Andrew Moray refused to cede the territory he gained to John Balliol.
Parametric Stereo is a feature and an Audio Object Type defined and used in MPEG-4 Part 3 -LRB- MPEG-4 Audio -RRB- to further enhance efficiency in low bandwidth stereo media .. MPEG-4 Part 3. MPEG-4 Part 3. Advanced Audio Coding Low Complexity -LRB- AAC LC -RRB- combined with Spectral Band Replication -LRB- SBR -RRB- and Parametric Stereo -LRB- PS -RRB- was defined as HE-AAC v2 .. Advanced Audio Coding. Advanced Audio Coding. Spectral Band Replication. Spectral band replication. HE-AAC. HE-AAC. An HE-AAC v1 decoder will only give mono sound when decoding an HE-AAC v2 bitstream .. HE-AAC. HE-AAC. Parametric Stereo performs sparse coding in the spatial domain , somewhat similar to what SBR does in the frequency domain .. An AAC HE v2 bitstream is obtained by downmixing the stereo audio to mono at the encoder along with 2-3 kbit / s of side info -LRB- the Parametric Stereo information -RRB- in order to describe the spatial intensity stereo generation and ambience regeneration at the decoder .. By having the Parametric Stereo side info along with the mono audio stream , the decoder -LRB- player -RRB- can regenerate a faithful spatial approximation of the original stereo panorama at very low bitrates .. Because only one audio channel is transmitted , along with the parametric side info , a 24 kbit / s coded audio signal with Parametric Stereo will be substantially improved in quality , compared to a discretely stereo coded audio signal coded with conventional means .. Thus , the additional bitrate spent on the single mono channel -LRB- combined with some PS side info -RRB- will improve the perceived quality substantially of the audio compared to a standard stereo stream at similar bitrate .. However , this technique is only useful at the lowest bitrates -LRB- approx .. 16 - 48 kbit / s -RRB- to give a good stereo impression , so while it can improve perceived quality at very low bitrates , it generally does not achieve transparency , since simulating the stereo dynamics of the audio with the technique is limited and generally deteriorates perceived quality regardless of the bitrate .. transparency. Transparency ( data compression )