From 96d6da4e252b06dcfdc041e7df23e86161c33007 Mon Sep 17 00:00:00 2001 From: rihab kouki Date: Tue, 28 Jul 2020 11:24:49 +0100 Subject: Official ARM version: v5.6.0 --- docs/DSP/html/group__BasicScale.html | 374 +++++++++++++++++++++++++++++++++++ 1 file changed, 374 insertions(+) create mode 100644 docs/DSP/html/group__BasicScale.html (limited to 'docs/DSP/html/group__BasicScale.html') diff --git a/docs/DSP/html/group__BasicScale.html b/docs/DSP/html/group__BasicScale.html new file mode 100644 index 0000000..1b016d6 --- /dev/null +++ b/docs/DSP/html/group__BasicScale.html @@ -0,0 +1,374 @@ + + + + + +Vector Scale +CMSIS-DSP: Vector Scale + + + + + + + + + + + + + + +
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CMSIS-DSP +  Version 1.7.0 +
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CMSIS DSP Software Library
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+Functions
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Vector Scale
Basic Math Functions
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+Functions

void arm_scale_f32 (const float32_t *pSrc, float32_t scale, float32_t *pDst, uint32_t blockSize)
 Multiplies a floating-point vector by a scalar. More...
 
void arm_scale_q15 (const q15_t *pSrc, q15_t scaleFract, int8_t shift, q15_t *pDst, uint32_t blockSize)
 Multiplies a Q15 vector by a scalar. More...
 
void arm_scale_q31 (const q31_t *pSrc, q31_t scaleFract, int8_t shift, q31_t *pDst, uint32_t blockSize)
 Multiplies a Q31 vector by a scalar. More...
 
void arm_scale_q7 (const q7_t *pSrc, q7_t scaleFract, int8_t shift, q7_t *pDst, uint32_t blockSize)
 Multiplies a Q7 vector by a scalar. More...
 
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Description

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Multiply a vector by a scalar value. For floating-point data, the algorithm used is:

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+    pDst[n] = pSrc[n] * scale,   0 <= n < blockSize.
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In the fixed-point Q7, Q15, and Q31 functions, scale is represented by a fractional multiplication scaleFract and an arithmetic shift shift. The shift allows the gain of the scaling operation to exceed 1.0. The algorithm used with fixed-point data is:

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+    pDst[n] = (pSrc[n] * scaleFract) << shift,   0 <= n < blockSize.
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The overall scale factor applied to the fixed-point data is

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+    scale = scaleFract * 2^shift.
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The functions support in-place computation allowing the source and destination pointers to reference the same memory buffer.

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Function Documentation

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void arm_scale_f32 (const float32_t * pSrc,
float32_t scale,
float32_t * pDst,
uint32_t blockSize 
)
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Parameters
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[in]pSrcpoints to the input vector
[in]scalescale factor to be applied
[out]pDstpoints to the output vector
[in]blockSizenumber of samples in each vector
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Returns
none
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void arm_scale_q15 (const q15_t * pSrc,
q15_t scaleFract,
int8_t shift,
q15_t * pDst,
uint32_t blockSize 
)
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Parameters
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[in]pSrcpoints to the input vector
[in]scaleFractfractional portion of the scale value
[in]shiftnumber of bits to shift the result by
[out]pDstpoints to the output vector
[in]blockSizenumber of samples in each vector
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Returns
none
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Scaling and Overflow Behavior
The input data *pSrc and scaleFract are in 1.15 format. These are multiplied to yield a 2.30 intermediate result and this is shifted with saturation to 1.15 format.
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void arm_scale_q31 (const q31_t * pSrc,
q31_t scaleFract,
int8_t shift,
q31_t * pDst,
uint32_t blockSize 
)
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Parameters
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[in]pSrcpoints to the input vector
[in]scaleFractfractional portion of the scale value
[in]shiftnumber of bits to shift the result by
[out]pDstpoints to the output vector
[in]blockSizenumber of samples in each vector
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Returns
none
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Scaling and Overflow Behavior
The input data *pSrc and scaleFract are in 1.31 format. These are multiplied to yield a 2.62 intermediate result and this is shifted with saturation to 1.31 format.
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void arm_scale_q7 (const q7_t * pSrc,
q7_t scaleFract,
int8_t shift,
q7_t * pDst,
uint32_t blockSize 
)
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Parameters
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[in]pSrcpoints to the input vector
[in]scaleFractfractional portion of the scale value
[in]shiftnumber of bits to shift the result by
[out]pDstpoints to the output vector
[in]blockSizenumber of samples in each vector
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Returns
none
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Scaling and Overflow Behavior
The input data *pSrc and scaleFract are in 1.7 format. These are multiplied to yield a 2.14 intermediate result and this is shifted with saturation to 1.7 format.
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+ + + + -- cgit