Signal stabilizing circuits

Abstract

Abstract This specification discloses signal processing circuits of the type suitable for use in removing unwanted cyclic and/or random components from a d.c. signal such as signals of the type produced by load transducers in weighing systems. In the preferred forms, the processing circuit comprises means for determining the period of oscillation of the composite signal, means for integrating the composite signal over one period of the composite signal, and means for dividing the integrated composite signal by the period thereof to produce the average of the composite signal over one period. Several forms of circuit including such means are disclosed including one comprising a low pass filter interposed between the signal source and the phase locked loop, a voltage to frequency converter connected to the output of the filter and having its output connected to a digital integrator circuit controlled by the phase locked loop to integrate the signal over one period, a digital divider circuit connected to the output of the integrator and a time-base integrator connected to the divider and controlled by the phase locked loop to divide the integrator output by the period of the signal to produce a digital average signal, and a digital to analogue converter for converting the digital average signal to analogue form.

Inventors

• 👤 Edward Morris Howells
• 👤 Cheung Yun Chan

Bibliographic Details