What is a HDMI used for and the solution to no sound on an external monitor connected via HDMI

May. 06, 2024 / Updated by Seraphina to Windows 10


"HDMI" stands for High-Definition Multimedia Interface. It's a technology that allows for the transmission of high-quality digital audio and video signals between devices, typically between a source device (such as a computer, Blu-ray player, or gaming console) and a display device (such as a TV or monitor). HDMI is commonly used to connect computers, gaming consoles, Blu-ray players, set-top boxes, and streaming devices to TVs, monitors, and projectors.


1. Advantages of HDMI

2. Types of HDMI

3. HDMI RF Modulator vs HDMI Modulator

4. Reasons and Solutions for HDMI No Sound

    1). Causes of HDMI No Sound

    2). Solution for HDMI-Connected Monitor Without Sound

1. Advantages of HDMI:

  • High-Definition Transmission: HDMI supports the transmission of high-definition video and audio signals, providing clearer and more lifelike images and sound effects.

  • Single Interface: HDMI transmits both video and audio signals through a single interface, simplifying the connection process and reducing cable clutter.

  • Digital Transmission: HDMI uses digital transmission technology, avoiding the distortion and interference that may occur with analog signal transmission, ensuring signal stability and quality.


  • Versatility: HDMI interfaces can connect various types of devices, including TVs, monitors, projectors, Blu-ray players, gaming consoles, and computers, making it highly versatile.

  • High Compatibility: HDMI standards have been widely adopted and developed, with almost all modern multimedia devices supporting HDMI interfaces, providing good compatibility and interoperability.

2. Types of HDMI:

1). HDMI Categories:

  • HDMI 1.4

  • HDMI 2.0

  • HDMI 2.1

2). Types of HDMI Cables:

  • Standard HDMI Cable

  • High-Speed HDMI Cable

  • High-Speed HDMI Cable with Ethernet

  • Premium High-Speed HDMI Cable

3). Types of HDMI Connectors:

  • HDMI Type A (Standard Size)

  • HDMI Type C (Mini HDMI)

  • HDMI Type D (Micro HDMI)

4). Features and Characteristics of HDMI:

  • Transmission of high-definition video and audio signals

  • Support for 4K resolution and high frame rate video

  • Provision of Audio Return Channel (ARC)

  • Support for High Dynamic Range (HDR)

  • Support for 3D video transmission

  • Provision of Ethernet channel functionality

5). Applications of HDMI:

  • Connection to televisions, monitors, and projectors

  • Home theater systems

  • Connection of gaming consoles, Blu-ray players, and computers

  • Audiovisual transmission for commercial and industrial purposes

  • Connection in automotive entertainment systems

3. HDMI RF Modulator vs HDMI Modulator:

1). HDMI RF Modulator:

  • An HDMI RF Modulator is a device used to convert High-Definition Multimedia Interface (HDMI) signals into Radio Frequency (RF) signals.

  • It is typically employed to convert HDMI signals into RF signals for distribution in traditional television signal transmission systems, such as cable TV networks or satellite TV networks.

  • HDMI RF Modulators enable users to distribute high-definition content to multiple televisions via RF signals, allowing playback on multiple screens in home, commercial, or other environments.

2). HDMI Modulator:

  • An HDMI Modulator is a device used to convert HDMI signals into other types of signals, such as Digital Video Broadcasting-Terrestrial (DVB-T) signals or fiber optic signals.

  • It is commonly utilized to convert HDMI signals into Digital Video Broadcasting-Terrestrial (DVB-T) signals for transmission in digital TV networks, enabling users to receive HDMI signals through digital TV receivers or TV tuners.

  • HDMI Modulators can also be employed to convert HDMI signals into fiber optic signals for transmission in specific applications in fields such as healthcare, aerospace, or military.


4. Reasons and Solutions for HDMI No Sound:

1). Causes of HDMI No Sound:

(1). Computer Volume Settings Issue:

The most basic reason for no sound on a computer may be incorrect volume settings. You can check if the volume is turned on by clicking on the volume icon in the bottom right corner of the computer screen. Avoid having the volume muted and adjust it to the optimal level.

(2). Audio Output Settings Issue:

In addition to adjusting the computer volume, ensure that the audio output settings on the computer are correctly configured. You can press "Win+R" to open "Control Panel", then navigate to "Hardware and Sound" to check if the sound playback options include HDMI and set this device as the default device.


(3). HDMI Connection Issue:

Connection issues also affect whether an HDMI-connected monitor outputs audio. If the HDMI cable connection is loose or damaged, it can result in no sound on HDMI. Try unplugging and replugging the HDMI cable to ensure it's secure. When in use, try to choose cables with guaranteed quality.


(4). Driver Issues:

If the above methods don't solve the problem, it may be due to issues with the computer's sound card driver. Check if the computer's sound card driver is installed or updated.

2). Solution for HDMI-Connected Monitor Without Sound:

If it's difficult to determine whether it's a sound card driver issue after checking, it's recommended to use "Driver Talent" software for updates. During the detection process, it can also identify if other drivers are functioning normally and perform timely updates and repairs.

Download Driver Talent

  • Open the Driver Talent software, click "Scan" to check if the Sound Card appears abnormal.

  • After scanning, choose the HDMI version to upgrade from all versions displayed.

  • Click "Download" on the right side.

  • Once the software is installed, simply restart the computer to apply the changes.


The above information covers the usage of HDMI, its types, and solutions to common issues like no sound on HDMI-connected external monitors. For other driver-related problems like network cards, graphics cards, Bluetooth, sound cards, printers, etc., you can use "Driver Talent" for detection and repair, as it supports driver download, installation, and backup, providing flexible driver management options.

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