Abstract: A musical instrument tuning and intonation aid employs a novel concept and method, which closely approximates a desirable mechanical stroboscopic effect—but without mechanical moving parts. A suitable image pattern is displayed on an electronically controlled, visual display screen of any available type (Liquid Crystal Display, Organic LED Display, Electro-Luminescent Display, Cathode Ray Tube display, etc.) in direct and immediate response to the detection of a unique phase of the fundamental pitch periods in arbitrary acoustic or electrical signals. The displaced position of the pattern at these instants is determined by a pre-calculated reference frequency.

Abstract: A musical instrument tuning and intonation aid employs a novel concept and method, which closely approximates a desirable mechanical stroboscopic effect—but without mechanical moving parts. A suitable image pattern is displayed on an electronically controlled, visual display screen of any available type (Liquid Crystal Display, Organic LED Display, Electro-Luminescent Display, Cathode Ray Tube display, etc.) in direct and immediate response to the detection of a unique phase of the fundamental pitch periods in arbitrary acoustic or electrical signals. The displaced position of the pattern at these instants is determined by a pre-calculated reference frequency.

Abstract: An electronic controller for a therapeutic table with a shaft encoder for sensing the angular position of a movably mounted patient support and means for controlling the movement in accordance with a comparison between the sensed angular position and an angular limit reference. The left and right preselected tilt angles are alternately automatically selected as the reference. Fault conditions, such as a jam condition, occurs when the drive mechanism to briefly reverse to automatically correct the condition prior to power termination. In the event of excessive tilt, actuation of limit switches results in reversal and movement of the patient support to a horizontal position before power termination. The jam condition is sensed by a strain gauge for detecting the work required for movement of the patient support and comparing it to a preselected work reference. In the event of drive clutch disengagement, power to the motor is terminated.