Mirror/aicodix___dsp
1
0
Fork 0
mirror of https://github.com/aicodix/dsp.git synced 2026-04-27 14:30:36 +00:00
Code Issues Projects Releases Packages Wiki Activity

added Blackman window

Browse source
This commit is contained in:
Ahmet Inan 2018-03-04 09:14:13 +01:00
commit 24594f93bb
2 changed files with 18 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

1
README.md
View file

@ -17,6 +17,7 @@ Implemented are the follwing [Window functions](https://en.wikipedia.org/wiki/Wi
* [Hann window](https://en.wikipedia.org/wiki/Window_function#Hann_window)
* [Hamming window](https://en.wikipedia.org/wiki/Window_function#Hamming_window)
* [Lanczos window](https://en.wikipedia.org/wiki/Window_function#Lanczos_window)
* [Blackman window](https://en.wikipedia.org/wiki/Window_function#Blackman_window)
* [Gaussian window](https://en.wikipedia.org/wiki/Window_function#Gaussian_window)
* [Kaiser window](https://en.wikipedia.org/wiki/Window_function#Kaiser_window)

17
window.hh
View file

@ -72,6 +72,23 @@ public:
inline operator const TYPE * () const { return w; }
};
template <int TAPS, typename TYPE>
class Blackman
{
TYPE w[TAPS];
public:
Blackman(TYPE a0, TYPE a1, TYPE a2)
{
for (int n = 0; n < TAPS; ++n)
w[n] = a0 - a1 * std::cos(Const<TYPE>::TwoPi() * TYPE(n) / TYPE(TAPS - 1)) + a2 * std::cos(Const<TYPE>::FourPi() * TYPE(n) / TYPE(TAPS - 1));
}
Blackman(TYPE a) : Blackman((TYPE(1) - a) / TYPE(2), TYPE(0.5), a / TYPE(2)) {}
// "exact Blackman"
Blackman() : Blackman(TYPE(7938) / TYPE(18608), TYPE(9240) / TYPE(18608), TYPE(1430) / TYPE(18608)) {}
inline TYPE operator () (int n) { return n >= 0 && n < TAPS ? w[n] : 0; }
inline operator const TYPE * () const { return w; }
};
template <int TAPS, typename TYPE>
class Gauss
{