Abstract: A handsfree or loudspeaking telephone circuit employing loudest speaker comparison for controlling the direction of transmission of speech signals. The circuit employs the speech network for the handset to provide gain and hybrid functions. The circuit contains logic for controlling the switching between handset operation, handsfree operation and call announcing operation.

Abstract: An optical receiver for responding to optical energy propagating in an optical fibre transmissions path (1) is detected by a reverse-biassed p-i-n diode (2) which is in series with a forward-biassed p-i-n diode (3). The junction between the two diodes is connected to the input of an amplifier (4), which feeds on auto-equalizer.The auto-equalizer includes another p-i-n diode (7) which is in series with the signal path, and is forward-biassed. Due to the associated components including resistors (9,10), the diode (7) passes the same average current as do the diodes (2,3) at the front end of the receiver. The overall effect of the third diode (7) is to provide the receiver with a substantial region in its characteristic whose frequency response is flat.

Abstract: In the manufacture of an InP/(In,Ga) (As,P) buried rib laser, the sides of the laser are profiled to have surfaces extending in {111} A planes down to the junction between the active and lower confining layers, and to have surfaces extending in other planes beneath this junction. In the subsequent epitaxial regrowth nucleation above this junction between the surfaces is discriminated against in favor of growth beneath this junction so that the regrowth up the sides of the rib is automatically temporarily arrested in the vicinity of this junction.

Abstract: The invention concerns a method and a device for lifting and lowering of a load. The load is provided with a short lifting chain which in its turn is connected to a guiding wire. A lifting hook connected to a lifting device is arranged to be guided along the guiding wire to the lifting chain.When the guiding wire is slacked the lifting chain will engage a slot in the lifting hook and the load can be lifted up.

Abstract: Circuit for controlling the operation of a handsfree or loudspeaking telephone instrument. The circuit includes an integrated circuit dual tone multifrequency (DTMF) generator. When a button of the generator is depressed, and the instrument is in its handsfree mode, power feed to the generator and the speech network is activated. The tone generation circuitry and speech network are thereby connected in parallel with the handsfree hybrid. When the DTMF button is released, power to the speech network is discontinued. Further, when the instrument is in the handsfree mode, and in the non-dialing condition, the confidence tone muting resistance is shunted so that no voice signal attenuation to the handsfree hybrid can occur. The switching is protected against surges both in the handsfree and hookswitch on and off hook conditions and is protected against leakage at the start of the DTMF output.

Abstract: A diaphragm pump pumping arrangement includes two diaphragm pumps which are arranged and operate in tandem. Each of the diaphragm pumps includes a housing and a movable wall that includes a flexible diaphragm and subdivides the interior of the respective pump housing into a pumping chamber and an actuating chamber. An air distributing control arrangement interposed between and connected to the pump housings includes a spool valve movable in a bore of an aluminum casing of the control arrangement between two end positions in which it alternatingly achieves the admission of the compressed air into one, and discharge of the air from the other, actuating chamber.

Abstract: A device for transporting lubricant to the mechanical sealds in a submersible machine includes a funnel shaped guide means arranged on a rotating shaft in an oil room. Oil will be sucked in at the small end of the guide means and flow out at its big end thus obtaining a transport of oil.

Abstract: A line switch for a digital telephone switching system utilizes distributed processing. The line switch comprises one or more switch modules. Each switch module is coupled to a central office switching system via one or more PCM lines which utilize common channel signaling. Each switch module comprises groups of line circuits, each line circuit being coupled to a subscriber line. Three separate distributed processor functions are provided in each line switch module. A first processor is utilized to communicate with the central office switching system and to coordinate the operations within the line switch module. A second processor is provided to control clock generation and rate conversion circuits. Each group of line circuits includes a third processor to control the operations of the line circuits and to gather information from the line circuit. A busing arrangement is provided within the line switch such that both control information and PCM voice data are routed throughout the line switch.

Abstract: A conference circuit for controlling one or more conferences within a digital time division telecommunications system. The conference circuit uses the generally known loudest speaker approach. Within the circuit, the address and loudness level of the loudest speaker for each conference in progress in the system during each time division frame is stored in memory. If the loudness level of a conference is not exceeded during a succession of frames, the level is allowed to decay by a percentage of the loudness indication stored at the end of that succession.

Abstract: Solid electrolytic capacitors are made in a batch process by etching a tantalum foil to form a number of rows of teeth, screen-printing tantalum powder ink onto the teeth, processing the sheet through sintering, anodizing and manganesing stages, sequentially encapsulating opposite edges of the rows of teeth in conductive epoxy and the "gap" with insulating epoxy and separating the individual capacitors from the rows.

