Recall the block diagram of encoders shown in Figure 2.3. There are three stages that take place in an encoder: transformation, quantization, and codeword assignment. Quantization was discussed in Chapter 2. Differential coding and transform coding using two different transformation components were covered in Chapters 3 and 4, respectively. In differential coding it is the difference signal that is quantized and encoded, while in transform coding it is the transformed signal that is quantized an