An echo canceler for generating an echo replica and subtracting the echo replica
from a local input signal to create a residual signal for outgoing transmission.
An echo canceler has adaptive filters that have different computational accuracy
generating the echo replica. An evaluator coupled to the adaptive filters groups
coefficients into each of segments, and evaluating a computational accuracy information
according to the coefficients for the segments. A computational accuracy controller
in the evaluator assigns the local input signal to the adaptive filters, and adjusts
the coefficients according to the computational accuracy information.