为调度通信系统增加扩播功能

针对煤矿调度通信系统扩播功能的欠缺，介绍了在原有系统的基础上进行改造的方法及改造中应注意的问题。     

无锡1000m^2电视演播室音频系统简介

本文介绍无锡市大型电视演播室音频设备的配置，及设备的功能特点。     

Ampex 6516功率放大器

Ampex No．6516型功率放大器是专门用于广播节目的监听与扩音设备。该功放性能卓越、保真度高、频率响应宽阔。     

Measurement of Supersonic Jet Noise with Optical Wave Microphone System

An optical wave microphone system is a new technique of sound measurement. This technique has been developed as a new plasma diagnostic technique to measure electron density fluctuations in the nuclear fusion research. Because the sound wave is a pressure or a density fluctuation, it is possible for this technique to measure the sound wave, too. The acoustical characteristics of the optical wave microphone system were examined by using a speaker as a first step. Next, feasibility of this device to measure jet noise was examined. It was found that the optical wave microphone system could measure the jet noise as well as a sound from speaker. Hence the optical wave microphone system can be considered one of the devices equivalent to condenser microphone. Because of these reason, this device is very convenient to scan the acoustic filed through jet flow from the inside to the out side and more preferable for not disturbing the observation field.     

KJ50型监控系统的故障分析

1 系统基本配置 KJ50型PROMOS监控系统主要由KDW10型电源,KJF21A型控制器,KPG3型急停开关,KTK1DW扩音电话,KFD1型终端器KE3002磁力启动器若干台和相关配套的电缆组成.     

网络视频会议系统的关键技术及实施方案(下)

(上接第5期108页) 4.3 技术中心会议室的部署 (1)技术中心本部大会议室面积约400m2,领导和主要人员在主席台就座,参会人员在台下就坐,采用吊装投影机和可变焦摄像枪等方式,立柱还挂装大屏幕等离子电视,如图2所示. 根据前期的试用经验,地方台站通过网络发言,声音如果接入多功能会议室的调音台后将形成回路,在会场产生较大的回音,因此我们在多功能会议室增加一套独立的音向设备,用于地方台站发言声音的扩音.