How to use the Loop out port?

HDMI LOOP OUT: This slot is to connect the HDMI input port of your display such as an HDTV.


How to use the ARC ?

ARC fuciton : If you need use ARC, your HDTV must support this fuction, When you open the ARC fuciton,the coaxial of the receiver will output the HDTV current display content audio signal.

Otherwise will output the HDMI source(DVD,set-top-box ,etc) audio signal.


What is the difference between DVI and HDMI?

HDMI is DVI with the addition of:

· Audio (up to 8-channels uncompressed)

· Smaller Connector

· Support for YUV Color Space

· CEC (Consumer Electronics Control)

· CEA-861B InfoFrames


Why do cables have an effect on signal quality?

The video signal is very sensitive, as it has to carry information spread over a wide spectrum of frequencies, from almost 0 Hertz (DC) to many MHz (millions of Hertz – oscillations - per second). When high frequencies are involved, proper cable termination (loading) is needed in order to equally transfer all frequencies and avoid an effect called “standing waves”, which is a result of signal reflections in the cable creating signal loss, “ghost” images and instability. The electrical energy stored in the video signal is perfectly transferred from the source to the acceptor if the cable is fully matched at both ends. Low quality cables are not suitable for good signal handling and usually have excessive built-in capacitance, which degrades the signal. When an inappropriate cable is used, quality of the signal deteriorates, details of the picture are lost, color fidelity is reduced and noise level, apparent as snow, destroys the picture. In addition, some low quality cables are not properly shielded, and do not isolate the video signal from external interference.


Why is the quality of sockets and connectors so im?

Just as cables, so also sockets and connectors play an important role in line matching. The optimal load of a video transmission line is 75 ohms, which is a low impedance value. A low quality connector, in which metal parts, not made or plated with silver or gold, make the connection, pose an additional load to the line, upset the 75 ohms matching, and create a host of undesirable effects. A good quality connector creates a tight contact, which is not the case when a low quality connector is used. Therefore, refrain from using low quality cables and connectors, as the savings never pay off.


When is video signal distribution needed?

Signal distribution is needed when one or more signals are to be received at several acceptors. Some examples - in a duplication studio where many copies are made from one master, in shops and at points of sale for advertising and promotion, in railway stations and airports for time and route announcement and in many other applications. In the CCTV and security field several guards may need to control the same scene on several monitors, and in educational applications, pupils in several classrooms may watch one video signal. The main object is to achieve the highest signal quality and equal outputs at each acceptor. In order to achieve high quality distributed video signals a distribution amplifier is needed. The video (and, if necessary, the audio) source is connected to the input(s) of the video distributor, and the outputs of the distributor are connected to the video acceptors. High quality cable and connectors should be used throughout. This setup is good for short distances between source, amplifier and acceptors of up to 15meters.


How to remote control a switcher?

A switcher may be remote controlled with wires or by a wireless remote controller. The wires may be either connected in parallel to the existing control switches (if allowed by the design) or using the RS-232 or RS-422 control option provided by the machine. Wireless remote control usually employs an IR (infrared) transmitting-receiving system, similar to the systems available for home remote control (TV, VCR etc.)


What are the sync related problems in video?

Sync related problems might be divided into two kinds: Problems with the sync information carried with the video signal. Problems of sync signal compatibility. As sync information is vital for video image stability, deterioration or loss of the sync signals effects image stability. Both Horizontal and Vertical sync signals are crucial for image stability and proper image centering on the screen. When the sync signals are effected, during transmission or recording, they may be recovered using a sync restoring device or a TBC (Time Base Corrector). The problem of sync compatibility exists because there are so many standards for transferring sync information with the video signal: sync signals may come in analog form, as a composite sync signal, and they may come in digital form - either composite or separate - Horizontal or Vertical, positive direction or negative. The sync signals may also be part of the luminance signals (as in Composite Video or Y/C) or ride on a video component signal - such as the “Green” signal. To solve this compatibility problem, special sync format converters are needed.

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