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Different short-term spectrum estimators for speaker verification under additive noise are considered. Conventionally, mel-frequency cepstral coefficients (MFCCs) are computed from discrete Fourier transform (DFT) spectra of windowed speech frames. Recently, linear prediction (LP) and its temporally weighted variants have been substituted as the spectrum analysis method in speech and speaker recognition...
Quality and intelligibility of narrowband telephone speech can be improved by artificial bandwidth extension (ABE), which extends the speech bandwidth using only information available in the narrowband speech signal. This paper reports a three-language evaluation of an ABE method that has recently been launched in several of Nokia's mobile telephone models. The method extends the speech bandwidth...
Digital communications place ever-increasing demands on the linearity of power amplifiers. To meet these challenges, the system engineer needs to either increase the maximum output power of the amplifier, if the DC power or thermal limitations allow this, or improve the linearity of the amplifier. We have developed very broadband predistortion linearisers for traveling wave tube amplifiers (TWTA)...
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