aflyingwolf / Subband_Kalman_AEC

Subband kalman filter for echo cancellation, include residual echo supression as speex.

Subband_Kalman_AEC

Subband kalman filter for echo cancellation, include residual echo suppression as speex.

Main Parameters for Tuning

linear kalman filter
- tap
residual echo suppression
- suppress_gain
others
- smooth factor
- min/max value
- nosie variance update method

To be Optimized

• dual filter for better control
• dtd for different residual echo supression between st and dt
• matrix calculation efficiency of m file

Problem 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