I need a low pass filter with an abrupt shape between pass band and
stop band (like Cauer or elliptical) but with a constant group delay
in the passband, like Bessel. Does something like that really exist ?

thank you,
Vasile
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist