Xerox Corporation

Other

Wilbur E DuVall

William D Turner

Harold M Anderson

David H Hartke

Jack E Shemer

David Cronshaw

James R Keddy

Warren M Sterling

Norman E Marcum

An instrument (10) for the treatment of incontinence by exercise of the muscle group that includes the puboccygeous muscle furnishes electrical energy to induce muscle contraction. Energy is provided according to a pre-established exercise program at energizing rings (16, 18) at the forward, insertion section of the instrument. All variables of the exercise program are pre-established by internal electronic circuitry (FIG. 4) except energy level. Control of energy level is left to the user at touch switch elements (20, 22, 24) at the rear of the instrument.

Muscle contraction stimulation

The number of data tracks or positions that a transducer can access or track is increased, beyond that conventionally permitted by the transducer conductor spacing, by first providing a plurality of signals corresponding in number to the factor by which the tracking capacity of the transducer is to be increased, with all signals having a common frequency equal to that of the drive signals applied to the transducer stator windings and with each signal being phase delayed relative to the other signals by one or more clock increments, then accessing the signal having a phase corresponding to the data track to be tracked, providing from that accessed signal a plurality of additional relatively phase delayed signals, and applying each of the later phase delayed signals to one of a plurality of phase detectors each of which also receives an input corresponding to the squared transducer rotor signal whereby the phase detectors provide at their output width modulated signals having a low frequency component corresponding to the rotary position signal.

Transducer system with increased tracking capability

To generate a signal having at all times an amplitude directly proportional to the velocity of relatively moving members, a plurality of phase displaced position indicative signals are first generated. A pair of the position signals that are phase displaced by 90.degree. are then differentiated to provide velocity signals. Each velocity signal is applied in both its regular form and its inverted form to an analog multiplexer which receives the other position signals as control signals. The composite output of the multiplexer, after filtering to remove high frequency glitches due to sampling, is a signal having an amplitude at all times directly proportional to velocity.

Transducer system with velocity signal generation

Settling problems of a closed loop servo system are substantially eliminated by switching the servo system into position mode operation only when there is zero position error and zero velocity error. The fast and clean settling is accomplished by digitizing the instantaneous amplitude of the position signal when the difference count has decremented to zero and using that digital value as the address of a square root look up table which provides for each instantaneous amplitude of the position signal a digital signal indicative of the instantaneous velocity required to effect rapid settling at the rest position. The digitized velocity signal is converted to an analog signal by a digital to analog converter for energization of the drive motor. The servo system tracks the instantaneous amplitude of the position signal until both position signal amplitude and velocity are zero, at which time the system is mechanically stopped and stable, and then the system is, for the first time, switched to conventional position mode operation. Prior to the time that the difference count is decremented to zero, the difference or track count is used as the address of the look up table to provide digitized velocity signals. There is a change in the scale of the digital to analog converter when the difference count becomes zero so that all of the velocity square root curve used for positioning when the difference count was above zero can be used when the difference count is zero.

Servo capture system

A thermally controlled servo system in which a member supporting the drive for a device to be accurately positioned is moved relative to a stationary support member in response to changes in temperature of an elongated, tensioned member. Changes in temperature of the tensioned member are achieved by regulating the current flow through the tensioned member in accordance with a control signal derived from an error signal generated by the device to be positioned.

Thermal servo system for mechanical positioning

A distributed function processing system utilizing a conventional microprocessor operated as a text processor in combination with a plurality of other autonomous processing devices arranged to operate in a coherent processing system. One of the autonomous processors which is a memory control processor serves to periodically overlay a random access accelerator memory with the contents of a main memory system and concurrently resolves conflicts among various other autonomous memory service requests. This processor, therefore, accommodates the data rates of the main memory. The other processor is a display processor which generates signals to a video display system to provide a visual interface to the user and is therefore tied to the video rate. Accordingly, the processing burden is distributed within processors entailing differing rates operating autonomously. The memory control processor resolves and accommodates all of the memory service requests in the system and also performs control operations to support high speed I/O devices. Logic is provided to handle the other interrupts. Also, there is page mapping for context switching of a reference page and repeating logic for decoupling this processor from the other processors. This arrangement allows convenient expansion into plural work stations each sharing a common memory.

Soft display word processing system with multiple autonomous processors

A keyboard encoding system which utilizes electronic hysteresis to prevent undesired key stroke encoding. The output of a capacitive switch matrix is supplied to a sense amplifier which has its sensitivity increased if a particular switch of the switch matrix was closed the last scan cycle. The status of the switches of the switch matrix during the last scan cycle is provided by a shift register having a number of stages equal to the number of switches of the matrix. The sense amplifier includes a comparator which receives an input indicative of the state of a particular matrix switch during the present scan cycle and an input from the shift register indicative of the status of the particular matrix switch the previous scan cycle. If the input from the shift register is high, the sensitivity of the sense amplifier is increased.

Keyboard encoding system with electronic hysteresis

A keyboard encoding system having a pause built into the repeat key function. A multi-stage counter has a first of its stages coupled to a first bistable switching device and another, higher order stage coupled to a second bistable switching device. When a repeat key is closed, the counter is incremented past the first stage to the higher order stage which renders the second bistable switching device conductive and, due to the interconnection between the switching devices, primes the first bistable switching device. When the counter again increments to the first stage, the first bistable switching device conducts to produce, after the pause provided by the system, a repeat key encoding signal.

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Victorville, CA, United States of America

Wilbur E DuVall