公开(公告)号：WO2017055485A1

公开(公告)日：2017-04-06

申请号：PCT/EP2016/073316

申请日：2016-09-29

Applicant: DOLBY INTERNATIONAL AB

Inventor： BOEHM, Johannes ,  CHEN, Xiaoming

IPC: H04S5/00 ,  H04S7/00

CPC classification number: H04S5/00 ,  H04S7/30 ,  H04S2400/05 ,  H04S2400/11 ,  H04S2420/11

Abstract: For generating 3D audio content from a two-channel stereo signal, the stereo signal ( x ( t )) is partitioned into overlapping sample blocks and is transformed into time-frequency domain. From the stereo signal directional and ambient signal components are separated, wherein the estimated directions of the directional components are changed by a predetermined factor, wherein, if changes are within a predetermined interval, they are combined in order to form a directional centre channel object signal. For the other directions an encoding to Higher Order Ambisonics (HOA) is performed. Additional ambient signal channels are generated by de-correlation and rating by gain factors, followed by encoding to HOA. The directional HOA signals and the ambient HOA signals are combined, and the combined HOA signal and the centre channel object signals are transformed to time domain.

Abstract translation: 为了从双声道立体声信号生成3D音频内容，立体声信号（x（t））被划分为重叠的采样块并被转换成时频域。 从立体声信号方向和环境信号分量分离出其中方向分量的估计方向改变预定因子，其中如果改变在预定间隔内，它们被组合以便形成定向中心信道对象信号 。 对于其他方向，执行对高阶Ambisonics（HOA）的编码。 额外的环境信号通道是通过增益因子的去相关和额定值产生的，随后编码到HOA。 方向性HOA信号和环境HOA信号被组合，并且组合的HOA信号和中心信道对象信号被变换到时域。

公开(公告)号：WO2017081222A1

公开(公告)日：2017-05-18

申请号：PCT/EP2016/077382

申请日：2016-11-11

Applicant: DOLBY INTERNATIONAL AB

Inventor： KRUEGER, Alexander ,  BOEHM, Johannes ,  KORDON, Sven ,  CHEN, Xiaoming ,  ABELING, Stefan ,  KEILER, Florian ,  KROPP, Holger

IPC: H04S7/00

CPC classification number: H04S7/30 ,  H04S2400/11 ,  H04S2420/11

Abstract: Currently there is no simple and satisfying way to create 3D audio from existing 2D content. The conversion from 2D to 3D sound should spatially redistribute the sound from existing channels. From a multi-channel 2D audio input signal (x (k) (t)) a 3D sound representation is generated which includes an HOA representation Formula (I) and channel object signals Formula (II) scaled from channels of the 2D audio input signal. Additional signals Formula (III) placed in the 3D space are generated by scaling (21, 222; 41, 422; Formula (IV)) channels from the 2D audio input signal and by decorrelating (24, 25; 44, 45, 451; Formula (V)) a scaled version of a mix of channels from the 2D audio input signal, whereby spatial positions for the additional signals are predetermined. The additional signals Formula (III) are converted (27; 47) to a HOA representation Formula (I).

Abstract translation:

目前没有简单且令人满意的方式来从现有2D内容创建3D音频。 从2D到3D声音的转换应在空间上重新分配现有声道的声音。 从多声道2D音频输入信号（x（k）（t））生成3D声音表示，其包括HOA表示公式（I）和通道对象信号公式（II） 2D音频输入信号的通道。 通过从2D音频输入信号缩放（21,222; 41,422;公式（IV））信道并且通过去相关（24,25; 44,45,451; 公式（V））来自2D音频输入信号的信道混合的缩放版本，由此预定附加信号的空间位置。 将附加信号公式（III）转换（27; 47）为HOA表示公式（I）。