Understanding the Audio Codecs in the Audio Module

In the previous article, we learned what the Bluetooth audio protocol is. The Bluetooth audio module launched by MuYu covers all Bluetooth audio protocols and supports most audio codecs. What is the specific audio decoding, then in this article, let’s take a look at the audio codecs used in the Bluetooth audio module.

Bluetooth Audio Codecs

SBC (Subband Coding): SBC is a basic audio codec commonly used in Bluetooth audio streaming. It offers moderate audio quality and is widely supported by Bluetooth devices. SBC is a mandatory codec for Bluetooth audio, but it doesn’t provide the same level of audio performance as some of the other codecs on this list.

AAC (Advanced Audio Coding): AAC is a popular audio codec known for its improved audio quality compared to SBC. It provides better compression efficiency, resulting in higher fidelity audio at lower bitrates. AAC is widely used in applications like music streaming, digital radio, and online video.

aptX: aptX is a proprietary audio codec developed by Qualcomm. It offers higher audio quality and lower latency compared to SBC. aptX is commonly found in Bluetooth headphones, speakers, and other devices. It uses a more efficient compression algorithm to deliver better sound quality.

aptX HD: aptX HD is an enhanced version of aptX, supporting high-definition audio. It provides even better audio quality compared to standard aptX, especially for high-resolution audio content. aptX HD is designed to deliver near-lossless audio over Bluetooth connections.

aptX Low Latency (aptX LL): aptX LL is another variant of aptX that focuses on reducing audio transmission delay. It is optimized for applications where low latency is critical, such as wireless gaming or watching videos. aptX LL minimizes the delay between audio playback and the corresponding video or game action.

LDAC: LDAC is a proprietary audio codec developed by Sony. It is designed to transmit high-resolution audio wirelessly over Bluetooth connections. LDAC supports a higher bitrate compared to other codecs, allowing for better audio quality with less compression.

LC3 (Low Complexity Communication Codec):  LC3 is an audio codec designed for low-complexity communication and voice applications. It is an open standard codec developed by a consortium of companies including Fraunhofer IIS, Ericsson, Nokia, Dolby, and others.The primary goal of LC3 is to provide high-quality audio transmission while keeping the computational complexity low. It achieves this by utilizing advanced audio coding techniques that allow for efficient compression and decompression of audio data. LC3 offers a good balance between audio quality and low bitrate, making it suitable for various communication applications.LC3 is particularly well-suited for voice-over-IP (VoIP), mobile communications, and other low-bandwidth scenarios where efficient audio transmission is crucial. It provides low latency, which is important for real-time communication, and it offers adjustable bitrate configurations to adapt to different network conditions and bandwidth limitations.The LC3 codec has gained attention for its ability to deliver high-quality audio at low bitrates, allowing for efficient use of network resources while maintaining satisfactory audio fidelity. It has the potential to enhance the quality of voice communication over various platforms and devices.

These codecs vary in terms of audio quality, compression efficiency, latency, and compatibility. The choice of codec depends on the devices involved and the specific requirements of the audio application.The Bluetooth audio module developed by MuYu supports the above audio codecs for your choice. For more needs, please contact us.


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