Parameter encoding and decoding

Several examples of encoding and decoding techniques are disclosed. In particular, an audio synthesizer (300) for generating a synthesized signal (336, 340, yR) from a downmix signal (246, x), comprising: an input interface (312) for receiving the downmix signal (246, x), the downmix signal (246, x) having a plurality of downmix channels and side information (228), the side information (228) comprising channel levels and related information (314, xi, chi) of an original signal (212, y), the original signal (212, y) having a plurality of original channels; and a synthesis processor (404) for generating a synthesized signal (336, 340, yR) according to at least one mixing rule using: a channel level of the original signal (212, y) and related information (220, 314, zeta, chi); and covariance information (Cx) associated with the downmix signal (324, 246, x). 公开了编码和解码技术的几个示例。特别地，一种音频合成器(300)，用于从降混信号(246，x)产生合成信号(336，340，yR)，包括：输入接口(312)，用于接收降混信号(246，x)，降混信号(246，x)具有多个降混声道和侧信息(228)，侧信息(228)包括原始信号(212，y)的声道电平和相关信息(3