AEC Bandwidth of the AER software (AER 15.1.10), does it provide actual echo cancellation out to 8kHz when using 16kHz sample rate?

Shawn Steenhagen

We have a project which requires a wideband AEC (8KHz bandwidth of AEC, fs=16KHz or above), so we need know if the aer library provides 8kHz bandwidth of AEC. The aer "Fact Sheet" sheet mentions “Sampling rates: 8kHz, 16kHz band-split”. I need to better understanding of what you mean by 16Khz band-split. Does it provide full band AEC out to 8kHz, or is it using a technique in which when there is FarEnd or Double Talk condition, the upper [4K - 8K] band is simply suppressed.

We are looking at using the aer library on the C674x platform.

thanks

-Shawn

over 14 years ago

0 Jianzhong Xu over 14 years ago

TI__Guru 59285 points

Hi Shawn,

The current AER library takes band-split approach for 16kHz sampling rate. During double talk, the upper band of the sub-dominant path (either receive or transmit but not both) will be suppressed.

Our next release will have "true" wideband AEC - upper band will not be suppressed. The release will be available in October 2011.

Regards,

Jianzhong

0 Shawn Steenhagen over 14 years ago in reply to Jianzhong Xu

Expert 1525 points

Thank you for the answer. Do you have any initial MIPS and Memory Estimates for the true wide band AEC on a 674x family DSP? We want to run 3 simultaneous instances of the AER module.

thanks,

Shawn

0 Jianzhong Xu over 14 years ago in reply to Shawn Steenhagen

TI__Guru 59285 points

Shawn,

Sorry for my late replay. For the MIPS and memory required for wide band AEC, a rough estimate is 75% MIPS increase and 75% memory increase over current 16kHz requirements.

Regards,

Jianzhong

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AEC Bandwidth of the AER software (AER 15.1.10), does it provide actual echo cancellation out to 8kHz when using 16kHz sample rate?