Exact(7)
In the nonlinear feature mapping approach, DNN is trained from parallel clean/distorted speech corpus to map reverberant and noisy speech coefficients (such as log magnitude spectrum) to the underlying clean speech coefficients.
Based on the factorization, we can directly reconstruct the reverberant observation as (tilde {mathbf {Y}} = mathbf {R}mathbf {S}mathbf {A}) and the underlying clean speech as (tilde {mathbf {X}} = mathbf {S}mathbf {A}).
As the speech coefficient mapping is a regression task, it is natural to choose the cost function as the mean-squared error (MSE) between the DNN's output and the desired output, i.e., the speech coefficients of the underlying clean speech for current frame.
The BCMI produces the clean speech estimate (hat {mathbf {x}}_{mathrm {u}}) using the conditional distribution p(x u∣x r) with an assumption that the observed noisy speech x u acts as the upper bound for the underlying clean speech.
First, without context information, it is difficult to determine the underlying phone identity of the current frame using only a short frame of 25 ms. One frame is not enough even for accurate phone classification, so it would not be sufficient for predicting the underlying clean vector.
The patterns created by noises of several SNRs can be observed on the log-energy sequences of an underlying clean utterance in the Aurora 2.0 database, as shown at the top of Figure 2. We can see that the degree of oscillation of the speech feature sequence increases with the noise level.
Similar(53)
Hence, at frame t, the log-spectra of the underlying complete clean speech x t can be assumed to be approximately bounded above by the observed noisy feature vector y t, namely: x t ≤ y t (1).
The dorsal surface of the rat was shaved, and the underlying skin was cleaned with povidone iodine.
Yet underlying the breathtaking beauty, clean streets and impressive infrastructure is a fascinating story of a technology adoption gap and cultural resistance.
Mr. Bishop said the court should address the meaning of a provision of the Clean Water Act underlying the regulation.
The media were quick to identify his promotion to assistant manager as the underlying cause behind three successive clean sheets but he barely had time to bask in the praise before normal service resumed.
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