Parametric coding is a compression technology used for audio and speech whereby the audio or speech signal is represented by means of different parameters. These parameters are coded into a bitstream format. The decoder rebuilts the signal from these parameters.
The parameters that are used to describe the signal are a little bit different for audio and speech. Parameters that are used for audio are:
Parameters that are used for speech are:
A parametric code is especially useful for low bit-rate audio and speech coding demanding medium to good quality. Parametric coding is used in low bit-rate audio and speech codecs like MPEG-4 HVCX.