# Digital filter projects

1. ## Digital filter projects

Any possible research study that can be done on digital filters?

Initially, I was thinking about a study on analog filters, but I won't be able to implement them and would also require knowledge of AMS. Still, project ideas on analog design are welcomed.

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2. ## Re: Digital filter projects

Digital filters... Do you mean the type performed by Fourier transformations?

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3. ## Re: Digital filter projects

Digital filters are based on FFT(Fast Fourier Transform)
Mainly 2 types of digital filters are there
FIR(Finite Impulse Response)
IIR(Infinite ...........)

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4. ## Re: Digital filter projects

Hi,

Digital filters are based on FFT(Fast Fourier Transform)
Mainly 2 types of digital filters are there
FIR(Finite Impulse Response)
IIR(Infinite ...........)
I agree that all follow the same rules and may be explained with Fourier...
But some digital filter topologies are similar to analog filters, like a "biquad" for example.

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But "digital filter" is a very brad range. They may be linear, nonlinear, variable order and filter characteristic, but they may also be two dimensional (for pictures) or even higher dimension.
There are "digital filters" able to recognize veins in pictures made by ultrasonic or other tools, and are able to show a 3D model on the PC screen.

It's a very huge range..

Klaus

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5. ## Re: Digital filter projects

something for beginners, I only have an undergrad level of understanding about digital filters.
I want to go step by step, hence something that is not too advanced.

6. ## Re: Digital filter projects

Analog filters are very easy to study in free simulation tools such as LTSpice.

My suggestion would be to study both: Build and simulate an analog RC filter (single order low pass) and then build and simulate the same filter digitally (first order IIR). And grow from there.

PSIM is an ideal tool for doing this. Matlab/simulink as well.

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7. ## Re: Digital filter projects

I mostly wanted to learn HDL through filters, anyways do you have any other ideas for a research project, which uses HDL. I am open to learning both HDL and AMS-HDL and have around 6 to 7 months on my hand.

8. ## Re: Digital filter projects

I mostly wanted to learn HDL through filters, anyways do you have any other ideas for a research project, which uses HDL.
Won't recommend that.
On one side you need to tackle with HDL coding tips n tricks and on the other side you can be easily overwhelmed with the growing complexity of filters.

You can start learning HDL by starting with simple things such as counters, moving on to writing and reading to/from FIFOs, etc.

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