Showing papers by "Nokia published in 1986"

Method of and a device for correcting signal distortion caused by a cable

Abstract: The present invention relates to a method for the correction of a signal distortion caused by a cable at the receiving end. To obtain adaptivity the method according to the invention comprises the steps of treating the received signal by an equalizer circuit, multiplying the output signal of the equalizer circuit by a correction coefficient and combining the signal obtained through the multiplication with the received signal to produce a corrected signal. The method further comprises detecting the corrected signal, taking a sample value of the output of the detector at a prescribed moment and holding the sample value up to the following sampling, comparing the sample value with a prescribed reference value, and determining the value of a new correction coefficient on the basis of the comparison in order to obtain a sample value equalling the reference value.

A method of and a device for applying a primary coating to an optical filament

Abstract: A method and a device for applying a primary coating to an optical filament. In order to make the distribution of the coating material even, the flow of the coating material to be introduced into the crucible (4) is divided in the crucible (4) into two flows opposite in direction and advancing in the peripheral direction of the crucible (4). The two flows are caused to flow in the axial direction substantially at the opposite sides of the crucible. The axial flows are caused to flow in the peripheral direction of the crucible and joined by means of an outer channel (17a, 17b) extending around the crucible (4) in the peripheral direction thereof. The flow is passed radially through throttle openings (19a, 19b) into an inner peripheral channel (20a, 20b) and further through a peripheral throttle slot (21a, 20b) into a conical channel (22a, 22b) along which it is led into a central chamber of the crucible, through which chamber the filament is drawn.

Method for adjusting the balancing impedance of a hybrid junction

Abstract: A method for adjusting the balancing impedance of a hybrid junction for maximization of the hybrid attenuation within the range between two operating frequencies, an upper and a lower one, when using a balancing impedance formed by two series-connected resistors (R 1 , R 2 ) and a capacitor (C 1 ) connected in parallel with one of said resistors. For the achievement of an optimal matching of the balancing impedance with the impedance of the line wo which the hybrid junction is connected to when all components of the balancing impedance are adjusted, the method according to the invention is effected in such a manner that (a) the first resistor (R 1 ) is adjusted for the maximization of the hybrid attenuation at the upper frequency, (b) the capacitor (C 1 ) is adjusted for the maximization of the hybrid attenuation at the upper frequency, (c) the second resistor (R 2 ) is adjusted for the maximization of the hybrid attenuation at the lower frequency, (d) the first resistor (R 1 ) is readjusted for the maximization of the hybrid attenuation at the lower frequency, (e) the second resistor (R 2 ) is readjusted for the maximization of the hybrid attenuation at the lower frequency, and (f) the capacitor (C 1 ) is readjusted for the maximization of the hybrid attenutation within the whole range of operating frequencies, with an eventual weighing of certain frequencies. (FIG. 8)

Method for generating a switching-signal in a broadcast or video receiver

Abstract: To increase the reliability of the detectability of identification data words (DW1) which are also transmitted by a transmitter during a transmission for identifying this transmission, a test circuit (14) is connected between the data separating circuit (6) and the data evaluating circuit (10) of a receiving device. In this test circuit, a separated identification data word is stored as reference data word (DW13) and compared with the subsequent identification data words (DW14...). The stored identification data word or one of the compared identification words is only forwarded to the data evaluating circuit when a predetermined proportion of coincidences is exceeded during the comparison. In the case of a coincidence with an identification data word (DW1p) stored in a desired-program store (41), the evaluating circuit forms from this a switching signal which is only switched off again when an anti-coincidence is detected during the comparison.

Flat picture-reproducing device

Abstract: In a flat, vacuum-enclosed picture-reproducing device having a phosphor-coated glass faceplate and a shallow tray-shaped rear housing in which a cathode consisting of a periodic array of oxide-coated heating wires is located in front of a counterelectrode, and which contains a control arrangement between the cathode and the faceplate, a perforated anode is present between the heating wires and the control arrangement, which consists of two layers of electrodes, and the counterelectrode has segments arranged perpendicular to the longitudinal dimension of the oxide-coated heating wires

Recording and reproducing apparatus with a device for indicating the running time of the remaining tape length

Abstract: In this apparatus, the indication of the running time of the remaining length of an information carrier (2) in tape form of a tape cassette (1) is made much more accurate by relating the tape length (L2) calculated from the supply of tape of the tape rolls (5, 6) in a first calculation operation of a calculating device (21) with the nominal tape length (LN) for the type of cassette (1) in a second calculation operation. The corrected tape thickness (dk) thereby determined is used instead of the nominal tape thickness in the calculating device (23) to determine the remaining tape length (L2). The accuracy of this time indication then corresponds to the accuracy of the actual length of tape in the cassette (1) in relation to the nominal tape length.

Metallizing transparent conductive paths

Abstract: To metallize transparent conductive paths of indium tin oxide (ITO) on substrates of display devices, a solderable metal layer is applied by electroless deposition. If the metal layer is adjacent a liquid crystal display device, the display device may be manufactured and tested prior to the electroless deposition, with only an edge of the substrate being dipped into the deposition bath. Prior to the deposition of the solderable metal layer, the indium tin oxide surface may be reduced and an adhesion improving layer of may also be deposited by above the indium tin surface and below the solderable metal layer. Integrated circuits can then be soldered to the metallized conductive paths.

Adjustment apparatus for video display device and method therefor

Abstract: An apparatus for the assembly and alignment of a video display device having a base plate and a holding device, the base plate including a plurality of movable adjusting studs projecting therefrom for engaging a plurality of alignment holes located in a plurality of structured plates of the video display device. The holding device includes a plurality of adjustable stops for engaging and aligning a spacing frame and a screen plate. Each alignment hole includes a diameter reducing metal ring to ensure precise alignment of the structured plates which are aligned and joined to the spacing frame and screen plate. The video display device is then removed from the apparatus.

