Select the audio and video transmission cable technology - video, transmission, cable - electric industry

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Click to see more exciting information 1. Cable type Cable as used in many different environments, which seem in appearance from the big difference. However, whatever type of cable, they are as a signal transmission conductor. These different types of cable, the transmission quality of the performance of different signals have different, except in some special applications, the current audio and video transmission cables used in general to a single wire, twisted pair, coax and fiber. 1.1. Single wire Single cable wire is the most basic type (such as wire), which consists of one or a group being Plastic Protective layer surrounding the wire composition, this cable is widely used for transmission of low frequency signals, such as Power supply , Audio, computer ID code. 1.2. Twisted pair Twisted pair is a generic term, the number of wires and strands of the type and there is no limit, but the structure of the cable are only two types: with a shielded twisted-pair network (STP: ShieldedTwistedPair) and without shielded twisted-pair network (UTP: UunshieldedTwistedPair). Twisted pair common in the telecommunications, Internet, widely used in professional audio, this cable consists of two or more than two separate, mutually insulated cable composed of continuous strands, each strand is one of two cables called the group, transfer impedance generally 100_, the diameter of standard single conductor in 20AWG (American Wire Standard: 0.91mm) to 24AWG (0.61mm) between. Twisted-pair cable is a relatively inexpensive, each group of wires with the same anti-jamming capability, can effectively inhibit the external electromagnetic interference (EMI), also effectively shield the transmission signal to the external electromagnetic interference. UTP cable most commonly used in telecommunications transmission and computer network environment, according to the type of strands were divided into five categories, over five and six cables, generally up to 100Mbps (100 million digits per second) transmission rate. STP cable in the lead group to increase the external layer of woven metal mesh or foil, and help to improve the signal suppression outside the impact of radio waves. STP cable to the metal shell of each connector must maintain a good network of contacts with the shield. 1.3. Coaxial cable Coaxial cable (Coaxial) is a compound consisting of two conductors, as shown below: coaxial cable center conductor for the transmission signal, metal screen plays two roles: one as a signal of the public ground for the signal to provide current loop, and second, as a signal shielding net suppression of electromagnetic noise on the signal interference. Center conductor and shield of polypropylene mesh between half-foam insulation between the cable insulation determines transmission characteristics, but also effectively protected the middle of the wire. Coaxial cables are widely used in audio and video, or radio frequency transmission, transfer impedance is generally 75_, has become the video standard impedance (Early also use 50_ impedance characteristics of video transmission). Quality standard coaxial cable generally more expensive than twisted pair, coaxial cable and reliable because of the physical characteristics, can provide excellent audio and video performance. Signal frequency, resolution and the effective transmission distance cable systems in the audio and video played a decisive role. 1.4. Fiber Fiber optic cable (OpticCable) signals the best choice for long distance transmission, optical transmission is a replacement based on the photoelectric conversion Electronic Transmission techniques.

Select the audio and video transmission cable technology - video, transmission, cable - electric industry

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