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AssigneeNEC Corporation
InventorsYoshinori Rokugo, Hiroshi Asano
Estimating the term…
On multiplexing a predetermined number of lower-order multiplex digital transmission signals of a common frame period into a higher-order multiplex digital communication signal, an identification pattern (X, Y, Z) is inserted in each frame of each transmission signal. The identification patterns are specific to the respective transmission signals. The identification patterns in each frame period of the respective transmission signals are multiplexed into a single pattern (I1x, I2x, I3x, I1y, I2y, I3y, I1z, I2z, I3z) in the communication signal and used to indicate lower-order multiplex digital signal receivers to which the respective transmission signals should be directed. After the communication signal is demultiplexed into lower-order multiplex digital reception signals, the identification patterns are detected with frame synchronism established between the lower-order transmission and reception signals. Each identification pattern may consist of a preselected number of binary bits where two to the power of the preselected number should not be less than the predetermined number.
A higher-order multiplex digital signal receiver for use in combination with a plurality of lower-order multiplex digital signal receivers and in receiving a higher-order multiplex digital signal into which a predetermined number of lower-order multiplex digital transmission signals are multiplexed with a plurality of identification patterns signal, said identification patterns identifying said lower-order multiplex digital transmission signals and indicating said lower-order multiplex digital signal receivers, wherein the improvement comprises:
In a multiplex digital communication network comprising a transmitter for multiplexing a plurality of lower-order multiplex digital transmission signals into a higher-order multiplex digital transmission signal and for sending said higher-order multiplex digital transmission signal to a transmission medium as a multiplex digital communication signal and a receiver for receiving the multiplex digital communication signal from said transmission medium as a higher-order multiplex digital reception signal and for demultiplexing said reception signal into a plurality of lower-order multiplex digital reception signals which are reproductions of predetermined ones of said lower-order multiplex digital transmission signals, the improvement wherein a plurality of bit-interleaved identification patterns are included in each frame of the multiplex digital communication signal, said identification patterns identifying said lower-order multiplex digital transmission signals, said receiver comprising pattern detecting means responsive to said lower-order multiplex digital reception signals for detecting said identification patterns and distributing means arranged downstream of said pattern detecting means for distributing said lower-order multiplex digital reception signals towards the lower-order multiplex digital signal receivers in response to the identification patterns included in the respective lower-order multiplex digital reception signals.
Dependencies are inferred from the claim text.