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Potential Field, Geoelectrical and Reflection Seismic Investigations for Massive Sulphide Exploration in the Skellefte Mining District, Northern Sweden

Tavakoli S., Dehghannejad M., García Juanatey M. d. A., Bauer T. E., Weihed P., Elming S.-A.

Acta Geophysica

2016

Vol. 64, no. 6

2171--2199

Multi-scale geophysical studies were conducted in the central Skellefte district (CSD) in order to delineate the geometry of the upper crust (down to maximum ~ 4.5 km depth) for prospecting volcanic massive sulphide (VMS) mineralization. These geophysical investigations include potential field, resistivity/induced polarization (IP), reflection seismic and magnetotelluric (MT) data which were collected between 2009 and 2010. The interpretations were divided in two scales: (i) shallow (~ 1.5 km) and (ii) deep (~ 4.5 km). Physical properties of the rocks, including density, magnetic susceptibility, resistivity and chargeability, were also used to improve interpretations. The study result delineates the geometry of the upper crust in the CSD and new models were suggested based on new and joint geophysical interpretation which can benefit VMS prospecting in the area. The result also indicates that a strongly conductive zone detected by resistivity/IP data may have been missed using other geophysical data.

A Data Field method for speech enhancement incorporating Binary Time-Frequency Masking

Huang J., Zhang Y., Zhang X., Zhu T.

Przegląd Elektrotechniczny

2011

R. 87, nr 7

225-229

A data field approach coupled with binary time-frequency masking is presented for the speech enhancement problem. In this proposed approach, data field method is employed to model the time and frequency dependencies of speech. This formulation has proved to be very helpful in enhancing speech quality by exploiting the correlation of speech both in time and in frequency. The experimental results demonstrate that the proposed algorithm offers improved signal to noise ratio and less spectral distortion.

Do poprawy jakości dźwięku mowy zastosowano metodę pola danych (Data field) połączoną z binarnym maskowanie czasowoczęstotliwościowym. Pozwoliło to znacząco poprawić jakość dźwięku przez wykorzystanie korelacji czasowej i częstotliwościowej. Uzyskano poprawę stosunku sygnału do szumu i zmniejszenie poziomu zniekształceń.