# Creating Flange or Variable Delay DSP model

1. Mar 5, 2012

### Evo8

1. The problem statement, all variables and given/known data

Im trying to model this in simulink. Im having a little trouble getting things to work. I need to create a variable delay model or basically implement a "flanger" effect.

Flange
A flange is an audio effect, which is achieved by combining two identical signals with each other; the original and delayed signal by a gradually changing amount. The difference equation for the flange effect is given by:
$$x(n)a*[x(n)+x(n-d(n))]$$

Where the time varying delay is given by
$$d(n)=D+\frac{D}{2}[1-sin(\frac{2 \pi f_{d} n}{f_{s}})]$$

Where
- D is a fixed delay,
- fd is the flanging frequency

2. Relevant equations

N/A

3. The attempt at a solution

So this is what I have right now.

The parameters of the Variable fractional delay block are here:

Im basically trying to mimic that equation with math operators. Im told that it should do the trick. However it doesn't. Im not sure where im going wrong. Any hints or tips would be greatly appreciated!

Thank you,

E

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2. Mar 7, 2012

### I like Serena

I do not have much experience with simulink, but it seems to me that your model should work.

What does it do now?
Or what exactly doesn't it do?