Downmixing Method for 22.2 Multichannel Sound Signal in 8K Super Hi-Vision Broadcasting

摘要

A downmixing method for a 22.2 multichannel sound signal that can provide a 2-channel signal via a 5.1-channel signal was investigated for 8K Super Hi-Vision broadcasting. The proposed downmixing method is composed of downmixing equations and initial downmixing coefficients optimized for transmission by MPEG-4 AAC. The proposed downmixing equations and initial downmixing coefficients were examined considering a tandem downmixing function that downmixes multichannel sound signals to 2-channel via 5.1 -channel. A subjective evaluation was carried out and the obtained result proved that the proposed method is suitable for the 22.2 multichannel sound broadcasting.