Systems and methods of performing gain adjustment

An apparatus for performing gain adjustment, the apparatus comprising:

• an analysis filter configured to determine a first set of spectral frequency values corresponding to a high-band portion of a received audio signal;
• a quantizer configured to generate a second set of spectral frequency values that approximates the first set;
• a spectral distortion calculator configured to estimate a spectral distortion corresponding to a difference between the first set and the second set;
• a gain circuit configured to adjust, based on the spectral distortion, a gain value corresponding to at least a portion of the received audio signal;
• and
• a transmitter configured to transmit an encoded bitstream that includes information corresponding to the adjusted gain value and the second set.

A computer-readable medium storing instructions that, when executed by a computer in an electronic device configured to perform gain adjustment, cause the computer to initiate operations comprising:

• determining a first set of spectral frequency values corresponding to a high-band portion of an audio signal received at the electronic device;
• determining a second set of spectral frequency values that approximates the first set;
• estimating a spectral distortion corresponding to a difference between the first set and the second set;
• adjusting a gain value corresponding to at least a portion of the audio signal based on the spectral distortion;
• and
• transmitting an encoded bitstream that includes information corresponding to the adjusted gain value and the second set.

An apparatus for performing gain adjustment, the apparatus comprising:

• means for determining a first set of spectral frequency values corresponding to a high-band portion of a received audio signal;
• means for generating a second set of spectral frequency values that approximates the first set;
• means for estimating a spectral distortion corresponding to a difference between the first set and the second set;
• means for adjusting a gain value corresponding to at least a portion of the received audio signal based on the spectral distortion;
• and
• means for transmitting an encoded bitstream that includes information corresponding to the adjusted gain value and the second set.