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Q & A: Sending AV Signals

We'd like to transmit audio and video from our church services from the main sanctuary to rooms around our campus. However, although not every room has coaxial cable, every room does have a network connection. What's the best way to send the AV signals over a pre-existing network?

Q: We'd like to transmit audio and video from our church services from the main sanctuary to rooms around our campus. However, although not every room has coaxial cable, every room does have a network connection. What's the best way to send the AV signals over a pre-existing network?

A: The easiest way to transmit real-time video and audio signals across an existing IP network is by using an MPEG-2/4 encoder and decoder system. The encoder sits at the source location and provides a video and audio input, which is encoded to MPEG-2/4 format and is injected onto the IP network. A decoder is connected to the IP network at the endpoint and provides a video and audio output that can be connected to a display device such as a TV, plasma display, or projector. There are many different solutions available that are capable of doing this, but the best I've come across is the AMX MAX CDE (encoder) and AMX MAX CSD10 (decoder). These products provide quality results with some additional features such as RS232/422/485 and IR control of source or display devices, which I've found invaluable for creating fully integrated systems.

— Daniel Baldwin, director, Dr Audio Group Pty Ltd., Victoria, Australia

Next Month's Question: We've been experiencing Blackberry and Bluetooth interference with our wired microphones. The interference consistently occurs, regardless of where the devices are located in the room or how close they are to the microphones. Would adding shielding to our mics/cables help?

— Joe Grandalski, digital media specialist/audio engineer, Alexander Gallo & Associates Court Reporting and Video Services Inc., Atlanta

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