Parametric Stereo (PS) coding is a technique to efficiently code a stereo audio signal as a monaural signal plus a small amount of stereo parameters (from a few kbit/s for medium quality and up to about 9 kbit/s for higher quality). PS technique is a part of the MPEG-4 audio parametric coding scheme published by the ISO/IEC 14496-3:2001/Amd.2:2004 [ISO14496B].
You can combine the PS technique with the SBR technology, for example, HEAACv2 audio codec.
The High Efficiency AAC v2 Profile (HEAAC v2) combines the AAC LC profile, the SBR technology, and the Parametric Stereo technique. HE-AAC v2 is widely used for mobile multimedia services.
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