# Basic tools

1.  [Modified discrete cosine transform
    (MDCT)](Modified_discrete_cosine_transform_MDCT_)
2.  [Entropy coding](Entropy_coding)
3.  [Perceptual modelling in speech and audio
    coding](Perceptual_modelling_in_speech_and_audio_coding)
4.  [Vector quantization (VQ)](../ITSPhtml/Vector_quantization_VQ_)
5.  [Linear
    prediction](https://wiki.aalto.fi/display/ITSP/Linear+prediction)