial convolution of Q15 sequences (fast version) for Cortex-M3 and Cortex-M4. More...
arm_status	arm_conv_partial_fast_q31 (q31_t *pSrcA, uint32_t srcALen, q31_t *pSrcB, uint32_t srcBLen, q31_t *pDst, uint32_t firstIndex, uint32_t numPoints)
	Partial convolution of Q31 sequences (fast version) for Cortex-M3 and Cortex-M4. More...
arm_status	arm_conv_partial_opt_q15 (q15_t *pSrcA, uint32_t srcALen, q15_t *pSrcB, uint32_t srcBLen, q15_t *pDst, uint32_t firstIndex, uint32_t numPoints, q15_t *pScratch1, q15_t *pScratch2)
	Partial convolution of Q15 sequences. More...
arm_status	arm_conv_partial_opt_q7 (q7_t *pSrcA, uint32_t srcALen, q7_t *pSrcB, uint32_t srcBLen, q7_t *pDst, uint32_t firstIndex, uint32_t numPoints, q15_t *pScratch1, q15_t *pScratch2)
	Partial convolution of Q7 sequences. More...
arm_status	arm_conv_partial_q15 (q15_t *pSrcA, uint32_t srcALen, q15_t *pSrcB, uint32_t srcBLen, q15_t *pDst, uint32_t firstIndex, uint32_t numPoints)
	Partial convolution of Q15 sequences. More...
arm_status	arm_conv_partial_q31 (q31_t *pSrcA, uint32_t srcALen, q31_t *pSrcB, uint32_t srcBLen, q31_t *pDst, uint32_t firstIndex, uint32_t numPoints)
	Partial convolution of Q31 sequences. More...
arm_status	arm_conv_partial_q7 (q7_t *pSrcA, uint32_t srcALen, q7_t *pSrcB, uint32_t srcBLen, q7_t *pDst, uint32_t firstIndex, uint32_t numPoints)
	Partial convolution of Q7 sequences. More...

Detailed Description

Partial Convolution is equivalent to Convolution except that a subset of the output samples is generated. Each function has two additional arguments. firstIndex specifies the starting index of the subset of output samples. numPoints is the number of output samples to compute. The function computes the output in the range [firstIndex, ..., firstIndex+numPoints-1]. The output array pDst contains numPoints values.

The allowable range of output indices is [0 srcALen+srcBLen-2]. If the requested subset does not fall in this range then the functions return ARM_MATH_ARGUMENT_ERROR. Otherwise the functions return ARM_MATH_SUCCESS.

Note

Refer arm_conv_f32() for details on fixed point behavior.

Fast Versions

Fast versions are supported for Q31 and Q15 of partial convolution. Cycles for Fast versions are less compared to Q31 and Q15 of partial conv and the design requires the input signals should be scaled down to avoid intermediate overflows.

Opt Versions

Opt versions are supported for Q15 and Q7. Design uses internal scratch buffer for getting good optimisation. These versions are optimised in cycles and consumes more memory(Scratch memory) compared to Q15 and Q7 versions of partial convolution

Function Documentation

arm_status arm_conv_partial_f32	(	float32_t *	pSrcA,
		uint32_t	srcALen,
		float32_t *	pSrcB,
		uint32_t	srcBLen,
		float32_t *	pDst,
		uint32_t	firstIndex,
		uint32_t	numPoints
	)

Partial convolution of floating-point sequences.

Parameters

[in]	*pSrcA	points to the first input sequence.
[in]	srcALen	length of the first input sequence.
[in]	*pSrcB	points to the second input sequence.
[in]	srcBLen	length of the second input sequence.
[out]	*pDst	points to the location where the output result is written.
[in]	firstIndex	is the first output sample to start with.
[in]	numPoints	is the number of output points to be computed.

Returns

Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].

Definition at line 95 of file arm_conv_partial_f32.c.

arm_status arm_conv_partial_fast_opt_q15	(	q15_t *	pSrcA,
		uint32_t	srcALen,
		q15_t *	pSrcB,
		uint32_t	srcBLen,
		q15_t *	pDst,
		uint32_t	firstIndex,
		uint32_t	numPoints,
		q15_t *	pScratch1,
		q15_t *	pScratch2
	)

Partial convolution of Q15 sequences (fast version) for Cortex-M3 and Cortex-M4.

