A multistable transfluxor memory for purposes in telephony

Multistable transfluxors may be used to construct memories for call-numbers such as are needed in telephony. The following described solution uses a transfluxor which can be set into ten different magnetic states by either a number of current pulses (one to ten) of constant amplitude and length or by single pulses of graded length. The transfluxor can be read out nondestructively. Reading may be performed to produce either a number of output pulses (1 to 10) or a single pulse of varying length corresponding to the stored flux. If in the latter case the read pulse generator has a repetition frequency of 10 Hz, the output pulses will be suitable for telephone dialing purposes after being shaped by a monostable circuit. In this article the principle of the device is described together with an application-a memory for a three-digit call-number.