Issue link: https://www.e-digitaleditions.com/i/1156106
October/November/December 2019 I 23 that accept HDMI (HD 1080p and UHD 4K), USB, or VGA audio inputs for those legacy connections, while also offering the ability to switch to the active input without user interaction. Add a dedicated push-button control panel with simple on/off, volume, and source selections to accommodate non-technical end users. FIGURE 5: Interactivity via USB extension and audio enhancement make for an easy-to-install and easy-to-use system that eliminates security vulnerabilities and maintenance. USB Extender set 70v Mixing Audio Amplifier unfamiliar users, such as substitute teachers and new staff. Finally, audio enhancement is easily accomplished with the addition of an amplifier and ceiling speakers (Figure 5). Depending on user prefer- ence, room configuration, and usage, the choice of amplification and speakers can vary from a 4/8 Ohm stereo amplifier with a pair of speakers to a more distributed system that employs a 70 V amplifier with many ceiling mounted speakers for complete room coverage. With a simple con- nection to the projector or display audio output, a complete system is achieved with only four components as shown in Figure 6. 70V Speakers Projector / Flat Screen TV 70V Mixing Audio Amplifier HDMI+VGA Autoswitching HDBaseT Extender HDMI Cable 8-Button Control Panel Ethernet To WAP/LAN Ethernet To WAP/LAN HDMI HDMI HDMI VGA Audio AUDIO Audio Cable HDMI Cable VGA Cable Category-Rated Patch Cord Category Cable Speaker Cable IR Emitter HDMI ® Extender Receiver Jack AC Power Tablet PC Laptop Interactivity can also be added with USB extension between the source and interactive projector that requires only another tested Category cable link and USB plug-and- play transmitter and receiver pair. This easy-to-install system eliminates network security vulnerabilities and maintenance. It also minimizes classroom disruptions by FIGURE 6: Classroom/conference room application with control system and stereo for an easy-to-use, uncomplicated and reliable AV system.