Systems and methods for reconstructing an audio signal from transformed audio information
A system and method may be configured to reconstruct an audio signal from transformed audio information. The audio signal may be resynthesized based on individual harmonics and corresponding pitches determined from the transformed audio information. Noise may be subtracted from the transformed audio information by interpolating across peak points and across trough points of harmonic pitch paths through the transformed audio information, and subtracting values associated with the trough point interpolations from values associated with the peak point interpolations. Noise between harmonics of the sound may be suppressed in the transformed audio information by centering functions at individual harmonics in the transformed audio information, the functions serving to suppress noise between the harmonics.
1. A method for reconstructing an audio signal from transformed audio information, the method comprising:
obtaining transformed audio information representing a sound, wherein the transformed audio information specifies magnitude of a coefficient related to signal intensity as a function of frequency for the audio signal and time;
suppressing noise between harmonics of the sound in the transformed audio information by centering functions at individual harmonics in the transformed audio information, the functions serving to suppress noise between the harmonics to yield noise-reduced transformed audio information, wherein the width of a given function is based on a bandwidth of a corresponding harmonic; and
reconstructing the audio signal based on a reverse transformation of the noise-reduced transformed audio information.
2. The method of claim 1 , wherein individual ones of the functions include a Gaussian function, the Gaussian function being configured to suppress information between the harmonics and replace information associated with the harmonics with a Gaussian curve.
3. The method of claim 2 , wherein a given Gaussian curve is fitted to a corresponding harmonic.
4. The method of claim 1 , wherein individual ones of the functions include a rectangular function, the rectangular function being configured to zero information between the harmonics while preserving information associated with the harmonics.
5. The method of claim 1 , wherein the functions are separately applied to real and imaginary components of the transformed audio information.