From 76177aa280494bb36d7a0bcbda1078d4db717020 Mon Sep 17 00:00:00 2001 From: Ali Labbene Date: Mon, 9 Dec 2019 11:25:19 +0100 Subject: Official ARM version: v4.5 --- Documentation/DSP/html/group__cmplx__mag.html | 288 ++++++++++++++++++++++++++ 1 file changed, 288 insertions(+) create mode 100644 Documentation/DSP/html/group__cmplx__mag.html (limited to 'Documentation/DSP/html/group__cmplx__mag.html') diff --git a/Documentation/DSP/html/group__cmplx__mag.html b/Documentation/DSP/html/group__cmplx__mag.html new file mode 100644 index 0000000..7d91cb1 --- /dev/null +++ b/Documentation/DSP/html/group__cmplx__mag.html @@ -0,0 +1,288 @@ + + + + + +Complex Magnitude +CMSIS-DSP: Complex Magnitude + + + + + + + + + + + + + + + +
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CMSIS-DSP +  Version 1.4.7 +
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CMSIS DSP Software Library
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+Functions
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Complex Magnitude
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Complex Math Functions
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+Functions

void arm_cmplx_mag_f32 (float32_t *pSrc, float32_t *pDst, uint32_t numSamples)
 Floating-point complex magnitude.
 
void arm_cmplx_mag_q15 (q15_t *pSrc, q15_t *pDst, uint32_t numSamples)
 Q15 complex magnitude.
 
void arm_cmplx_mag_q31 (q31_t *pSrc, q31_t *pDst, uint32_t numSamples)
 Q31 complex magnitude.
 
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Description

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Computes the magnitude of the elements of a complex data vector.

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The pSrc points to the source data and pDst points to the where the result should be written. numSamples specifies the number of complex samples in the input array and the data is stored in an interleaved fashion (real, imag, real, imag, ...). The input array has a total of 2*numSamples values; the output array has a total of numSamples values. The underlying algorithm is used:

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+for(n=0; n<numSamples; n++) {    
+    pDst[n] = sqrt(pSrc[(2*n)+0]^2 + pSrc[(2*n)+1]^2);    
+}    
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There are separate functions for floating-point, Q15, and Q31 data types.

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Function Documentation

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void arm_cmplx_mag_f32 (float32_t * pSrc,
float32_t * pDst,
uint32_t numSamples 
)
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Parameters
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[in]*pSrcpoints to complex input buffer
[out]*pDstpoints to real output buffer
[in]numSamplesnumber of complex samples in the input vector
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Returns
none.
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Examples:
arm_fft_bin_example_f32.c.
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References arm_sqrt_f32().

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Referenced by main().

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void arm_cmplx_mag_q15 (q15_t * pSrc,
q15_t * pDst,
uint32_t numSamples 
)
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Parameters
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*pSrcpoints to the complex input vector
*pDstpoints to the real output vector
numSamplesnumber of complex samples in the input vector
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Returns
none.
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Scaling and Overflow Behavior:

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The function implements 1.15 by 1.15 multiplications and finally output is converted into 2.14 format.
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References __SIMD32, and arm_sqrt_q15().

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void arm_cmplx_mag_q31 (q31_t * pSrc,
q31_t * pDst,
uint32_t numSamples 
)
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Parameters
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*pSrcpoints to the complex input vector
*pDstpoints to the real output vector
numSamplesnumber of complex samples in the input vector
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Returns
none.
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Scaling and Overflow Behavior:

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The function implements 1.31 by 1.31 multiplications and finally output is converted into 2.30 format. Input down scaling is not required.
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References arm_sqrt_q31().

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+ + + + -- cgit