44 lines
1.3 KiB
Matlab
44 lines
1.3 KiB
Matlab
function output = flanger(input, time_delay, osc_freq, amp, Fs)
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% DOCUMENTATION:
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% FLANGER combines a single oscillating delayed signal with the original signal
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% Interference between original and delayed signals create "flanging" effect
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% Rocommedned delay time: 0-15 ms
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% Recommended oscilating fequency: 0.1 - 5 Hz
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% input: 1D array containing audio signal
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% time_delay: maxinum value of the oscillating signal
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% osc_freq: frequence of oscillation
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% amp: amplitude of output signal
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% fs: sampling frequency
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% CONTRIBUTORS:
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% Lance Zhu: Function Author
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% SOURCES:
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% Code inspired by information provided in:
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% https://users.cs.cf.ac.uk/Dave.Marshall/CM0268/PDF/10_CM0268_Audio_FX.pdf
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% create index array
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len=length(input);
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index=1:len;
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% create reference wave to create oscillation
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% taking only absoluted value for the reference wave
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osc_wave = abs(sin(2*pi*index*(osc_freq/Fs)));
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% convert delay in time to delay in samples
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sample_delay=round(time_delay*Fs);
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% create empty output array
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output = zeros(len,1);
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% Generating delay for each sample from reference oscillation wave
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% start loop at sample_delay to make sure delayed sample is from t>=0
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for i=sample_delay:len
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% i_delay: delay for current sample
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i_delay=round(osc_wave(i)*sample_delay);
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% combine delayed sample with original sample
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output(i) = (amp*input(i))+amp*(input(i-i_delay));
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end |