Abstract: A color picture tube comprising three electron-gun systems, in which on the shadow mask or a part connected thereto, phosphorescent marks are attached to the rear side thereof. These marks can be used for checking the exact position of the electron beams during adjustment. By suitably delaying the chrominance signals it is possible to improve the E-W convergence.

Abstract: A digital signal derived from an analog signal by means of an analog-to-digital converter clocked by a clock signal is fed to a first delay element and a 90.degree. phase shifter at the same time. The delayed digital signal is applied through a second delay element to one input of a first multiplier and directly to the other input of this multiplier. In similar fashion, the signal at the output of the 90.degree. phase shifter is applied directly to one input of a second multiplier and through a third delay element to the other input of this multiplier. The output signals of the multipliers are combined in an adder to provide the demodulated digital signal. In accordance with the invention, multiple multiplications and a signal mixture to form the Hilbert-transformed signal, which are necessary in the known prior art, can be avoided.

Abstract: In an integrated circuit of a digital peaking filter for the digital luminance channel of a color-television receiver a DC component of the amplitude characteristic independent of the peaking factor is achieved by cascading a first subnetwork and a second subnetwork. The first subnetwork includes a first delay element and an adder at the input end of the digital filter. The output of the adder is coupled to the inputs of second and third delay elements and to the minuend input of a first subtracter. The first subtracter has its output connected to the input of a fourth delay element and to the subtrahend input of a second subtracter. The output of the second subtracter is coupled through a multiplier to the subtrahend input of a third subtracter whose minuend input is connected to the output of the second delay element. The output of the third subtracter is the digital filter output. The peaking factor is applied to the multiplier.

Abstract: A circuit is described which holds the bootstrap node of a MOS push-pull end stage at a constant potential even if the end stage has to generate an output H-level. A diode/capacitor charge pump circuit supplies the required pulse current only fed to the node in case of the output H-level.

Abstract: An essentially digital circuit is disclosed in which a demodulated broadcast signal is digitized by an analog-to-digital converter and processed in three signal paths each including a tuned filter. The tuned filters have closely adjacent resonance frequencies, the same resonance curves, and the same resonance rises. The signals at the outputs of these three signal paths are so evaluated by means of four comparators and an RS flip-flop that the message tone signal appears at the Q output of the flip-flop only in the presence of the message tone frequency.

Abstract: An electron-gun system is described in which the segments of the particularly long electrode neighboring the other electrodes are made of a material having a temperature expansion coefficient differing from that of the other electrodes.

Abstract: Measuring apparatus for measuring the position of a light source inside a lighthouse as used in the manufacture of phosphor screens of color picture tubes comprises a base plate and two optical projection devices which are directed on to the light source, and which each contain at least two position diodes. An evaluating circuit connected thereto ascertains the position of the light source and the result is fed to a display device.

Abstract: A process for manufacturing a high voltage DMOS (Deep Diffusion Metal Oxide Semiconductor) transistor includes a first ion implantation and drive-in step to form a P-well in a N-substrate, and a second such step to form a N+ region in this well and a channel between this region and the substrate and under a polysilicon gate which is covered with a silicon nitride layer during the first step. By the presence of the latter layer pitting of the gate is prevented and no leakage paths are formed between source and drain.

Abstract: An electromechanical pulse generator includes a toothed disk driven by a rotating shaft to operate two pairs of contacts to generate one pulse output and one direction-of-rotation output. The pulse contacts and the direction-of-rotation contacts operate independently of each other. The toothed disk is rotatable and axially displaceable. The axial displacement is dependent on the direction of rotation via an inclined plane in the form of a screw thread which is rotatable by the rotary shaft. By axial displacement of the toothed disk, the direction of rotation of the shaft is detected, and by rotation of the toothed disk, the pulses are generated.

Abstract: A light-sensitive device is disclosed for separately detecting light of two different wavelength bands. Such a device can be used in optical data communication. The separate detection is accomplished by two separate pn junctions which are disposed on two different sides of a substrate and are optically in series. The pn junction lying in front in the light path responds to light of, e.g., 850 nm, but not to light in the range from 950 nm to 1,650 nm. The substrate acts as a filter and passes the light of longer wavelength while blocking the 850-nm light, so that the second pn junction is only reached by light in the range from 950 nm to 1,650 nm.

Abstract: A windshield wiper unit with a wiper arm of telescopic construction which has a housing driven to and fro round an axis of rotation by a driving motor and a slide movable in relation to the housing, this slide being displaceable by a crank assembly is so designed that the various bearings are subjected to little load and so that compact construction is possible. This is achieved by having the connecting rod belonging to the crank assembly above or below the slide and linked to the slide between the two bearings for it and by having the distance between the two bearings at least as great as the stroke of the slide.

