An error correction circuit for an analog-to-digital converter is shown wherein and analog-to-digital converter includes a counter-and-storage circuit that stores an analog input signal in the form of a preliminary digital signal. An error sample-and-hold circuit receives an error signal, including switching and offset errors, generated by the analog-to-digital converter and stores that signal while the switching and offset errors are removed therefrom. The resulting signal is then applied to a ...

A power supply including a source of AC power, a filter including inductive elements, and rectifying circuitry. Where the AC source comprises a sinewave source, the filter includes inductive and capacitive elements; and where the AC source comprises a square wave source, the filter includes only inductive elements.

A family of frequency to amplitude converters is disclosed which convert an incoming signal of a complex waveform and unknown frequency into an output signal corresponding in amplitude to the unknown frequency of the input signal thereby permitting accurate determination of the frequency of the complex input signal waveform.

A digital-to-analog converter utilizing a set of high-speed current switches each comprising a buffer transistor and a switching transistor interconnected with a common resistor in such a fashion that the buffer transistor in the normal "off" state supplies the common resistor with a current of predetermined magnitude to bias the switching transistor to cut-off; a control pulse coupled through an input diode cuts off the buffer transistor, the bias at the switching transistor is thereby eliminat...

A television standards converter for converting an input digital video signal from one television standard to another, comprises a high-pass filter (36) for filtering the input video signal horizontally and vertically, a pluraity of parallel processing channels comprising respective circuits (43 to 58) for determining pixel by pixel of the high-pass filtered video signal the correlation magnitudes for a range of horizontal and vertical pixel offsets, low-pass filters (59) for filtering the resul...

Apparatus and method for monitoring a condition of a textile machine including switch means mounted adjacent the machine having an open and closed position and means mounted on the textile machine for causing the switch means to alternately change status while the machine is in operation, the frequency of the status changes being a function of the condition being monitored. In the specific embodiment disclosed, a reed switch is mounted adjacent one of the dials on a hank counter which carries a ...

The invention relates to a tilting drive for converters comprising a gear wheel fixed to a converter tilting trunnion and a pinion carrier suspended on said tilting trunnion to swing in pendulum fashion and supporting at least one driving pinion, said pinion carrier being resiliently supported in relation to a foundation by a torque support comprising a linkage rod, a lever producing a torsional moment and a torsional rod, wherein the improvement resides in at least one of the following features...

A frequency converter according to this invention comprises a transformer having three wye connected three-phase secondaries connected to a delta configuration of controlled rectifier bridges, and means for firing the rectifiers so as to obtain an adjustable frequency output from the bridges. Each bridge has three parallel legs with at least two rectifiers per leg connected in series anode to cathode. The three output terminals of each transformer secondary are connected to the three legs respec...

In known dual ramp digital voltmeters the ramp up (as the input voltage is integrated) is followed immediately by the ramp down (as the opposing reference voltage is integrated). In this invention there is a small but deliberate delay between ramp up and ramp down which allows conditions to settle and provides an interval during which a reliable polarity determination can be effected.

Control means for an AC/AC frequency converter for induction heating employing solid state switching devices of the type shown in application for U.S. Letters Patent Ser. No. 737,639 filed June 17, 1968, (U.S. Pat. No. 3,546,562, granted Dec. 8, 1970), which operates essentially at the resonant frequency of the tuned load circuit, comprising circuits individually sensing the high frequency output voltage and current, the low frequency input voltage and combining said individual signals to automa...