PCM to PAM and PAM to PCM converter - has dual wire transfer line switched for both incoming and outgoing PAM signals

摘要

The PCM/PAM and PAM/PCM converter unit is located in a codec that has an input for PAM signals and an output for PAM signals. A two-wire line is used for supplying and carrying away the analog signals and is switched in at different times. The two-wire line connects at different times with a discharge circuit. The input receiving analog signals and the output delivering analog signals can be coupled to the two-wire line via a specially operated switch. The line is connected to the discharging circuit via another switch.