CPC G10H 1/0091 (2013.01) [G10H 1/125 (2013.01); G10L 19/265 (2013.01); G10L 21/038 (2013.01); G10H 2210/311 (2013.01); G10L 21/0388 (2013.01)]  5 Claims 
1. An audio signal processing device comprising one or more processors configured to generate a high frequency component of a signal from a low frequency component of the signal, wherein the one or more processors:
provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals;
determine a set of synthesis subband signals from the set of analysis subband signals;
wherein the nonlinear processing unit is configured to determine an n^{th }synthesis subband signal of the set of synthesis subband signals from a k^{th }analysis subband signal and a (k+l)^{th }analysis subband signal of the set of analysis subband signals; wherein a magnitude of the n^{th }synthesis subband signal is determined from a product of an exponentiated magnitude of the k^{th }analysis subband signal and an exponentiated magnitude of the (k+1)^{th }analysis subband signal; wherein a sum of an exponent of the exponentiated magnitude of the k^{th }analysis subband signal and an exponent of the exponentiated magnitude of the (k+1)^{th }analysis subband signal equals one; and
generate the high frequency component of the signal based on the set of synthesis subband signals.
