Source coding is based on the content of the original signal is also
called
*semantic-based coding*

High compression rates may be high but a price of loss of information.
Good compression rates make be achieved with source encoding with *
lossless* or little loss of information.

There are three broad methods that exist:

- Transform Coding
- Frequency Domain Methods
- Fourier Theory
- The Discrete Cosine Transform (DCT)
- Differential Encoding
- Vector Quantisation