With the increasing popularity of solid sate lighting devices, Visible Light Communication (VLC) is globally recognized as an advanced and promising technology to realize short-range, high speed as well as large capac...With the increasing popularity of solid sate lighting devices, Visible Light Communication (VLC) is globally recognized as an advanced and promising technology to realize short-range, high speed as well as large capacity wireless data transmission. In this paper, we propose a prototype of real-time audio and video broadcast system using inexpensive commercially available light emitting diode (LED) lamps. Experimental results show that real-time high quality audio and video with the maximum distance of 3 m can be achieved through proper layout of LED sources and improvement of concentration effects. Lighting model within room environment is designed and simulated which indicates close relationship between layout of light sources and distribution of illuminance.展开更多
Data broadcast is an important data dissemination approach in mobile environment. On broadcast channel, scalability and efficiency of data transmission are satisfied. In a mobile environment, there exists a kind of re...Data broadcast is an important data dissemination approach in mobile environment. On broadcast channel, scalability and efficiency of data transmission are satisfied. In a mobile environment, there exists a kind of real-time database application in which both the transactions and data can have their timing constraints and priorities of different levels. In order to meet the requirement of real-time data disseminating and retrieving, a broadcast scheduling strategy HPF-ED F (Highest Priority First with Earlier Deadline and Frequency) is proposed under the BoD (Broadcast on Demand) model. Using the strategy, data items are scheduled according to their priority the transaction imposed on them or system set for them. The strategy also considers other characteristics of data items such as deadline and popularity of data. The extensive simulation experiments have been conducted to evaluate the performance of the proposed algorithm. Results show that it can achieve excellent performance compared with existing strategies.展开更多
Given the asymmetric communication capabilities in mobile real time environments, traditional serializability based approaches are too restrictive, unnecessary, and impractical. Thus propose the use of a new weaker co...Given the asymmetric communication capabilities in mobile real time environments, traditional serializability based approaches are too restrictive, unnecessary, and impractical. Thus propose the use of a new weaker correctness criterion is proposed. This paper first formally defines the new notion of correctness called weak serializability. After the necessary and sufficient conditions for weak serializability are shown, corresponding concurrency control protocol based on this criterion is outlined for real time broadcast environments. Finally, the simulation results confirmed that the proposed techniques help mobile transactions to meet their deadlines and improve query response time.展开更多
近几年,由于媒体融合的发展以及A地区广播电台的技术进步,A台原有的总控系统功能模块在逐步扩充,已经不能很好地满足广电行业今后发展需要。为了更好地整合现有信息,提高科技服务的支持水平,保证播出安全,构建覆盖广播音频、可视广播视...近几年,由于媒体融合的发展以及A地区广播电台的技术进步,A台原有的总控系统功能模块在逐步扩充,已经不能很好地满足广电行业今后发展需要。为了更好地整合现有信息,提高科技服务的支持水平,保证播出安全,构建覆盖广播音频、可视广播视频、网络流媒体接入、处理、调度、分发及监控等功能为一体的广播融媒体播控中心,是广播发展融媒化的必然要求。基于此,详细阐述了A台网际互联协议化音频(Audio over Internet Protocol,AoIP)广播电视融媒体传播控制中心的设计细节及特色。展开更多
近年来,随着数字广播工作的持续推进,形成了完善的中国数字化广播(China Digital Radio,CDR)行业与技术标准,并被应用于广播电视工程。文章主要探索广播电视工程中数字音频广播CDR技术的运用,通过数字音频技术与广播电视工程的有机结合...近年来,随着数字广播工作的持续推进,形成了完善的中国数字化广播(China Digital Radio,CDR)行业与技术标准,并被应用于广播电视工程。文章主要探索广播电视工程中数字音频广播CDR技术的运用,通过数字音频技术与广播电视工程的有机结合,推动广播电视质量的提升,满足观众多样化的需求,有助于新时代背景下广播电视工程的持续发展。展开更多
光纤共享模式利用多重数字音频接口(Multi-channel Audio Digital Interface,MADI)技术,有效管理和传输广播电视音频信号。详细讨论该模式的系统设计,包括主备混音设备配置、光纤分配切换单元功能以及远程与本地共享机箱的应用。通过具...光纤共享模式利用多重数字音频接口(Multi-channel Audio Digital Interface,MADI)技术,有效管理和传输广播电视音频信号。详细讨论该模式的系统设计,包括主备混音设备配置、光纤分配切换单元功能以及远程与本地共享机箱的应用。通过具体案例分析该技术在广播中的实际应用,展示其在提升音质、降低成本和增强系统可靠性方面的显著效益。结果表明,光纤共享模式显著优化了音频处理流程,降低了维护成本,提高了广播系统的整体效率和稳定性。展开更多
传统广播与新媒体的融合,提升了广播媒体的传播力和影响力,在更好地满足受众需求的同时,带来了较大的经济效益。广播融媒直播系统基于全媒体设计,搭建了内容生产、发布和融合信号汇聚的全网际互连协议(Internet Protocol,IP)技术平台,...传统广播与新媒体的融合,提升了广播媒体的传播力和影响力,在更好地满足受众需求的同时,带来了较大的经济效益。广播融媒直播系统基于全媒体设计,搭建了内容生产、发布和融合信号汇聚的全网际互连协议(Internet Protocol,IP)技术平台,依托“云+端”前后期一体化制播方案,打通了全媒体生产各流程的物理壁垒,将广播、视频直播、点播发布等各种传播形态进行深度融合,打造多元化跨界联动广播的新格局。文章主要介绍重庆广播电视集团(总台)实施的广播融媒直播及总控系统,以展示网际互联协议化音频(Audio over Internet Protocol,AoIP)和云技术在广播融媒直播系统的应用实践。展开更多
文摘With the increasing popularity of solid sate lighting devices, Visible Light Communication (VLC) is globally recognized as an advanced and promising technology to realize short-range, high speed as well as large capacity wireless data transmission. In this paper, we propose a prototype of real-time audio and video broadcast system using inexpensive commercially available light emitting diode (LED) lamps. Experimental results show that real-time high quality audio and video with the maximum distance of 3 m can be achieved through proper layout of LED sources and improvement of concentration effects. Lighting model within room environment is designed and simulated which indicates close relationship between layout of light sources and distribution of illuminance.
