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G.167 Acoustic Echo Canceller
G.167 compliant acoustic echo controller (AEC) is capable of providing perceptually full duplex quality in average-sized office rooms when used in inexpensive speakerphones with a single omni-directional microphone.
AEC incorporates results of recent technological advances in transform domain multi-rate adaptive processing, psychoacoustics, adaptive post-filtering, noise reduction, sensitive and robust echo path change and double talk detectors into an integrated DSP algorithm.
AEC accounts for loudspeaker non-linearity and is capable of performing in full dynamic range even with inexpensive loudspeakers, suffering from significant distortions.
AEC is primarily designed for VoIP/VoLAN/PBX phones, which already employ a DSP to perform signal-processing functions.
AEC is built around a single DSP platform (TI's 'C5000 family DSPs).
AEC can be configured not to occupy all MIPS in the DSP and leave enough resources to perform phone control functions and other activities.
AEC can be extended to operate with more than one microphone and perform active beam forming in real time along with acoustic echo control operations if 'C55x platform is used, what significantly increases speakerphone's quality by room "de-reverberation" and partial exclusion of the room resonance modes.
AEC Demo can be arranged for on customer's TI's TMS320VC5510 DSK.
The archive with ANSI C, 'C54xx, 'C55xx Source code is available from download page.
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