VLC Pitch Control or accelerated playback?

Question

I have a signal and I have a filter.

I want to convert the signal into frequency domain and then filter it with my filter.

Converting the signal into frequency domain is easy, but how do I filter the signal now?

This is my filter:

filter_2 = firceqrip(2,0.6,[0.05 0.03]);

This is my signal:

freqs = [0.08, 0.2, 0.32, 0.4];
periods = 1./ freqs;
t_max = 4 * periods(1);
t = linspace(0, t_max, 50);

signal = sin(2*pi*0.08*t) + sin(2*pi*0.2*t) + sin(2*pi*0.32*t) + sin(2*pi*0.4*t);

% to find the fft of the signal
N = 64;
signal_spect = abs (fft(signal,N));
signal_spect = fftshift(signal_spect);
F = [-N/2:N/2-1]/N;

now how do I filter the previous signal with my filter? I tried doing this fft(filter_2) but it didn't work out, it's probably a wrong approach, but I do not know what else to do

any help is appreicated

Solution 1

There's two methods.

You can go to the menu bar and go to: Playback > Faster or Slower

Also on the actual player there is a way to alter the speed, there should be a box showing 1.00x clicking this will allow you to drag a slider to change play speed.

Solution 2

I prefer to use the hotkeys + and - to adjust the playback speed (±0.5/1.0x). There’s also [ and ] to adjust the speed using finer increments (0.1x), and = to reset the speed to 1.0x.

(I used to predominantly use WMP as my media player. I liked that VLC had the ability to adjust the speed of playback, but it also changed the pitch which made it useless. MPC has the ability to adjust the speed, but it’s limited. Gom is actually pretty good too; it can adjust the speed by 0.1x and doesn’t mess the pitch. But, when VLC changed it to leave the pitch alone, I permanently switched all my video playback to VLC because it allows me to get through things faster. I now watch pretty much everything at between 1.2-1.7x of normal speed, whether it’s a movie or show or whether it’s something I like or hate. In my opinion, this function of VLC is the greatest thing to happen to computers since flying, toasted, sliced bread!)

Solution 3

Yes, down on the status bar along the bottom, towards the right you will see a 1.00x in a box. Click that and a drop down will show with a slider. Move the slider up and down to select the speed you want.

At the bottom of the slider it displays the current speed. Click that indicator to reset to 1.00x again

Comments

[mehmet]

Are you allowed to change the "2" in the firceqrip() function to another value?

[HappyBee]

@mehmet will it make a difference?? i should use a filter of order 2, that's why :/

[Jim McKeeth]

The two methods have the same effect.

[Sandeep Bansal]

Yes but I'm just discussing all possible options available

[HappyBee]

but i can't have a filter with the order 63, my filter is of order 2, I am really confused.

[mehmet]

@sadbee I' ve edited my answer above. The result of filtering change a little. Check this out, maybe it makes more sense..