Abstract: Since the prior-art is based upon analog circuitry, it uses sinusoidal frequency and/or amplitude modulation to simulate a rotating speaker at a reasonable cost. This invention uses a process based upon theoretically derived frequency modulation (FM) and experimentally measured amplitude modulation (AM) to simulate the rotating speaker. The main FM equation is based upon the Doppler effect and is equal to one over one plus a sinusoidal velocity coefficient. The main AM equation has a much narrower peak than sinusoidal modulation. This invention also contains several novel methods to control the angular velocity of the speakers, including changing the horn's speed dependent upon the original audio, modeling the speaker's acceleration to allow the physically realistic transitions between angular velocities, and adding noise to simulate natural variations in rotation. The digital apparatus that implements this invented process includes a digital processor and memory.

Abstract: Combination of a message board and computer equipment for conveniently writing and/or maintaining notes while working on or near a computer. The message board can be written and rewritten upon, used to post paper notes or photographs, or both. The message board is attached to the perimeter or side of the computer monitor or case, or used in conjunction with the keyboard or mouse. The message board can be made of traditional materials, or erasable and malleable metals or plastics, such as acrylic.