What Is LHDC?
LHDC – which stands for Low Latency High-Quality Audio Codec, though it is sometimes also expanded as Low-latency Hi-Definition Codec – is a Bluetooth audio codec developed by Savitech, a Taiwanese semiconductor company. It supports audio transmission at bitrates up to 900 kilobits per second (kbps) over Bluetooth, placing it in direct competition with Sony’s LDAC as one of the highest-quality wireless audio codecs available.
What makes LHDC notable is not just its high bitrate but its emphasis on low latency alongside high quality. While many high-bitrate codecs sacrifice responsiveness for fidelity, LHDC is designed to keep the delay between source and playback as low as possible, making it suitable not only for music listening but also for video and casual gaming. It has been adopted primarily in the Chinese and Asian markets and is growing its global footprint as more chipset manufacturers integrate support.
In-Depth
The Problem LHDC Solves
Standard Bluetooth audio codecs face a fundamental tension: more data means better audio quality, but more data also means more processing time and more risk of transmission errors. The baseline SBC codec keeps things simple at around 328 kbps, sacrificing audio fidelity for reliability. Proprietary codecs like LDAC push the bitrate up to 990 kbps for better quality, but at the cost of increased latency and reduced connection stability in congested wireless environments.
LHDC was developed to find a better balance point on this spectrum – delivering audio quality that rivals LDAC while maintaining lower latency and good connection stability. Savitech designed the codec from the ground up with modern Bluetooth chipsets in mind, optimizing for the processing capabilities and power constraints of contemporary wireless audio hardware.
How LHDC Works
LHDC uses a psychoacoustic coding model similar in concept to other lossy codecs but with proprietary optimizations for Bluetooth transmission.
Perceptual coding. Like all lossy audio codecs, LHDC analyzes the audio signal and identifies components that are less perceptible to human hearing. It allocates fewer bits to these “masked” components and more bits to the elements that matter most to the listener. The specific algorithms and frequency band allocation are Savitech’s proprietary work.
Scalable bitrate. LHDC supports multiple quality tiers:
- 900 kbps. The maximum quality mode, supporting 24-bit/96kHz audio. This is the mode that qualifies for Hi-Res Audio Wireless certification from the Japan Audio Society.
- 600 kbps. A balanced mode with excellent quality and improved connection stability.
- 400 kbps. A lower-bitrate mode that still outperforms SBC and maintains good fidelity.
Like LDAC, LHDC can adapt its bitrate dynamically based on connection quality, dropping to a lower tier when interference threatens stability and scaling back up when conditions improve.
Low latency mode (LHDC-LL). This is where LHDC distinguishes itself most clearly. The LHDC Low Latency variant is designed to achieve audio delay under 30 milliseconds in ideal conditions – significantly lower than LDAC’s 200–300ms typical latency. This makes LHDC-LL one of the best Bluetooth codecs for watching video without lip-sync issues and for casual gaming where audio delay is distracting.
LHDC Versions
The codec has evolved through several versions:
LHDC V1/V2. The original releases, supporting up to 400 kbps. These were capable but did not reach the hi-res bitrate threshold.
LHDC V3. A major upgrade that pushed the maximum bitrate to 900 kbps, added 24-bit/96kHz support, and enabled Hi-Res Audio Wireless certification. This is the version that positioned LHDC as a genuine LDAC competitor.
LHDC V4. The latest iteration, which continues to refine the codec’s efficiency and adds improvements to the adaptive bitrate algorithm and error correction.
LHDC V5. Recently announced, further enhancing quality and efficiency while maintaining the codec’s low-latency advantage.
LHDC vs. LDAC: A Practical Comparison
Both codecs target the same goal – hi-res quality audio over Bluetooth – but they approach it differently.
Maximum bitrate. LDAC reaches 990 kbps; LHDC reaches 900 kbps. The 90 kbps difference is unlikely to be audible in practice.
Latency. This is LHDC’s biggest advantage. LHDC-LL achieves sub-30ms latency in ideal conditions, while LDAC typically sits at 200–300ms. For music-only listening, latency is irrelevant. For video and gaming, the difference is dramatic.
Ecosystem support. LDAC has a significant head start. It is built into Android AOSP and supported by a vast number of headphone and speaker manufacturers globally. LHDC adoption has been concentrated in the Chinese market (where it is supported by brands like Huawei through the HWA alliance, as well as numerous Chi-Fi IEM brands) and is gradually expanding internationally.
