Pulse Amplitude DeModulation Block Diagram
Here, we will discuss the block diagram of Pulse Amplitude Modulation with respect to Demodulation :
Demodulation of PAM Signal
Extracting the original data from the modulated signal is the demodulation process of pulse amplitude modulation, or PAM. Typical methods include matched filtering, which compares the received signal with a reference pulse shape; envelope detection, which extracts the envelope of the signal using low-pass filtering; sample expression that samples a signal at symbol rate and compares it to threshold values; decision feedback, which combines sampling with feedback from previously observed symbols.
Pulse Amplitude Modulation
Pulse Amplitude Modulation (PAM) is a key modulation technique used in digital communication for transmitting analog data and is one of the most widely used types of analog-to-digital conversion. Its process is simple where the amplitude of a sequence of pulses changes with the instantaneous amplitude of the analog message signal. The analog signal that is to be modulated is sampled by a sequence of pulses that are amplitude-modulated on the carrier to produce the amplitude-modulated pulses.
The analog signal is sampled at regular intervals to enable the amplitude of pulses due to be produced by the carrier to be varied. The sampled values are quantized to a specific number of quantization levels or discrete levels whereupon the process is repeated. Due to its simplicity of implementation and analysis, PAM is often employed in many applications including digital communication, audio transmission, and instrumentation among others. One of the biggest drawbacks of PCM is its sensitivity towards channel errors, as poor-quality channels will introduce noise and distortion, particularly over larger distances and lower data rates.
Table of Content
- What is PAM?
- PAM Block Diagram
- Types
- Mathematical expression
- Construction
- PAM Circuit
- Solved Examples on PAM
- Applications
- Advantages
- Disadvantages