Our implementation of a G.167 Acoustic Echo Canceller is designed to cancel acoustic feedback between a loudspeaker and a microphone in loudspeaking audio systems. The tail length of the echo suppression can be adjusted to system requirements. The algorithm is required in speaker phones, teleconferencing devices, voice-control systems or alike.

Features

• Software controlled Coefficient Adaptation
• Software controlled Leakage
• Software controlled Non-linear Processor (NLP)
• Software controlled Howling Control
• Double Talk Detector with Adaptation Control
• Programmable Tail Length

Specification

• ~10 MIPS per channel (32 msec tail
• < 2K words program memory
• max. 250 msec tail @ ~50 MIPS
• 80 + 32*T bytes data memory (T = tail in msec)
• Single Talk Attenuation > 45db
• Double Talk Attenuation > 30db
• Convergence ~ 20dB/sec
• ITU G.167 compliant

The algorithm is currently available for Analog Devices Blackfin and Texas Instruments TMS320C54x/C55x, implementations for other platforms on request. All implementations allow multi-channel applications due to the re-entrant and flexible structure of the algorithm.

Demo versions are available on request for evaluation platforms such as EZKit or DSK

Datasheets

G.167 AEC for Analog Devices Blackfin
G.167 AEC for Texas Instruments C5000
G.167 AEC for Texas Instruments C6000

If you wish to receive further information please, contact us.