Flanging effect in Digital Audio

Question

If I have a sine wave of following properties

amplitude = 0.8
Sample Rate= 44100
Frequency = 440 Hz
Time = 2 sec

which can be written as

x(t) = 0.8*sin(2*Pi*440*t/(44100*2)) //where t is the 't'th sample in 44100*2 samples. 

How can we produce Flanging Effect over this sine wave? Can we add a phase shifted wave of the same wave to produce the effect?

Answer 1

According to Wikipedia: Flanging, you do just that (to get the purest version of a flanger): add a shifted version, i.e.

y(t) = x(t) + x(t - N)

where N would be chosen to be less or equal to a 20 ms shift, so up to 882 samples for a sampling frequency of 44.1 kHz.