As the length of the HDMI cable increases, the attenuation of the signal during transmission will gradually increase. This is because the signal will encounter resistance as it travels through the wire, resulting in a gradual weakening of the signal strength.
A longer HDMI cable means that the signal needs to travel a longer path, which increases the degree of signal attenuation. Longer HDMI cables are more susceptible to external electromagnetic interference. For example, the surrounding power cord, electrical equipment, etc., may produce electromagnetic interference, and the interference signal will be mixed with the HDMI signal, affecting the quality of the signal. This external cable may itself become an antenna, accepting external interference signals.
The length range of HDMI is divided into the following three length ranges:
(1)The short length of HDMI cable is generally less than 5 meters. In this length range, the HDMI cable can transmit the signal stably, and the image and audio quality are basically not affected. For device connections in most home and office environments, this length of cable is sufficient to meet this requirement.
(2)HDMI cable medium length is 5 meters to 15 meters. As the length increases, some minor signal problems may occur, such as occasional noise in the image. Color slightly distorted, etc. In this range, you can consider using better quality HDMI cables, and cables with signal enhancement functions may better ensure the quality of signal transmission.
(3)However, when the length of the HDMI cable is more than 15 meters, the signal transmission problem may be more obvious. The image may have severe snowflakes, flicker and no signal, and the audio may also be noisy or interrupted.
If possible, the length of the HDMI cable can be minimized to reduce the distance of the signal transmission by optimizing the layout of the device. For example, devices can be placed closer together or the length of the cable can be reduced by using methods such as wall-mounted mounting.
