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The time window modelled by the AEC is finite, and to maximise its performance it is important to
ensure that the reference audio is presented to the AEC time aligned to the audio being reproduced
by the loudspeakers. The diagram below highlights how the reference audio path delay and the audio
reproduction path may be significantly different, therefore requiring additional delay to be inserted into
one of the two paths, correcting this delay difference.
Figure 4-13 ADEC use case diagram
The functional blocks in the ADEC are shown below:
Figure 4-14 ADEC block diagram
Delay corrections may be applied to either microphone or reference path, to cope with reference or
loudspeaker being ahead of the other, accomplished by switching the delay into either the microphone
channel or the reference channel.
Automatic delay estimation is triggered at power-up, or if the host system configuration changes. The
process will not begin until the reference signal is present and has sufficient energy.
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