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ece45-project/fade_in.m
SeaSponge a7af33ba25
Created 3 new functions, see in description
Created functions bandreject_filter(), fade_in(), and fade_out(). Should be in the standards asked, but if not please contact me
2021-12-08 14:50:40 -08:00

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928 B
Matlab

function output = fade_in(input, time)
% Creates a fade-in sound effect that lasts a given
% time parameter of the input sound signal
% By Yalu Ouyang
% input: a 1D array that represents the sound signal in the time domain
% time: how long the fade in effect should last
% Shouldn't be longer than the input signal (in which case the function
% treats it as the duration of the signal)
% Returns modified signal in the time domain (output).
len = length(input);
% if time parameter longer than signal, treat time as
% the duration of original signal
if time > len
time = len
end
% set multiplier as 1D array
% fade in effect: from no volume to full volume of signal
multiplier = (1 : time) / time;
% the resulting fade-in output
output = input .* multiplier;
end
% This is useful for making videos, specifically the intro part