1. A method for reconstructing a wideband audio signal, the method comprising: decomposing a lowband audio signal into a plurality of complex subband signals with an analysis filterbank, each of the plurality of complex subband signals representing a frequency channel of the analysis filterbank; generating a highband audio signal by patching a number of consecutive complex subband signals, wherein the generating includes: frequency translating a complex subband signal in a source area channel of the lowband audio signal having an index i to a reconstruction range channel having an index j of the highband audio signal, and frequency translating a complex subband signal in a source area channel of the lowband audio signal having an index i+1 to a reconstruction range channel having an index j+1 of the highband audio signal; adjusting a spectral envelope of the highband audio signal to a desired level; combining the lowband audio signal and the highband audio signal with a synthesis filterbank to generate the wideband audio signal, wherein the lowband audio signal has frequency components below a crossover frequency and the highband audio signal has frequency components above the crossover frequency, and wherein the analysis filterbank and the synthesis filterbank each have L channels, and L is an integer value.