Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Patent
1996-12-06
1999-01-05
Chin, Stephen
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
704203, 36440001, H04B 166, G10L 302
Patent
active
058570004
ABSTRACT:
A time domain aliasing cancellation (TDAC) apparatus and its signal processing method to be used with the AC-3 high-fidelity audio signal compression system of the MPEG-2 international video standard. This invention proposes two preferred embodiments to realize the compression encoding and decoding processes of the TDAC apparatus. The first preferred embodiment employs a data reordering technique to change the TDAC encoding to a discrete cosine transform (DCT), and furthermore, it changes the TDAC decoding to a inverse discrete cosine transform (IDCT). This implementation has the least computational complexity. The second preferred embodiment utilizes data reordering to change the TDAC encoding and decoding into a type IV discrete cosine transformation, and then converts the DCT transformation into a 2nd order infinite impulse filter. The multiplication coefficients in this filter can be fixed to improve the precision and also to reduce the amount of computations. This implementation of the TDAC apparatus has the simplest hardware structure. Both preferred embodiments are suitable for implementation using VLSI technology.
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patent: 5640421 (1997-06-01), Sonohara et al.
Princen, J.P. and Bradley, A.B., "Analysis/Synthesis Filter Bank Design Based on Time Domain Aliasing Cancellation," IEEE Trans. on Acoustics, Speech and Signal Processing, vol. ASSP-34, No. 5, pp. 1153-1161, Oct. 1986.
Duhamel, P., Mahieux, Y. and Petit, J.P., "A Fast Algorithm for the Implementation of Filter Banks Based on `Time Domain Aliasing Cancellation`," IEEE Int'l Conf. on Acoustics, Speech and Signal Processing, pp. 2209-2212, May 1991.
Din-Yuen Chan
Jar-Ferr Yang
Chin Stephen
Gluck Jeffrey W.
National Science Council
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