The invention relates to fast analogue-to-digital converters having differential inputs and a parallel structure, comprising at least one network of N series resistors with value r and one network of N comparators. The series resistor network receives a reference voltage and is traversed by a fixed current I.sub.o and the row i (i varying from 1 to N) comparator essentially comprises a dual differential amplifier with four inputs; two inputs receive a differential voltage VS-VN to be converted, ...

The manipulator delivers signals characteristic of the orientation of an operating lever (2) in space. The lever is deflectable by a transverse thrust, from a reference or neutral position, and is elastically returned to that neutral position. The lever (2) is articulated on a casing to control the position of at least one movable member (3) interacting with at least one pick-up (4) to deliver an electrical signal dependent upon the position of the lever. Two cams (7, 8) resiliently biased towar...

One disclosed embodiment of the improved digital to analog converters in accordance with the invention comprises means for producing a first series of pulses whose average value is representative of a first group of the bits of an applied digital signal; means for producing a second series of pulses whose average value exceeds that of the first series of pulses by a preselected fixed amount; means for filtering the first and second series of pulses; and means for alternately applying the filtere...

In an analogue indicating device (e.g. a clock) in which the relative positions of two relatively movable components (FIGS. 1-3; 26/28 and 12) is judged by the position of a reference marker (30/32) on one of the components (26/28) in relation to an adjacent scale (48) on the other component (12), the scale is constituted by a hologram (in 12) which when illuminated by a predetermined reference light (33) portrays a desired image of the scale (48) against which the reference marker (26/28) is se...

A multiplying digital-to-analogue converter of the kind in which digitally weighted currents proportional to a voltage applied to an analogue input are generated at respective outputs of a current mirror arrangement. These currents are switched to an output in accordance with the value of a digital signal applied to a digital input. In order for the converter to accommodate an analogue input voltage of either polarity relative to ground and generate corresponding output currents, a bias current ...

An analog to digital converter (ADC) includes a comparator, N.times.1-bit clocked shift register and a clock which is phase-locked to the input signal. The system according to the invention includes such an ADC, together with processing means. The ADC samples an input waveform and the processing means determines a correction waveform, converts the correction waveform to an analog signal, combines the correction waveform with the input waveform to control its envelope and outputs a combined wavef...

A method of calibrating a probe mounted on a machine in which the probe has a probe calibration matrix which relates the probe outputs in three orthogonal axes to the machine's X, Y and Z coordinate system. A datum ball mounted on the machine is bi-directionally scanned by the probe in one or more planes. For each plane, the mean direction of two approximate probe vectors in the plane is rotated about an axis orthogonal to that plane until the apparent material condition from the scan in each di...

Delivery vehicle formulations comprising active agents encapsulated within microparticles which include a succinimidyl moiety extending externally from a lipid molecule therein are capable of the cytoplasmic or nuclear cell delivery of intact encapsulated active agents.

The present invention provides a new method for manufacturing a prostaglandin analogue having one or more keto groups on the 5-membered ring and/or omega chain, which comprises the step of treating a corresponding hydroxyl group containing compound with a co-oxidizer under the presence of a tetramethylpyperidine-1-oxyl derivative to form the desired prostaglandin analogue. The method of the invention can be carried out easily under relatively mild conditions.

Novel somatostatin analogs exhibiting high activity in inhibiting insulin glucagon and growth hormone secretion are depicted by the formula: ##STR1## and pharmaceutically acceptable acid addition salts thereof.