Showing papers by "Alcatel-Lucent published in 1968"

Reflection type contactless touch switch having housing with light entrance and exit apertures opposite and facing

Abstract: Contactless touch switch in which an electric pulse is produced by light impinging on a photosensitive cell due to reflection of a beam of light. According to the invention the touch switch is constructed in such a manner that the beam of light normally emerges through an aperture in the touch switch housing, which is closed on all sides, and that the photosensitive cell, which is protected by screening, can receive substantially only those rays which are produced by reflection of the beam of light at an object, preferably a finger covering said aperture.

Hospital communication system having provision for connecting patient with nearest nurse-occupied station

Abstract: A communication system adapted to find the closest available station to the calling station. The attempt to reach an available station out of a plurality of stations is accomplished by test means which test the availability of the plurality of stations so that they are selected in an order depending on the identity of the calling stations.

Automatic telecommunication switching system and information handling system

Abstract: The present system includes two programmed processors and a plurality of identical peripheral modules each comprising a switching network part and two network control circuits which are each permanently connected to a respective one of the two processors by transmission means. Both processors operate on a load-sharing basis and continuously inform one another about the characteristic phases of the operations performed in order that a correctly operating processor should be able to takeover the already started operations of a faulty processor. This continuous exchange of information is performed during interprocessor interrupt programs which are programs of highest priority. In decreasing order of priority, the other programs that are used include a clock interrupt program, an asynchronous switching interrupt program and a base level program. The system also includes means to detect a faulty processor by traffic comparison.

Mobile radio telephone and paging system

Abstract: A public mobile radio communication system is provided for a plurality of mobile radio stations in which each mobile station includes either paging devices, or a telephone, or both. The system employs a service radio channel for sending selective calls from a fixed station to terminate at all the mobile stations. A second radio channel is marked by the fixed station for signaling from the mobile stations having telephones and the capacity to originate calls. Communication between the fixed station and a mobile telephone will employ either the second marked channel or another differently marked free channel.

Charged‐Particle Emission upon Ruby Laser Irradiation of Transparent Dielectric Materials

Abstract: Positive and negative charged particle currents induced in vacuo by high‐power laser irradiation of transparent dielectric materials below the threshold for physical damage have been investigated. Soft glass, Pyrex, fused quartz, Supracil quartz, CaF2, LiF, and sapphire all show similar behavior. Currents as large as 1010 charged particles per pulse are obtained using ruby laser radiation with normal mode power levels of about 200 kW. For negative particle currents, two distinct signals have been time resolved using Q‐switched pulses. The emission can be correlated qualitatively with that from laser irradiated metal surfaces. A phenomenological model is presented to account for the observed emission pulses. For the dielectric materials, currents are ascribed to laser heating of surface contaminants with subsequent production of high‐energy photons and thermionic emission of electrons and ions. The emission of photons, electrons, and ions can be reduced, but not completely eliminated, by careful precleanin...

Circuit to control the duration of pulses

Abstract: The duration of pulses may be controlled to have a given constant width, or a variable width to convey intelligence by the circuit of this invention. A semiconductor device receives a pulse input whose width is to be maintained constant or varied. A bias voltage, constant or variable, is coupled to the control electrode of said device to adjust the storage time thereof. The output of said device and the pulse input are coupled to an OR gate to produce either said constant or variable width pulse output. Negative feedback to the control electrode may be employed to compensate the pulse output for temperature variations.

Dichroïsme circulaire des centres R dans KCl

Abstract: Le dichroisme circulaire a ete mesure dans la bande R2 et la raie sans phonon des centres R dans KC1. Il a ete analyse par la methode des moments. Le deplacement du centre de gravite de la raie observee en lumiere polarisee circulairement lorsqu'on applique un champ magnetique a permis de mesurer le facteur de Lande et la constante d'interaction spin-orbite dans le niveau fondamental. Le dichroisme circulaire observe dans la bande R2 a permis la determination de la symetrie des modes de vibration donnant lieu aux deux premiers pics de la structure de la bande R 2 ainsi que le facteur de reduction du moment cinetique resultant de l'effet Jahn-Teller dynamique. Les coefficients de couplage des centres avec les modes de vibration symetriques et non symetriques ont ete estimes.

