RADLIVE is an advanced technology company focused on bringing clarity, intelligibility and realism to VoIP based audio conferencing. Using cutting edge technological innovation RADLIVE provides the ultimate conferencing experience by offering best audio quality and unique audio presence capabilities.

Audio Presence: spatial separation for each location

Proprietary Codec

RADLIVE has developed a proprietary, high definition codec that provides superior performance when contending with challenging network conditions. This patent pending codec uses a parametric method that enables interpolation and extrapolation of missing audio packets at the compressed domain, achieving a cost effective and accurate reconstruction of delayed or lost audio packets. This unique technology is combined with an adaptive jitter buffer, assuring smooth audio quality and minimal conversation latency, even with high network congestion and extreme packet loss. RADLIVE Codec is wideband and ideally suited for the coding of audio and speech.

Acoustic Echo Canceller and Reverberation Reduction

Audio relayed from local loudspeakers can be picked up by the microphones to create an undesired echo effect. RADLIVE provides acoustic echo cancellation to efficiently remove any echo, assuring clear, high quality audio at all times. Using a multi-channel acoustic echo canceller the echo can be effectively removed from simultaneously active loudspeakers. This can be achieved by implementing multiple adaptive filters per microphone and by the sophisticated removal of any remaining residual echo.

In room reverberation may color the voice of speakers, resulting in an unpleasant and ‘hollow’ feel. RADLIVE offers an innovative acoustic design that assures significant reduction of the reverberation affect so the voice stream sounds clear and natural at all times.

Noise Suppression

In any one room there are various noise sources such as a projector fans, air-conditioning, laptop fans etc. The noise is modified by the room transfer characteristics before being picked up by the microphone. Consequently, spectral characteristics of the noise vary significantly with time. RADLIVE provides a noise suppression component that implements a dynamic model to track noise as it changes. Frequency domain methods are then used to remove noise from the microphone signal without impacting the recorded voice.

Abrupt noise sources such as keyboard typing or the moving of furniture presents a different and more complex challenge, as these noise types are harder to model. RADLIVE’s innovative noise suppression unit implements advanced modeling to identify abrupt noise and effectively distinguish between noise and transients. The abrupt noise is then attenuated leaving the voice clear of artifacts.

Primary Microphone Allocator

When Audio Units are positioned well, each conference participant should have a microphone within nearby proximity. The Primary Microphone Allocator is responsible for automatically selecting the best positioned microphone to effectively relay the participant’s voice. However, we are aware of multiple in room noise sources and also realize that conference participants occasionally speak simultaneously during a call. By enabling each microphone to measure all incoming signals the optimal microphone is dynamically chosen for each conference user to assure best audio quality at all times. The Primary Microphone Allocator can also use a mix of several microphone inputs when multiple people speak simultaneously in the same room.

Audio Leveling

Audio leveling was designed to support a natural level of conversation throughout the duration of an audio conference call. This feature is relevant when conference participant’s talk to the microphone from various distances, when people talk louder than others and when remote participants join the conference at different volume levels. RADLIVE support this requirement by leveling all audio inputs and relaying them back to the listeners without any noticeable level variations. This technology assures consistently high audio quality levels.