Abstract: In addition to the correction magnets commonly used in the electron-gun system of a color-picture tube for color purity and dynamic convergence, one or more additional correction magnets are fixed in or on the electron-gun system. During final adjustment of the color-picture tube, the usual and additional correction magnets are adjusted in turn using the same magnetizer.

Abstract: A sensor system is adapted for use in automatically adjusting the deflection system of a television picture tube so as to compensate for pincushion distortion including a rectangular frame disposed along the edge of the screen within the sweep range of the electron beam. The frame comprises a striplike, regular arrangement of alternately transparent and opaque segments. In a first embodiment, a conductive path having an external terminal and shielded from the cathode of the television picture tube at regular intervals by equally large metal areas runs along the edge of the screen. This arrangement is on the inside of the screen. In a second embodiment, an optical-fiber array with at least one light-sensitive detector mounted at at least one corner is used.

Abstract: A digital phase detector for processing digital signals consisting of words containing more than 10 bits eliminates the need for a large read-only memory for arc tan values and requires only individual read-only memories for the arc tan values 2.sup.-r, where r=1 . . . n. n-1 like stages are provided each of which consists of an adder, a subtracter, two constant multipliers for the factor 2.sup.-r, and three changeover switches. The nth stage contains a constant multiplier for 2.sup.-n, a subtracter, and a changeover switch. The outputs of one of the changeover switches in each of the like stages and of the changeover switch in the nth stage are coupled to the inputs of a multiple-input adder whose output provides the phase detected digital signal. In a second variant of the solution, only j stages contain the above-mentioned subcircuits, while the other stages are simplified to form cells each of which contains only one constant multiplier, a subtracter with associated changeover switch, and an inverter.

Abstract: To implement CMOS EXORs or EXNORs, four transistors are used which have one end of their channels tied to the gate output. The first and fourth transistors are one conductivity type, and the second and third transistors are of the other conductivity type. One of the inputs is split up into two sub-inputs to which one of the digital signals has to be applied in uninverted form and in inverted form, respectively. The other end of the channel of the fourth transistor is connected to the first sub-input in the case of the EXOR and to the second sub-input in the case of the EXNOR. The reverse is true for the channel of the third transistor, while the channels of the first and second transistors are connected to the second input. The latter is also connected to the gates of the third and fourth transistors. The gate of the first transistor is connected to the channel of the fourth transistor, while the gate of the second transistor is connected to the channel of the third transistor.

Abstract: Digitized audio-frequency signals are processed in a signal processor (SP) together with digital control signals and pass through a wireless infrared transmission link (I) whose receiver (E) and a following power amplifier (V) are incorporated in a loudspeaker box (B). The audio-frequency signals are coded in a protected code and are fed first to a code-conversion/error-correction processor (CP), then to the signal processor (SP), and then to an RF modulator (M) which drives the transmitter (S) of the transmission link (I).In a modification, the code-conversion/error-correction processor (CP) and the signal processor (SP) are disposed within the loudspeaker box (B'), so that errors arising on the transmission link (I) can be compensated for.

Abstract: In order to be able to use the combination of a commercially available type of television receiver (1) with a commercially available type of video tape recorder (3) or video disk recorder, additionally also as a home computer, a data and address bus (32) is provided for additionally in the television receiver, to which there are connected a processor module 30, a computer module (33), a data storage (34), and a character generator (35). A computer control circuit (41) switches the equipment combination into a computer operational state in which the deflection circuit (40) and the video signal amplifier circuit (6) for the picture tube (7), are connected to the output of the character generator, and the recording and reproducing lines (21) of the video tape or video disk recorder are connected via a code converter (42) to the data and address bus (32).

Abstract: In this IC set, the dark currents and the white levels of the three electron guns, the leakage currents of the cathodes, and a light-detector current are measured during four successive vertical blanking intervals. The cathode leakage currents and the dark currents are measured in the first half of the vertical blanking interval, and the light-detector current and the white-level currents are measured at the end of this interval. From these measured data and alignment data stored in a reprogrammable memory (ps), a microprocessor (mp) contained together with the memory (ps) in an integrated circuit (ic2) derives operating data for the picture tube (b) as well as further data.

Abstract: A delay circuit provides adjustable delay in constant increments. In order to achieve adjustable but constant delay times of a chain of inverter pairs, each pair is completed by a capacitor, a third inverter, and a transfer transistor the gate of which is fed by a voltage controlling the pair delay time. This voltage is generated by a control circuit measuring the actual delay time of the chain with respect to the period of a constant clock signal.

Abstract: The NOR decoders of a static random access memory are divided into two or more sets only one of which is powered up at any one time. This significantly reduces the power dissipation of the memory and allows the device to be operational under high access speed conditions. In a preferred arrangement each decoding node is clamped to a voltage level significantly lower than the circuit supply voltage. This provides an increase in operating speed by reducing the deselection time.