Patent ID: 8332228
Filing Date: 2012-12-11
Classification: G10L

Abstract:
1. A method of generating a highband excitation signal, said method comprising using an electronic device to perform the following acts: generating a spectrally extended signal by extending at least a magnitude spectrum of a first signal that is based on an encoded narrowband excitation signal; and performing anti-sparseness filtering of a second signal that is based on the encoded narrowband excitation signal, wherein either (A) the second signal is based on the spectrally extended signal or (B) the first signal is based on a result of said performing anti-sparseness filtering, and wherein the highband excitation signal is based on the spectrally extended signal, and wherein the highband excitation signal is based on a result of said performing anti-sparseness filtering, and wherein said performing anti-sparseness filtering of the second signal comprises deciding, based on the value of a spectral tilt of a narrowband speech signal from which the encoded narrowband excitation signal is derived, whether to filter the second signal.