Dissemination of information to citizens is a relevant component of governance. Expectedly, viewers tuned to broadcast stations within and outside their localities, expecting their receivers to faithfully reproduce th...Dissemination of information to citizens is a relevant component of governance. Expectedly, viewers tuned to broadcast stations within and outside their localities, expecting their receivers to faithfully reproduce the exact features of the transmitted signal. Akpabuyo is a dense forest zone near the creeks leading to the Atlantic ocean in Cross River State, Nigeria. The location has distinct environmental characteristics that made Akpabuyo Area Council, a challenging location to propagate electromagnetic waves;and therefore recipe for further investigation. Radio frequency analyzer, with 24 channels spectrum, ranging between 46 - 870 MHz (model: RO.VE.R.-“DLM3-T”) was deployed to capture signals from terrestrial television stations (TV). CATV measured signal of TV stations in dB, dBμV and dBmV. Its frequency ranged from 40 - 860 MHz;while varying from channel 1 to channel 69. Measurements taken from Akpabuyo L.G.A. showed the following results: the signal strength received from VHF Channel 11 ranged from 20 dBμV to 49 dBμV. From recorded empirical statistics from the study, 50% of the area received signal from this station above 30 dBμV, while other regions had signals below this value;representing the fringe zone of the frequency. The results obtained from the study relatively showed acceptance with Egli’s model. The study recorded a steady fluctuation between 17 dBμV and 19 dBμV from both propagating stations. However, Channel 27 signal at 519 MHz, had very weak signal coverage in Akpabuyo Local Government Area;with signal strength dropped to as low as 13 dB in many parts of the rural area. The study discovered that the state’s broadcasting stations, both at UHF and VHF channels did not transmit successfully across this densely forest (rural) location. Remedial measures such as installing Repeater stations at different locations as signal booster were recommended.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
文摘Dissemination of information to citizens is a relevant component of governance. Expectedly, viewers tuned to broadcast stations within and outside their localities, expecting their receivers to faithfully reproduce the exact features of the transmitted signal. Akpabuyo is a dense forest zone near the creeks leading to the Atlantic ocean in Cross River State, Nigeria. The location has distinct environmental characteristics that made Akpabuyo Area Council, a challenging location to propagate electromagnetic waves;and therefore recipe for further investigation. Radio frequency analyzer, with 24 channels spectrum, ranging between 46 - 870 MHz (model: RO.VE.R.-“DLM3-T”) was deployed to capture signals from terrestrial television stations (TV). CATV measured signal of TV stations in dB, dBμV and dBmV. Its frequency ranged from 40 - 860 MHz;while varying from channel 1 to channel 69. Measurements taken from Akpabuyo L.G.A. showed the following results: the signal strength received from VHF Channel 11 ranged from 20 dBμV to 49 dBμV. From recorded empirical statistics from the study, 50% of the area received signal from this station above 30 dBμV, while other regions had signals below this value;representing the fringe zone of the frequency. The results obtained from the study relatively showed acceptance with Egli’s model. The study recorded a steady fluctuation between 17 dBμV and 19 dBμV from both propagating stations. However, Channel 27 signal at 519 MHz, had very weak signal coverage in Akpabuyo Local Government Area;with signal strength dropped to as low as 13 dB in many parts of the rural area. The study discovered that the state’s broadcasting stations, both at UHF and VHF channels did not transmit successfully across this densely forest (rural) location. Remedial measures such as installing Repeater stations at different locations as signal booster were recommended.
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。