A 2-/spl mu/m CMOS 8-MIPS digital processor with parallel processing capability

Abstract: A 2-/spl mu/m CMOS VLSI digital signal processor (DSP) family, the SP50, is described that is capable of eight million instructions per second and up to six concurrent operations in each instruction. Two DSPs, the PCB5010 and PCB5011, have been developed. Both are based on a common architecture which contains two 16-bit data buses, and a 16/spl times/16/spl rarr/40-bit multiplier accumulator and 16-bit ALU, both with multiprecision support in hardware. Also implemented are two static data RAMs (128/spl times/16 or 256/spl times/16), a data ROM (51/spl times/16), a 15-word three-port register file, three address computation units, and five serial and parallel I/O interfaces. The data path is controlled by an orthogonal instruction set, using 40-bit microcode words. The controller contains a five-level stack and an instruction repeat register, and can have either on-chip program memory (RAM: 32/spl times/40; ROM: 987/spl times/40) or off-chip program memory (up to 64K/spl times/40). Benchmarks show a two to sixfold improvement in overall performance over its predecessors.

Horizontal deflection circuit

Abstract: Bei der Horizontal-Ablenkschaltung wird der gemeinsame Fuspunkt (A) des Zweirichtungsschafters (D1, T1), des Hinlauf-(Cy) und des Rucklaufkondensators (C R ) uber einen Transistor (T2) mit dem Nullpotential verbunden. Der Transistor (T2) wird von der Regelspannung (U R ) fur eine konstante Bildbreite und Rasterkorrektur gesteuert. Dem Transistor (T2) kann ein Kondensator (C1) und eine vorgespannte Diode (D3) parallel geschaltet sein.

Method and a device for generating heat energy and oscillation energy

Abstract: The invention relates to a method of and a device for simultaneously generating heat energy and oscillation energy. In the method heat is generated by induction heating and oscillations are created by means of at least piezoelectric elements. Previously a resonance circuit formed by a series connection of an inductive component and a capacitive, piezoelectric component has been used for the generation of oscillations only. A disadvantage of this kind of circuit has been that the circuit is difficult to control on account of the narrow resonance region of the piezoelectric element. This advantage is avoided in the solution according to the invention in such manner that one and the same resonance circuit formed by a series connection of an inductive and capacitive element generates both heat energy and oscillation energy.

Process for applying a matrix

Abstract: 1. Process for applying a matrix of glass solder to the inner surface of the glass screen of a colour picture display device, characterized in that the matrix is applied to the glass screen (1) by means of silk screen printing and then subjected to a tempering process in order to crystallize the glass solder, where the glass solder is such that it will shrink during the said tempering process.

Centrifugal fan inlet vanes

Abstract: The stationary vanes at the inlet of the electric motor driven fan impeller 5 may be replaced by a different set of sheet metal vanes in order to change the fan output. The blade mountings may take various forms (Figs. 3 to 6).

Delivery pipe for a flowing medium and method for producing such a pipe

Abstract: A delivery pipe for a flowing medium, such as air, which pipe consists of a sheet metal strip (2) which is bent spirally in the form of a tube (1) and whose longitudinal edges are joined to form a spiral joint (3). The sheet metal strip has a groove (4) in the longitudinal direction of the strip, which groove forms a housing (6) running spirally around the tube for a heat transfer medium, such as liquid (7). The delivery pipe forms a heat exchanger of simple design, in which the sheet metal strip serves as a heat transfer surface between the medium flowing in the tube and the medium flowing in the housing. In the method for producing the delivery pipe, a flexible tube for a heat transfer medium is guided into the groove in the sheet metal strip before the sheet metal strip is bent and joined.

Picture tube heater supply circuit

Abstract: In a television receiver with a drive transformer for the horizontal output stage, the heater voltage for the picture tube is inductively obtained from the drive transformer.

Applications of satellite microwave radiometry in Finland

Abstract: Data from the Scanning Multichannel Microwave Radiometer (SMMR) onboard the Nimbus‐7 satellite were applied to (a) retrieval of the water equivalent of seasonal snow cover, (b) discrimination of forest and surface types, (c) determination of the near‐surface wind speed, and (d) determination of sea ice concentration. Several retrieval algorithms were tested in each case by using an extensive SMMR data set. The brightness temperature difference between 18 GHz and 37 GHz, vertical polarization, was observed to give the highest correlation coefficient with the manually measured snow water equivalent. The 10.7 GHz horizontally polarized SMMR channel has the best capability to distinguish between different forest and land‐cover categories. The same channel yields the near‐surface wind speed in the Baltic Sea (width about 200 km) with reasonably good accuracy. Previously developed wind speed algorithms have been applied only to areas far away from land. The use of the 18‐GHz horizontally polarized chan...

Screen printing process

Abstract: Beim Siebdrucken wird durch den Druck der Rakel (6) das Sieb (3) gedehnt. During screen printing, the screen (3) is expanded by the pressure of the doctor blade (6). Dadurch entsteht ein verzerrtes Druckbild (8) auf dem zu bedruckenden Material (4). This produces a distorted print image (8) on the printing material (4). Um diesen Fehler zu beseitigen, wird das Druckbild (7') im Sieb (3) derart vorverzerrt, das ein verzerrungsfreies Druckbild (8') entsteht. In order to eliminate this error, the print image (7 ') is in the screen (3) pre-distorted such that a distortion-free printed image (8') is formed.