| 摘要 |
A switching system (10) is modified to provide, in addition to conventional connections (110+111) between ports (100, 103), eavesdropping connections that couple only one-half of a conventional bidirectional connection between a pair of ports to a third port (102). If the pair of ports serves an adjunct processor such as a voice-mail system (11) and a user voice terminal (13), a voice- or speech-recognition unit (12) serving the adjunct processor may be connected to the third terminal to receive thereat only the transmissions (112) of the user voice terminal without the unwanted transmissions of the adjunct processor. If the transmissions of the user voice terminal are polluted with echoes of the adjunct processor transmissions, then each half of the conventional connection between the adjunct processor and the user voice terminal may be connected to a different one of two ports (102, 103) serving the voice- or speech-recognition unit, whereby the recognition unit is able to receive the polluted transmissions (112) of the user terminal separately from the transmissions (113) of the adjunct processor and use the latter to perform echo cancelling functions on the former so as to obtain only the transmissions of the user voice terminal without the unwanted transmissions of the adjunct processor.
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