Title :
A 2D-DCT low-power architecture for H.261 coders
Author :
Scopa, E. ; Leone, A. ; Guerrieri, R. ; Baccarani, G.
Author_Institution :
Dipartimento di Elettronica Inf. e Sistemistica, Bologna Univ., Italy
Abstract :
A low-power architecture for 2D-DCT is presented. It has been designed for portable H.261-compliant video-telephone applications, but most of the results and considerations apply to MPEG systems too. The presence of quantization in the coding process has been exploited, adapting the precision of DCT calculations to the quantization noise level. The proposed architecture has the capability of dynamically controlling power consumption by reducing the precision to the minimum required level and turning off sub-systems when they are not necessary for the computation. Compared with a standard implementation, power consumption is reduced by a factor between 7 and 10, without appreciable degradation of the transmission quality
Keywords :
digital arithmetic; discrete cosine transforms; telecommunication standards; transform coding; video coding; videotelephony; 2D-DCT low-power architecture; H.261 coders; MPEG systems; coding process; portable H.261-compliant video-telephone applications; power consumption; quantization; quantization noise level; sub-systems; Arithmetic; Clocks; Code standards; Computer architecture; Discrete cosine transforms; Energy consumption; Image coding; Quantization; Sparse matrices; Video sequences;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1995. ICASSP-95., 1995 International Conference on
Conference_Location :
Detroit, MI
Print_ISBN :
0-7803-2431-5
DOI :
10.1109/ICASSP.1995.479583
