1. A method, comprising: determining first spectral features of one or more first frames in a series of frames that represent an audio signal; obtaining one or more autocorrelation coefficients of a modulation envelope of the audio signal based on at least the first spectral features of the one or more first frames; modifying parameters of an adaptive modulation filter used to filter spectral features of the audio signal based on the one or more autocorrelation coefficients; determining second spectral features of one or more second frames in the series of frames; updating the one or more autocorrelation coefficients based on at least the second spectral features of the one or more second frames; and modifying the parameters of the adaptive modulation filter based on the one or more updated autocorrelation coefficients.