Monday, January 21, 2008

Noise - Switching worlds

From now on the simplicity associated with Noise will be gone for ever for me ;( .Now Noise has to be AGW.

Till now noise was just some random signal and ways to deal with could have been equally random (with finite mean and non causal, time dependent variance) ;) .
Samples in the past have varied from plugging cotton into ears ,banging the neighbor's door and threatening him with dire consequences , to , orienting the bed in such position that one gets the least amount of noise(though it left no room for me to walk in my room !) and trying to increase the frequency of (mechanical) sound waves so that they don't remain in the audible range.

Though the most effective method has been to get accustomed to it.(If you can't do away with it, then learn to live with it).Fortunately I had a wealth of test cases -Voice of a teacher has a couple of properties similar to noise.

It is completely unintelligible.
You don't 'want' to listen to it but end up doing so.

So, putting to good use the 8 to 5 schedule of our college, I finally managed to perfect the technique to be able to fall asleep amidst any amount of noise.

You see, noise was once so tamable, so simple.

But engineers are fond of taking the simplest of things and doing a threadbare analysis such that at the end of it, it remains 'interesting' only for the modeling complexity it presents. So today it was noise's turn to switch worlds- from the simple to the cryptic.

Now noise has a flat power density spectrum. Now it distributed in a Gaussian(in this link read the stuff written about Laplace) fashion. Now it is 'white'. Now it has something to do with the bandwidth of the device. Now it needs careful impedance matching to recognize its presence.

I tried my best not to fall for the temptation of listening to BR when he was dealing with modeling of noise. But as everyone in the elec department knows, you just can't NOT listen when BR is in full flow. He sometimes reminds me of Sachin in Sarjah.If he is in mood and gets set, then you are in for a treat.

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Ankit Ashok said...

Commit all your crimes when Sachin is batting / BR is teaching, They will go unnoticed because even the Lord is watching.

Anonymous said...

I recently came accross your blog and have been reading along. I thought I would leave my first comment. I dont know what to say except that I have enjoyed reading. Nice blog. I will keep visiting this blog very often.


Ankit Ashok said...

thank you

And you are welcome!