基金the National Natural Science Foundation of China(60073045)
文摘Data broadcast is an important data dissemination approach in mobile environment. On broadcast channel, scalability and efficiency of data transmission are satisfied. In a mobile environment, there exists a kind of real-time database application in which both the transactions and data can have their timing constraints and priorities of different levels. In order to meet the requirement of real-time data disseminating and retrieving, a broadcast scheduling strategy HPF-ED F (Highest Priority First with Earlier Deadline and Frequency) is proposed under the BoD (Broadcast on Demand) model. Using the strategy, data items are scheduled according to their priority the transaction imposed on them or system set for them. The strategy also considers other characteristics of data items such as deadline and popularity of data. The extensive simulation experiments have been conducted to evaluate the performance of the proposed algorithm. Results show that it can achieve excellent performance compared with existing strategies.
文摘Given the asymmetric communication capabilities in mobile real time environments, traditional serializability based approaches are too restrictive, unnecessary, and impractical. Thus propose the use of a new weaker correctness criterion is proposed. This paper first formally defines the new notion of correctness called weak serializability. After the necessary and sufficient conditions for weak serializability are shown, corresponding concurrency control protocol based on this criterion is outlined for real time broadcast environments. Finally, the simulation results confirmed that the proposed techniques help mobile transactions to meet their deadlines and improve query response time.
文摘近几年,由于媒体融合的发展以及A地区广播电台的技术进步,A台原有的总控系统功能模块在逐步扩充,已经不能很好地满足广电行业今后发展需要。为了更好地整合现有信息,提高科技服务的支持水平,保证播出安全,构建覆盖广播音频、可视广播视频、网络流媒体接入、处理、调度、分发及监控等功能为一体的广播融媒体播控中心,是广播发展融媒化的必然要求。基于此,详细阐述了A台网际互联协议化音频(Audio over Internet Protocol,AoIP)广播电视融媒体传播控制中心的设计细节及特色。
文摘近年来,随着数字广播工作的持续推进,形成了完善的中国数字化广播(China Digital Radio,CDR)行业与技术标准,并被应用于广播电视工程。文章主要探索广播电视工程中数字音频广播CDR技术的运用,通过数字音频技术与广播电视工程的有机结合,推动广播电视质量的提升,满足观众多样化的需求,有助于新时代背景下广播电视工程的持续发展。
文摘光纤共享模式利用多重数字音频接口(Multi-channel Audio Digital Interface,MADI)技术,有效管理和传输广播电视音频信号。详细讨论该模式的系统设计,包括主备混音设备配置、光纤分配切换单元功能以及远程与本地共享机箱的应用。通过具体案例分析该技术在广播中的实际应用,展示其在提升音质、降低成本和增强系统可靠性方面的显著效益。结果表明,光纤共享模式显著优化了音频处理流程,降低了维护成本,提高了广播系统的整体效率和稳定性。
文摘传统广播与新媒体的融合,提升了广播媒体的传播力和影响力,在更好地满足受众需求的同时,带来了较大的经济效益。广播融媒直播系统基于全媒体设计,搭建了内容生产、发布和融合信号汇聚的全网际互连协议(Internet Protocol,IP)技术平台,依托“云+端”前后期一体化制播方案,打通了全媒体生产各流程的物理壁垒,将广播、视频直播、点播发布等各种传播形态进行深度融合,打造多元化跨界联动广播的新格局。文章主要介绍重庆广播电视集团(总台)实施的广播融媒直播及总控系统,以展示网际互联协议化音频(Audio over Internet Protocol,AoIP)和云技术在广播融媒直播系统的应用实践。
