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Reconstruction of wideband speech from its narrowband version is an attractive issue, since it can enhance the speech quality without modifying the existing communication networks. This paper proposes a new recovery method of wideband speech from narrowband speech. In the proposed method, narrowband spectral envelope of input speech is transformed to… (More)
We investigated theoretically the intensity noise of a wavelength-locked Fabry-Perot laser diode with respect to the injected ASE power, the bias current, and the wavelength detuning.
We derived analytic expressions for the modulation response and the relative intensity noise of a wavelength-locked F-P LD. The analytic results have good agreement with the simulation results.