Abstract: The electrodes of an electron-gun system of a color-picture tube are heated less as their distance from the cathode of the system increases. The electrode materials are so chosen with respect to their coefficients of expansion that no mechanical stresses are caused in the system structure despite the different temperatures.

Abstract: A line switch for a digital telephone switching system utilizes distributed processing. The line switch comprises one or more switch modules. Each switch module is coupled to a central office switching system via one or more PCM lines which utilize common channel signaling. Each switch module comprises groups of line circuits, each line circuit being coupled to a subscriber line. Three separate distributed processor functions are provided in each line switch module. A first processor is utilized to communicate with the central office switching system and to coordinate the operations within the line switch module. A second processor is provided to control clock generation and rate conversion circuits. Each group of line circuits includes a third processor to control the operations of the line circuits and to gather information from the line circuit. A busing arrangement is provided within the line switch such that both control information and PCM voice data are routed throughout the line switch.

Abstract: Height adjustment means for a cylindrical brush in a carpet sweeper with a U-shaped adjusting yoke which loads the cylindrical brush and is mounted in the housing by angled parts molded on the free ends of its members and is loaded at the summit part by a spring connected to an adjusting slide and riding up on ramp surfaces.

Abstract: An asynchronous digital TDM multiplexer-demultiplexer combination at one communication terminal is capable of multiplexing N asynchronous input data signals having a random mixture of different bit rates into a transmitted synchronous data stream having a predetermined fixed data format and a given bit rate greater than the sum of the rates of the different rates and to demultiplex N asynchronous output data signals having the same random mixture of the different bit rates from a received synchronous data stream having the data format and the given bit rate, where N is an integer greater than 1.

Abstract: A cooking appliance including a vat for containing food during cooking, having a lid for engaging the vat. The lid has a transparent portion forming a double window consisting exclusively of an upper window and a lower window congruently placed on top of each other and an air space sealed therebetween, such that the lower window is exposed to cooking vapors emanating from the vat and the upper window is exposed to the outside atmosphere. Improved visibility through the windows is obtained during cooking. The upper and lower windows comprise a single unitary closed shell surrounding the air space.

Abstract: The present invention discloses a data partitioning technique wherein the PCM speech transmission data field is utilized to contain both digitized speech (for example, from a telephone) and other data (for example, from a data terminal) in the same channel within a frame having a plurality of channels e.g. 32 channels, of information. This enables the speech and data to be combined in a common information field and simultaneously transmitted in the same channel, frame by frame, through a digital switching network to other system users. Also, in accordance with the present invention, system users can individually selectively access a data base system through the switching network, such that the same information can be broadcast from the database system to a plurality of system users, or such that different information can be accessed in the database system by a plurality of system users and simultaneously transmitted to different users in different channels.

Abstract: A gallium arsenide logic circuit which forms part of a silicon/gallium arsenide logic interface, is provided with a negative supply voltage from a silicon logic gate whose output is held in its LOW condition. This obviates the need to provide separate power supplies to the two different semiconductor types.

Abstract: A conference circuit in a digital telephone switching system includes a first code converter (CCL), which converts nonlinearly coded speech samples into linearly coded speech samples, and adder (ADD), which sums the converted speech samples originating from the participants in the conference, and a second code converter (LCC), which reconverts the sum values into nonlinearly coded speech samples. To avoid distortion without increasing the insertion loss, the speech samples of the individual participants are integrated with respect to time and compared in an evaluation circuit (EVC). The speech samples of the loudest participant are fed to the adder unattenuated, while those of all other participants are attenuated by a predetermined value before being added.

Abstract: There is described a processing register particularly adapted for use in digital processing systems to implement various digital functions as high order digital filters and other structures which presently require complicated integrated circuit arrangements.The processing register operates in five modes which are a shift register mode with multiple fixed delays, a shift register with multiple fixed delays and a time slot interchanger, a shift register mode with an alternating word pair interchanger, a programmable delay shift register and as a discrete fourier transform preprocessing module.The processing register is particularly adaptable to operate with a high speed multiplier to implement various digital processing functions. In order to accommodate mode operation the processing register contains a main shift register and a computation register which are under the control of a control register which register accepts a control input word having bits thereof indicative of a particular mode of operation.

Abstract: The arrangement to support a waveguide for transportation and handling and to support and protect a horizontal waveguide having a plurality of waveguide sections connected to each other in tandem suspended between two given spaced points comprises a plurality of shrouds each encasing a substantial length of a different one of the plurality of sections for support and protection thereof and a suspension means fastened to each end of each of the plurality of shrouds to suspend each of the plurality of waveguide sections from a cable extending between the two given spaced points.