Abstract

AbstractTo realize analog and digital ADM (Amplitude Domain Multiplex) signal transmission systems which transmit analog and digital signals in the baseband domain by amplitude domain multiplexing, intersymbol interference caused by the low‐frequency cutoff of the transmission line is a serious problem and dc‐balancing of the signals becomes necessary. This problem has not yet been discussed. This paper describes a new ADM technique for dc‐balancing of the signals within a word by using dc‐balance mB‐nB codes for the digital signal and dc‐balance signal processing within a word for the analog signal; a practicable system design is also proposed. Moreover, dc‐balance mB‐nB codes with a small clock rate increase and RDS (running digital sum) are proposed and dc‐balance mB‐nB codes suitable for this system are specified. A method for defining the optimum amplitude ratio of the analog and digital signals, and simple word synchronization and line‐error detection by checking the digital word sum are illustrated. Finally, an example of the application to subscriber loop‐transmission systems is presented and the system effectiveness is defined.

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