Patent ID: 9711156
Date: 2017-07-18
CPC Classifications: G10L

Claim:
1. A method comprising: determining a minimum inter-line spectral pair (LSP) spacing of high-band LSPs in a frame of an audio signal that includes a low-band portion and a high-band portion; based on the minimum inter-LSP spacing, determining whether the audio signal includes a component corresponding to an artifact-generating condition, wherein the minimum inter-LSP spacing corresponds to a difference between a first value corresponding to a first LSP coefficient of the frame and a second value corresponding to a second LSP coefficient of the frame; conditioned on the audio signal including the component, filtering the high-band portion of the audio signal to generate a filtered high-band output; determining gain information based on a ratio of a first energy corresponding to the filtered high-band output to a second energy corresponding to at least one of a synthesized high-band signal or the low-band portion of the audio signal; and outputting high-band side information based on at least one of the high-band portion of the audio signal, a low-band excitation signal associated with the low-band portion of the audio signal, or the filtered high-band output, the high-band side information indicating frame gain information, the high-band LSPs, and temporal gain information corresponding to sub-frame gain estimates based on the filtered high-band output.