Can anyone tell me which filter i can use to reduce the magnitude/amplitude of a signal ? please help

i have a plot of magnitude of signal.. i want the output of a filter to be the same signal but with reduced amplitude..

Answer 1

[Star Strider]

I would just multiply the entire signal by some constant ‘K’ less than 1:

out = median(signal) + (signal-median(signal))*K;

Example:

t = linspace(0, 2*pi);
signal = pi + sin(t) + 0.2*randn(size(t));

K = 0.7;
out = median(signal) + (signal-median(signal))*K;

figure(1)
plot(t, signal,  t, out)
grid

[L K]

yes it does reduce ,thank you for the answer, but if i reduce the amplitude will the corresponding phase also reduce ?

[Star Strider]

My pleasure.

This reduces the amplitude only. The phase should remain the same.

[L K]

So Do u know any way in which i reduce phase? SHould i attach the image so u can tell me clearly? I have attached the image,in that i want reduce the angle tita,please can you help me this?

[Star Strider]

The obvious answer is to reduce ‘V_Q’. If you are doing electrical power calculations, you would need to add capacitance in series or parallel, since the figure demonstrated a positive phase angle, indicating an inductive load.

With that I have essentially exhausted my knowledge of power engineering, so I will leave you to it. Please discuss this with your professor.

[L K]

ok,thank u

[Star Strider]

My pleasure.