Crestron DM-RX1-1G Specifications download pdf (Page 9)

Crestron DigitalMedia™ Design Guide

Check website (www.crestron.com) for product availability 5

In the simplest installations, with one television and an audio processor, the EDID protocol works reasonably well. Multi-

room installations, on the other hand, can quickly become problematic, with several televisions connected to several sources

through one or more HDMI switches. The switches are responsible for collecting all of the televisions’ EDID and providing one

unified version to the source. Neither the HDMI nor the EDID specifications offer guidance in this scenario. As a consequence,

different switches behave in different ways. Combining multiple EDID can be a complicated issue, so it's worth researching

how a given switch handles it prior to installation.

Consider a simple system. The client has a 1080p projector with a surround sound processor in the home theater, and a 720p

LCD with integrated speakers in the family room. The 1080p projector also supports 720p, but obviously the customer would

prefer 1080p where possible. How should the switch combine the EDID? Some devices on the market simply copy the EDID

from the first output. In our scenario, 1080p video and surround sound audio is sent to the family room, which supports

neither. At best, this results in no audio and no video and at worst, damage to the LCD display or speakers. A slightly smarter

switch may take a “best common” approach, generating merged EDID that limits the content to only what both rooms can

support; 720p video and stereo audio. Now, the client’s sophisticated home theater can no longer achieve exceptional content

quality. Expand this scenario to the installation with five or ten rooms and this simple solution becomes inadequate.

Crestron DigitalMedia is an intelligent system that allows installers to make design decisions that set the fewest limits (if any)

on content quality across multiple displays. For example, let’s say the client only watches Blu-ray content in the home theater,

but watches cable TV in both the home theater and the family room. With the proper switch, the installer can configure input

EDID independently, so that the Blu-ray player can send the full 1080p and surround sound signal to the home theater, while

the cable box, which must support both rooms, is limited to 720p or 1080i. This isn't much of a sacrifice, since cable

companies don’t actually transmit 1080p content anyway (though some cable boxes will up-convert to 1080p). A really nice

switch accepts surround sound for the home theater, and down-mixes it to basic stereo for the family room.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 53 54

No comments

Crestron DM-RX1-1G Specifications Page 9