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This work will present a digital system that allows an on-line experimental determination of the instantaneous torque of either motoring or braking machines. With the procedure developed the machine under test accelerates or decelerates a rigid inertia and all that is required to obtain the instantaneous torque is the instantaneous angular speed signal. An additional external braking or motoring machine, like a dynamometer, is not strictly required, but can add certain value to the testing capabilities. The amount of the total inertia under motion can be determined as part of the actual process with this method. Digital time invariant linear filters are used to process the speed signal using a conventional high level language code running in a microcomputer. The non recursive filters were designed to obtain a short convolution time with a small memory penalty and to handle a noisy speed signal.