Stepless pulse count switching

摘要

An up-down counter is fed pulses generated manually and/or automatically from either or any of two or more command sources. Gating circuitry ahead of the up-down counter may be used to enable counts from only one source at a time. The output of the counter represents the magnitude of the parameter to be controlled. The purpose is to transfer control of a parameter to any of several command sources without changing the value of the parameter, thereby achieving "stepless" switching. Only one counter is needed regardless of the number of command sources, no synchronizing circuitry is required, and switching is provided with no steps or delays. Multiple command sources may be active simultaneously when command source input gating is not used ahead of the up-down parameter magnitude counter.