What is Full Duplex?


When using a conferencing device, it's important to understand how it receives audio and transmits it to various locations. There are three main kinds of communication channels in the telecom world: half duplex, full duplex, and simplex. Each communication mode transfers audio information in a specific way. In this handy guide, we've explained full duplex mode in detail, so you can find out if full duplex is a good communication type for your conference room needs.

What is Full Duplex?

Essentially, a full duplex speakerphone setup allows multiple users to communicate simultaneously. If you're hosting a conference with multiple parties, it allows anyone to interrupt and chime in without cutting off the current speaker. It's possible for speech to overlap in full duplex mode, unlike a half duplex system, which can only support one audio signal at a time. To deal with clashing speech and potential audio feedback issues, a full duplex speakerphone also has built-in DSP (digital signal processing) that neutralizes echoes in the room.

How Does Full Duplex Work?

To support overlapping speech, a full duplex system is designed with two links that can transmit audio data in both directions simultaneously. Just like a telephone signal, there are two communication paths. One path receives audio data, while the other path transmits your speech to the rest of the conference.

For example, the FLX UC 500 conference phone has a full duplex design that allows for seamless real-time communication. You can connect the phone to your computer via USB and use it with virtually any video conferencing software, no matter how many parties have joined the conference. The four embedded microphones provide 360° audio coverage with individual echo cancellation for each mic, so you get the best possible sound in your space.

Full Duplex Technology

So, how does DSP technology work to cancel echoes that build up with a full duplex device? When one or multiple parties are talking, their audio is being played over speakers in the conference room. This amplified playback can get picked up again by the microphones, which may cause annoying echoes or feedback. To handle it, a full duplex device will use a built-in echo cancellation algorithm for each microphone, so that the main signal is isolated from any background noise. This ensures that you get a clean audio signal in both directions, even though multiple parties may be talking over each other.

Click here to learn all about our full duplex products, like the FLX UC 1500 USB & VoIP Conference Phone. Equipped with cutting-edge speakers, microphones, and DSP echo cancellation, they offer simultaneous communication with pristine audio quality.

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