An on-line digital integrator for physiological data.

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Abstract
Long-term on-line integration of physiological data utilizing conventional analog integrator circuitry is of limited feasibility due to both theoretical and economic considerations of integrating coefficients, noise, and drift In order to meet a requirement for integration periods of 20 min. duration, a digital circuit was developed which permits decreasing the integration coefficient by multiplying it by the ratio of 2 additional capacitors in the circuit Digital integration occurs as input signals are transformed by a linear voltage to pulse frequency conversion into a series of pulses which are, in turn, collected through a linear transistor pump. Several advantages were obtained by this approach to on-line integration, including much longer integration times than are normally feasible, excellent signal to noise/drift characteristics, and linearity andrepeatability as well as stability and low cost.

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