Methods and systems for avoiding partial collapse in multi-block audio coding

摘要

Embodiments are described of a multi-block coding scheme for an audio signal to prevent partial collapse conditions from causing pre-echo compression artifacts. An audio codec includes a segmentation component partitioning the audio signal into a plurality of tiles, wherein each tile comprises data from a particular segment of time and a particular set of frequencies of the audio signal; a band energy component determining an energy value for each tile corresponding to a signal component in a respective tile; an encoder flag tracking component marking a tile as not collapsed or collapsed based on the energy value in that tile; and a decoder flag tracking component filling all tiles marked as collapsed with pseudorandom noise at an estimated energy level.

主权项

1. A method of coding an audio signal, comprising:
partitioning the audio signal into a plurality of tiles, wherein each tile comprises data from a particular segment of time and a particular set of frequencies of the audio signal; determining an energy value for each tile corresponding to a signal component in a respective tile; marking a tile as not collapsed or collapsed based on the energy value in that tile; and filling all tiles marked as collapsed with pseudorandom noise, wherein at least some of the plurality of tiles are subject to a defined change of a time-frequency resolution of each respective tile that causes to tile to increase either a time (T) resolution of the respective band or a frequency (F) resolution of the respective tile.