Electronic musical instrument Electronic musical instrument An electronic musical instrument is a musical instrument that produces sound using electronic circuitry. Such an instrument sounds by outputting an electrical, electronic or digital audio signal that ultimately is plugged into a power amplifier which drives a loudspeaker, creating the sound heard by the performer and listener. An electronic instrument might include a user interface for controlling its sound, often by adjusting the pitch, frequency, or duration of each note. A common user interface is the musical keyboard, which functions similarly to the keyboard on an acoustic piano, except that with an electronic keyboard, the keyboard
Instrument error five-pound weight could be measured on a scale and then the difference between five pounds and the measured weight could be the accuracy. The second definition makes accuracy related to calibration, while the first definition does not. The instrument error is not like random error, that can't be removed. Sometimes the removal of instrument errors are very easy, but it is case dependent. In Engineering instruments, like voltmeter or ammeter for example, the instrument error is very difficult to remove. Ammeter has built in resistance, which can't be removed either way. So the only way is to minimize it. On