Multiplex telemetering system

A multiplex telemetering system for transmitting a group of electrical data signals, each representing a distinct analog value, over a common channel to a remote receiving terminal, said system comprising:

• A. a transmitter including a commutator formed by a series of individually actuatable switches for sequentially supplying said analog data signals to said common channel;
• B. a receiving terminal including a commutator sequentially distributing the analog data signals received from said common channel to separate sub-channels, the commutator having a like series of switches, and
• C. apparatus synchronizing the operation of the transmitter and receiver commutators and including an address generator disposed at the receiving terminal to cyclically produce a series of multi-bit code values, the number of values in the series thereof being equal the number of switches in each commutator, means to decode said series of code values to produce a series of control voltages sequentially actuating said receiver commutator switches, means to translate each value in said series of code values into a distinctive audio signal mixture composed of different frequencies representing the bits of said code, each frequency in the signal mixture representing a respective bit in the multi-bit code, means at the receiving terminal to superimpose said signal mixture on the analog data signals in said common channel, means at the transmitter to intercept said signal mixture and to segregate the frequencies thereof from each other, means responsive to said segregated frequencies to restore them to the series of code values, and means to decode the restored code values to produce control voltages synchronously actuating the transmitter commutator switches.