Averaging method for periodic strays elimination and a counting

Details Averaging method for periodic strays elimination and a counting Averaging method for periodic strays elimination and a counting

1984-02-07

1987-05-12

Gruber, Felix D.

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364574, 364417, 128731, G06G 712, A61B 504, G06F 1542

Patent

active

046654992

ABSTRACT:
An averaging method for elimination of periodic stray signals, such as stray signals originating ain an environment (2) comprising a main signal source, which method is employed in a system for measuring evoked responses during an averaging procedure run in an averaging computer (7) which processes a set of signals picked up from an examined subject (10), e.g. a human scalp, by means of electrodes (11) which set of signals is fed through an instrumentat ion amplifier (9) to an averaging computer (7). A counting circuit in the system for measuring evoked responses comprises a sensing circuit (1), a circuit (3) detecting signal half-periods, a counting circuit (5) and a triggering circuit (6), and introduces permanent desynchronization between the frequency 1/T of external stimuli signals, e.g. from a photostimulator (8), and the sweeps of the averaging procedure in the averaging computer (7) both in relation to the frequency 1/T of the periodic stray signals resulting in amplitudes of the stray signals being substantially completely eliminated.

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