Introduction —
Benefits of Wider Bandwidth —
Technical Challenges —
Brief Survey Of Solutions —
Proposed Solution —
Non-linear Frequency Compression —
Reconstructing the Bins —
Conclusion
[+]
Introduction
High quality, full-duplex Acoustic Echo Cancellation (AEC) is an integral component of a hands-free speakerphone communication system, because it allows participants to ...
Benefits of Wider Bandwidth
The benefits of using wider bandwidth for speech communication are described well by Pennock and Hetherington, and in the works they cite. The key improvements ...
Technical Challenges
Our existing Aviage Acoustic Processing software library (released in summer 2009) already processes wideband speech operating at a 16,000 Hz sample rate. Our challenge ...
Brief Survey Of Solutions
Beaugeant et al. describe a "dual-mode" solution that splits a wideband signal into low band (0-4,000 Hz) and high band (4,000-8,000 Hz) regions. This solution ...
Proposed Solution
Our solution combines the non-linear aspects of the human auditory system with the strengths of a traditional subband adaptive filter. We reduce ...
Non-linear Frequency Compression
The human auditory system maps a linear frequency scale onto a non-linear perceptual scale. Similarly, we reduce the number of FFT bins ...
Reconstructing the Bins
The challenge is, of course, to expand or reconstruct the smaller subset of M perceptually important subbands back to the full set of R bins required for the frequency-to-time ...
Conclusion
We have developed novel methods for reducing the computational complexity and memory requirements for Acoustic Echo Cancellation. Our solution has been validated and will be deployed (summer 2010) in ...
