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High Definition Audio Conferencing

Applications  / High Definition Audio Conferencing
Introduction
Block Diagram
Definitions
Benefits

 

Introduction
 

The calendar reminder indicates that the conference call starts in 0 minutes.  Will both parties hear each other clearly?  Alango’s digital signal processing technologies for high quality audio teleconferencing systems address a number of challenges to achieve a clear calling experience. 

Alango’s Extended Voice Communication Package (EVCP) is designed for optimal performance in large reverberant conference rooms utilizing multiple microphones to accommodate several participants.  Alango EVCP addresses acoustic and lines echoes, background noises, wide range of participants’ voice levels and loudspeaker distortions, ensuring a pleasurable audio experience for the participants on both ends of the call when 0 minute arrives.

 
Block Diagram

 

 

 

Definitions
 
Acoustic Echo Canceller (AEC) Eliminates mono and stereo acoustic echo with high frequency resolution, sub-band adaptive filters and residual echo suppressor that adjust quickly while efficiently utilizing available computational resources and memory to ensuring full-duplex communication. Adept at cancelling very long echo tails (up to 1000ms) that are prevalent in large reverberant conference rooms.
Noise Suppressor (NS) Detects and attenuates noises (air conditioner, projector fan, etc.) in transmitted and received signals.
Automatic Gain Control (AGC) and Dynamic Range Compressor (DRC) Automatically detects and chooses the microphones with the strongest signal-to-noise ratio, which ensures optimal signal mixing from several microphones/participants.
Intelligent Speech Mixer (ISM) Automatically detects and chooses the microphones with the strongest signal-to-noise ratio, which ensures optimal signal mixing from several microphones/participants.
Line Echo Cancellation (LEC) Eliminates electrical echo caused by electoral impedance mismatch between the device and the analog telephone line. Electrical echo does not exist in digital networks.

 

Benefits
 

Very long acoustic echo tails, highly efficient automatic gain control, flexible implementation, ideal for various conference systems and rooms. 

Optimal usage of available resources. 

Adaptable to a multitude of different designs.

Ported to all major DSP and MCU cores.

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