Patent ID: 8731215

Claim:
A method for scaling perceived loudness of an audio signal, comprising: changing a first gain to scale a first perceived loudness of a first channel by a scale factor to a first new perceived loudness of the first channel, each of the first perceived loudness and the first new perceived loudness being a respective value of a nonlinear function of a power of the first channel; changing a second gain to scale a second perceived loudness of a second channel by the scale factor to a second new perceived loudness of the second channel, each of the second perceived loudness and the second new perceived loudness of the second channel being a respective value of a nonlinear function of a power of the second channel; wherein the first and second gains differ and are specifically selected so that a first ratio between the first new perceived loudness and the first perceived loudness equals a second ratio between the second new perceived loudness and the second perceived loudness; where the method is performed by one or more computing devices.