Abstracr-Two new digital transmultiplexers intended for commercial use have been developed. One transmultiplexer performs a bilateral conversion between two 12-channel FDM'group signals and a 24-channel PCM carrier signal. The other mutually connects two 60channel FDM sllpergroup signals and five 24-channel or four 30channel PCM signals. Both exploit a block processing digital SSB-FDM multiplex/demultiplex scheme employing a cascade of an FFT processor and a set of complex coefficient digital fhters. They have been built using newly developed high-level DSP LSI chips. Algorithmic considerations, developed LSI architecture, and equipment configuration ape described as well as digital processor design details and measured performance.

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