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Higher-order time-varying allpass filters for signal decorrelation in stereophonic acoustic echo cancellation

Higher-order time-varying allpass filters for signal decorrelation in stereophonic acoustic echo cancellation

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A new technique is presented for decorrelating the input signals in stereophonic systems by means of time-varying allpass filters. The controllable and almost linear phase response of higher-order allpass filters is exploited in this context and a particular type of time variation is used to vary the parameters of such filters. Simulation results are presented based on real stereophonic signals and supported by subjective listening tests.

References

    1. 1)
      • M.M. Sondhi , D.R. Morgan , J.L. Hall . Stereophonic acoustic echo cancellation-An overview of the fundamentalproblem. IEEE Sig. Process. Lett. , 8 , 148 - 151
    2. 2)
      • Benesty, J., Morgan, D.R., Sondhi, M.M.: `A better understanding and an improved solution to the problems of stereophonicacoustic echo cancellation', Proc. ICASSP-97, April 1997, p. 303–306.
    3. 3)
      • Ali, M.: `Stereophonic acoustic echo cancellation sytem using time-varying all-passfiltering for signal decorrelation', Proc. ICASSP-98, May 1998, 6, p. 3689–3692.
    4. 4)
      • E. Zwicker , H. Fastl . (1990) Psychoacoustics: Facts and models.
    5. 5)
      • CCITT Recommendation E.432.
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