Features

Filter parameters are inside an ordered set of three constants with values corresponding to amplitudes, center frequencies and decay time parameters. A ``filter state'' can contain one or more ordered sets. These values are used in the filter for a single pass in the whole state and their output signal is added to an accumulator for the total output signal which is the addition of the outputs of all passes in each ordered set. Therefore each pass corresponds to a simple filter and the whole structure is the sum of each output and can be seen as a set of filters connected in parallel.

Filter states give a musical quality to this system since each state contains ordered sets of frequencies and amplitudes. An input signal can be harmonized by the frequencies of pitches defiened in the state. This quality might give a great variety creative options in a compositional sense. An input source of a wideband noise can be filtered to obtain a pitched sound similar to fine tunning percussion sounds like cymbals or timpani. In the same way a pitched sound can be transposed to one or more of its harmonic components instead of its fundamental frequency.

The lisp implementation of Max Matthews original real time implemantation in C, renders a sound in non real-time. One advantage is that more sets of frequencies in a state filter can be used. The other feature is that it can be used as a stand alone CLM intrument or as a filter for another CLM instrument. This gives the option of the filter of being modular and the ability of enhancing it in various ways such as adding delays and reverbaration and spatial effects.