Process for reducing the pre-echoes or post-echoes affecting aud

Details Process for reducing the pre-echoes or post-echoes affecting aud Process for reducing the pre-echoes or post-echoes affecting aud

1996-10-04

1998-02-10

Kuntz, Curtis

Electrical audio signal processing systems and devices

Dereverberators

379406, H04B 320

Patent

active

057177686

ABSTRACT:
For various values of an integer p, short-term discrete Fourier transforms X(p,k) and X.sub..tau. (p,k) of the audio signal shifted by pR samples and of the audio signal shifted by pR+.tau. samples are respectively calculated, R denoting a predetermined integer and .tau. denoting a time shift between the echo and the portion of signal which gave rise to it, a corrected signal is calculated in the frequency domain by nonlinear transformation of X(p,k) taking account, for the various values of the frequency index k, of a value representative of an attenuation factor relating to the echo and of X.sub..tau. (p,k), and a short-term component of a corrected signal is calculated in the time domain by short-term inverse Fourier transform of the corrected signal in the frequency domain. The corrected signal in the time domain is then formed by weighted summation of its short-term components. Application to the digital reprocessing of analog recordings.

REFERENCES:
patent: 3786188 (1974-01-01), Allen
patent: 5513265 (1996-04-01), Hirano
patent: 5528687 (1996-06-01), Tanaka et al.
IEEE Transactions on Speech and Audio Processing, vol.3, n.degree.1, Jan. 1995--"Evaluation of short-time spectral attenuation techniques for the restoration of musical recordings"--O. Cappe, J. Laroche--pp. 84-93.
Journal of the Audio Engineering Society, vol. 40, n.degree. 10, Oct. 1992--"Restoration of old gramophone recordings"--Vaseghi S V et al--pp. 791-801.
Journal of the Audio Engineering Society, vol. 30, n.degree. 4, Apr. 1982--"On disk-record echo phenomena"--O. Stephani--pp. 217-224.
IEEE International Conference on Acoustics, Speech and Signal Processing, vol. 4, Mar. 1992--"Low-delay frequency domain LMS algorithm"--O.A. Amrane et al--pp. 9-12.
Patent Abstracts of Japan, vol. 017, n.degree. 378 (E-1398), Jul. 1993.
IEEE Communications Magazine, vol. 28, n.degree. 1, Jan. 1990--"Echo cancellation and applications"--Murano K et al--pp. 49-55.

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