Source device support. LDAC is available on essentially all Android phones via AOSP. LHDC support depends on the phone’s Bluetooth chipset – it is commonly found on devices using certain MediaTek or Qualcomm chipsets, and on Huawei’s HarmonyOS devices. Support is growing but is not yet as universal as LDAC.
Sound quality. In blind comparisons, LHDC at 900 kbps and LDAC at 990 kbps are very close in quality. Both preserve significantly more detail than SBC or AAC, and both approach the quality of a wired connection for most listeners. Subjective preferences between the two are likely due more to implementation differences in specific devices than to inherent codec superiority.
LHDC vs. aptX Adaptive
aptX Adaptive from Qualcomm is another high-quality Bluetooth codec that competes in the same space.
Bitrate. aptX Adaptive scales up to around 420 kbps in its original version, though newer implementations on Snapdragon 8-series chips push higher. LHDC at 900 kbps significantly exceeds this.
Latency. aptX Adaptive includes a low-latency mode targeting around 50–80ms. LHDC-LL targets under 30ms, giving it an edge for latency-sensitive applications.
Platform. aptX Adaptive requires a Qualcomm Bluetooth chipset on both ends (source and receiver). LHDC is chipset-agnostic in principle, though it requires specific support from the Bluetooth stack.
Where You Will Find LHDC
LHDC has strongest adoption in the following areas:
Chinese and Asian headphone brands. Many IEM and TWS earphone manufacturers from China, Taiwan, and Korea support LHDC, especially brands that cater to audiophile-oriented consumers. If you follow the “Chi-Fi” IEM scene, LHDC is a common feature.
Huawei and HWA Alliance. Huawei adopted LHDC under the “HWA” (Hi-Res Wireless Audio) branding for their devices. Huawei phones and tablets support LHDC natively, and the HWA alliance has grown to include numerous audio product manufacturers.
Certain Android phones. Some phones with MediaTek chipsets include LHDC support in their Bluetooth stack. Availability varies by manufacturer and region.
Portable DAC/amps with Bluetooth. Several portable DAC/amp products include LHDC as one of their supported Bluetooth receiving codecs, alongside LDAC and aptX.
The LE Audio Factor
The emerging LE Audio standard with its LC3 and LC3plus codecs presents a long-term question for proprietary codecs like LHDC (and LDAC). LC3plus achieves excellent quality at efficient bitrates and is part of an industry-wide standard rather than a proprietary codec. As LE Audio adoption grows, the need for third-party hi-res codecs may diminish. However, that transition will take years, and LHDC remains one of the best options available today for high-quality, low-latency Bluetooth audio.
How to Choose
1. Check Compatibility on Both Ends
Like all Bluetooth audio codecs, LHDC requires support from both your source device and your headphones. Before buying LHDC-capable headphones, verify that your phone or player supports LHDC output. If you use a Huawei device or certain MediaTek-based phones, you are likely covered. If you use a Samsung, Google Pixel, or other mainstream Android phone, check the Bluetooth codec options in developer settings – LHDC may or may not be listed depending on your chipset and firmware.
2. Prioritize LHDC If Latency Matters to You
If you watch a lot of video on your phone, play mobile games, or are sensitive to audio-visual sync issues, LHDC-LL’s sub-30ms latency is a compelling advantage over LDAC and most other high-quality codecs. The combination of hi-res quality audio and genuinely low latency is LHDC’s strongest differentiator. If you only listen to music, the latency advantage is less relevant, and LDAC’s broader compatibility may be more practical.
3. Do Not Overthink the Codec Wars
LHDC at 900 kbps, LDAC at 990 kbps, and aptX Adaptive at its highest tier all deliver excellent wireless audio quality. The differences between them are smaller than the differences caused by your headphones’ tuning, your DAC’s implementation, or your source material’s quality. Choose headphones that sound great to you, check which high-quality codecs your phone supports, and use the best one available in your setup. The codec is important, but it is one piece of a larger puzzle.
The Bottom Line
LHDC is a serious high-quality Bluetooth audio codec that offers a compelling blend of near-hi-res sound quality and genuinely low latency. At 900 kbps, its audio fidelity rivals LDAC, and its LHDC-LL variant achieves latency figures that make it one of the best codecs for video and gaming alongside music. Its ecosystem is smaller than LDAC’s, with adoption concentrated in the Asian market and Huawei’s device ecosystem, but it is expanding. If your source device supports it and you value low latency alongside high quality, LHDC is an excellent codec that deserves consideration alongside the more familiar names.