IMPROVED MAGNITUDE RESPONSE AND TEMPORAL ALIGNMENT IN PHASE VOCODER BASED BANDWIDTH EXTENSION FOR AUDIO SIGNALS

摘要

AN APPARATUS FOR GENERATING A BANDWIDTH EXTENDED AUDIO SIGNAL FROM AN INPUT SIGNAL, COMPRISES A PATCH GENERATOR FOR GENERATING ONE OR MORE PATCH SIGNALS FROM THE INPUT SIGNAL, WHEREIN THE PATCH GENERATOR IS CONFIGURED FOR PERFORMING A TIME STRETCHING (1800, 1808) OF SUBBAND SIGNALS FROM AN ANALYSIS FILTER BANK, AND WHEREIN THE PATCH GENERATOR FURTHER COMPRISES A PHASE ADJUSTER (1806) FOR ADJUSTING PHASES OF THE SUBBAND SIGNALS USING A FILTERBANK-CHANNEL DEPENDENT PHASE CORRECTION. (FIG. 9)