Patent ID: 9646633
Date: 2017-05-09
CPC Classifications: G10L

Claim:
1. A method of improving the tone of an audio signal, which is performed at an electronic device having one or more processors and memory, the method comprising: obtaining a set of data, the set of data comprising Linear Spectrum Pairs (LSP) parameters for the audio signal; determining a set of sampling data points from the set of data comprising the LSP parameters using a predetermined sampling rule, the set of sampling data points including respective spectrum amplitude values for a plurality of sampled frequency values; identifying one or more local maxima among the set of sampling data points, and a respective preceding local minimum and a respective succeeding local minimum for each of the identified local maxima; for each of the identified local maxima, shifting one or more of the set of data comprising the LSP parameters located between the respective preceding local minimum and the respective succeeding local minimum of the identified local maximum towards the identified local maximum, wherein shifting the one or more of the set of data further comprises shifting solely data located within a predetermined frequency range around the identified local maximum towards the identified local maximum, and the predetermined frequency range is smaller than any of a frequency range between the identified local maximum and the respective preceding local minimum, and a frequency range between the identified local maximum and the respective succeeding local minimum; and adjusting the set of data comprising the LSP parameters using an energy coefficient after the shifting for all of the identified local maxima is completed.