【 Weak current College 】 audio cable in the audio signal transmission in the importance of (a)

Whether it's music production equipment or a sound playback device, audio cable has always been an important part, but quite a lot of people do not pay attention to it. This or short or long lines, the rough, has a small core, and all kinds of joints, play audio data transfer, and if a good music playback devices, does not match a proper audio cable, you will not be able to achieve the best playback effect, sometimes even bear to listen to "miserable." This article describes audio cables and related issues, there is only one purpose — to make the best transmit sound signals.
Digital audio cable
In General, because many digital audio cables use the same with analog audio connectors (such as cards, Lotus mouth agricultural XLR, RCA), many people with analog cable temporary place of digital cable. Although they can improvise, but you must realize that this is very wrong.
Analog cable and digital cable is a completely different analog cable impedance requirements, because the length, in cable points, impedance in 30 to 90 Ohm impedance fluctuation between changes, and will not affect the sound quality of analog audio. And this is for digital audio, digital audio signal frequency is very high (approximately 3MHz) of pulse wave, in order to accurately transmit signals, cable must be sending and receiving equipment match, the entire cable impedance must be consistent. For example, AES/EBU cable must be the other end from one end to show constant 110 Ohm impedance, which is also the AES/EBU cable than appearance almost microphone cable expensive many causes.
If you are using analog cable temporarily replace a digital cable? first because the impedance mismatch, the cable will have a standing wave reflection, "pollution" signal, the outline of the pulse wave. Pollution also from cable distribution capacity, it can reduce cable of high-frequency response, impact pulse rise time. Pulse waveform in high and low voltage conversion defined out signal 0 and 1,if you were not the correct impedance and capacitive effects has been polluted, pulse signal, the receiver of the signal interpretation error occurs, a time before and after the offset (called a flutter, Jitter), which reduces the audio quality, even wrong code appears.
Making computer music cannot be separated from the rest of the audio cable, they do not have a microphone, synthesizers, sound mixer, za, and other equipment that has a striking appearance, often looks like spread all over the floor. The average user on the device, compare careful careless, connecting cable comparison on the line, not much attention to quality. If all devices are generally lower, cable digital out insufficient also; if Studio equipment is advanced, low-quality cable became the sound of the "bottleneck", we will follow it degraded. Then replace the cable investment is necessary.
Analog audio cable
Analog audio cable can roughly be divided into three categories: microphone cable, guitar/line cable and loudspeaker cables. Typically, the center part of the audio cable is a conductor, is the carrier of the audio signal. Conductor outside covered with non-conductive plastic or rubber, and the outside is made up of a conductor, which on the one hand, the shield is isolated from the external interference, on the other hand, constitute a signal ground wire (loop). The outermost layer of the skin can protect the internal layers so that the cable is durable. Audio cable for general use copper conductor, because it cost low, the electrical conductivity is good, more flexible. However exposed to air oxidation of copper easily and become poor conductor copper oxide, affect current conduction.
Analog audio cables use the typical form of several patch, microphone typically use card administrative (XLR), line connections using large three-core (1/4 inch) or Lotus mouth (RCA), speaker cable connector often bare copper wire, sometimes with banana plugs or other plugs. Plug and socket binding, full ductility of gold-plated layer can fill the gap in the connection, keep the good connections.