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<p>An approach to signal acquisition, digitization, and processing of low-frequency physiological signals is discussed. The approach uses a chip attached to a transducer through a digital wire placed at the sensing point. The wire transmits digital information instead of an analog signal to an application-specific integrated circuit (ASIC) signal processor. This digital wire/Visp chip set produces a noise-immune signal processing system usable in a variety of biosignal processing needs. The concept is demonstrated using the Visually Evoked Potential (VEP) measurement system.</p>

H. N. Kothari, P. A. Patel and J. F. Robb, "Development of an ASIC Set for Signal Processing," in IEEE Micro, vol. 12, no. , pp. 24-33, 1992.
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