| 摘要 |
An interface circuit is provided to convert serial, 30 channel, compressed, sign magnitude FDM-PCM data provided by a pair of voice communication codecs (code/decode) into parallel, 60 channel, expanded (linear), 2's complement PCM data, so that it can be used in an FDM/TDM processor. The conversion process is reversed on the return of data from the FDM/TDM processor to the codecs. A unique method of read/write and memory address control provides specific ordering of data and alternating two-way data flow in rapid succession.
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