Great-diameter valve for ultrahigh vacuum

Abstract: The valve includes a valve member of great diameter provided with an elastomer seal and borne by a carriage allowing its translational motion during the valve-opening or closing movements. An insulating chamber provided within the valve case houses the valve member when the valve is open. A metal bellows is caused by pneumatic jacks to engage the valve member, when the valve is closed. In the open condition, said chamber ensures thermal insulation of the valve member and protects the seal thereof during heating at high temperature of the ultrahigh vacuum vessel components.

Pulse generator with time delay

Abstract: A multistage transistor time-delay pulse generator in which the delay between stages conventionally produced by R-C networks is achieved by using the storage time phenomenon of transistors, and the capacitors are eliminated. In one embodiment a chain of three transistors stages are coupled solely by resistors with the last transistor feeding back to the base of the first transistor. Other embodiments use diodes or transistors instead of the resistors and in one such other embodiment instead of single transistors between successive stages a pair of transistors in tandem is employed.

Mobile radiotelephone communication system

Abstract: A mobile telephone system is provided with radio telephone and paging equipment which is serviced over a group of channels allotted to a fixed radio telephone station. The latter provides automatic communication between the customers of a public telephone ground network and mobile sets. A free channel is marked by a tone, to be taken in a telephone call. Paging call numbers directed to paging mobile sets are transmitted from the station if the required channel is free. If the channel is not free, these paging calls alternate with the radiotelephone communications. In order to more effectively use the equipment, the called paging numbers are stored and then transmitted in limited trains of numbers.

Marginal switching arrangement

Abstract: The arrangement provides two long-tail transistor pairs with paralleled collector outputs and a detecting device branched across the above pair of outputs. The input signal is compared with the upper and lower levels of the selected range by means of the first and a second transistor pair and gives rise to equal potentials at both ends of the detecting device except when this input signal is above or below the range.

Scanning arrangement in a telephone switching system

Abstract: In a switching system, a scanning arrangement is provided to interrogate a plurality of links interconnecting a plurality of switching stages of the system for determining their busy and idle conditions. The scanning arrangement includes a plurality of diode-gating means responsive to the interrogating signals for applying the busy and idle status signals of the links to the register means of the system wherein each of said diode-gating means is coupled to the scanning means and the register means and to a corresponding one of the plurality of links. Each of the diode gating means includes a DC potential source, a junction, first resistor coupling the DC potential source to the junction, second resistor coupling the junction to the corresponding link, a capacitor coupling the scanning means to the junction, and a diode being coupled to the junction and being poled to change from a nonconductive to conductive state in response to the change in the condition of the corresponding link from an idle to busy condition. The system is also provided with a plurality of biasing means, each means establishing a predetermined common bias potential level at the output of a selected number of the plurality of the diode-gating means.

Multiple frequency synthesizer providing a plurality of selected frequencies in a spectrum of frequencies

