Electrical audio signal processing systems and devices – Monitoring/measuring of audio devices
Patent
1994-08-25
1996-10-08
Brinich, Stephen
Electrical audio signal processing systems and devices
Monitoring/measuring of audio devices
381 94, H04B 1500
Patent
active
055639534
ABSTRACT:
An improved apparatus and method utilizes both frequency and time masking effects to evaluate an audio distortions so that the results obtained thereby have a best match with actual human auditory perception. A power density spectrum is first estimated for an input digital audio signal and a frequency masking threshold is determined based on the power density spectrum for the input digital audio signal. In the meantime, a power density spectrum is estimated for a difference signal, wherein the difference signal represents the difference between the input digital audio signal and an output digital signal. A perceptual spectrum distance is then determined based on the power density spectrum of the difference signal and the frequency masking threshold. Finally, the audio distortion between the input digital audio signal and the output digital audio signal is estimated by multiplying the estimated perceptual spectrum distance with a weight factor calculated by using the power density spectrums of a current frame and its at least one previous frame of the input digital audio signal.
REFERENCES:
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patent: 5402495 (1995-03-01), Kim
K. Brandenburg et al. `"NMR" and Masking Flag: Evaluation of Quality Using Perceptual Criteria`, Proc. AES 11th Int. Conf., pp. 169-179, May 1992.
T. Thiede et al. "Mode of operation and features of methods for the auditorily correct evaluation of audio signals with reduced bit rates" Rundfunktechnische Mitteilungen, vol. 38, pp. 102-114, Jun. 1994.
P. Noll "Wideband Speech and Audio Coding" IEEE Communications Magazine, vol. 31, pp. 34-44, Nov. 1993.
Brinich Stephen
Daewoo Electronics Co. Ltd.
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