firhilbf

Finite impulse response (FIR) Hilbert transform

Public Functions

firhilbf	firhilbf_create(unsigned int _m, float _as)
firhilbf	firhilbf_copy(firhilbf _q)
int	firhilbf_destroy(firhilbf _q)
int	firhilbf_print(firhilbf _q)
int	firhilbf_reset(firhilbf _q)
int	firhilbf_r2c_execute(firhilbf _q, float _x, float complex * _y)
int	firhilbf_c2r_execute(firhilbf _q, float complex _x, float * _y0, float * _y1)
int	firhilbf_decim_execute(firhilbf _q, float * _x, float complex * _y)
int	firhilbf_decim_execute_block(firhilbf _q, float * _x, unsigned int _n, float complex * _y)
int	firhilbf_interp_execute(firhilbf _q, float complex _x, float * _y)
int	firhilbf_interp_execute_block(firhilbf _q, float complex * _x, unsigned int _n, float * _y)

Interfaces

firhilbf firhilbf_create(unsigned int _m, float _as)∞

Create a firhilb object with a particular filter semi-length and desired stop-band attenuation. Internally the object designs a half-band filter based on applying a Kaiser-Bessel window to a sinc function to guarantee zeros at all off-center odd indexed samples.

• _m : filter semi-length, delay is \( 2 m + 1 \)
• _as : filter stop-band attenuation [dB]

firhilbf firhilbf_copy(firhilbf _q)∞

Copy object including all internal objects and state

int firhilbf_destroy(firhilbf _q)∞

Destroy finite impulse response Hilbert transform, freeing all internally-allocted memory and objects.

int firhilbf_print(firhilbf _q)∞

Print firhilb object internals to stdout

int firhilbf_reset(firhilbf _q)∞

Reset firhilb object internal state

int firhilbf_r2c_execute(firhilbf _q, float _x, float complex * _y)∞

Execute Hilbert transform (real to complex)

• _q : Hilbert transform object
• _x : real-valued input sample
• _y : complex-valued output sample

int firhilbf_c2r_execute(firhilbf _q, float complex _x, float * _y0, float * _y1)∞

Execute Hilbert transform (complex to real)

• _q : Hilbert transform object
• _x : complex-valued input sample
• _y0 : real-valued output sample, lower side-band retained
• _y1 : real-valued output sample, upper side-band retained

int firhilbf_decim_execute(firhilbf _q, float * _x, float complex * _y)∞

Execute Hilbert transform decimator (real to complex)

• _q : Hilbert transform object
• _x : real-valued input array, shape: (2, 1)
• _y : complex-valued output sample

int firhilbf_decim_execute_block(firhilbf _q, float * _x, unsigned int _n, float complex * _y)∞

Execute Hilbert transform decimator (real to complex) on a block of samples

• _q : Hilbert transform object
• _x : real-valued input array, shape: (2*_n, 1)
• _n : number of output samples
• _y : complex-valued output array, shape: (_n, 1)

int firhilbf_interp_execute(firhilbf _q, float complex _x, float * _y)∞

Execute Hilbert transform interpolator (real to complex)

• _q : Hilbert transform object
• _x : complex-valued input sample
• _y : real-valued output array, shape: (2, 1)

int firhilbf_interp_execute_block(firhilbf _q, float complex * _x, unsigned int _n, float * _y)∞

Execute Hilbert transform interpolator (complex to real) on a block of samples

• _q : Hilbert transform object
• _x : complex-valued input array, shape: (_n, 1)
• _n : number of *input* samples
• _y : real-valued output array, shape: (2*_n, 1)