Systems and Methods of Performing Filtering for Gain Determination

A method comprising:

• comparing an inter-line spectral pair (LSP) spacing associated with a frame of an audio signal to at least one threshold;
• and
• filtering a high-band portion of the audio signal to generate a filtered high-band output based at least partially on the comparing;
• and
• determining gain information based on a ratio of a first energy corresponding to the filtered high-band output to a second energy corresponding to a low-band portion of the audio signal.

An apparatus comprising:

• a noise detection circuit configured to determine, based on spectral information corresponding to an audio signal that includes a low-band portion and a high-band portion, that the audio signal includes a component corresponding to an artifact-generating condition;
• a filtering circuit responsive to the noise detection circuit and configured to filter the high-band portion of the audio signal to generate a filtered high-band output;
• and
• a gain determination circuit configured to determine gain information based on a ratio of a first energy corresponding to the filtered high-band output to a second energy corresponding to the low-band portion to reduce an audible effect of the artifact-generating condition.

An apparatus comprising:

• means for determining, based on spectral information corresponding to an audio signal that includes a low-band portion and a high-band portion, that the audio signal includes a component corresponding to an artifact-generating condition;
• means for filtering a high-band portion of the audio signal to generate a filtered high-band output;
• and
• means for generating an encoded signal, wherein the means for generating the encoded signal includes means for determining gain information based on a ratio of a first energy corresponding to the filtered high-band output to a second energy corresponding to the low-band portion to reduce an audible effect of the artifact-generating condition.

A non-transitory computer-readable medium comprising instructions that, when executed by a computer, cause the computer to:

• determine, based on spectral information corresponding to an audio signal that includes a low-band portion and a high-band portion, that the audio signal includes a component corresponding to an artifact-generating condition;
• filter the high-band portion of the audio signal to generate a filtered high-band output;
• and
• generate an encoded signal, wherein generating the encoded signal includes determining gain information based on a ratio of a first energy corresponding to the filtered high-band output to a second energy corresponding to the low-band portion to reduce an audible effect of the artifact-generating condition.