Compagnie Generale D'electricite

Jean-Francois Quiniou

Alain R Le Mehaute

Claude Roques-Carmes

Dalloul Wehbi

Antoine Derossis

A signal generator generates a temporal signal with a periodic configuration defined by an arrangement of seed patterns resulting from a branching construction iteratively using laws for composing several patterns and consisting in defining the periodic configuration of the signal as a component 'a.sub.n ' of the nth term Un with several components (a.sub.n, b.sub.n) of a recurrent sequence defined at the level of each of its components by a specific recurrent composition law, the initial term U0 having for its components the seed patterns (a.sub.0, b.sub.0). The temporal signals known as 'fractal' signals result from a branching construction of this kind. The generator comprises a microprocessor (10) associated with a keyboard-display system (11), a read-only memory (12) for programs, a random access memory (13) and an output digital-to-analog converter (14). When creating a signal periodic configuration pattern its working memory contains at least three files: a current patterns file, a previous patterns file and an old patterns file, the current patterns being constructed from arrangements of old patterns in which the seed patterns have been replaced by the preceding patterns.

Fractal-type periodic temporal signal generator

The temporal signal generated has a periodic configuration defined by an arrangement of seed patterns resulting from a branching construction employing n successive applications of m pattern type laws each defined by a specific arrangement of p pattern types. This construction amounts to defining a periodic signal configuration as a component 'an' of the nth term Un with several components (an, bn) of a recurrent sequence defined at the level of its components by a particular recurrent composition law, the initial term UO having for its components the seed patterns (aO, bO). The temporal signals known by the name 'fractal' result from a branching construction of this kind. The generator comprises an elementary signal forms generator circuit (20) corresponding to the definitions of the seed patterns, an m-digit counter (30) to base p incremented when each elementary signal form is delivered by the elementary forms generator circuit (20) and a pattern type selector circuit (40) controlled by the counter (30) to base p and controlling the elementary forms generator circuit (20).

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Besancon, France

Jean-Francois Quiniou