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 Conjugate
Functions

Complex Conjugate
[Complex Math Functions]

Conjugates the elements of a complex data vector. More...

Functions

void arm_cmplx_conj_f32 (float32_t *pSrc, float32_t *pDst, uint32_t numSamples)
 Floating-point complex conjugate.
void arm_cmplx_conj_q15 (q15_t *pSrc, q15_t *pDst, uint32_t numSamples)
 Q15 complex conjugate.
void arm_cmplx_conj_q31 (q31_t *pSrc, q31_t *pDst, uint32_t numSamples)
 Q31 complex conjugate.

Detailed Description

Conjugates 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 and the data in each array is stored in an interleaved fashion (real, imag, real, imag, ...). Each array has a total of 2*numSamples values. The underlying algorithm is used:

        
 for(n=0; n<numSamples; n++) {        
     pDst[(2*n)+0)] = pSrc[(2*n)+0];     // real part        
     pDst[(2*n)+1)] = -pSrc[(2*n)+1];    // imag part        
 }

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

Function Documentation

void arm_cmplx_conj_f32 ( float32_t *  pSrc,
float32_t *  pDst,
uint32_t  numSamples 
)

Floating-point complex conjugate.

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

Definition at line 82 of file arm_cmplx_conj_f32.c.

void arm_cmplx_conj_q15 ( q15_t *  pSrc,
q15_t *  pDst,
uint32_t  numSamples 
)

Q15 complex conjugate.

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

Scaling and Overflow Behavior:

The function uses saturating arithmetic. The Q15 value -1 (0x8000) will be saturated to the maximum allowable positive value 0x7FFF.

Definition at line 65 of file arm_cmplx_conj_q15.c.

void arm_cmplx_conj_q31 ( q31_t *  pSrc,
q31_t *  pDst,
uint32_t  numSamples 
)

Q31 complex conjugate.

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

Scaling and Overflow Behavior:

The function uses saturating arithmetic. The Q31 value -1 (0x80000000) will be saturated to the maximum allowable positive value 0x7FFFFFFF.

Definition at line 64 of file arm_cmplx_conj_q31.c.

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