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The wavelet transform is a modern signal processing tool. The wavelet transform earned itself a great success mainly for its unique properties, such as the capability of recognizing very fast changes in processed signal. The theoretical part of this work is introduction to wavelet theory, more specifically wavelet types, a wavelet transform and its application in systems dealing with signal denoising. A main problem connected to speech signals denoising was introduced. The problem is degradation of the speech signal when denoising unvoiced parts. It is because of the fact that unvoiced parts and noise itself have very similar characteristics. The solution would be to apply different attitude to voiced and unvoiced segments of the speech. The main goal of this diploma thesis was to create an application implementing the speech signal denoising using the wavelet transform. The special attention should have been paid to applying different attitude to voiced and unvoiced segments of the speech. The demanded application is programmed as a grafical user interface (GUI) in MATLAB environment. The algorithm implemented in this form allows users to test introduced procedures with a great comfort. This work presents achieved results and discusses them considering general requirements posed on an application of given type. The most important conlusion of this Diploma Thesis is the fact that some kind of trade-off between sufficient signal denoising and keeping the speech understandable has to be made.

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Le premier secret de famille cité par les personnes interrogées par questionnaire est celui de la filiation. Les personnes nées dans le secret (ou nées sous X) sont destinataires d'un secret imposé par la législation, celui de leurs origines biologiques. Si de surcroît, cette adoption leur a été cachée par leur famille, comme c'est le cas des personnes rencontrées dans le cadre de cette recherche, la conséquence en est une souffrance d'autant plus violente que la révélation aura été tardive. Les loyautés familiales contraignent les membres à répéter événements familiaux et les contraignent à payer les fautes de leurs ancêtres. La famille vit enfermée dans un mythe familial qui prescrit les lois et règles à respecter.Aussi, après la révélation, la personne destinataire du secret va refuser ces lois et règles ; elle va être marginalisée par sa famille et le dialogue, voire toutes relations avec sa famille, seront rompus. Ainsi, elle s'est libérée des lois et règles prescrites par le mythe familial et de toute forme de loyauté vis-à-vis de sa famille. Cette exclusion va lui permettre de se socialiser. En effet, dans notre société, la transparence est le fer de lance et "l'extimité" est prônée. Le secret ne s'y oppose pas mais les complémente et la validation du secret est un soutien à la socialisation pour la personne / The first family secret quoted by the people questioned by questionnaire is that of filiation. The people born in the secret (or born under X*) are recipients of a secret imposed by legislation, that of their biological origins. If in addition, this adoption was hidden from them by their family, as is the case of the people met in the context of this research, the consequence is a all the more violent in terms of suffering as the revelation will have been late. Family loyalty forces members to repeat family events and forces them to pay for the faults of their ancestors. The family lives lockecl up in family myth which prescribes the laws and rules to be respected. And so, after the revelation, the person recipient of the secret will refuse these laws and rules ; he or she will be marginalized by his or her family and dialogue, or even all relations with his or her family, will be broken. Thus, he or she was released from the laws and rules prescribed by family myth and from any form of loyalty with respect to his or her family. This exclusion will enable him or her to become sociable. Indeed, in our society, this transparency is triumphed and "extimity" is applauded. Secrets are not opposed to this but are complimentary and the valid ation of the secret is a support for the socialization of the person