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The usual interpretation of noise is represented by a sum of many independenttwo-level elementary random signals with a distribution of relaxation times. Inthis paper it is demonstrated that also the superposition of many similarsingle-sided two-level signals, with the same relaxation time, produces noise.This is possible tanks to the coincidences among the signals which introducecross-correlations and tune locally the resulting process in trains ofpseudo-periodic pulses. Computer simulations demonstrate the reliability ofthis model, which permits to insert in an coherent framework other modelssolving problems still open.

Pseudo-periodicity and 1/f noise from the sum of similar intermittent signals