Showing papers by "Silviu Ciochina published in 2005"
14 Jul 2005
TL;DR: An improved spectral subtraction method for reducing acoustic noise added to speech in colored noise environments like helicopter cockpit or car engine is proposed and showed a better quality in terms of Itakura Saito distance and perceptual evaluation of quality for the enhanced speech.
Abstract: We propose an improved spectral subtraction method for reducing acoustic noise added to speech in colored noise environments like helicopter cockpit or car engine. This implementation uses over-subtraction method for spectral subtraction. The noise signal does not affect the speech signal uniformly over the whole spectrum. A nonlinear multi-band Bark scale frequency spacing approach was proposed to reduce colored noise. Simulations showed a better quality in terms of Itakura Saito distance and perceptual evaluation of quality for the enhanced speech.
21 citations
28 Sep 2005
TL;DR: In this article, an improved method for reducing background noise added to speech in noisy environments like helicopter cockpit or car engine was proposed, which uses over-subtraction method for spectral subtraction.
Abstract: In this paper we propose an improved method for reducing background noise added to speech in noisy environments like helicopter cockpit or car engine. This implementation uses over-subtraction method for spectral subtraction. Masking properties of the human ear are exploited to reduce the residual noise after spectral subtraction. A psychoacoustically motivated weighting filter was included to mask the residual musical noise. Simulations showed a better quality with no distortion for the enhanced speech and the musical noise was effectively masked.
9 citations
14 Jul 2005
TL;DR: The paper derives necessary supplementary conditions for ensuring the correct operation of the canceller and verifies them for known adaptive algorithms.
Abstract: This paper deals with a general formulation of the adaptive interference cancellation and also points out the issues arising in the adaptive process for some of the classic adaptive algorithms. Based on a general expression for the cost function of an adaptive filter, we derive the orthogonalization equation and we place it into the adaptive interference cancellation context. The paper derives necessary supplementary conditions for ensuring the correct operation of the canceller and verifies them for known adaptive algorithms.
1 citations
01 Jan 2005
TL;DR: The ATHENA European Research project is proposing a specific structure of hybrid communications access network, exploiting the particularities of the DVB-T system in offering broadband connectivity to Internet for a large category of users, and a specific test-bed was implemented at Politehnica University of Bucharest using the interoperability capabilities of the 802.16d WMAN (WiMax) and DVBs.
Abstract: The ATHENA European Research project (FP6-507312) is proposing a specific structure of hybrid communications access network, exploiting the particularities of the DVB-T system in offering broadband connectivity to Internet for a large category of users. Based on this structure, a specific test-bed was implemented at Politehnica University of Bucharest using the interoperability capabilities of the 802.16d WMAN (WiMax) and DVB-T. This paper deals with the specific aspects of this test bed, describes some tools and applications developed and tested by means of it