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Re: DM: Speech Enhancement -- Using Neural Nets?
From: Mark Last
Date: Wed, 20 Oct 1999 21:20:47 -0400 (EDT)
Hi Anjani, Check the following paper: A.L. Gorin, S.E. Levinson, A.N. Gertner and E. Goldman, Adaptive Acquisition of Language, Computer Speech and Language, vol. 5, no. 2, pp. 101-132, Apr. 1991. They are using a neural-like structure, called "information-theoretic connectionist network", which is based on Shannon's information theory. Mark At 08:41 PM 10/19/99 MDT, anjani avasarala wrote: >Hello, > > can anyone help me in tacking the below problem?. > I am working on speech enhancement. > We are trying to address the issue of speech enhancement > when the speech is degraded by two ways: > 1. Additive noise > 2. This case needs a brief introduction: > The situation is like this. The speech signal is > encoded using a standard coding technique (say > Continuously variable slope delta modulation (CVSD)). > So all we have is now a binary bit pattern. If this > is all, there is no problem. We can apply corresponding > decoding technique to get back the signal. But now some > bits in this coded speech are flipped (the choice of bits > is at random). So, the sequence information is lost. > In such cases we would like to do the following studies: > (a) Is there any way to reconstruct the speech signal from > this new binary pattern ( i.e., flipped coded speech)? > (b) What features of the original speech signal does this > new signal retain? > > This problem can be looked in two different ways: > 1. Applying bit error correction codes. But this > methods doesn't take into account the speech concepts. > 2. Another method is exploiting the redundancy in the > speech signal. As we know speech is highly redundant > in nature. So, it is not necessary to know each and > every word to infer the message. So, does coded speech > still contain this redundancy?. If so, what happens when > bits are flipped at random?. > Can neural networks be useful in this context?. > Currently, I am working on neural network methods only. > > Hope I am clear. Write to me for further details. > Hope someone will respond to this. > Thankyou, >Anjani > >____________________________________________________________________ >Get free email and a permanent address at >http://www.netaddress.com/?N=1 > > --------------------------------------------- Mark Last Visiting Assistant Professor Computer Science and Engineering University of South Florida 4202 E. Fowler Ave., ENB 118 Tampa, FL 33620, USA Tel: 813/974-4763 Fax: 813/974-5456 firstname.lastname@example.org WWW: http://www.csee.usf.edu/~mlast/