What interface is hdmiarc?

hdmiarc is the audio transmission interface. HDMI refers to high-definition multimedia interface. It is a fully digital video and sound transmission interface that can send uncompressed audio and video signals. HDMI ARC is one of the upgrades of HDMI 1.4 version. While having all the advantages of HDMI, it also adds Audio return function. HDMI ARC is used for digital audio output, and can also be connected to a power amplifier that also supports the ARC function to transmit sound to the power amplifier.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

hdmiarc is the audio transmission interface. hdmi refers to the high-definition multimedia interface, which is a fully digital video and sound transmission interface that can send uncompressed audio and video signals. arc refers to the audio return channel, so hdmiarc supports the sound return function and is used for digital audio Output, you can also connect a power amplifier that also supports the arc function to transmit the sound to the power amplifier.

hdmi arc (audio return) interface introduction

HDMI is an all-media digital interface, which is more powerful than optical fiber coaxial More: higher bandwidth, supports 7.1 channels and Dolby Atmos, can transmit all-digital video signals and audio signals without compression at the same time, just connect the player and TV with only one HDMI cable, you can enjoy clear images at the same time For picture and stereo sound, you don’t need to worry about too many wires blocking the system, nor will you lose the picture quality, sound quality and performance. The optical fiber coaxial interface can only support 5.1 channels and can only transmit audio signals. Achieve audio and video synchronization.

Extreme convenience and high quality, powerful functions, and almost no sound weaknesses make HDMI now the preferred connection for all AV equipment. At the same time, it is constantly being upgraded. HDMI ARC is one of the upgrades of HDMI1.4 version.

It can be said that HDMI is the father of HDMI ARC. HDMI ARC is a functional upgrade of HDMI. While having all the advantages of HDMI, it also adds audio return function. HDMI ARC (audio return function) refers to the transmission of audio signals from the TV to the power amplifier, TV speakers, etc. As a monitor, the TV is generally a terminal that uses HDMI to receive video and audio signals and does not transmit signals externally. With the development of technology, the TV itself can often serve as a 5.1 or even 7.1 channel signal source. We need the TV to transmit the sound to the amplifier and speakers to amplify the sound. Because the audio signal transmission direction is opposite to the normal situation, it is called return transmission.

What exactly is HDMI ARC used for?

Mainly provides sound quality improvement and three conveniences in home audio and video entertainment:

1. High-quality return transmission of TV audio signals

The HDMI interface without ARC function can only allow the power amplifier to transmit audio and video signals to the TV, but cannot transmit the TV signal to the power amplifier (i.e. audio return). In this case, if we want to transmit the sound of the TV to the power amplifier and sound amplification, we need to connect optical fiber or coaxial.

With the ARC (audio return) function, the TV can output audio signals to power amplifiers and audio equipment through HDMI. As mentioned just now, HDMI has a higher bandwidth and can support 7.1 channels and panoramic sound, and the sound quality is better.

# Second, in the traditional connection method, users who want to switch signal sources at will can save an audio cable.

The traditional home audio and video connection method is to use HDMI to connect the player-power amplifier/sound wall-TV. The player synchronously transmits the audio and video signals to the power amplifier, and the power amplifier leaves the audio signal for decoding and playback. , the video signal is transmitted to the TV, audio and video are synchronized, two HDMI cables are used, no audio return is required.

But now TVs are often also signal sources. With this traditional connection method (still the mainstream connection method at present), if you don’t have the ARC function and want to connect the player and the TV If you want to switch sources at will, you need to add an audio cable between the TV and the amplifier. With the ARC (Audio Return) function, the TV can directly output audio signals to the power amplifier and audio equipment through the original HDMI cable, eliminating the need for additional audio cables between the TV and the power amplifier. It not only makes it more convenient to use, but also reduces the possibility of system obstruction caused by too many wires. The audio quality and sound channels are higher than those originally using optical fiber coaxial.

##3. Change the traditional connection method

The traditional connection method is what was mentioned in the previous point From player to amplifier to TV, the emergence of ARC allows users to change the connection method and choose as they wish.

When there was no ARC function before, it can be said that the player-power amplifier-TV connection must be used instead of the player-TV-power amplifier connection, because the TV needs to use HDMI ARC or optical fiber coaxial to transmit the audio signal to the power amplifier. HDMI without ARC function cannot transmit.

When there is no ARC, the result of such a connection is that the sound quality and decoding format will be worse than HDMI transmission, and the second is that the audio and video signals will be out of sync. The video signal from the player is directly sent to the TV through HDMI, but the audio signal has to go through the TV and then to the power amplifier and speakers through optical fiber coaxial, so it is generally not connected like this.

With the ARC function, you can connect freely and use any method you want. The sound quality of audio and video synchronization is better, and the operation difficulty of home audio and video equipment is also easy. of decline.

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