OK.
No , I w  I begin to play  with Matlab and to found some parameter robust for voiced - unvoiced decision. But only to play. And we   they  we found that maybe w is a classical parameter , the  sq the variance  between the um FFT of the signal and the small spectrum of time  we  after the um mel filter bank.
Uh - huh.
And , well , is more or less robust. Is good for clean speech. Is quite good  for noisy speech.