changxuding / subband_kalman_aec

Subband kalman filter for echo cancellation

Subband_Kalman_AEC

Subband kalman filter(inlcude robust version like sr-kalman, if, sr-if) for echo cancellation; Residual echo suppression part same as speex.

Linear echo cancellation

• Kalman filter
• Square root kalman filter
• Information filter
• Square root information filter

Something to be Concerned

• bad performance of high frequency in some cases

Test Audio

• record from respeaker 6 mic
• Aec_samples
• AEC-Challenge

Reference

• athena-signal
• distant_speech_recognition
• speexdsp
• Multirate digital signal processing, Crochiere, R. E. , & Rabiner, L. R.
• Study of the General Kalman Filter for Echo Cancellation, Paleologu C , Benesty J , Ciochina S
• On Adjusting the Learning Rate in Frequency Domain Echo Cancellation With Double-Talk, Valin J M
• Adaptive Filter Theory. Haykin S
• Factorization Methods for Discrete Sequential Estimation, Gerald J. Bierman
• Kalman Filtering: Theory and Practice, Mohinder S. Grewal and Angus P. Andrews

subband_kalman_aec's Issues

about filter_dc_notch16

hello,actor:
firstly, thanks to ur code。
and i want to ask u a question about the function "filter_dc_notch16", i dont know what is used for.loonking forward to ur replay