Choi-Williams distribution function
Overview
 
Choi–Williams distribution function is one of the members of Cohen's class distribution function
Cohen's class distribution function
Bilinear time–frequency distributions, or quadratic time–frequency distributions, arise in a sub-field field of signal analysis and signal processing called time–frequency signal processing, and, in the statistical analysis of time series data...

. It was first proposed by Hyung-Ill Choi and William J. Williams in 1989. This distribution function adopts exponential kernel to suppress the cross-term. However, the kernel gain does not decrease along the axes in the ambiguity domain. Consequently, the kernel function of Choi–Williams distribution function can only filter out the cross-terms result form the components differ in both time and frequency center.
Quotations

I go through life thinking it's all going to end tomorrow.

I don't believe in self-promotion, really I can't be arsed.

I always wanted to be an actor. I had the arrogance to believe I couldn't be anything else.

As far as I'm concerned, I want to be nowhere else. It's difficult in film because everybody wants to make a safe bet with roles. But if you are going to do stuff then you should be getting strong reactions. I don't want audiences to be going, "Yeah, that's all right."

It's something else. I'm speechless. I've just got to step up to the plate and deal with it. I had a confidence about it but then that's because of the people around me who made me feel good about it. I knew positively on Monday. I was in Baltimore when I took the call. My first reaction was I needed a drink.

I hate handguns. Handguns are used to shoot people and as long as they are around, people will shoot each other. That's a simple fact. I've seen a bullet wound and it was a mess. It was on a shoot and it scared me. Bullets have a nasty habit of finding their target and that's what's scary about them.

If I went onto the Internet and started looking at what some people were saying about me - which, sadly, I have done - it would drive me insane.

Interview with Entertainment Weekly magazine.

 
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