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**
Efficient algorithm to compute a DFT for an arbitrary set of frequencies**I developed
this specific algorithm for one of my projects. Similar to "Goertzels Algorithm" it should be used to compute the DFT of a small, limited number of frequencies rather than the whole spectra.

**
Direct synthesis of an arbitrary waveform signal**
The principle described provides an easy way to design an arbitrary digital waveform generator
that can be used up to very high frequencies with comparably low noise generation. For certain
applications it provides a good alternative to the standard DDS-approach.

Arbitrary_signal_generator.pdf

**
Number puzzle**
"Number" is an entertaining by-product of one of my DSP-projects. It was written in MS-EXCEL VBA
(sorry, I've yet to find the time to transfer it into some decent programming language ;-) The
underlying idea is to generate what is known as a "Magic Square" based on variations of a single
numerical sequences. In DSP-language the result of those variations is a multitude of different
spectra, all having the same power. Once the algorithm has been unveiled, filling the square
becomes very easy.

Have fun!