[Home Theater Network] Before we introduced "Common Home Theater Signal Line Classification and Connection Use", it may not be easy for an entry-level white user to be too professional. Today we will introduce the common audio and video electronic products in life. Audio interface, popularize the basics. It is still very important to know the common audio interface. Especially when it comes to digital audio products, the first thing that is often faced is the connection. In addition to the familiarity of the power cable, there are a lot of dense audio interfaces. Some people may not know how to wire them. These interfaces are not only different in function, but the more troublesome thing is that although the functions are different, the appearance is the same, which causes a lot of trouble for many primary users. The author has always emphasized that before using digital products, it is necessary to develop the habit of reading the manual. Only by understanding the manual can the function of the machine be understood in the actual operation, and the unnecessary operation of the machine due to misoperation is avoided. damage. But now many people are reluctant to take the time to read the manual, so there will be confusion when faced with things like distinguishing audio interfaces. In fact, if you are constantly in contact with these devices, you will gradually become familiar with the audio interfaces that look very complicated. Usually, there will be corresponding English labels on the side of the interface. If you encounter a relatively unfamiliar device and have some new features. , then you need to read the instructions carefully to identify and operate. This time we introduce some common audio interfaces for you. What needs to be explained here is that the interface we are talking about actually includes a discussion of the two aspects of "interface" and "connector", which we usually call "joint" or "connector". plug". "Interface" defines the physical characteristics of the connection between electronic devices, including the frequency and strength of the transmitted signal, and the type and number of corresponding connections, as well as the structural design of the plug and socket; and the "connector" is physically A device that implements the connection between devices. TRS interface for analog audio interface Speaking of the TRS interface, the average person may not know what it is at first sight, but as long as the object is placed in front of it, everyone knows what it is. In fact, the most we see in daily life is the TRS interface. Its connector appearance is cylindrical. It usually has three sizes 1/4" (6.3mm), 1/8" (3.5mm), 3/32" (2.5mm). ), the most common one is the 3.5mm size connector. Different size TRS connectors The 2.5mm TRS connector has been popular in mobile phone headsets, but it is rare now. The headphone jack is basically dominated by the 3.5mm interface. The 6.3mm connector is more common in many professional equipment and high-end headphones, but now many high-end headphones have gradually changed to 3.5mm connectors. The meaning of TRS is Tip (signal), Ring (signal), and Sleeve (ground), which represent the three contacts of this joint. We see three sections of metal columns separated by two pieces of insulating material. Therefore, 3.5mm joints and 6.3mm joints are also known as "small three cores" and "big three cores". "big three core" structure The TRS interface is a circular hole with an internal corresponding to the joint and three contacts, which are also separated from each other by an insulating material. Some people say that there is no four-pin plug? Yes, we have a four-pin plug that we see on headphones or a Walkman. The extra core is used to transmit voice signals or control signals. In addition, a four-core 3.5mm plug for headphones is used to transmit balanced signals. The 6.3mm "big three core" plug can be used to transmit balanced or unbalanced stereo signals, which means it can transmit balanced signals like the XLR balanced interface we will talk about later, but the cost of making such a balanced line is relatively low. High, so it is generally only used in high-end professional audio equipment. Two core 6.3mm TRS electric guitar line Of course, since you can add a core, you can also reduce the core. The two-core TRS connector can be used to transmit unbalanced mono audio signals. For example, the electric guitar cable is a two-core TRS cable. Therefore, from the appearance of the TRS interface, we do not know whether it supports balanced transmission; from the core number, we can not determine whether the four-core and above TRS connectors support balanced transmission, the specific situation needs to see the equipment. RCA interface for analog audio interface RCA interfaces are also very common in our daily lives, and are basically available on speakers, TVs, amplifiers, DVD players and other devices. It is named after the Radio Corporation of America. In the 1940s, the company introduced this interface to the market and used it to connect phonographs and speakers. Therefore, it is also known in Europe. PHONO interface. The joint name we are more familiar with is the "Lotus Head". The RCA interface is very common in our daily lives. RCA connector called "Lotus Head" The RCA interface uses a coaxial transmission signal. The central axis is used to transmit signals, and the outer layer of the contact layer is used for grounding. Each RCA cable is responsible for transmitting the audio signal of one channel, so the RCA cable can be used according to the actual needs of the channel. For example, to set up two-channel stereo, you need two RCA cables. XLR interface for analog audio interface The XLR interface is also known as the "Kanonkou" because Cannon Electric, founded by James H. Cannon, is its original manufacturer. Their earliest product was the "cannon X" series, and later the modified product added a locking device (Latch), so an "L" was added behind the "X"; then a rubber seal was added around the metal contacts of the joint. (Rubber compound), then added an "R" after the "L". People put together three uppercase letters and call this connector "XLR connector". More common three-core XLR interface
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