Operational status controller for echo canceling

摘要: An apparatus for controlling the operational status of echo canceling in an canceler is disclosed. A digital signal processor (DSP) module (52) configured to provide two bandlimited filters (66, 68). CAT filter (66) detects exclusive presence a continuity assurance. Test (CAT) tone, and disable (68) tone. Outputs from DSP couple controller (64), control output (64) couples (54). The causes (54) either or bypass canceling. Upon detection tone (106), enables (88). After disappears (90), monitors determine whether being transmitted (94). If detected, disables (100). (102), (106).