METHODS AND APPARATUS TO MONITOR HAPTIC VIBRATIONS OF TOUCHSCREENS

Methods and apparatus to identify haptic vibrations of touchscreens are disclosed. Example apparatus disclosed herein include means for generating a haptic control signal that is to cause vibrations of a haptic display means, the vibrations to simulate a texture corresponding to visual subject matter to be displayed on the haptic display means, the vibrations of the haptic display means to produce an acoustically detectable signal. Disclosed example apparatus also include means for encoding a watermark into the haptic control signal to generate a watermarked haptic control signal, the watermark including identification information to identify at least one of the subject matter or the texture, the watermark to modify the acoustically detectable signal.