Electrical audio signal processing systems and devices – Noise or distortion suppression – Interpolation
Patent
1993-10-07
1995-03-28
Isen, Forester W.
Electrical audio signal processing systems and devices
Noise or distortion suppression
Interpolation
H04B 1500
Patent
active
054024951
ABSTRACT:
There is provided an improved apparatus and method which include precisely adjustable digital circuitries employing psychoacoustic modeling so that the results obtained have a best consistency with actual human auditory perception. The apparatus comprises a first estimator for estimating a power density spectrum of an input digital audio signal to the audio system; a detector for determining a masking threshold depending on the power density spectrum of the input digital audio signal as an audible limit reflecting human auditory faculty; a second estimator for estimating a power density spectrum of an error signal representative of the difference between the input digital audio signal and its output digital audio signal from the audio system; and a third estimator for estimating the power density spectrum of the error signal which exceed the masking threshold and for calculating a perceptual spectrum distance(PSD) representative of the audio distortion.
REFERENCES:
Bradenburg et al, Second Generation Perceptual Audio Coding: The Hybrid Coder, Presented at 88th Convention of Audio Eng. Soc., Mar. 13-16, 1990.
Johnston, Transform Coding of Audio Signals Using Perceptual Noise Criteria, IEEE Journal on Selected Areas in Communications, vol. 6, No. 2 Feb 1988.
Johnston, Estimation of Perceptual Entropy Using Noise Masking Criteria, IEEE 1988.
Daewoo Electronics Co. Ltd.
Isen Forester W.
Pinsak William F.
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