Title :
Anti-aliasing VLSI digital filters for video signal coders
Author :
Chiappano, G. ; Raveglia, D.
Author_Institution :
Italtel Sit, Milan, Italy
Abstract :
An antialiasing digital filter for video coders, meeting the CCIR Rec. 601 requirements for A/D (analog-to-digital) interfaces, is described. The input signal is oversampled at a frequency that is four times the nominal one; this cuts the complexity of the analog front end filter down to a simple RC stage. Furthermore the input resolution is reduced to 7 b as the eighth bit is recovered during the filtering and decimation phase. A dedicated methodology for the design of 1-D high-speed FIR filters has been developed; it includes programs for filter synthesis and optimization, for the simulation of the processing effects on a video signal, and for a semiautomatic conversion of the final circuit into a CMOS application-specific IC.<>
Keywords :
CMOS integrated circuits; analogue-digital conversion; application specific integrated circuits; circuit CAD; circuit layout CAD; digital filters; ADC; ASIC; CCIR Rec. 601 requirements; CMOS; VLSI digital filters; analog front end filter; antialiasing digital filter; application-specific IC; high-speed FIR filters; input resolution; optimization; oversampled; programs for filter synthesis; video signal coders; Circuit synthesis; Design methodology; Digital filters; Filtering; Finite impulse response filter; Frequency; Signal design; Signal resolution; Signal synthesis; Very large scale integration;
Conference_Titel :
Circuits and Systems, 1988., IEEE International Symposium on
Conference_Location :
Espoo, Finland
DOI :
10.1109/ISCAS.1988.15024
