Signal Processing with Lapped Transforms
Signal Processing with Lapped Transforms
Digital Coding of Waveforms: Principles and Applications to Speech and Video
Digital Coding of Waveforms: Principles and Applications to Speech and Video
Psychoacoustics: Facts and Models
Psychoacoustics: Facts and Models
Transform coding of audio signals using perceptual noise criteria
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
Removing the blocking artifacts of block-based DCT compressed images
IEEE Transactions on Image Processing
Adaptive postfiltering of transform coefficients for the reduction of blocking artifacts
IEEE Transactions on Circuits and Systems for Video Technology
Blocking artifact detection and reduction in compressed data
IEEE Transactions on Circuits and Systems for Video Technology
IEEE Transactions on Circuits and Systems for Video Technology
Efficient reduction of block artifacts in reduced resolution update video coding
IEEE Transactions on Circuits and Systems for Video Technology
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We revisit the problem of blocking artifacts and their suppression in generic frame-based speech/audio applications. We provide a perceptual characterization of the artifacts by using dynamic auditory models. We propose some short-time-Fourier-transform-based magnitude and phase smoothing techniques and show that localized time-frequency smoothing suppresses the artifacts to a large extent. Our experiments show that magnitude smoothing is superior to phase smoothing and that the latter turns out to be only detrimental to the signal quality. We provide some examples on natural speech and audio signals in the context of compression.