An acoustic echo path change detection apparatus comprising: an acoustic echo canceller; time domain path change detection functionality means in communication with the acoustic echo canceller, said time domain path change detection functionality means arranged to: detect a change in a near-end acoustic echo path responsive to a time domain analysis of a near-end signal and a signal output by the acoustic echo canceller; and output an indication of said detected change, CHARACTERIZED BY: frequency domain path change detection functionality means in communication with the acoustic echo canceller, said frequency domain path change detection functionality means arranged to: detect a change in the near-end acoustic echo path responsive to a frequency domain analysis of a far-end signal and the signal output by the acoustic echo canceller; and output an indication of said detected change, and combination path change detection functionality means arranged to: determine a first function of said output indication of said time domain path change detection functionality means and said output indication of said frequency domain path change detection functionality means; and output said determined first function; and adaptation control functionality means arranged, responsive to said output first function, to adjust the operation of said acoustic echo canceller. an acoustic echo canceller; time domain path change detection functionality means in communication with the acoustic echo canceller, said time domain path change detection functionality means arranged to: detect a change in a near-end acoustic echo path responsive to a time domain analysis of a near-end signal and a signal output by the acoustic echo canceller; and output an indication of said detected change, CHARACTERIZED BY: frequency domain path change detection functionality means in communication with the acoustic echo canceller, said frequency domain path change detection functionality means arranged to: detect a change in the near-end acoustic echo path responsive to a frequency domain analysis of a far-end signal and the signal output by the acoustic echo canceller; and output an indication of said detected change, and combination path change detection functionality means arranged to: determine a first function of said output indication of said time domain path change detection functionality means and said output indication of said frequency domain path change detection functionality means; and output said determined first function; and adaptation control functionality means arranged, responsive to said output first function, to adjust the operation of said acoustic echo canceller. detect a change in a near-end acoustic echo path responsive to a time domain analysis of a near-end signal and a signal output by the acoustic echo canceller; and output an indication of said detected change, CHARACTERIZED BY: frequency domain path change detection functionality means in communication with the acoustic echo canceller, said frequency domain path change detection functionality means arranged to: detect a change in the near-end acoustic echo path responsive to a frequency domain analysis of a far-end signal and the signal output by the acoustic echo canceller; and output an indication of said detected change, and combination path change detection functionality means arranged to: determine a first function of said output indication of said time domain path change detection functionality means and said output indication of said frequency domain path change detection functionality means; and output said determined first function; and adaptation control functionality means arranged, responsive to said output first function, to adjust the operation of said acoustic echo canceller. detect a change in the near-end acoustic echo path responsive to a frequency domain analysis of a far-end signal and the signal output by the acoustic echo canceller; and output an indication of said detected change, and combination path change detection functionality means arranged to: determine a first function of said output indication of said time domain path change detection functionality means and said output indication of said frequency domain path change detection functionality means; and output said determined first function; and adaptation control functionality means arranged, responsive to said output first function, to adjust the operation of said acoustic echo canceller. determine a first function of said output indication of said time domain path change detection functionality means and said output indication of said frequency domain path change detection functionality means; and output said determined first function; and adaptation control functionality means arranged, responsive to said output first function, to adjust the operation of said acoustic echo canceller.