Parameters

[in]	*pSrcA	points to the first input sequence.
[in]	srcALen	length of the first input sequence.
[in]	*pSrcB	points to the second input sequence.
[in]	srcBLen	length of the second input sequence.
[out]	*pDst	points to the location where the output result is written.
[in]	firstIndex	is the first output sample to start with.
[in]	numPoints	is the number of output points to be computed.
[in]	*pScratch1	points to scratch buffer of size max(srcALen, srcBLen) + 2*min(srcALen, srcBLen) - 2.
[in]	*pScratch2	points to scratch buffer of size min(srcALen, srcBLen).

Returns

Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].

See arm_conv_partial_q15() for a slower implementation of this function which uses a 64-bit accumulator to avoid wrap around distortion.

Restrictions

If the silicon does not support unaligned memory access enable the macro UNALIGNED_SUPPORT_DISABLE In this case input, output, scratch1 and scratch2 buffers should be aligned by 32-bit

Definition at line 75 of file arm_conv_partial_fast_opt_q15.c.

arm_status arm_conv_partial_fast_q15	(	q15_t *	pSrcA,
		uint32_t	srcALen,
		q15_t *	pSrcB,
		uint32_t	srcBLen,
		q15_t *	pDst,
		uint32_t	firstIndex,
		uint32_t	numPoints
	)

Partial convolution of Q15 sequences (fast version) for Cortex-M3 and Cortex-M4.

Parameters

[in]	*pSrcA	points to the first input sequence.
[in]	srcALen	length of the first input sequence.
[in]	*pSrcB	points to the second input sequence.
[in]	srcBLen	length of the second input sequence.
[out]	*pDst	points to the location where the output result is written.
[in]	firstIndex	is the first output sample to start with.
[in]	numPoints	is the number of output points to be computed.

Returns

Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].

See arm_conv_partial_q15() for a slower implementation of this function which uses a 64-bit accumulator to avoid wrap around distortion.

Definition at line 67 of file arm_conv_partial_fast_q15.c.

arm_status arm_conv_partial_fast_q31	(	q31_t *	pSrcA,
		uint32_t	srcALen,
		q31_t *	pSrcB,
		uint32_t	srcBLen,
		q31_t *	pDst,
		uint32_t	firstIndex,
		uint32_t	numPoints
	)

Partial convolution of Q31 sequences (fast version) for Cortex-M3 and Cortex-M4.

Parameters

[in]	*pSrcA	points to the first input sequence.
[in]	srcALen	length of the first input sequence.
[in]	*pSrcB	points to the second input sequence.
[in]	srcBLen	length of the second input sequence.
[out]	*pDst	points to the location where the output result is written.
[in]	firstIndex	is the first output sample to start with.
[in]	numPoints	is the number of output points to be computed.

Returns

Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].

See arm_conv_partial_q31() for a slower implementation of this function which uses a 64-bit accumulator to provide higher precision.

Definition at line 67 of file arm_conv_partial_fast_q31.c.

arm_status arm_conv_partial_opt_q15	(	q15_t *	pSrcA,
		uint32_t	srcALen,
		q15_t *	pSrcB,
		uint32_t	srcBLen,
		q15_t *	pDst,
		uint32_t	firstIndex,
		uint32_t	numPoints,
		q15_t *	pScratch1,
		q15_t *	pScratch2
	)

Partial convolution of Q15 sequences.

Parameters

[in]	*pSrcA	points to the first input sequence.
[in]	srcALen	length of the first input sequence.
[in]	*pSrcB	points to the second input sequence.
[in]	srcBLen	length of the second input sequence.
[out]	*pDst	points to the location where the output result is written.
[in]	firstIndex	is the first output sample to start with.
[in]	numPoints	is the number of output points to be computed.
[in]	*pScratch1	points to scratch buffer of size max(srcALen, srcBLen) + 2*min(srcALen, srcBLen) - 2.
[in]	*pScratch2	points to scratch buffer of size min(srcALen, srcBLen).

Returns

Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].

Restrictions

If the silicon does not support unaligned memory access enable the macro UNALIGNED_SUPPORT_DISABLE In this case input, output, state buffers should be aligned by 32-bit

Refer to arm_conv_partial_fast_q15() for a faster but less precise version of this function for Cortex-M3 and Cortex-M4.

