1. A method of processing information representing a source signal conveying content intended for human perception, the method comprising: receiving first spectral components that were generated by application of an analysis filterbank to the source signal, wherein the first spectral components represent spectral content of the source signal expressed in a first subspace of a multidimensional space; deriving one or more first intermediate components from at least some of the first spectral components, wherein at least some of the first intermediate components differ from the first spectral components from which they are derived; forming a combination of the one or more first intermediate components according to at least a portion of one or more impulse responses to obtain one or more second intermediate components; deriving one or more second spectral components from the one or more second intermediate components, wherein the second spectral components represent spectral content of the source signal expressed in a second subspace of the multidimensional space that includes a portion of the multidimensional space not included in the first subspace; obtaining estimated measures of magnitude or phase using the first spectral components and the second spectral components; and applying an adaptive process to the first spectral components to generate processed information generating encoded audio information using the first spectral components , wherein the adaptive process generating step is responsive to the estimated measures of magnitude or phase. ; wherein the method is performed by one or more computing devices.