Method of and apparatus for performing time-scale modification o

Details Method of and apparatus for performing time-scale modification o Method of and apparatus for performing time-scale modification o

1994-01-25

1997-05-13

MacDonald, Allen R.

G10L 302

Patent

active

056300131

ABSTRACT:
An apparatus for transforming an input signal having a time length L into an output signal having a time length .alpha.L in accordance with a given time-scale modification ratio .alpha., including a correlator for calculating a value of a correlation function between a first signal and a second signal having a time length T and for determining a time delay T.sub.c at which the value of the correlation function becomes the greatest; an adder for adding the first signal multiplied by a first window function to the second signal multiplied by a second window function with a displacement of the time delay T.sub.c ; and an outputting circuit for selectively outputting the output of the adder and a third signal succeeding the output of the adder so that the sum of a time length of the output of the adder and a time length of the third signal is substantially equal to a time length defined by the time-scale modification ratio .alpha., the time delay T.sub.c and the time length T.

REFERENCES:
patent: 3786195 (1974-01-01), Schiffman
patent: 4246617 (1981-01-01), Portnoff
patent: 4464784 (1984-08-01), Agnello
patent: 4722009 (1988-01-01), Nakama et al.
patent: 4864620 (1989-09-01), Bialick
patent: 5175769 (1992-12-01), Hejna et al.
patent: 5341432 (1994-08-01), Suzuki et al.
Search Report for European Appl. 94101057.1, mailed Dec. 8, 1994.
Suzuki et al, "Time Scale Modification of Speech Signals Using Cross-Correlation," IEEE 1992, Intl' Conference on consumer Electronics Digest of Tech. Papers, Jun. 2-4, 1992, pp. 166-167.
Takasugi et al; "Function of SPAC (Speech Processing System by Use of Autocorrelation Function) and Fundamental Characteristics", IECE of Japan, vol. E62, No. 3., pp. 153-154.
Jianping, "Effective Time-Domain Method for Speech Rate Change", May 1988, pp. 339-346, IEEE Transactions on Consumer Electronics, vol. 34, No. 2.
Makhoul, "Time-Scale Modification in Medium to Low Rate Speech Coding", ICASSP 86, Tokyo, pp. 1705-1707.
Cox et al; "Real-Time Implementation of Time Domain Harmonic Scaling of Speech for Rate Modification and Coding", IEEE Transactions vol. ASSP-31, No. 1, Feb. 1983.
Beranek et al; "High Quality Time-Scale Modification for Speech", IEEE, 1985, pp. 493-496.
Suzuki et al., "Time-Scale Modification of Speed Signals using Cross-Correlation Function", IEEE 1991, Jun. 5, 1992, pp. 357-363.

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