Multichannel audio coding/decoding system and method

Abstract

The invention elates to multichannel audio coding / decoding system and method. A multichannel signal is converted into a front pair of stereo signals and a rear pair of stereo signals, dynamic information simulating minor rotation of a human head is added, the two pairs of stereo signals are modulated to achieve corresponding changes, and accordingly hearing effect of common stereo after downmix is unaffected. In addition, a receiving end is also capable of decoding the dynamic information to distinguish the front and rear pairs of stereos and distributing the stereos to a multichannel system for playing, so that surround is well replayed. The multichannel audio coding / decoding system and method are applicable to broadcasting systems and can be applied to private spaces such as home and cars to well replay the surround. The dynamic information simulating minor rotation of the human head is embedded during coding, and accordingly the hearing effect of down-mixed stereo signals is unaffected, and the dynamic information can be decoded to distinguish the front and rear sound sources and clarify sound source locations when the multichannel signal is restored.

Description

Technical field [0001] The invention relates to the technical field of acoustic signal processing, in particular to a multi-channel audio coding and decoding system and a method thereof. Background technique [0002] With the wide application of multi-channel digital audio coding and decoding technology and the enrichment of multi-channel surround sound programs, how to enjoy high-quality surround sound programs through traditional transmission channels (such as broadcasting) in private spaces such as homes and automobiles is gradually being valued . [0003] Beginning in the 1970s, Matrix Surround codec was proposed for the compatibility between multi-channel signals and dual-channel stereo. The encoding matrix makes the relationship between the left and right channels of the down-mixed stereo correspond to the spatial information of the sound source. , The decoding matrix recovers as much as possible the multi-channel signal with the same spatial location as the original surroun...

AI Technical Summary

Problems solved by technology

However, when there are multiple sound sources and background sounds in practice, the stereo signal mixed down by the matrix codec technology often suffers from serious crosstalk interference and loss of positioning information, especially the sound quality and positioning information of the original surround channel. Damage, there is too much crosstalk between the channels of the decoded output signal, resulting in poor sound source localization, sound coloring, and no clear localized background surround sound

In addition, if the sound image is in the rear half plane, the phase of the left and right channels of the down-mixed stereo signal is opposite, which affects the normal listening of ordinary users

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