HDMI (High-Definition Multimedia Interface) cables are video/audio cables that transfer high-definition data using a digital format. HDMI cables connect media devices such as video game consoles, personal computers, DVD players, cable boxes and video/audio players such as AV receivers and televisions. The cables are similar to analog cables like radio, coaxial and S-video cables. HDMI cables transform analog signal formats to digital signal format which increases picture quality on HD televisions. The cables enable electronic communication in several HD media devices.
Structure of HDMI Cable
A common HDMI cable contains 19 pins on the female end of the plug. Each of these pins serves a different function. The first of the nine pins transform analog signals to packets of digital data that are transferred to other data channels. Three pins in the plug transmit and convert digital data via a given channel.
The initial nine pins in the cable provide data to these three pins for conversion. Pins 12 and 10 regulate data flow in the first of the nine pins and make sure all data signals coordinate with each other. The remaining pins perform other functions such as maintaining communication between connected media devices and giving the HDMI cable power.
Digital data coding
A typical HDMI cables has a couple of twisted wires that are responsible for the smooth functioning of the core transmission in the cable. Before a signal is transmitted from a media device like a cable box, the HDMI cable transforms and encodes the transmitted signal to prevent its degradation as it travels in the cable.
The media device transfers the data in wither digital or analog format, based on whether the media device is HD or not. The cable obtains the signal and one wire in the pair transfers the signal for playing on the media device. The other wire transfers a mirror image of the signal. The media player device obtains the inverse and the original signals and measures their differences. It then uses the measured difference to correct any degradation of signal that could have happened during transmission of data.
Length of the HDMI cable
Even though there is no length limit for HDMI cables, long cables can cause signal degradation. Many manufacturers of HDMI cables won’t produce cables that are over 16 feet in length. Few cables used in big theaters are longer but they are higher in quality and more expensive.
Benefits of HDMI cables
• HDMI cables provide uncompressed digital sound and video vial one connection. The cables have 5Gbps potential bandwidth and are capable of adapting to new technologies that are being developed in the field.
• HDMI cables connect the digital space between the digital output and the digital source. Keep in mind that you can use a HDMI splitter box if you want to split the signal to more than one digital output. The cables do not convert data into analog formats for transmission as done by other cables. HDMI cables provide a better sound and picture with clear digital presentation of recorded media.
• HDMI cables are able to support an extensive range of HD resolutions. The cables can also deliver standard video definition in NTSC and PAL formats.
• HDMI cables provide a total compatibility with DVI.
HDMI cables also offer dual direction communication between media sources enabling innovative functions. One HDMI cable can replace several wires that can increase management and decrease mess along with providing higher performance.