73M2901CE Programming the Imprecise Call Progress Monitor Filter

Abstract

The Teridian 73M2901CE single-chip, ITU-T V.22bis, 2400bps modem provides a set of precise and imprecise filters. This application note describes how the set of imprecise filters can be programmed to detect custom frequencies. Specially, the article explains how to modify the 73M2901CE Imprecise Call Progress Monitor Filter to act as a general-purpose signal-detection mechanism. Read full article.