Abstract:
A cordless telephone has several mobile elements (MTn) allocated to a fixed element (FT). In order to establish a connection between the fixed element (FT) and one of the mobile elements (MTn), an incoming call (AR) is converted to an outgoing call. The exchange of the required communication data occurs exclusively over speech channels. An identification code with group or individual identification is emitted by the fixed element (FT) as an identification message (KMn) with a call message (RM). The call is signalled by the mobile parts (MTn) connected to one group. Call-indicator messages (RAM) are sent back one by one on a free channel. The fixed element (FT) monitors the channels until an established-connection message (VAM) is sent by a mobile element (MTn), a fork switch having been actuated. Said mobile part (MTn) thereby initiates the establishment of a connection. The fixed part (FT) can also call one mobile part (MTn) after another individually. Each mobile part (MTn) sends back on the same channel the call-indicator message (RAM) and, after the fork switch has been actuated, the established-connection message (VAM).
Abstract:
Programming a computer-connectable peripheral is simplified thanks to a process for selecting and programming the functions of such a peripheral. This process also allows the programming and selecting steps to become automatic.
Abstract:
It is known to make windings of inductive circuit elements for the assembly of printed circuit boards by bending wire elements into a U-shape, curving them over the core(s) and soldering their ends into conductive tracks with which they form complete windings. The wire elements are inserted individually in the printed circuit board. According to the invention, the wire elements (21) are laid and supported on a tunnel-shaped winding support (15) of essentially U-shaped cross-section. Embodiments which are advantageous for the electrical and mechanical properties are indicated in dependent claims.
Abstract:
In a receiver for digitally modulated signals in mobile communication systems, the reception signal can be represented as a complex vector. The signal undergoes homodyne or heterodyne incoherent conversion in a mixing stage with mixers (M) in which it is decomposed into a real component and an imaginary component. The signal components are filtered by low-pass filters (TP) and digitized by analog/digital converters (AD). The scanned values are converted into the magnitude and direction of the vector. The magnitude (B) controls the amplification of the preliminary amplifier (VV) and of the low-pass filters (TP), and the reception data are derived from the difference between two consecutive values of the direction (W).
Abstract:
An antenna for the transmitter and receiver of a portable radio appliance (cordless telephone, mobile telephone, pager, telepoint appliance, etc.) consists essentially of two sheet metal angles (2, 3) arranged side by side. One of the two elements is excited with high-frequency currents by means of a coaxial supply line (4). The second sheet metal angle (3) is excited through radiation coupling by the first sheet metal angle (2). The sheet metal angles (2, 3) are aligned in the same direction and the distance between them in the end region is considerably less than in the bent edge of the apex line. This results in high cross-currents and low impedance. The antenna can also be modified by supplying both sheet metal angles (2, 3), subdivision into two identical partial antennae or several sheet metal angles. The sheet metal angles can consist of metal foils placed on a plastic housing. An embodiment with wire angles is also possible.
Abstract:
In a compressed air lifting device for current collectors, which forms at the same time the only lifting and lowering spring arrangement, a rolling membrane cylinder (1) is used as driving element, the piston shaft (7) of which co-operates with the base shaft (15) of the current collector by means of at least one cable-like element (13, 20) and at least one cam plate (14, 18). This ensures above all that the base shaft (15) and the drive (1) are uncoupled, as far as all transverse vibrations to the piston shaft (7) are concerned. Advantageously, the rolling membrane cylinder (1) can pivot in the vertical direction. A moment-free stressing of the driving element is thus obtained by simple means.
Abstract:
Graphic objects that represent the course of a process are called by symbolic names by an application programme (AP) from a programming and displaying system (XM). Programming is carried out by means of an editor (XME). The graphic object that represents a measurement value is defined as a dynamic measurement object. When all required parameters are input, a measurement value table is coupled to the measurement object. The programme library of the programming and displaying system (XM) is linked to the application programme (AP) after translation. While the application programme (AP) is executed, a new measurement value is represented by a call by programming means of the programming and displaying system (XM). These means calculate the new dimensions, the new position, the new attributes, erase the measurement object at its previous location and draw the new one.
Abstract:
Described is a wireless telephone system in which fixed stations (FSn) are connected to an extention communications unit (PABX) via subscriber lines (TL). There are fewer fixed stations (FSn) than mobile sets (MT), and a connection can be established from every fixed station (FSn) to every mobile set (MT). The facilities "call re-routeing" and "call re-routeing follow-up" of the extension communications unit (PABX) permit the change by a mobile set (MT) to the radio coverage area (FBn) of another fixed station (FSn). In addition to this active management of subscribers by the extension communications unit (PABX), the individual identification codes of the mobile sets (MT) are also exchanged with the respective fixed stations (FSn) when no calls are taking place. Thus, in particular with wide-area extension communications units (PABX), a wireless telephone subscriber can be reached even if he moves out of the radio coverage area (FBn) of a fixed station (FSn) and into the radio coverage area (FBn) of another fixed station (FSn). The fixed stations (FSn) form, so to speak, a micro-cellular system.
Abstract:
According to the invention, a single bushing transformr (4) on the three-phase side is used in a current transformer arrangement for three-wire three-phase systems. Two of the total of three phase conductors are taken through it, either with the same number of turns and in mutually opposite directions or in the same direction and with a 2:1 difference in the number of turns or in the same direction and with a current flow halved in a phase conductor by a shunt (15). These arrangements prevent the occurrence of a zero resultant flux. The double secondary voltage generated by a double AW value occurring twice during each period is halved by an electronic correcting circuit. Its control commands are derived from suitable control pulses for the thyristors (21-26) of the three-phase bridge circuit (16). Two correcting circuits are given. The main advantage lies in the considerable saving in transformer material and hence also in space.
Abstract:
Circuit arrangement with adjustable amplifiers for microphones, headphones, loudspeakers, dial signal emitters or adjustable resistors for impedance adaptation, filtering functions, frequency-correcting devices or similar, used in telephone equipment and telephone installations or equipment connected during operation to telephone cables or similar, with adjustable amplifiers and passive components, which can be adjusted digitally in function of binary coded adjustment value data words. Said data words can be input into associated intermediate stores (6', 12', 13'...) supplied with current by the telephone cables (1, 2), where they can be stored in a volatile or non-volatile manner. All adjustment value intermediate stores (6', 12', 13'...) are connected to associate storage locations of a non-volatile central store (7) or designed as components of a central store in which the adjustable value data words provided for the individual intermediate stores (6', 12', 13'...) from an external data emitter can be input by means of a serial data bus (39). All adjustable amplifiers (19, 27, 37) and resistors (6, 12, 13...) including their associated intermediate stores (6', 12', 13'...), are incorporated, together with their current supply device (9) supplied via the telephone cable leads (1, 2) and either the central store (7) itself or the connections for an external central store with all connecting lines (18, 32) and switching devices (25, 31), in a single component manufactured by integrated circuit technology.