Method and apparatus for encoding-decoding a digital signal

Details Method and apparatus for encoding-decoding a digital signal Method and apparatus for encoding-decoding a digital signal

1992-04-21

1994-11-08

Logan, Sharon D.

Coded data generation or conversion

Digital code to digital code converters

341 51, H03M 700

Patent

active

053630963

ABSTRACT:
After a windowing operation h(n) performed by space-time weighting of the samples, a method and an apparatus for encoding-decoding a digital signal comprising a sequence of samples x(n) consists in performing a modified discrete cosine transform of the samples to calculate the even order transformation coefficients: ##EQU1## for k .epsilon.[0, . . . , N/2-1] with YN-k=-Yk-1 The coefficient Y2k are expressed in the form of an invertible complex transformation: ##EQU2## for k=0, . . . , N/4-1 with y'n=x2n.h2n y"n xN-2n-1.hN-2N-1
W4N=cos(2.pi./4N)+j.sin(2.pi./4N) The invertible comples transformation is calculated using an auxiliary calculation equation: ##EQU3## with: zn=(y2n-yN/2-1-2n)+j(yN-1-2n+yN/2+2n) The invention is applicable to encoding and decoding digital audio or video signals.

REFERENCES:
D. Reynolds et al., "Analysis/Synthesis Image Coding System Based on Time Domain Aliasing Cancellation", Proceedings of the Southeastcon 1989-Energy and Information Technologies in the Southeast, vol. 2, pp. 866-870, 1989.
A. Johnson et al., "Adaptive Transform Coding Incorporating Time Domain Aliasing Cancellation", Speech Communication, vol. 6, No. 4, pp. 299-308, Dec. 1987.
J. Princen et al., "Subband/Transform Coding Using Filter Bank Designs Based on Time Domain Aliasing Cancellation", Proceedings of 12th International Conference on Acoustics, Speech, and Signal Processing, vol. 4, pp. 2161-2164, Apr. 1987.
J. Princen et al., "Analysis/Synthesis Filter Bank Design Based on Time Domain Aliasing Cancellation", IEEE Transactions on Acoustics, Speech and Signal Processing, vol. 34, No. 5, pp. 1153-1161, Oct. 1986.
P. Duhamel, "Implementation of Split-Radix FFT Algorithms for Complex, Real and Real-Symmetric Data", IEEE Transactions on Acoustics, Speech and Signal Processing, vol. 34, No. 2, pp. 285-295, Apr. 1986.
P. Dunhamel, "Algorithms Meeting the Lower Bound on the Multiplicative Complexity of Length 2n DFT's and Their Connection with Practical Algorithms", IEEE Transactions on Acoustics, Speech and Signal Processing, vol. 38, No. 9, pp. 1504-1511, Sep. 1990.

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