Techniques for power efficient and smart echo cancellation

An apparatus for determining filter coefficients for an echo compensation filter for reduction of an echo signal in a communication channel upon a basis of a received signal, the received signal being a receivable version of a known reference signal transmittable over the communication channel, the receivable version of the reference signal being affected by the echo signal, an impulse response of the communication channel extending over N time intervals, the apparatus comprising:

• a finite impulse response filter comprising a set of M+1 filter coefficients, the finite impulse response filter being configured to filter values of the reference signal using the M+1 filter coefficients to obtain a first filtered reference signal;
• an interval selector configured to select values of the reference signal associated with a k-th time interval of the N time intervals;
• M delay elements configured to successively delay the selected values of the reference signal, the M delay elements being arranged after the interval selector;
• and
• M+1 error estimators, a first error estimator of the M+1 error estimators being coupled to an output of the interval selector, each of the remaining M error estimators being coupled to an output of a respective delay element, the M+1 error estimators being configured to determine the M+1 filter coefficients such that a measure of a deviation between the first filtered reference signal and the received signal is minimized.