| 摘要 |
A telephony system sends an outgoing message to a caller and expects to receive a reply message. In order to be prepared to process the reply, a speech input unit is activated by a subliminal keying signal. The keying signal is provided in time relation to the outgoing message on the same transmission path as the outgoing message. The keying signal is both subliminal, so it is "heard" by the speech input unit and not by the caller, and has a signal pattern unlike normal speech, so as to avoid false keying of the input unit. The input unit can thus be activated at an appropriate time to be ready to process a reply. This avoids inefficiencies of a continuously activated input unit and loss of opening elements of a reply message due to the latent period of a voice-activated input unit.
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