What Is a Stereo Video Cable?

HDMI, short for High Definition Multimedia Interface, is also called high definition multimedia interface. In April 2002, Hitachi, Panasonic, Philips, Sony, Thomson, Toshiba and Silicon Image jointly formed the HDMI organization. HDMI can transmit uncompressed high-definition video and multi-channel audio data with high quality, and the maximum data transmission speed is 5Gbps. HDMI can not only meet the current highest resolution 1080P resolution, but also support the most advanced digital audio formats such as DVD Audio, support eight-channel 96kHz or stereo 192kHz digital audio transmission, and use only one HDMI cable connection, eliminating digital audio wiring . At the same time, the extra space provided by the HDMI standard can be applied to future audio and video formats. Before the announcement of the HDMI standard, digital video and audio interfaces were separate, and the video interface was DVI. Compared with DVI, the size of the HDMI interface is smaller, and it can transmit audio and video signals at the same time. The cable length of DVI cannot exceed 8 meters, otherwise the picture quality will be affected, and there is basically no cable length limitation for HDMI. As long as one HDMI cable can replace up to 13 analog transmission lines, it can effectively solve the problem of cluttered wires in the home entertainment system.

HDMI cable

Right!

HDMI, short for High Definition Multimedia Interface, is also called high definition multimedia interface. In April 2002, Hitachi, Panasonic, Philips, Sony, Thomson, Toshiba and Silicon Image jointly formed the HDMI organization. HDMI can transmit uncompressed high-definition video and multi-channel audio data with high quality, and the maximum data transmission speed is 5Gbps. HDMI can not only meet the current highest resolution 1080P resolution, but also support the most advanced digital audio formats such as DVD Audio, support eight-channel 96kHz or stereo 192kHz digital audio transmission, and use only one HDMI cable connection, eliminating digital audio wiring . At the same time, the extra space provided by the HDMI standard can be applied to future audio and video formats. Before the announcement of the HDMI standard, digital video and audio interfaces were separate, and the video interface was DVI. Compared with DVI, the size of the HDMI interface is smaller, and it can transmit audio and video signals at the same time. The cable length of DVI cannot exceed 8 meters, otherwise the picture quality will be affected, and there is basically no cable length limitation for HDMI. As long as one HDMI cable can replace up to 13 analog transmission lines, it can effectively solve the problem of cluttered wires in the home entertainment system.

Chinese name

High Definition Multimedia Interface

Short name

HDMI cable

Also known as

High-definition multimedia interface

Data transmission speed

Up to 5Gbps

HDMI is an all-digital interface used in both the consumer electronics field and the PC field. It can transmit uncompressed audio and video signals. Since audio and video signals are transmitted on the same cable, the number of interface cables is greatly simplified, and it has been popularized in home appliances and PCs. Since the emergence of the HDMI interface, there have been multiple versions of evolution, from HDMI 1.1 to HDMI 1.4. Although the appearance of the interface has not changed, the functionality and bandwidth have improved qualitatively. The mainstream version of the HDMI interface is HDMI 1.3 (a, b, c), but with the popularity of 3D video, a large number of HDMI 1.4 devices have also become available on the market, and they have become the key promotion products of various companies. HDMI 1.4 brings several major innovative features, including HDMI Ethernet channels, audio return channels, HDMI 3D video playback capabilities, and 4k × 2k ultra-high-resolution support.
In terms of cables, there is no version before HDMI. For example, the cables of HDMI 1.1 and HDMI 1.3 are the same, but in HDMI 1.4, some changes have occurred to the cables. The HDMI 1.4 version includes 5 types of cables, each with different functions and performance characteristics. The HDMI 1.4 version is divided into five types: standard HDMI cable, standard HDMI cable with Ethernet function, HDMI cable for car, high-speed HDMI cable, and high-speed HDMI cable with Ethernet function. The standard HDMI cable supports 1080p, and the high-speed HDMI supports advanced display technologies such as 4k × 2k, 3D video, and Deep Color. This cable is actually the previous HDMI 1.3 version, and their bandwidth requirements are all in the HDMI 1.3 version Within the provided bandwidth. The high-speed HDMI with Ethernet function also has a dedicated data channel, which is the HDMI Ethernet channel that provides network functions between devices. The cable structure has changed, which will be described later. The HDMI standard also specifies the certification labels for these five types of cables. In this evaluation sample, we also selected some cables labeled HDMI 1.4 version, but none of them have been strictly implemented in accordance with the HDMI standard.

The most common HDMI interface is TYPE A, with a width of 13.9mm and 19 pins, and a dual-link TYPE B interface is rare, with a width of 21.2mm. HDMI uses four TMDS differential signal channels in parallel, and the transmission link consists of three data channels and a clock channel. Three of the data channels are used to transmit red, green, and blue data signals, and the fourth channel is used to transmit the clock, and its clock frequency is 1/10 of the data rate. TMDS technology used by HDMI. The differential signal common mode bias voltage is + 3.3V, the port impedance is 50 ohms, the rated amplitude jumps to 500mV (+ 2.8V + 3.3V), and the voltage swing varies between 150mV 800mV. . In addition, there is DDC (

In the analog era, cable quality is closely related to signal quality, and it is also related to the length of the cable. As the length of the analog video cable increases, the video signal quality gradually decreases. As shown on the right, the image quality gradually decreases in a linear fashion. In the input signal Vi, the interference signal may be superimposed because the cable is interfered by the outside world. In the process of signal amplification, the interference signal is also amplified together. In a multi-stage amplification circuit, the interference signal may affect the normal output signal, which will cause the picture to be affected. There may be three types of loss of the analog video signal: amplitude, high frequency signal, or low frequency signal, and the picture may become dim or mild. The viewer compares the picture with the loss

As the image transmitted by the HDMI interface or

1) Prolink

2) Techlink

3) Sony

4) Monster