Patent ID: 6781624
Filing Date: 2004-08-24
Classification: H04N

Abstract:
A signal processing apparatus comprising,a plurality of signal sources; specific value detection means for outputting a maximum or minimum signal of said plurality of signal sources, said specific value detection means having a function of sequentially outputting individual signals from said plurality of signal sources and comprising a plurality of voltage follower circuits connected to said plurality of signal sources, respectively, wherein an output portion of each of said plurality of voltage follower circuits comprises a source follower circuit; and driving means for switching the function of said specific value detection means, said driving means switching the function by commonly connecting output portions of said plurality of voltage follower circuits to an output line to output the maximum or minimum signal to said output line and sequentially connecting the output portions of said plurality of voltage follower circuits to said output line to sequentially output the individual signals to said output line, wherein said output line has a constant current source, and wherein when the maximum or minimum signal is to be output, a constant current source of said source follower circuit is turned off and said constant current source of said output line is turned on, and when the individual signals are to be output, said constant current source of said source follower circuit is turned on and said constant current source of said output line is turned off.