Abstract: Method and apparatus allows accurate detection of voice presence on a digitized communication line even in the presence of tone signals. The method includes analyzing digitized communication input signals by current blocks of 20ms, to define the stationary or non stationary state of any current block. Then an analysis on the states of the M last 20ms blocks allows the final decision on voice presence.

Abstract: A system and method for minimizing power consumption in personal computers and for controlling the power requirements of a random access memory based upon the actual RAM requirements of given software application. Using this method and system, a predetermined number of rows of RAM storage capacity may be refreshed at any given time and at a controlled refresh frequency after a central processing unit has read a given software program to determine its data storage requirements. A novel RAM control system is connected between the output of the central processing unit and one or more inputs to the RAM storage stage and is operative in a novel manner to generate RAM row refresh signals to only a selected number of rows of memory cells within the random access memory stage.