Signal original form to a waveform expressed as a current ("I") or a voltage ("V"), or an electromagnetic waveform, for example, an optical signal or radio transmission. Once expressed as an electronic signal, the signal is available for further processing by electrical devices such as electronic amplifiers and electronic filters, and can be transmitted to a remote location by electronic transmitters and received using electronic receivers. In Electrical engineering programs, a class and field of study known as "signals and systems" (S and S) is often seen as the "cut class" for EE careers, and is dreaded by some students as
Electronic drum module special-purpose electronic device which accepts input from the drummer via external triggers that are hit with regular drum sticks. With an electronic drum kit, the player hits triggering devices as a synthesizer player would strike the keys of the synthesizer keyboard. Triggers may be pads or cymbal-shaped devices or piezo-electric pick-ups similar in function to a guitar pick-up. When the triggers are struck or activated by the vibration of a drum or other instrument, the electronic drum module interprets the signal and outputs the specific voice assigned to that trigger. The sound (or "voice") may be a sample or synthesized