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In Telecommunication and Electronics , the term duty cycle has the following meanings: Duty cycle is the proportion of time during which a component, device, or system is operated. Suppose a disk drive operates for 1 second, then is shut off for 99 seconds, then is run for 1 second again, and so on. The drive runs for one out of 100 seconds, or 1/100 of the time, and its duty cycle is therefore 1/100, or 1 percent. In a periodic phenomenon, the ratio of the duration of the phenomenon in a given period to the period. :duty cycle where D : is the duration that the function is non-zero; : is the period of the function. For example, in an ideal Pulse Train (one having rectangular pulses), the duty cycle is the Pulse Duration divided by the Pulse Period . For a pulse train in which the pulse duration is 1 μs and the pulse period is 4 μs, the duty cycle is 0.25. The duty cycle of a Square Wave is 0.5, or 50%. For another example, the duty cycle for a piece of electrical equipment (such as an electric motor) is the period for which it may be operated without deleterious effects, such as from overheating. In a Continuously Variable Slope Delta (CVSD) Modulation converter, the mean proportion of Binary "1" digits at the converter Output in which each "1" indicates a Run of a specified number of consecutive bits of the same polarity in the Digital output Signal . Some music Synthesizers vary the duty cycle of their audio-frequency oscillators to obtain a subtle effect on the Tone Colors . This technique is known as Pulse-width Modulation (PWM.) |
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