Cirrus-logic AN168 Manual do Utilizador descarregar pdf (Página 28)

AN168

28 AN168REV2

1.7.4 Acoustic coupling

The maximum acoustic coupling (across

frequency) between the speaker and the

microphone should be limited to -9 dB. This can be

tested and verified by using techniques described

earlier.

1.7.5 Training sequence

The Acoustic Echo Canceler trains only when the

far-end is talking while the near-end is silent. When

the system is in half-duplex mode, the AEC trains

whenever the receive path is active. When the

system is in full-duplex mode, the AEC does not

train during double-talk. It is only when the

near-end is silent while the far-end is talking that

the acoustic adaptive filter trains.

The Network Echo Canceler trains only when the

near-end is talking and the far-end is silent. When

the system is in half-duplex mode, the NEC trains

when the transmit path is active.

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Cirrus-logic AN168 Manual do Utilizador Página 28