In addition to the visual impact that high-definition video brings, the audio quality has also been greatly improved, which can bring you more realistic live effects. So, what are the current mainstream video interfaces? Teacher Hua will explain the common audio interfaces on the market one by one.
1. RCA analog audio
The RCA connector is often referred to as the lotus head. The use of RCA cables to transmit analog signals is currently the most common audio connection method. Each RCA cable is responsible for transmitting one channel of audio signals, so a pair of cables is required for stereo signals. For a multi-channel system, the same number of cables must be matched according to the actual number of channels. For stereo RCA audio interfaces, the right channel is generally marked in red, and the left channel is marked in blue or white.
2. S/PDIF
S/PDIF (Sony/Philips Digital InteRFace, Sony and Philips Digital Interface) is a digital audio output interface jointly developed by SONY and PHILIPS. This interface is widely used in equipment such as CD players, sound cards and household appliances, which can improve the sound quality of CDs and give us more pure auditory effects. The interface transmits a digital signal, so it will not be interfered like an analog signal and degrade the audio quality. It should be noted that the S/PDIF interface is a standard, and both the coaxial digital interface and the optical interface belong to the category of the S/PDIF interface.
3. Digital Coaxial
Digital Coaxial is an interface that uses S/PDIF interface to output digital audio. A coaxial cable has two concentric conductors, and the conductor and the shield share the same axis. A coaxial cable is a copper conductor isolated by insulating material, with an impedance of 75 ohms. Outside of the inner insulating material is another layer of ring conductor and its insulator. The entire cable is sheathed by polyvinyl chloride or Teflon material. Wrap around. The advantages of coaxial cable are stable impedance, high transmission bandwidth, and guarantee the quality of audio. Although the standard connector of the coaxial digital cable is a BNC connector, most of the coaxial digital cables on the market use RCA connectors.
4. Optical fiber
Optical fiber (Optical) transmits digital signals in the form of light pulses, and its material is mainly glass or plexiglass. Optical fiber also uses S/PDIF interface output, which has high bandwidth and low signal attenuation. It is often used to connect DVD players and AV power amplifiers, and supports PCM digital audio signals, Dolby and DTS audio signals.
5. XLR interface
It is completely different from the way that the RCA analog audio cable directly transmits sound. The Balanced analog audio interface uses two channels to transmit the same signal but opposite phase signals. The receiving end equipment subtracts these two sets of signals, and the interference signal is cancelled out, thereby obtaining a high-quality analog signal. Balanced analog audio usually uses XLR interface and big three-core interface. XLR, commonly known as XLR head, consists of a three-pin plug and a locking device. Thanks to the locking device, the XLR connection is quite reliable. The large three-core interface uses a plug with a diameter of 6.35 mm, which has the advantage of being wear-resistant and suitable for repeated insertion and removal. Balanced analog audio connections mainly appear on advanced analog audio equipment or professional audio equipment.
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