Source Encoder

Source Encoder is a machine or software responsible for compressing the Information# to source code word by removing redundant bits. Removing those redundant bits actually make the transmission process for efficient as uses less resources to produce the same or more output. It will usually proceed to Channel Encoder#.

At the receiver side, Source Encoder will atttempt to decompress the source code words into the original message signal.

Source Encoder is expected to satisfy two requirements: (1) code words are in binary form and (2) source code is uniquely decodable.

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TIT3131 Chapter 1: Information Sources and Sources Coding

Source Encoder
Prefix Coding

Note: The Source Encoder will always start in an initial state, which should be the root of the tree.
Channel Encoder

At the receiver end, Channel Encoder will transform the received channel code words into estimated source code words and pass them to #Source Encoder. In practice, Error Control Coding may be used in order to achieve acceptable performance.

Channel Encoder is a machine or software responsible for adding redundant bits to #source code words in order to transform them into channel code words which could be reliably transmitted in a potential noisy channel. It will usually proceed to Modulator#.
Average Code-Word Length

From here, we could determine the coding efficiency of the Source Encoder# as follows:

The #Source Coding could be said to be efficient when \(\eta \rightarrow 1\). If the original information isn’t lost after the source coding by Source Encoder#, then the output (source code) is considered to be lossless.

#software