Abstract: 1,160,848. Frequency generators; automatic frequency control. C.I.T. -COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS. 17 June, 1968 [16 June, 1967], No. 28648/68. Headings H3A and H3F. A frequency synthesizer produces a plurality of different synchronized output frequencies from respective set frequency units 20-60 each of which is capable of being set by means of a general control unit 20 to a desired frequency set up in a frequency selector unit 10 which has controls 12 to select a desired frequency and switching devices 15 for choosing the unit whose output frequency is to be synchronized with the desired frequency. The general control unit 20 provides a spectrum of stabilized frequencies with any of which the chosen set frequency unit may be synchronized, a generator providing an exploratory control voltage to a variable oscillator in the chosen set frequency unit, and a modulating and filtering member connected to compare output frequency of the variable oscillator in the chosen set frequency unit with the frequency spectrum and providing output pulses for each frequency coincidence above a predetermined threshold frequency. The general control unit 20 also contains a pulse counter adapted to be preset to a number indicative of the desired frequency and to provide a switching signal changing the variable oscillator from exploratory control to a synchronized control when the number of coincidence pulses received corresponds to said preset number. Each of the set frequency units 30-60 contains, in addition to the variable frequency oscillator, a monitoring and filtering circuit in which the variable oscillator output frequency is modulated with the frequency spectrum received from the general control unit 20 to provide a first frequency, a phase discriminator comparing this frequency with a second stabilized frequency received from the general control unit 20 to provide a synchronizing control, and switching circuitry responsive to the switching signal from the counter in the general control unit 20 to change the variable oscillator from exploratory control to synchronized control when its output frequency coincides with the desired frequency set up in the frequency selector unit 10. The frequency selector unit may be remote from the other units and may comprise an automatic arrangement, the frequencies desired being set up in advance, e.g. on perforated tape. The manual control unit shown contains, in addition to the frequency selector knobs 12, associated visual indicators 13 indicating the frequency set up, and in addition to the switching devices 15 for choosing the unit to be controlled, visual indicators 14 which light up when the frequency indicated at 13 is obtained synchronized from the relevant set frequency unit. Subsidiary range knobs 16 each cover a section of the synthesized range of frequencies, switching into operation four corresponding oscillators in each of the set frequency units. The connection of the selected set frequency unit to the frequency selector unit is effected by an engagement control knob 11 1 , and a controller 17 enables resynchronization of one of the output frequencies to take place automatically if it has been lost accidentally; it consists of a memory in which is stored each of the desired frequencies, coupled to a logic circuit which automatically operates the controls of the frequency selector unit to repeat the exploratory and synchronizing processes. In another embodiment (Fig. 4, not shown) the frequency selector unit includes monostable multivibrators individually selectable to synchronize respective set frequency units with desired frequencies set up in succession in the frequency selector unit, the general control unit having groups of AND gates equal in number to the number of set frequency units associated with the synthesizer, the variable oscillators of these set frequency units being selectively connectable through one of the groups of AND gates to the exploratory control voltage generator by the monostable multivibrators.

Directory number-equipment number and equipment number-directory number translator arrangement

Abstract: The present invention relates to a two-way translator arrangement for an automatic switching system including n groups of substation lines, each of the n group including a plurality of substation lines, certain ones of the plurality of lines being normal lines having a normal class-of-service and whose directory and equipment numbers are associated by a predetermined systematic relationship and special lines whose directory and equipment numbers are not so associated and/or which have a special class-of-service. The special lines are further divided into first level special lines for which the group number portion of their directory and equipment numbers are associated by a given one-to-one relationship and second level special lines for which the group number portion of their directory and equipment numbers are not so associated. The arrangement includes a detection means addressable by one of the directory and equipment numbers to detect the presence of special lines and produces a control signal in response thereto, a first translation stage including n substages each assigned to the first level special lines of a different one of the n groups and a second translation stage assigned in common to the second level special lines of all the n groups. When the control signal is produced, the one of the n substages associated with that one of the n groups containing the addressed special line is activated to carry out the required translation and the second translator stage detects the failure of the one of the n substages to carry out the required translation because the addressed special line is not one of the first level special lines and to activate the second translator stage to carry out the required translation. In addition, an auxiliary translator stage is coupled to both the first and second translator stages to cooperate therewith in case the addressed line is of a complex class and/or has a transfer of call facility.

Equipment for teaching mathematics

Abstract: EQUIPMENT FOR TEACHING MATHEMATICS INCLUDING MEANS WITH A PLURALITY OF AREAS AND A PLURALITY OF ELEMENTS WHICH REPRESENT EACH A MAGNITUDE AND ARE EACH SELECTIVELY POSITIONABLE ON SAID AREAS, SAID PLURALITY OF AREAS REPRESENT POWERS OF A SAME RADIX R AND SAID ELEMENTS EACH REPRESENT ONE OF THE VALUES FROM 1 TO R-1.

Pawl and ratchet mechanism

Abstract: A STEPPING MECHANISM IS PROVIDED USING A ROTATABLE STAR WHEEL FORMED OF PLASTIC AND A FORK-SHAPED PAWL. THE ARMS OF THE PAWL ARE TERMINATED IN TWO SURFACES, ONE OF WHICH HAS ABOUT HALF THE AREA OF A TOTH ON THE STAR WHEEL. THE RELATIVELY SMALL AREA ON THE PAWL IS CHOSEN SO THAT IT CANNOT CAUSE THE STAR WHEEL TO ROTATE IN THE BACKWARD DIRECTION EVEN WHEN IT BECOMES STICKY DUE TO THE PRESENCE OF GREASE ON IT.