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Pulse Modulation PPT Physics Class 12
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Page 1 The Chapter includes: • Pulse Amplitude Modulation • Pulse Width Modulation • Pulse Position Modulation • Pulse Code Modulation PULSE MODULATION The process of transmitting signals in the form of pulses (discontinuous signals) by using special techniques. Page 2 The Chapter includes: • Pulse Amplitude Modulation • Pulse Width Modulation • Pulse Position Modulation • Pulse Code Modulation PULSE MODULATION The process of transmitting signals in the form of pulses (discontinuous signals) by using special techniques. Analog Pulse Modulation Digital Pulse Modulation Pulse Amplitude (PAM) Pulse Width (PWM) Pulse Position (PPM) Pulse Code (PCM) Delta (DM) Pulse Modulation Pulse Amplitude Modulation (PAM): * The signal is sampled at regular intervals such that each sample is proportional to the amplitude of the signal at that sampling instant. This technique is called “sampling”. * For minimum distortion, the sampling rate should be more than twice the signal frequency. Page 3 The Chapter includes: • Pulse Amplitude Modulation • Pulse Width Modulation • Pulse Position Modulation • Pulse Code Modulation PULSE MODULATION The process of transmitting signals in the form of pulses (discontinuous signals) by using special techniques. Analog Pulse Modulation Digital Pulse Modulation Pulse Amplitude (PAM) Pulse Width (PWM) Pulse Position (PPM) Pulse Code (PCM) Delta (DM) Pulse Modulation Pulse Amplitude Modulation (PAM): * The signal is sampled at regular intervals such that each sample is proportional to the amplitude of the signal at that sampling instant. This technique is called “sampling”. * For minimum distortion, the sampling rate should be more than twice the signal frequency. AND Gate Pulse Shaping Network FM Modulator Analog Signal PAM - FM Pulses at sampling frequency HF Carrier Oscillator PAM Pulse Amplitude Modulator Analog Signal Amplitude Modulated Pulses Page 4 The Chapter includes: • Pulse Amplitude Modulation • Pulse Width Modulation • Pulse Position Modulation • Pulse Code Modulation PULSE MODULATION The process of transmitting signals in the form of pulses (discontinuous signals) by using special techniques. Analog Pulse Modulation Digital Pulse Modulation Pulse Amplitude (PAM) Pulse Width (PWM) Pulse Position (PPM) Pulse Code (PCM) Delta (DM) Pulse Modulation Pulse Amplitude Modulation (PAM): * The signal is sampled at regular intervals such that each sample is proportional to the amplitude of the signal at that sampling instant. This technique is called “sampling”. * For minimum distortion, the sampling rate should be more than twice the signal frequency. AND Gate Pulse Shaping Network FM Modulator Analog Signal PAM - FM Pulses at sampling frequency HF Carrier Oscillator PAM Pulse Amplitude Modulator Analog Signal Amplitude Modulated Pulses * In this type, the amplitude is maintained constant but the duration or length or width of each pulse is varied in accordance with instantaneous value of the analog signal. * The negative side of the signal is brought to the positive side by adding a fixed d.c. voltage. Analog Signal Width Modulated Pulses Pulse Width Modulation (PWM or PLM or PDM): Page 5 The Chapter includes: • Pulse Amplitude Modulation • Pulse Width Modulation • Pulse Position Modulation • Pulse Code Modulation PULSE MODULATION The process of transmitting signals in the form of pulses (discontinuous signals) by using special techniques. Analog Pulse Modulation Digital Pulse Modulation Pulse Amplitude (PAM) Pulse Width (PWM) Pulse Position (PPM) Pulse Code (PCM) Delta (DM) Pulse Modulation Pulse Amplitude Modulation (PAM): * The signal is sampled at regular intervals such that each sample is proportional to the amplitude of the signal at that sampling instant. This technique is called “sampling”. * For minimum distortion, the sampling rate should be more than twice the signal frequency. AND Gate Pulse Shaping Network FM Modulator Analog Signal PAM - FM Pulses at sampling frequency HF Carrier Oscillator PAM Pulse Amplitude Modulator Analog Signal Amplitude Modulated Pulses * In this type, the amplitude is maintained constant but the duration or length or width of each pulse is varied in accordance with instantaneous value of the analog signal. * The negative side of the signal is brought to the positive side by adding a fixed d.c. voltage. Analog Signal Width Modulated Pulses Pulse Width Modulation (PWM or PLM or PDM): * In this type, the sampled waveform has fixed amplitude and width whereas the position of each pulse is varied as per instantaneous value of the analog signal. * PPM signal is further modification of a PWM signal. It has positive thin pulses (zero time or width) corresponding to the starting edge of a PWM pulse and negative thin pulses corresponding to the ending edge of a pulse. * This wave can be further amended by eliminating the whole positive narrow pulses. The remaining pulse is called clipped PPM. PWM PPM Pulse Position Modulation (PPM):Read More
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Nov 22, 2024 Last updated |
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