Abstract
Parametric-stereo coding is a technique to efficiently code a stereo audio signal as a monaural signal plus a small amount of parametric overhead to describe the stereo image. The stereo properties are analyzed, encoded, and reinstated in a decoder according to spatial psychoacoustical principles. The monaural signal can be encoded using any (conventional) audio coder. Experiments show that the parameterized description of spatial properties enables a highly efficient, high-quality stereo audio representation.
Highlights
Efficient coding of wideband audio has gained large interest during the last decades
In 1907, Lord Rayleigh formulated the duplex theory [25], which states that sound-source localization is facilitated by interaural intensity differences (IIDs) at high frequencies and by interaural time differences (ITDs) at low frequencies
This experiment is useful for two reasons: firstly, to verify statements by others on the maximum quality that can be obtained using parametric stereo, secondly, if parametric stereo is included in an audio coder, the maximum overall bit rate at which parametric stereo still leads to a coding gain compared to conventional stereo techniques is in part dependent on the quality limitations induced by the parametric-stereo algorithm
Summary
Efficient coding of wideband audio has gained large interest during the last decades. Studies indicate only limited success in exploiting coherence using such techniques [9, 10] These results indicate that exploiting cross-channel redundancies, even if the signal model is able to capture relative time delays, does not lead to a large coding gain. It is well known that for high frequencies (typically above 2 kHz), the human auditory system is not sensitive to fine-structure phase differences between the left and right signals in a stereo recording [11, 12] This phenomenon is exploited by a technique referred to as “intensity stereo” [13, 14].
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