(under subclass 125) Subject matter wherein the processing circuit generates two signals and detects an in focus condition when the two signals are essentially equal in magnitude.
(1) Note. An in-focus condition occurs when the image of the object attains a desired sharpness.
SEE OR SEARCH CLASS
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits and Systems,
63+, for an amplitude discriminator, per se, having plural inputs.
