| 摘要 |
The invention relates to an apparatus for interfacing a multi-channel digital link and a plurality of analog lines in telephone systems. A TDM bus system (33) is provided between a digital link interface circuit (31) and analog line interface circuits (32) for transferring user information signals in two directions. A multi-channel digital signal processing unit (35) is connected to the TDM bus system (33) for selectively signal processing the information signals transferred on the TDM bus system. Which information signals are selected for signal processing and which signal processing function is performed on each specific selected information signal is determined by a software of the apparatus. The apparatus is very flexible and scaleable, as it is very easy to add, modify or completely change the signal processing functions by a simple software change without redesigning and changing the hardware. Typical functions could be analog inband signalling processing, voice equalization, echo cancellation, echo suppression, tone suppression, dual-tone multi-frequency (DTMF) detection and DTMF generation.
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