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PWM (Pulse Width Modulation) and PAM (Pulse Amplitude Modulation) are two different modulation techniques used in signal processing. Here are the key differences between them: 1. **Modulation Method**: - PWM modulates the width of the pulses in a signal to represent the information. The amplitude remains constant while the width of the pulse changes. - PAM modulates the amplitude of the pulses to convey information. The width of the pulses remains constant while the amplitude varies. 2. **Signal Representation**: - In PWM, the information is represented by the duration of the high state of the pulse. A longer pulse width indicates a higher value of the signal. - In PAM, the information is represented by the height of the pulse. A higher amplitude indicates a higher value of the signal. 3. **Applications**: - PWM is commonly used in applications such as motor control, light dimming, and audio signal processing. - PAM is often used in digital communication systems, such as in pulse code modulation (PCM) and in some types of data transmission. 4. **Noise Immunity**: - PWM is generally more robust against noise because it relies on the timing of the pulses rather than their amplitude. - PAM can be more susceptible to noise, as variations in amplitude can lead to errors in signal interpretation. In summary, the main difference lies in how they encode information: PWM uses pulse width, while PAM uses pulse amplitude.
PWM is the abbreviation for Pulse Width Modulation, which changes the pulse width of a series of pulses according to a certain rule to adjust the output quantity and waveform.
PAM is the abbreviation for Pulse Amplitude Modulation, which changes the pulse amplitude of a series of pulses according to a certain rule to adjust the output value and waveform.
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