Acoustic Echo Canceller (AEC)

Acoustic Echo Cancellers are used to cancel out the echo produced by the acoustic path between the speaker and microphone in hands-free telephone and video/audio conferencing solutions (mobile phones, Speaker Phones, IP Phones). Acoustic echo is caused due to the reflections from the walls and objects present in the environment (for example, echo from inside of a car for hands free telephone or room walls for conferencing solutions). Ittiam's Acoustic Echo Canceller (AEC) is a proprietary algorithm to remove the acoustic echo from speech.

Technical Specification

• Efficient adaptive algorithm removes the echo and enhances the speech quality
• Robust double talk detection (can detect double talk even in presence of 20 dB gain in the echo path)
• Fast convergence ( > 20 db / sec)
• Programmable filter length (delay)
• ITU-T G.167 compliant
• Comfort Noise Generator (CNG)
• Non-Linear Processor (NLP) for reducing non-linear residual echo
• Reentrant, multi-channel implementation
• C callable APIs

Applications

• IP Phones / Speaker Phones / Video Phones / Feature Phones
• Multimedia / Telecommunication products
• Audio Conferencing / Video Conferencing
• Handsfree systems

Platforms

• Currently supported on TI C64x™ (TMS320C64xx™) and TI C64x+™/DaVinci™ (DM644x™)
• For further details contact mkt@ittiam.com