Methods, systems, computer readable media, and program code (51) to provide for filtering noise and/or restoring attenuated spectral components in acoustic signals (410), are provided. An exemplary embodiment of a method includes dynamically filtering each of a plurality of raw fft data samples (420) of a record to remove or attenuate background noise contained therein to thereby produce a corresponding plurality of cleaned fft data samples (430). The sample-specific background noise is removed or attenuated by a record-specific dynamic filter (640) to produce the corresponding cleaned fft data samples (430). The method can also include restoring the attenuated high-frequency components of the cleaned data samples through application of a record-specific restoring processor (930) at least partially defined by a portion of the cleaned data samples and a Gain Function to thereby produce cleaned and restored data samples, and applying an inverse transformation to convert the cleaned and restored data samples into cleaned and restored data samples in time domain data (732). An exemplary system (30), computer readable media, and program code is configured to perform the exemplary method.