# Minimally Audible Noise Shaping

@article{Lipshitz1991MinimallyAN, title={Minimally Audible Noise Shaping}, author={Stanley P. Lipshitz and John Vanderkooy and Robert A. Wannamaker}, journal={Journal of The Audio Engineering Society}, year={1991}, volume={39}, pages={836-852} }

Normal quantization or requantization noise is white, but the ear's sensitivity to low-level broad-band noise is not uniform with frequency. By adopting a suitable weighting curve to represent low-level noise audibility, one can design dithered requantizing noise shapers to approximate the inverse of the audibility curve and hence achieve the least audible noise penalty. If Fielder's modified E-weighting curve is adopted as a model of the 15-phon audibility curve, a reduction of 10.9 dB in… Expand

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#### References

SHOWING 1-6 OF 6 REFERENCES

Engineering Society Another side benefit of noise-shaped rounding vol

- preprint 2412. schemes is the increased smoothing of DAC
- 1986

Digital (and, of course, also to require a separate noise-shaper Dither," presented at the 81 st Convention of the Audio spectral optimization

- Digital (and, of course, also to require a separate noise-shaper Dither," presented at the 81 st Convention of the Audio spectral optimization

Psycho-Acoustically

- Psycho-Acoustically

powers above 10 kHz significantly upon playback

- powers above 10 kHz significantly upon playback

the dips"), .and will introduce some measure of noise

- the dips"), .and will introduce some measure of noise