MINUET Musical Interference Unmixing Estimation Technique

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MINUETMusical Interference Unmixing Estimation
Technique

• Scott Rickard, Conor Fearon
• Department of Electronic Electrical Engineering
• University College Dublin, Ireland
• Radu Balan, Justinian Rosca
• Siemens Corporate Research,
• Princeton, NJ.

CISS04
18th March 2004
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MINUET The Problem

• Given x and n
• Find s

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Classical Solution(Adaptive Filtering)
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Adaptive Algorithms

• Least-Mean Square (LMS) Algorithm
• - minimises mean-square error
• Recursive Least Squares (RLS) Algorithm
• - minimises sum of squares of error

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Problem!

• Performance drastically deteriorates with small
  phase and synchronisation errors.

• Mixture
• No error
• Delayed by 1 sample
• Delayed by 10 samples

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W-Disjoint Orthogonality

• At every point in the t-f representation of a
  mixture, only one source is active.

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MINUET Solution

• Consider simple problem
• Create Mask
• Solution

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Synchronisation Errors?

• The performance of time-frequency masking with
  respect to small phase and synchronisation errors
  is extremely robust.

• Mixture
• No error
• Delayed by 1 sample
• Delayed by 10 samples

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SNR improvement
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Performance Measures

• SNR is a standard performance measure
• But what about speech quality?
• Incorrect partitioning of t-f domain reduces
  intelligibility of output.
• Introduce measure of WDO

O. Yilmaz and S. Rickard, "Blind Separation of
Speech Mixtures via Time-Frequency Masking", IEEE
Transactions on Signal Processing, To appear,
July 2004.
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WDO
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MINUET Channel Estimate

• Find set of t-f points, S, such that
• for

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Adaptive Testing
Unity Channel
Random Channel
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Conclusions and Future Work

• MINUET estimates the channel and removes
  interference using instantaneous t-f magnitudes
  only.
• This creates extraordinary robustness to phase
  errors when compared to classical adaptive
  filtering methods.
• Improvements in t-f masking still necessary to
  increase intelligibility.
• Algorithm complexity has not yet been considered.
• We presented pilot tests serving as proof of
  concept only.
• More realistic testing must be done to genuinely
  assess performance.
• MINUET will be effective for any signals which
  are WDO.

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Thank you for your attention!