Arithmetic encoding (bookmark)

Based on the previous post, I can't stop until I implement my own arithmetic coding. The worse is I don't have my laptop with me, therefore I only have read articles and tried encoding/decoding on the paper. Which is slightly harder if numbers used are fixed point and want to imitate how C program should work. These 3 pages helped me most to understand the problem.

Arithmetic Code [michael.dipperstein.com]
Basic arithmetic coding [arturocampos.com]
Arithmetic coding how to [pdf] [webspace.ulbsibiu.ro/macarie.breazu]

Impulse and unit step responses

I posted yesterday post about IIR filters but totally missed the topic which I should have started with. It's about systems responses. I had finally some time to document filters we use in code.

The Unit Step Response [lpsa.swarthmore.edu]
Link directs to the unit step response. There's tab also with the impulse response. All explained with introduction and equations followed by pictures.
Website's name is Linear Physical System Analysis. Recommended to read !

Digital filters

I've been wondering always how to implement filter in C language. There was a time when I just copied one IIR filter and tuned it to my needs but did not bother with discovering more about it and implement my own one. This springs back when I have to test a part where are few filters applied.

I have started with IIR and low pass filters.

Fixed Point Scaling [rowetel.com/blog]
This one explains simple low pass filter and provides octave file which helps me really weLL.  I will come back with octave topics later.
What is moving avarage filter? [dsprelated.com]
DSPrelated is the one which I visit when I look for digital signal processing. Articles, forum with many experienced users.
Introduction to Digital Filters [rw4.cs.uni-sb.de/~kaestner]

Low pass filter [helpful.knobs-dials.com]
This is moving avarage filter with code. Simple which enables reader to understand it quickly.

Algorithms with bits

 I was playing with code for a decoder today and had to find an algorithm to calculate all bits set in the short integer and find also first bit set (lowest) and last bit set (highest). Certainly simple task with these sites to start with.

Bit Twiddling Hacks [graphics.stanford.edu]
 There are posted many different algorithms which you can choose which suits you.

Aggregate Magic Algorithms [aggregate.org/MAGIC/]
Less, but also useful.

KEIL - Counting set bits in byte [keil.com/support]
Nothing new to mention but it's short in context.

More sources [aggregate.org/MAGIC]
More links for reading found on aggregate magic algorithms.