【 Weak current College 】 5 audio interface-

Along with the audio and video technology continues to develop and progress, in addition to HD video brings Visual impact, the audio connection quality is also greatly improved, can give you more lifelike scene effects. Then, the current mainstream audio interface what?
RCA analog audio


RCA connector is often say Lotus head, using the RCA cable transmission of analog signals is by far the most common audio connection. Each root RCA cable for transferring audio signals in one channel, stereo signal, you need to use a pair of wires. For multichannel systems, according to the actual number of channels with the same number of cables. Stereo RCA audio interface, generally the right channel, with a red label is the left channel in blue or white callout.

S/PDIF

S/PDIF (Sony/PhilipsDigitalInterface, Sony and Philips digital interface) is managed by SONY Corporation and PHILIPS Corporation jointly developed by a digital audio output connector. The interface is widely used in CD players, sound cards and household appliances, and other devices, CD audio quality can be improved, giving us more pure auditory effect. The interface is a digital signal, therefore, does not like analog signal so disturbed and reduce the audio quality. It should be noted that, S/PDIF interface is a standard, coaxial digital interface and light interface belongs to S/PDIF interface.

Digital coaxial



Digital coaxial (DigitalCoaxial) is the use of S/PDIF output digital audio interface. Coaxial cable with two concentric conductor, conductor and shield share the same axis. Coaxial cable is made of insulating material isolated copper conductor, impedance of 75 ohms, in the inner layer of insulating material of the outer ring is another layer, the conductor and insulator by the entire cable PVC or Wrap Teflon material sheathed. The advantages of the coaxial cable is impedance stability, transmission bandwidth to ensure that the audio quality. Although the standard coaxial digital cable BNC connector for the connector, but the market of coaxial digital wire use RCA connector.

Fibre


Fiber optic (Optical) to a light pulse to transmit digital signals, their material to glass or acrylic. Fibre also uses the S/PDIF output, which is the bandwidth of the signal attenuation of small, often used to connect a DVD player and AV amplifier that supports PCM digital audio signal, Dolby and DTS audio signal.

Balanced analog audio


And RCA analog audio cables directly transmit sound completely different manner, balanced analog audio (BalancedAnalogAudio) interface using two channels are transmitted signal same and phase contrast signal. The receiving device will both sets of signals subtraction, the interfering signal is offset, in order to get high-quality analog signals. Balanced analog audio on XLR connectors and are usually large three-core interfaces. XLR commonly known as the card you have three-pin, Plug and locking device. As a result of the locking mechanism, XLR connection is tight. Big three-core interface is a diameter of 6.35 mm plug, its advantages are wear-resistant, suitable for repeated plug. Balanced analog audio connection occurred mainly in advanced analog audio equipment or professional audio equipment.