A technique used on some high capacity, long haul frequency-division multiplexed (FDM) analog voice circuits to improve the efficiency of bandwidth utilization. Through a technique known as silence suppression, TASI senses periods of inactivity in a voice conversation, and inserts the conversation of another speaker into that period of silence. When the first speaker again becomes active,TASI inserts that conversation into another channel where it has detected a period of silence, and so on. If too many speakers are active, voice signals are clipped and quality drops. TASI is no longer used, because all, or nearly all, long haul voice circuits are digital. TASI did, however, form the basis for digital speech interpolation (DSI), which is widely used in contemporary voice networks. See also analog, bandwidth, channel, digital, DSI, and FDM.