What is coaxial audio?

Coaxial audio is an audio interface that has both input and output functions. Unlike previous audio interfaces, it integrates the microphone (input interface) interface with the headphone or audio (output interface) interface.

Coaxial audio interface (Standard) is SPDIF (Sony/Philips Digital InterFace). It is jointly developed by Sony Corporation and Philips. Coaxial is used on the back of audio-visual equipment to provide digital audio signal transmission. . Its connector is divided into RCA and BNC. The digital coaxial interface uses a coaxial cable with an impedance of 75Ω as the transmission medium. The advantage is that the impedance is constant and the transmission band is wide. The high-quality coaxial cable has a bandwidth of up to several hundred megahertz. Coaxial digital transmission line standard connector using BNC head, the impedance is 75Ω, with 75Ω coaxial cable, can guarantee a constant impedance, to ensure the correct signal transmission. That is to say, in the transmission of the wire, the 75-ohm coaxial wire suitable for transmitting high-frequency digital signals should be used as a matching standard.