Eli Hughes / CMSIS_DSP_401

V4.0.1 of the ARM CMSIS DSP libraries. Note that arm_bitreversal2.s, arm_cfft_f32.c and arm_rfft_fast_f32.c had to be removed. arm_bitreversal2.s will not assemble with the online tools. So, the fast f32 FFT functions are not yet available. All the other FFT functions are available.

Dependents:   MPU9150_Example fir_f32 fir_f32 MPU9150_nucleo_noni2cdev ... more

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Complex Magnitude
Functions

Complex Magnitude
[Complex Math Functions]

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

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.

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.

Function Documentation

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

Floating-point complex magnitude.

Parameters:
[in]*pSrcpoints to complex input buffer
[out]*pDstpoints to real output buffer
[in]numSamplesnumber of complex samples in the input vector
Returns:
none.

Definition at line 84 of file arm_cmplx_mag_f32.c.

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

Q15 complex magnitude.

Parameters:
*pSrcpoints to the complex input vector
*pDstpoints to the real output vector
numSamplesnumber of complex samples in the input vector
Returns:
none.

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 65 of file arm_cmplx_mag_q15.c.

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

Q31 complex magnitude.

Parameters:
*pSrcpoints to the complex input vector
*pDstpoints to the real output vector
numSamplesnumber 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 65 of file arm_cmplx_mag_q31.c.

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