Faced with the dense interface behind the AV amplifier, many newcomers will encounter this or that problem when they use it. Today we will introduce you to the more common AV video and audio ports. I hope that you can set up and maintain a home theater. Helped.
Various interfaces behind AV amplifiers
Audio:
Digital Coaxial, standard SPDIF (Sony / Philips Digital InterFace), was jointly developed by Sony and Philips to transmit digital audio signals with a maximum transmission speed of 10Mbps. The coaxial cable has two concentric conductors, and the conductor and the shield share the same axis. The coaxial cable is a copper wire conductor isolated by an insulating material with an impedance of 75 Ω. On the outside of the inner insulating material is another layer of ring conductor and its insulator. The entire cable is sheathed with polyvinyl chloride or Teflon material. live. The advantage of the coaxial cable is that the impedance is stable and the transmission bandwidth is high, which ensures the quality of the audio. Although the standard connector of the coaxial digital cable is a BNC connector, the coaxial digital wire on the market mostly uses an RCA connector.
The RCA cable transmits analog signals, which is the most common audio connection method at present. It is usually used to connect the signal source to the power amplifier. If you are using the front and rear equipment, the front and rear stages are also used before. To connect. Each RCA cable is responsible for transmitting the audio signal of one channel, so usually this wire is sold in one pair. For multi-channel systems, the same number of RCA wires are used depending on the actual number of channels. The right channel of the stereo RCA audio interface is generally marked in red and the left channel is marked in blue or white.
Optical fiber audio interface
Optical fiber audio interface TosLink, full name Toshiba Link, which was developed and set by Toshiba Corporation of Japan earlier, uses Optical for the logo on the back panel of audio-visual equipment. The fiber optic connection can achieve electrical isolation and prevent digital noise from being transmitted through the ground, which helps to improve the signal-to-noise ratio of the DAC. The optical fiber itself has a very low signal attenuation rate and a fast transmission speed of substantially 155 Mbps. The fiber-connected signal undergoes two conversions between the transmitter and the receiver, which produces a timing jitter error (Jitter) that severely affects the sound quality. Common materials used in the manufacture of optical fibers are plastic, quartz, glass, and the like. Because of the difference in materials, the difference in price can be caused, and the only drawback of the fiber-optic audio interface is that it cannot be bent excessively, so be careful when using it.
Common AV port full contact (2)
Balanced analog audio interface
The Balanced Analog Audio interface uses two channels to transmit signals with the same signal and opposite phases. The receiving device subtracts the two sets of signals, and the interference signal is cancelled out, thereby obtaining a high quality analog signal. Balanced analog audio typically uses an XLR interface and a large three-pin interface. The XLR, commonly known as the card head, consists of a three-pin plug and a locking device. Thanks to the locking device, the XLR connection is quite secure. The large three-core interface uses a 6.35 mm diameter plug, which has the advantage of being wear resistant and suitable for repeated insertion and removal. Balanced analog audio connections are found primarily in advanced analog audio equipment or professional audio equipment.
The speaker cable is connected between the power amplifier and the speaker, and is a wire for transmitting an analog audio signal to make the speaker sound. There are mainly bare wire connections, banana plugs and Y plugs. Different plugs or bare wires are used to facilitate the connection habits of different users. At the same time, different connection plugs are installed because of the different materials used for the wires. The connection of the speaker cable mainly requires the plug to be in close contact with the socket of the device, thereby improving transmission performance and stability.
video:
Other ports:
The full name of the RS-232C standard (protocol) is the EIA-RS-232C standard, which is the most common serial interface. RS-232C standard interface has 25 lines, 4 data lines, 11 control lines, 3 timing lines, 7 spare and undefined lines, only 9 are commonly used, and are often used with 25-pin D-sub ports. Used together, the maximum transmission rate is 20kbps, and the cable length is up to 15 meters. The RS232C port is used to input computer signals into the projector.
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