Digital data switching system utilizing voice encoding and decoding circuitry

摘要

The specification discloses a system for transmitting analog signal information via telephone lines which includes an encoding station for converting the analog signal information into a series of pulses spaced apart by periods proportional to the magnitude of the analog signals. The encoding station transmits digital dialing data and the series of pulses via a telephone line to a central switching station which is operable to switch the data and pulses between a plurality of telephone lines. Decoding circuitry associated with a plurality of transmitting telephone lines operates to produce addresses corresponding to telephone lines presenting information to be switched. Contention circuitry operates to resolve simultaneous information presentation to the system. A random access memory is associated with the decoding circuitry. Circuitry is responsive to dialing data in order to store the identity address of the receiving telephone line in the random access memory. Accessing circuitry is responsive to a pulse transition for causing the memory to generate an address code. Decoding circuitry is responsive to the output of the memory for selection of the receiving telephone line. Circuitry is responsive to the output of the decoding circuitry for transmitting a representation of the pulse transition to the desired receiving telephone line and to a remote station. A decoding circuit is located at the remote station for converting the series of pulses into representation of the original analog signal information.