Device and method for generating a high-band signal from non-linearly processed sub-ranges

A signal processing method comprising:

• receiving, at a device, a parameter associated with an encoded audio signal;
• generating, at the device, a resampled signal based on a low-band excitation signal;
• selecting, at the device, a plurality of non-linear processing functions based at least in part on a value of the parameter, wherein the plurality of non-linear processing functions comprise a first non-linear processing function and a second non-linear processing function, wherein the first non-linear processing function is different from the second non-linear processing function;
• generating a first excitation signal based on the first non-linear processing function by applying the first non-linear processing function to a resampled signal;
• generating a second excitation signal based on the second non-linear processing function by applying the second non-linear processing function to the resampled signal;
• and
• generating, at the device, a high-band excitation signal based on the first excitation signal and the second excitation signal, wherein the first excitation signal corresponds to a first high-band frequency sub-range that is between approximately 8 kilohertz and 12 kilohertz, and wherein the second excitation signal corresponds to a second high-band frequency sub-range that is between 12 kilohertz and 16 kilohertz.

A computer-readable storage device storing instructions that, when executed by a processor, cause the processor to:

• receive a parameter associated with an encoded audio signal;
• generate a resampled signal based on a low-band excitation signal;
• select a plurality of non-linear processing functions based at least in part on a value of the parameter wherein the plurality of non-linear processing functions comprise a first non-linear processing function and a second non-linear processing function, wherein the first non-linear processing function is different from the second non-linear processing function;
• generate a first excitation signal based on the first non-linear processing function by applying the first non-linear processing function to a resampled signal;
• generate a second excitation signal based on the second non-linear processing function by applying the second non-linear processing function to the resampled signal;
• and
• generate a high-band excitation signal based on the first excitation signal and the second excitation signal wherein the first excitation signal corresponds to a first high-band frequency sub-range that is between approximately 8 kilohertz and 12 kilohertz, and wherein the second excitation signal corresponds to a second high-band frequency sub-range that is between 12 kilohertz and 16 kilohertz.

An apparatus comprising:

• means for generating a resampled signal based on a low-band excitation signal;
• means for selecting a plurality of non-linear processing functions based at least in part on a value of a parameter wherein the plurality of non-linear processing functions comprise a first non-linear processing function and a second non-linear processing function, wherein the first non-linear processing function is different from the second non-linear processing function;
• means for generating a first excitation signal based on the first non-linear processing function by applying the first non-linear processing function to a resampled signal;
• means for generating a second excitation signal based on the second non-linear processing function by applying the second non-linear processing function to the resampled signal;
• and
• means for generating a high-band excitation signal based on the first excitation signal and the second excitation signal, wherein the first excitation signal corresponds to a first high-band frequency sub-range that is between approximately 8 kilohertz and 12 kilohertz, and wherein the second excitation signal corresponds to a second high-band frequency sub-range that is between 12 kilohertz and 16 kilohertz.