The input can be an analog signal or a digital signal. Every time the output signal reaches one of the limits, the PWM signal… … Wikipediaĭifferential pulse-code modulation - (DPCM) is a signal encoder that uses the baseline of pulse code modulation (PCM) but adds some functionalities based on the prediction of the samples of the signal. These limits correspond to the reference signal (red), offset by a given value. The output signal (blue) is compared with the limits (green). Delta modulation - Principle of the delta PWM.
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