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High Frequency Audio&Vedio Cable Keep The Best Connection May 26, 2017

The High frequency Audio&Vedio Cable has always been an important part of this or short or long lines, with thick and thin cores, as well as a variety of connectors that are responsible for the transmission of audio data. This article mainly introduces the High frequency Audio&Vedio Cable and related problems, only one purpose: the sound signal to achieve the best transmission effect.

In general, because many digital High frequency Audio&Vedio Cables use the same connectors as analog audio (such as the Cannon XLR, Lotus RCA, etc.), many people use analog cables to temporarily replace digital cables. Although it can also make do, but must be aware of this is very wrong.

Analog cables and digital cables have completely different impedance requirements. Analog cables vary in length from 30 to 90 ohms at different points of the cable. Impedance fluctuations do not affect the sound quality of analog audio.

This is terrible for digital audio, the digital audio signal is a very high frequency (about 3MHz) pulse wave, in order to accurately transmit the signal, the cable must be connected with the sending and receiving equipment, the entire cable impedance must be consistent. For example, the AES / EBU cable must display a constant 110 ohm impedance from one end to the other, which is why the AES / EBU cable is much more expensive than the appearance of a microphone cable.

What happens if you replace the digital cable with an analog cable?

First, because the impedance does not match, the cable will produce standing wave reflection, "pollution" signal, so that the outline of the pulse wave fuzzy. The pollution also comes from the distributed capacitance of the cable, which reduces the high frequency response of the cable and affects the rise time of the pulse.

Pulse waveform high and low voltage conversion of the signal to define the 0 and 1, if the wrong impedance and capacitance, the pulse signal is contaminated, the receiver on the interpretation of the signal will appear error, the emergence of time before and after the shift (Called jitter, jitter), thus reducing the quality of the audio, or even wrong code.

High frequency Audio&Vedio Cable without a microphone, synthesizer, mixer, monitor speakers and other equipment as a compelling shape, often a mess of the same shop floor. General users of the equipment by the heart, the cable is relatively sloppy, connected on the line, not pay attention to quality.

If the level of all equipment is generally low, the lack of cable is also not out; if the equipment in the studio are very high, poor quality cable has become the sound quality of the "bottleneck", we will follow it downgrade. It is necessary to invest in the cable replacement.

Analog High frequency Audio&Vedio Cable

Analog High frequency Audio&Vedio Cables can be roughly divided into three categories: microphone cable, guitar / line cable and speaker cable. Normally, the center of the High frequency Audio&Vedio Cable is a conductor, which is the carrier of the audio signal. The conductor is covered with a non-conductive plastic or rubber, and the outside is a shield formed by a conductor which, on the one hand, isolates the external interference and, on the other hand, constitutes the ground (circuit) of the signal.

The outermost layer of skin protects the inner layers and makes the cables durable. High frequency Audio&Vedio Cables generally use copper wire for the conductor, because it is low cost, good conductivity, more flexible. But the copper exposed to the air is easily oxidized and becomes a poor conductor of copper oxide, affecting the conduction of current.

Analog High frequency Audio&Vedio Cable using a typical number of plug-in form, the microphone is usually used card farm (XLR), line connection using large three-core (1/4 inch) or lotus (RCA), speaker cable connector is often bare copper, Sometimes with banana plugs or other plugs. When the plug socket is combined, the ductile gold-plated layer can fill the gap in the connection and maintain the best connection.

Cable shielding requirements

Many types of interference can affect the transmission of audio signals within the cable, so the cable needs to have good shielding performance. Common types of interference from the radio signal, English Radio-Frequency Interference, referred to as RFI.

If the cable to pick up the radio to send the signal, through the amplifier circuit may be detected when the amplification, mixed in the audio signal caused by interference. Shielded bad cable is like an antenna, it is easy to be ubiquitous radio interference. RFI is an electromagnetic wave, also belong to the electromagnetic wave interference source also motor coil, fluorescent lamp, neon and so on. Another common type of interference is electrostatic (electrostatic) interference, from the spark, electrostatic discharge and so on.