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3-ANNEX C (informative)
THE ENCODING PROCESS
3-C.1 Encoder
3-C.1.1 Overview
For each of the Layers, an example of one suitable encoder with the corresponding flow-diagram is
given in this annex. In subsequent clauses the analysis subband filter and the layer-specific encoding
techniques are described. In Annex D two examples of psychoacoustic models, which are common to
all layers, are described. A short introduction describes the overall philosophy.
INTRODUCTION
The MPEG-Audio algorithm is a psychoacoustic algorithm. The figure below shows the primary parts
of a psychoacoustic algorithm.
Digital
Audio Quantized Encoded
Input Filter Bit or Samples Bitstream Bitstream
Bank Noise Formatting
Allocation
Signal to
Psychoacoustic
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