Owl_signal
Signal: Fundamental Signal Processing functions.
Basic window functions
val blackman : int -> Owl_dense.Ndarray.D.arr
Blackman window is a taper formed by using the first three terms of a summation of cosines. It was designed to have close to the minimal leakage possible. blackman m
returns a blackman window.
val hamming : int -> Owl_dense.Ndarray.D.arr
Hamming window is a taper formed by using a raised cosine with non-zero endpoints, optimized to minimize the nearest side lobe. hamming m
returns a hamming window.
val hann : int -> Owl_dense.Ndarray.D.arr
Hann window is a taper formed by using a raised cosine or sine-squared with ends that touch zero. hann m
returns a hann window.
Filter response function
val freqz :
?n:int ->
?whole:bool ->
float array ->
float array ->
Owl_dense.Ndarray.D.arr * Owl_dense.Ndarray.Z.arr
freqz computes the frequency response of a digital filter.
freqz b a
computes the frequency response of digital filter with numerator filter coeffecient given by b
(float array) while the denominator filter coeffecient given by a
(float array), and returns the frequencies and the frequency response respectively in real and complex ndarrays. Two optional parameters may be specified: n
is an integer that determines the number of frequencies where the frequency response is to be evaluated, and whole
is a boolean that decides whether the frequency response is two-sided or one-sided. Default values of n
and whole
are 512 and false.