Temporal Transient Localization for Enhanced Pre-Echo Suppression
Wen Hua Ma, Jin Hua Xu, Yu Li You · Applied Mechanics and Materials · 2013
A specially designed short window of reduced effective size and other supporting windows, as used in a switched MDCT audio codec, are sequenced in such a way that this special window is placed around transient samples, thereby providing transient localization while leaving frequency resolution unchanged. Pre-echo is better suppressed because transient localization reduces thespread of both quantization noise and high bitrates associated with transients.The overheads include one or two additiona lbits and a short procedure, both for windows equencing, and more memory for storing additional window functions.