Goertz
Computes the discrete Fourier transform for a given frequency for a single signal.
The function interface declaration is as follows:
Operations on floating point numbers:
HmppResult HMPPS_Goertz_32f(const float *src, int32_t len, Hmpp32fc *res, float freq)
HmppResult HMPPS_Goertz_64f(const double *src, int32_t len, Hmpp64fc *res, double freq);
HmppResult HMPPS_Goertz_32fc(const Hmpp32fc *src, int32_t len, Hmpp32fc *res, float freq);
HmppResult HMPPS_Goertz_64fc(const Hmpp64fc *src, int32_t len, Hmpp64fc *res, double freq);
Parameters
Parameter |
Description |
Value Range |
Input/Output |
|---|---|---|---|
src |
Pointer to the source vector |
The value cannot be NULL. |
Input |
len |
Length of the source vector |
(0,INT_MAX] |
Input |
res |
Pointer to the output value |
The value cannot be NULL. |
Output |
freq |
Fourier transform frequency |
[0.0, 1.0) |
Input |
Return Value
- Success: HMPP_STS_NO_ERR
- Failure: An error code is returned.
Error Codes
Error Code |
Description |
|---|---|
HMPP_STS_NULL_PTR_ERR |
The value of src or res is NULL. |
HMPP_STS_SIZE_ERR |
The value of len is less than or equal to 0. |
HMPP_STS_REL_FREQ_ERR |
The value of freq is not in the range of [0.0, 1.0) |
Example
void Goertz_Example(void)
{
float src[7] = {1, 2, 3, 4, 5, 6, 7};
Hmpp32fc res;
int32_t i;
HmppResult result = HMPPS_Goertz_32f(src, 7, &res, 1.0 / 7);
printf("re = %f, im = %f\n", res.re, res.im);
}
Output:
re = -3.499998, im = 7.267825