Definition at line 76 of file arm_conv_partial_opt_q15.c.

arm_status arm_conv_partial_opt_q7	(	q7_t *	pSrcA,
		uint32_t	srcALen,
		q7_t *	pSrcB,
		uint32_t	srcBLen,
		q7_t *	pDst,
		uint32_t	firstIndex,
		uint32_t	numPoints,
		q15_t *	pScratch1,
		q15_t *	pScratch2
	)

Partial convolution of Q7 sequences.

Parameters

[in]	*pSrcA	points to the first input sequence.
[in]	srcALen	length of the first input sequence.
[in]	*pSrcB	points to the second input sequence.
[in]	srcBLen	length of the second input sequence.
[out]	*pDst	points to the location where the output result is written.
[in]	firstIndex	is the first output sample to start with.
[in]	numPoints	is the number of output points to be computed.
[in]	*pScratch1	points to scratch buffer(of type q15_t) of size max(srcALen, srcBLen) + 2*min(srcALen, srcBLen) - 2.
[in]	*pScratch2	points to scratch buffer (of type q15_t) of size min(srcALen, srcBLen).

Returns

Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].

Restrictions

If the silicon does not support unaligned memory access enable the macro UNALIGNED_SUPPORT_DISABLE In this case input, output, scratch1 and scratch2 buffers should be aligned by 32-bit

Definition at line 76 of file arm_conv_partial_opt_q7.c.

arm_status arm_conv_partial_q15	(	q15_t *	pSrcA,
		uint32_t	srcALen,
		q15_t *	pSrcB,
		uint32_t	srcBLen,
		q15_t *	pDst,
		uint32_t	firstIndex,
		uint32_t	numPoints
	)

Partial convolution of Q15 sequences.

Parameters

[in]	*pSrcA	points to the first input sequence.
[in]	srcALen	length of the first input sequence.
[in]	*pSrcB	points to the second input sequence.
[in]	srcBLen	length of the second input sequence.
[out]	*pDst	points to the location where the output result is written.
[in]	firstIndex	is the first output sample to start with.
[in]	numPoints	is the number of output points to be computed.

Returns

Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].

Refer to arm_conv_partial_fast_q15() for a faster but less precise version of this function for Cortex-M3 and Cortex-M4.

Refer the function arm_conv_partial_opt_q15() for a faster implementation of this function using scratch buffers.

Definition at line 71 of file arm_conv_partial_q15.c.

arm_status arm_conv_partial_q31	(	q31_t *	pSrcA,
		uint32_t	srcALen,
		q31_t *	pSrcB,
		uint32_t	srcBLen,
		q31_t *	pDst,
		uint32_t	firstIndex,
		uint32_t	numPoints
	)

Partial convolution of Q31 sequences.

Parameters

[in]	*pSrcA	points to the first input sequence.
[in]	srcALen	length of the first input sequence.
[in]	*pSrcB	points to the second input sequence.
[in]	srcBLen	length of the second input sequence.
[out]	*pDst	points to the location where the output result is written.
[in]	firstIndex	is the first output sample to start with.
[in]	numPoints	is the number of output points to be computed.

Returns

Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].

See arm_conv_partial_fast_q31() for a faster but less precise implementation of this function for Cortex-M3 and Cortex-M4.

Definition at line 66 of file arm_conv_partial_q31.c.

arm_status arm_conv_partial_q7	(	q7_t *	pSrcA,
		uint32_t	srcALen,
		q7_t *	pSrcB,
		uint32_t	srcBLen,
		q7_t *	pDst,
		uint32_t	firstIndex,
		uint32_t	numPoints
	)

Partial convolution of Q7 sequences.

Parameters

[in]	*pSrcA	points to the first input sequence.
[in]	srcALen	length of the first input sequence.
[in]	*pSrcB	points to the second input sequence.
[in]	srcBLen	length of the second input sequence.
[out]	*pDst	points to the location where the output result is written.
[in]	firstIndex	is the first output sample to start with.
[in]	numPoints	is the number of output points to be computed.

Returns

Returns either ARM_MATH_SUCCESS if the function completed correctly or ARM_MATH_ARGUMENT_ERROR if the requested subset is not in the range [0 srcALen+srcBLen-2].

Refer the function arm_conv_partial_opt_q7() for a faster implementation of this function.

Definition at line 68 of file arm_conv_partial_q7.c.