What features do I look for in a HDMI switch:
-Expandability: 5 port HDMI switch is recommended for future expandability. If you use a 2 port, then you have no expandability. It is likely that future HD sources such as games stations, HD DVD player/recorders will utilize HDMI.
-HDCP transparancy: any switch must pass HDCP data between source and monitor.
- Backward compatibility with DVI-D: There is a mix of both HDMI and DVI-D devices in the field. Users should select a HDMI switch rather than a DVI-D switch since HDMI is backward compatible with DVI-D. With a HDMI switch., the user just chooses the correct cables needed; either HDMI or HDMI to DVI-D to customize to your system.
- Remote control: A remote control to select the desired channel is essential.
What is a HDMI switch with Toslink Routing:
Many consumers who recently purchased a HD Display and especially those who are installing front -projector systems already have an existing Surround Sound Audio Receiver that need to be converted to one with HDMI switching functions.
For those seeking to integrate with their existing Surround Sound Audio Receivers, the 4x1 HDMI switch with TOSLINK Routing can be used to accomplish this. This easy to use unit includes 4 HDMI Inputs and also Optical Digital Audio switching for maximum port expansion and integration with existing audio video receivers
Design consideration of a HDMI switch:
HDMI is extremely high speed digital transmission standard with an aggregate data rate of ~4.95 Gbps. Jean Baptiste Fourier (1768-1830) showed that any signal waveform can be resolved into a summation of harmonically related sine waves. The amplitude of the sine waves can be determined by calculation of Fourier transforms.
So what in the world does some dead French mathematician have to do with the HDMI switch? Well, Fourier tells us that the waveform is a summation of harmonically related sine waves. Therefore, higher data rate, higher frequency sine waves. Incidentally, the frequency of the fundamental sine wave is Â½ of the data rate. For example, the fundamental frequency of a 2 Gbps ( 50 % duty cycle ) square wave is 1GHz.
As data rates increase, every aspect of the switch design (every millimeter) becomes critical because the wavelengths of the signals approach the size of the components on board. The 3 critical parameters to consider are: