IMPROVING TRANSIENT PERFORMANCE OF LOW BIT RATE AUDIO CODIG SYSTEMS BY REDUCING PRE-NOISE

摘要

Advanced distortion artifacts in the signal transients in the audio signal streams are processed by a transform-based low bit rate audio coding system employing coding blocks are coded block and detecting a transient of the audio signal stream that reduces the time duration of the distortion artifacts It is reduced by the step of shifting the temporal relationship with respect to transients. The audio data are transient free in the decoded audio signal is time-scaled in a way that re-set position in time of the previous quantized transform-based low bit rate audio encoder in order to reduce the amount of noise. Alternatively, or in addition, a transient of the audio signal stream is detected and a time compression such that a portion of the distortion artifacts is reduced period duration of the distortion artifacts.