A programmable event generator for generating digital timing waveforms in response to a triggering signal includes one programmable read-only memory for storing and outputting data words corresponding to the digital timing waveforms and next address words to address another of the data words, a storage register for temporarily storing and outputting any one of the data words and next address words, another mapping programmable read-only memory for storing and outputting starting address words to start the addressing of the one programmable read only memory, a multiplexer to select either a starting address word or a next address word to address the one programmable read-only memory, and a programmable control circuit, responsive to the triggering signal, for clocking the storage register at a programmed clock frequency.

Apparatus for generating digital timing waveforms

The size, power, and speed constraints in digital sinusoidal waveform generators using values stored in a read-only-memory are alleviated by storing the required values in two smaller read-only-memory devices containing a primary amplitude value and a secondary amplitude value, and a third read-only-memory containing corrective values, the total number of values in the three read-only-memory devices being reduced over the number in a single read-only-memory. The primary and secondary values are combined in accordance with disclosed trigonometric identities in response to a repetitive binary count, and the corrective values are added as determined by logic circuitry responding to the same binary count.

Digital sine conversion circuit for use in direct digital synthesizers

An apparatus for and method of enhancing the accuracy of analog-digital-analog conversions achieves improved accuracy by generating a dither signal which is combined with an input analog signal before the analog input signal is converted to digital form. The combined input analog/dither signal is then converted to digital. The digital signal is then processed or delayed in accordance with the desired function to be performed by the circuit. After digital processing, the digital values are converted back into analog form and the dither signal subsequently removed from the output signal. In addition, an apparatus for and method of enhancing the accuracy of analog-digital-analog conversions that does not utilize an explicit dither signal, utilizes linear interpolation techniques to achieve the effect of a pseudo dither signal. Similarly, time multiplexing techniques are also used to achieve the same effect. The principles of the present invention are applicable in systems that generate analog signals using consecutive digital samples. The resultant output signals from such systems exhibit improved accuracy, lower distortion and higher resolution. The present invention can also be utilized to maintain the original output resolution while requiring fewer bits to represent the digital samples.

System for enhancing the accuracy of analog-digital-analog conversions

Digital method and apparatus for generation of a digital data stream with the bit transitions shaped to reduce splatter, and minimize droop and overshoot in a radio communications system utilizing digital coded squelch. A codeword digital data stream, in digitized form, is shaped so that the bit transitions have the form of a portion of a sine waveform and then is applied to a D/A converter. A simple filter follows the D/A converter to attenuate sampling noise.

Method and apparatus for digital shaping of a digital data stream

An electronics housing comprises a housing basic body having a cavity, especially a single cavity. The housing basic body includes a side wall laterally bordering the cavity, an open end and a rear wall bounding the cavity on an end lying opposite the open end and remote therefrom. Also included is a housing lid releasably connected to the housing basic body on the open end and sealing the housing basic body; and an intermediate floor. The intermediate floor, in the case of the electronics housing of the invention, forms: a gap extending between an inner surface of the side wall of the housing basic body and a lateral surface of the intermediate floor facing the inner surface; and two housing chambers in the cavity of the housing basic body separated from one another by the intermediate floor. A first housing chamber is arranged on a first side of the intermediate floor facing the housing lid and a second housing chamber is arranged on a second side of the intermediate floor facing away from the housing lid. The intermediate floor is inserted into, and releasably affixed to, the housing basic body.

Electronics housing for an electronic device, and a device formed therewith

A function generator comprising an oscillator, an address counter, a storage matrix with 2 n addresses at m bits, and a digital to analog converter in which the storage matrix which is organized only according to the change which is maximally obtained between adjacent addresses of the function to be produced with integrating means coupled between the storage matrix and the output of the function generator for generating, for instance, nonlinear periodic processes or the nonlinear representation of electrical analog variables.

Function generator with storage matrix

The invention relates to a circuit arrangement for supplying power to electronically controllable field apparatuses, which are supplied via two-wire circuits, preferably actuating regulators and measurement converters, with actual information items which can be transmitted via the two-wire circuits by variation of a current parameter A voltage transmitting device (SU) which can be operated in the blocking oscillator mode contains in the secondary circuit a control amplifier device (OP) which transmits the voltage difference between a desired value and an actual value of a control device (RE) which is arranged in the primary region, with the aim of keeping the power of the field apparatuses (FG) constant over the modulation range (AB) of the actual information Such a circuit arrangement is used in switched-mode power supplies for actuators

Circuit for remote power supply of 2-wire field transmitters

Schaltungsanordnung zur energieversorgung von feldgeraeten

Funktionsgenerator mit speichermatrix

The invention relates to a power supply unit for obtaining a stabilised output voltage, having a transformer on the input side to whose secondary winding a bridge rectifier is connected. A charge capacitor is connected to the bridge rectifier via a controllable rectifier. The control input of the rectifier is connected to a phase-gating control device. In order to achieve a power supply unit which operates at high efficiency and with a low power loss, in one embodiment, the secondary winding (3) of the transformer (2) has a centre tap (4) which is connected to the charge capacitor (16) via a half-wave rectifier (37). In another embodiment of the power supply unit according to the invention, the controllable rectifier (40) is connected at that end of its switching path which faces away from the charge capacitor (16) via an auxiliary capacitor (42) to an AC voltage connection (43) of the bridge rectifier (7). A DC voltage output (12) of the bridge rectifier (7) is connected directly to the charge capacitor (16).

Lesche Wolfgang Dipl Ing

Papers

Function generator with storage matrix

Circuit for remote power supply of 2-wire field transmitters

Schaltungsanordnung zur energieversorgung von feldgeraeten

Funktionsgenerator mit speichermatrix

Power supply unit for obtaining a stabilised output voltage