Complex Magnitude [Complex Math Functions]

Functions
void	arm_cmplx_mag_f32 (float32_t *pSrc, float32_t *pDst, uint32_t numSamples)
void	arm_cmplx_mag_q31 (q31_t *pSrc, q31_t *pDst, uint32_t numSamples)
void	arm_cmplx_mag_q15 (q15_t *pSrc, q15_t *pDst, uint32_t numSamples)

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Detailed Description

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

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:

      
 for(n=0; n<numSamples; n++) {      
     pDst[n] = sqrt(pSrc[(2*n)+0]^2 + pSrc[(2*n)+1]^2);      
 }      
 

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

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Function Documentation

void arm_cmplx_mag_f32	(	float32_t *	pSrc,
		float32_t *	pDst,
		uint32_t	numSamples
	)

Floating-point complex magnitude.

Parameters:

[in]	*pSrc	points to complex input buffer
[out]	*pDst	points to real output buffer
[in]	numSamples	number of complex samples in the input vector

Returns:

none.

Examples:

arm_fft_bin_example_f32.c.

Definition at line 67 of file arm_cmplx_mag_f32.c.

void arm_cmplx_mag_q31	(	q31_t *	pSrc,
		q31_t *	pDst,
		uint32_t	numSamples
	)

Q31 complex magnitude.

Parameters:

*pSrc	points to the complex input vector
*pDst	points to the real output vector
numSamples	number of complex samples in the input vector

Returns:

none.

Scaling and Overflow Behavior:

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

Definition at line 48 of file arm_cmplx_mag_q31.c.

void arm_cmplx_mag_q15	(	q15_t *	pSrc,
		q15_t *	pDst,
		uint32_t	numSamples
	)

Q15 complex magnitude.

Parameters:

*pSrc	points to the complex input vector
*pDst	points to the real output vector
numSamples	number of complex samples in the input vector

Returns:

none.

Conditions for optimum performance

Input and output buffers should be aligned by 32-bit

Scaling and Overflow Behavior:

The function implements 1.15 by 1.15 multiplications and finally output is converted into 2.14 format.

Definition at line 52 of file arm_cmplx_mag_q15.c.