Introduction of common audio and video cable classification

Before we introduced "Common Home Theater Signal Line Classification and Connection Usage", explained various wires in detail, and today we will talk about common audio and video cable classifications in an easy-to-understand way. The speaker cable is used to connect the amplifier and the speaker. The current signal flowing in it is much larger than the video and audio cables mentioned above. Because of the large amplitude of the signal, such wires often have no shielding layer. For this kind of wire, the key is to reduce Its resistance, because the output resistance of modern power amplifier is very low, so the requirements for the speaker cable are also increased, such as the choice of large cross-sectional area or stranded wire. The wire is from pure copper to silver wire. The speaker cable of the more expensive price is the special line of oxygen-free copper speaker. Its main feature is good electrical conductivity and low resistivity. It uses it to increase the sound when playing back the sound. less.

According to the classification of home speakers, it is divided into home theater speakers (generally 6) and HIFI music speakers (two), generally known as fever speakers.

HIFI speakers are used for high-fidelity restoration of the recording sound field, so there is sufficient guarantee for the lossless transmission of audio signals. Generally, the transmission line has different impedances to different frequency signals. This characteristic is reflected in the sound reproduction as the sound is blurred. For this reason, people have produced a high-end speaker connection line called an intelligent signal line. The signal is divided into two channels according to the frequency. The outer layer of a certain thickness passes the signal above 5KHZ, and the signal below 5KHZ is transmitted through the inner layer of the line, which greatly improves the frequency characteristics of the transmission line and enables playback. The sound is clear and transparent. However, the price is very expensive, and the brands of the audio cables mentioned above mostly produce fever speaker cables.

Audio Line:

The audio cable is used to connect the source device to the power amplifier. The sound quality of the sound line on the market is mainly gold-plated, silver, and elemental oxygen. The non-metallic carbon has a higher import volume, but its price is more expensive. Generally, it costs a few hundred yuan. Mainly American MONSTER STANDRDINTERLINK, AUDIO0UEST, SUPRA, M0NITERPC, SPACE&TIME, MISSION, PATRDNICS, VDH (Netherlands-Vanden Howe )and many more.

For the general popular type (below 10,000 yuan) audio equipment, there is no need to deliberately pursue the high quality of the wire, as long as the copper core signal line with a larger cross section is used. For better home theater audio equipment, you can consider using high-quality audio cables, such as fiber optic output and input interfaces on DVD video players and "AC-3" decoders, such as optical fiber transmission lines, which can improve the sound quality. Get a more obvious effect.

Audio cable: A set of audio cables is often two, divided into two channels, the ends of which are lotus heads (RCA heads).

Coaxial: Used to transmit multi-channel signals (Dolby AC-3 or DTS signals), similar to audio lines, because of the large amount of signals, connectors and lines are thicker than ordinary audio lines, generally used to connect DVD players with Amplifier.

Fiber optic cable: Also used to transmit multi-channel signals (Dolby AC-3 or DTS signals) for connecting DVD players to amplifiers.

Microphone cable: A two-core coaxial cable for connecting a power amplifier to a microphone. At present, the rise of wireless microphones, if not for special considerations, can be ignored when wiring, and wireless microphone applications will certainly become wider and wider.

The audio cable is basically not needed when wiring, because the audio source device and the power amplifier are often put together, these lines are very short, and the configuration can be done later.

Video line:

The video line is used to transmit video signals. It is used to connect media playback devices and display devices. The media playback devices have DVD players, HTPCs, (VCD players, video recorders are not mentioned), and video cables are as follows. :

AV cable: This is the oldest video cable for transmitting analog video signals. Both ends are lotus heads (RCA heads). Currently, DVD players and TV sets have such interfaces.

S-terminal line: The video line that appeared better than the AV line in previous years, the interface is round, similar to the PS2 mouse head;

Three-color difference line: A video cable with better quality than the S-terminal line, which transmits analog signals. It should be the best video line in the analog signal. Newer DVD players, high-end TVs, and home projectors will have this kind of interface.

VGA cable: It is also an analog signal video cable, which is most common in computers. Its signal has its own advantages compared with the color difference line. However, as the amount of video data increases, for example, to transmit 1920X1080P video signals in the future, the redundancy of the color difference lines It will be bigger. After the resolution exceeds 1600X1200, the VGA line quality is slightly shorter, and the length is slightly longer, which will cause snowflakes. Why do home theaters mention VGA cables? That's because HTPCs go into home theaters, and all projectors have a VGA port.

DVI line: The full name of Digital Visual Interface, the latest digital video line, transmits all digital signals with uncompressed technology, the maximum transmission speed is 8Gbps, and has received digital video signal lines supported by most manufacturers. The transmission speed of interfaces is up to 8Gbps. There are 24+1 (DVI-D), 24+5 (DVI-I) type, DVI-I supports simultaneous transmission of digital (DVI-D) and analog signal (VGA signal). Generally speaking, HTPC graphics card is generally DVI- I interface, and LCD, projector is DVI-D interface. DVI-I interface is compatible with DVI-D interface, but DVI-I plug can not insert DVI-D interface, why? Four more needle. But we still have a way to use a DVI-I to DVI-D converter.

HDMI cable: full name Hi-Definition Multimedia Interface, digital video cable updated than DVI, full digital signal transmission without compression technology, the maximum transmission speed is 3.95Gbps, HDMI in addition to transmitting video, also supports eight channels 96kHz or mono 192kHz digital audio transmission, but the devices that currently support HDMI are not too many. Its interface can be converted to the DVI interface (video signal part).

In summary, in the formation stage, we want to support all current display devices: ordinary TV, plasma, LCD TV, LCD cinema projector, DLP cinema projector, which lines should we choose? If you want to be compatible with all equipment, most Choose three lines, the most common VGA cable (the minimum support for all devices), the color difference line of the analog signal, and the HDMI cable.