Apple
Top Questions
- Audio Delay / Lag - Visual Not Synced with Audio, Echo with TV Speaker
Audio latency is, essentially, the time it takes for audio data to move from your audio source to your headphones. Wired headphones produce an imperceptible amount of lag—about 5-10ms worth. Within this 5-10ms window, your phone or computer processes the digital audio data, converts said data to an analog audio signal, and then streams the signal through your headphones or speakers.
Bluetooth devices spend a lot more time to do this “processing”. The source device compresses the data and wirelessly transmits it. Then the headphones or speakers receive the data and decompresses it.
The wireless communication program is called a “Codec”. It acts like a specific language that the sender and the receiver agree to communicate with. Different codecs lead to different audio delay times.
Bluetooth Audio Codec
Audio delay
aptX™ HD
≥ 250ms
aptX™ Low Latency
~ 40ms
aptX™
~ 70ms
FastStream
~ 40ms
SBC (Sub Band Codec)
~ 220ms
To benefit from the lowest amount of audio delay, BOTH the sender and the receiver must support either the aptX Low Latency or the Fast Stream Codec. If only one side supports aptX Low Latency but the other side does not, the streaming will use the next available codec supported by both devices, such as SBC or aptX. You will find that your Bluetooth audio and TV speaker audio are not in sync.
How do you confirm whether your Bluetooth headphones support the aptX Low Latency or FastStream codec? Simply check its specifications in its product listing or manual. Apple Headphones and nearly all true wireless earbuds do not support aptX Low Latency. Some headphones claim that they do, unless they are a reputable brand, you still need to double check from Certified aptX Low Latency device list from www.aptx.com.
There is another factor that you need to keep in mind regarding audio delay, which is Codec priority. Many Bluetooth devices have a Codec "priority" list, meaning that it prioritizes using some Codecs over others when connecting to other devices. For example, the DG80 Dongle's Codec priority goes like this: 1.FastStream, 2.aptX low latency, 3.aptX, 4.SBC. When connecting with other devices, the dongle will go through these codecs one by one until it finds one that is supported by the device it's connecting to.
Where this gets tricky is if you are connecting multiple devices to each other. Bluetooth devices will use the lowest common denominator supported by all devices, not necessarily the fastest codec. This can result to a slower codec being used, even though your headphones support a faster codec. Read more here.
If you suspect that this is an issue, a fix is to factory reset / clear the pairing history of the devices experiencing audio delay. This may fix the issue.
What if my headphone is not low latency supported? You have the following options:
1. Change to a Low Latency supported headphone;
2. Get a headphone / transmitter Set. We have plenty of options HERE.
3. Live with the slight lip sync delay.
Was this article helpfulStill need help? Please email us at support@avantree.com
Back to Top - How to Connect AirPods (Pro) to TV using an Avantree Transmitter
In short, YES you can definitely use your Airpods with our transmitter
Connecting your AirPods to the Transmitter:
Step 1: Turn OFF the Bluetooth on every device that's previously connected to your AirPods.
Step 2: Put your AirPods back into its case.
Step 3: Get the AirPods into Pairing Mode.
Close the lid and flip it open again. Press & Hold the button on the back of the charging case until the little LED light starts flashing WHITE.
Step 4: Put your Avantree Bluetooth transmitter into Pairing Mode as well.
Please refer to its user guide if you're not sure how. With both devices in pairing mode, keep them close to each other and give them a few seconds. Please check their respective LED indicators to make sure that they've connected.
Volume Control:
If you're using Optical Connection: You won't be able to adjust volume via your TV remote controls. We recommend using Oasis Plus or Audikast Plus; the volume control buttons on them will allow you to control the volume at will.
If you're using AUX (3.5mm) or RCA (Red/White) Connection: You may adjust volume via your TV's remote control.
If you're using USB Connection: We recommend DG40s/DG50/Audikast/Priva III. You can adjust the volume on PC.
In case you prefer Learning through Videos:
Please contact us at support@avantree.com if you have questions.Was this article helpfulStill need help? Please email us at support@avantree.com
Back to Top - Apple TV No Sound when Used with Avantree Transmitter/Headphone
Here is step by step Video guide FYI - No Sound when watching Apple TV - How to FIX?
Step 1: Click the MENU button on your Apple TV remote
Step 2: Scroll down and select "Settings"
Step 3: Scroll down and Select "Video and Audio"
Step 4: Scroll down and Go into "Audio Format"
Step 5: Click on "Change Format"
Step 6: Choose "Change Format" again
Step 7: Click on "New Format"
Step 8: Change it to "Stereo"
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