Audio Coding

All lossy source coding techniques can be interpreted as vector quantization (VQ) with variable length coding ². The coding scheme used in this coder uses an orthonormal transform (see 4.1.3) as a fixed codebook for vector quantization of MDCT (see 4.1.1) transform coefficients. Variable length coding is done by a number of Huffman codes on the VQ coefficients.

Before I can move on to the actual coding, I introduce the transforms used in the coder.

Figure 7: A schematic view of the coder.