Abstract: A motor control system in which direct current is sequentially applied to portions of the motor stator windings in response to rotor position signals generated by Hall effect devices until the rotor has reached a desired angular velocity corresponding to the frequency of a source of reference pulses, at which time the portions of the stator windings are driven in a synchronous manner by pulses having a fixed duration and the same frequency as the reference pulses. In the synchronous mode the Hall effect signals are used only in conjunction with circuitry to determine whether or not the rotor is continuing to rotate at the desired, synchronous velocity. The motor is stopped by reverse application of direct current drive to the windings in the direct current drive mode and, again, in accordance with the position signals output from the Hall effect devices.

Abstract: A medialess dictation system for storing and retrieving audio information, and eliminating media handling requirements as well as recording and transcribing delays. During a recording operation, incoming audio information from an operator station is converted to digital information and temporarily stored in a limited capacity store. From the temporary store, this information is indexed and stored in a primary store. For a transcribing or playback operation wherein desired portions of previously recorded and indexed information are to be retrieved, the desired indexed information is addressed and transferred back to the temporary store. Thereafter, it is converted back to audio and output through the operator station.