3D Audio Coding Approach Based on Spatial Perception Features

A new three-dimensional(3D) audio coding approach is presented to improve the spatial perceptual quality of 3D audio. Different from other audio coding approaches, the distance side information is also quantified, and the non-uniform perceptual quantization is proposed based on the spatial perception features of the human auditory system, which is named as concentric spheres spatial quantization(CSSQ) method. Comparison results were presented, which showed that a better distance perceptual quality of 3D audio can be enhanced by 5.7%~8.8% through extracting and coding the distance side information comparing with the directional audio coding, and the bit rate of our coding method is decreased of 8.07% comparing with the spatial squeeze surround audio coding.

3D视音频技术综述

随着2009年底卡梅隆导演的《阿凡达》影片的热映,三维立体(3D Stereo)显示技术成为目前火热的技术之一,通过左右眼信号分离,在显示平台上能够实现的立体图像显示。立体显示是VR虚拟现实的一个实现沉浸交互的方式之一,3D(3 dimensional)立体显示可以把图像的纵深,层次,位置等细节全部展现,观察者更直观地了解图像的现实分布状况,从而更全面了解图像或显示内容的信息。为了配合3D立体视觉环境,介绍了3D音频技术,它是未来的一个趋势,并且对3D音频技术的基本理论、声学特点和发展状况等给出了看法。

2022卡塔尔世界杯E14演播室群音频制作的创新点

解析中央广播电视总台在2022卡特尔世界杯赛事制播中,基于E4演播室群的三维声信号制作,“控、管、监”系统的应用,以及IP评论盒的使用的创新点。

三维音频技术在航空领域的应用与展望

从三维音频技术对于提升态势感知能力的好处和三维音频在国外航空领域的应用出发,分析了三维音频技术在3D音频告警、话音通信、飞行模拟、无人机操控这四类航空领域的主要应用场景,讨论了三维音频技术在机载环境应用中需考虑的高精度个性化头相关传递函数获取、头部跟踪及环境适应性等关键技术,最后总结出了技术发展趋势。相关内容可供机载音频技术研究人员参考。

一种机载三维音频技术的快速计算方法

针对机载三维音频应用的实时性需求,提出了一种基于单耳相对头相关传递函数和改进型混响模型的机载三维音频快速实现方法,在较传统实现方式性能无明显下降的情况下降低了80%的计算量。对提出的算法在F-16战斗机模拟强噪声环境下进行相关主观试听实验,同时在某型飞机音频系统中实验验证。实验结果表明,所提方法在实时处理3路三维音频时,三维音频方位分辨精度在5°以内,可满足实际机载平台使用需求。

Sound image externalization for headphone based real-time 3D audio

3D audio effects can provide immersive auditory experience, but we often face the so-called in-head localization （IHL） problem in headphone sound reproduction. To ad- dress this problem, we propose an effective sound image externalization approach. Specifically, we consider several important factors related to sound propagation, which include image-source model based early reflections with distance decay, wall absorption and air absorption, late reverberation and other dynamic factors like head movement. We apply our sound image externalization approach to a headphone based real-time 3D audio system. Subjective listening tests show that the sound image externalization performance is significantly improved and the sound source direction is preserved as well. A/B preference test further shows that, as compared with a recent popular approach, the proposed approach is mostly preferred by the listeners.

支持HDR和三维声的4K超高清电视端到端系统架构

本文面向4K超高清电视发展趋势,依据超高清电视相关技术标准,分析了支持高动态范围、三维声技术的4K超高清节目制作、编码、传输、接收解码等端到端各环节的技术需求,提出了端到端应用系统架构,搭建了基于AVS2编解码的端到端试验系统并开展了相关试验,为4K超高清电视系统级部署实施提供技术参考。

Unequal Error Protection Based on Expanding Window Fountain for Object-Based 3D Audio

This paper proposes an unequal error protection（UEP）coding method to improve the transmission performance of three-dimensional（3D）audio based on expanding window fountain（EWF）.Different from other transmissions with equal error protection（EEP）when transmitting the 3D audio objects.An approach of extracting the important audio object is presented,and more protection is given to more important audio object and comparatively less protection is given to the normal audio objects.Objective and subjective experiments have shown that the proposed UEP method achieves better performance than equal error protection method,while the bits error rates（BER）of the important audio object can decrease from 10^（–3） to 10^（–4）,and the subjective quality of UEP is better than that of EEP by 14%.

中央广播电视总台B1录音车系统简介

随着三维声技术和IP化音频(Audio over IP,AOIP)技术的高速发展,在4K超高清电视节目制作规范已经出台的背景下,中央广播电视总台新建了两辆三维声录音车以应对越来越多的节目制作需求。对此,简要介绍B1录音车系统,其中音频系统采用全IP架构,主制作区具有三维声制作能力和监听环境,能够实现5.1.4制作;副制作区具有5.1环绕声制作能力和监听环境。本文从不同方面阐述了系统优化的可行性。

浅析2022年北京冬奥会开闭幕式8K公共信号的音频系统

阐述2022年北京冬奥会开闭幕式8K公共信号的音频系统架构、信号传输,以及基于三维声格式声音制作中的关键环节。