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Removal of Birdie Artifact in Perceptual Audio Coders

The birdie artifact is the predominant factor affecting audio quality of perceptual coders operating at very low bit rates. Conventional approaches to overcome the birdie artifact involve use of Low Pass Filters to reduce the amount of signal to quantize. This approach does not eliminate the birdie artifact if the effect is seen in the in-band components. This paper proposes a new algorithm to overcome the birdie artifact and hence improve the audio quality. The proposed algorithm modifies the bit allocation strategy such that the critical bands are preserved, while still maintaining the Perceptual distortion criteria. Results of Spectrogram analysis are presented.

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