Audio signal time scale modification

Details Audio signal time scale modification Audio signal time scale modification

2005-09-13

2005-09-13

Mei, Xu (Department: 2644)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Digital audio data processing system

C381S119000

Reexamination Certificate

active

06944510

ABSTRACT:
A method of time-scale modification processing of frame-based digital audio signals based on Synchronous Overlap Addition in which an original frame of digital audio is copied, the original and copied frames are partly overlapped to give a desired new duration to within a predetermined tolerance, the extent of overlap is adjusted within the predetermined tolerance by reference to a cross correlation determination of the best match between the overlapping portions of the original and copied frame; and a new audio frame is generated from the non-overlapping portions of the original and copied frame and by cross-fading between the overlapping portions. To reduce the computational load, a profiling procedure is applied to the original and copied frame prior to cross correlation, such as to reduce the specification of each audio frame portion (100) to a finite array of values (101–106), and the cross correlation is then performed in relation only to the pair of finite arrays of values. To further simplify computation, the values (101–106) are identified as maxima or minima for the signal and are both stored and processed as the only non-zero values in a matrix representation of the frame. A digital signal processing apparatus embodying this technique is also provided.

REFERENCES:
patent: 4689697 (1987-08-01), Wilkinson
patent: 5216744 (1993-06-01), Alleyne et al.
patent: 5641927 (1997-06-01), Pawate et al.
patent: 5842172 (1998-11-01), Wilson
patent: 6092040 (2000-07-01), Voran
patent: 6266003 (2001-07-01), Hoek
patent: 0392049 (1990-10-01), None
patent: 0865026 (1998-09-01), None
“Non-Parametric Techniques for Pitch Scale and Time Scale Modification of Speech”, by E. Moulines an DJ. Laroche, Speech Communications, vol. 16, 1995, pp. 175-205.
“An Edge Detection Method for Time-Scale Modification of Acoustic Signals”, by Rui Ren, Hongkong University of Science and Technology, Computer Science Dept. Viewed at : HTTP://WWW.CS.UST./HK/˜RREN/SOUND—TECH/tsm—PAPER—LONG.HTM.
“High Quality Time-Scale Modification for Speech”, by S. Roucos and A. Wigus, IEEE Int'l Conf. on Acoustics, Speech and Signal Processing, Mar. 1985, pp. 493-496.
“Computationally Efficient Algorithm for Time-Scale Modification (GLS-TSM)” by S. Yim and B.I. Pawate, IEEE Int'l Conf. on Acoustics, Speech and Signal Processing, 1996.
“Time-Scale” Modification of Speech by Zero-Crossing Rate Overlap-Add (ZCR-OLA) by B. Lawlor and A. Fagan, IEEE Int'l Conf. on Acoustics, Speecha nd Siganl Processing.

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