Showing papers by "Nokia published in 1991"

Portable personal computer and mobile telephone device

Abstract: A portable computer telephone device comprising a portable personal computer and a mobile phone integrated into one and the same body structure said body having a display screen (3) and a keyboard member (2) for operating the computer and the mobile telephone. To improve the convenience of use of such an integrated device, the keyboard member (2) is arranged to be movable between open and closed positions with respect to the rest of the body structure (1) in such a way that in the open position the whole display screen (3) and at least the whole keyboard (4, 5) of the computer are accessible for operating the computer and in the closed position the keyboard member (2) covers a part of the display screen and leaves the buttons (6) of the mobile telephone part 3(a) of the display screen accessible for operating the mobile telephone.

Control of a card interface

Abstract: An apparatus for a device, particularly a telephone, using a memory card or a smart card inserted into the device including means for checking the identification data of the card and for activating the desired function of the apparatus after the verification of the data. The apparatus may include a memory unit in which the verified identification data read in from the card is recorded and used to compare subsequent identification data read in from a card. Alternatively, the apparatus may compare identification data read in from a card against verification data permanently stored in the apparatus. The apparatus also includes a timer and a comparison means which, on the basis of the output signal of the timer, compare the identification data of the card with either identification permanently stored in the apparatus or verified data previously read in from a card that is recorded in the memory unit, and thus terminate operation if the compared identification data are not identical.

Telephone apparatus with calling line identification

Abstract: A portable cellular telephone capable of recognizing a Calling Line Identification (CLI) signal. The telephone comprises a memory in which can be stored telephone numbers together with an associated operating instruction. For example the instruction may be for the telephone to respond with a "BUSY LINE" signal. When a call is received which includes a CLI signal the memory is searched to find a number corresponding to the CLI. If a match is found the normal operating sequence is interrupted to carry out the associated instruction. Hence the telephone can respond with a "BUSY LINE" signal for calls originating from selected telephone numbers, providing a call screening facility.

Method to determine transmission quality

Abstract: A method determines the transmission quality of a signal transmitted by a base station and received by a mobile station in a cellular digital radio telephone network. The mobile station determines the phase error of detected bits a the input of the channel decoder, calculates the average and variance of the phase error. The average and variance are used to calculate the S/N ratio. The S/N ratio information is transmitted to a base station which converts the S/N ratio to a value defining the BER estimate of the received signal.

Speed dialling method for a telephone unit

Abstract: The invention relates to a speed dialling method for a telephone unit, the dialled telephone number being stored according to the invention in a speed dialling register. The register is automatically sorted at each call, the telephone numbers being always in an order determined by their dialling frequency, with the most frequently dialled number at the top. By pressing step/skip buttons, the caller can easily scan such an adaptable register. The method is advantageously applied in mobile telephones, in particular car radiophones.

Maximum likelihood sequence detector

Abstract: A maximum likelihood detector using the Viterbi algorithm for estimating a sequence of data bits received over a communication channel. Depending on the constraint length (C), a plurality of different states is associated with the transmitted bits (e.g. 16 if C=4). The detector comprises various data sources relating respectively to state transition probabilities (branch metrics, previous partial path metrics) and observed values of the received bits. Means are provided for calculating the partial path metrics for each state using values from said data sources. The calculating means comprise a common adder/accumulator for performing repeated additive arithmetic operations and for storing the cumulative result thereof. Multiplexing means are also provided for selectively coupling the data sources in a predetermined order to the adder/accumulator to implement the partial path metric calculation. The architecture is compatible with VLSI techniques and enables the detector to be implemented using minimal semiconductor area. The detector may be used independently as an equaliser or a decoder but in a preferred embodiment both these functions re-use the same common hardware in series enabling both the equaliser and decoder to be implemented in a single integrated circuit (i.e. on one `chip`).

Battery charging apparatus in a portable electronic apparatus

Abstract: Apparatus for charging a NiCd battery in a portable electronic apparatus, specifically a radio telephone. A charger includes a trickle charge circuit and fast charge circuit which can be selectively enabled by a switch under the control of a signal V c generated by a voltage generator within the telephone. The charge mode may be selected automatically from within the telephone, e.g. depending on the charge state of the battery as detected by the charge state sensor. Additionally or alternatively the charge mode may be selected manually by depressing appropriate keys on the telephone. Preferably the charge mode is enabled by selecting an appropriate menu which is indicated visually on the display area of the telephone. This charging apparatus facilitates the adoption of a battery charging regime which optimizes battery life.

Method of producing optical waveguides by an ion exchange technique on a glass substrate

Abstract: The invention relates to a method of producing waveguides by an ion exchange technique on a glass substrate In order to be able to alleviate the tolerances allowed for the ion exchange technique, the waveguides are formed in the invention by diffusing ions which increase the refractive index away from a waveguide formed previously on the glass substrate and being wider than the optical waveguides to be produced, by using the ion exchange technique and a positive-type ion exchange mask

Telephone apparatus with calling line identification

Abstract: A portable cellular telephone (1) capable of recognizing a Calling Line Identifications (CLI) signal. The telephone comprises a memory (100) for storing telephone numbers and a counter for storing the respective number of calls received from telephone numbers stored in the memory. Preferably the counter comprises for each number stored in the memory (100) an associated portion (counter field) of the same memory. The telephone may be adapted to display, e.g. on LCD(5), the number of calls received from telephone numbers stored in the memory (100). Hence the user can review at a glance how many times a particular caller has made an incoming call.

Portable personal workstation

Abstract: The invention relates to a portable personal workstation, comprising a portable personal computer and a mobile phone integrated into one and the same body structure provided with a display screen (3) and a keyboard member (2) for operating the computer and the mobile telephone. To improve the convenience of use of such an integrated device, the keyboard member (2) is arranged to be movable between open and closed positions with respect to the rest of the body structure (1) in such a way that in the open position the whole display screen (3) and at least the whole keyboard (4, 5) of the computer are accessible for operating the computer and in the closed position the keyboard member (2) covers a part of the display screen and leaves at least some of the buttons (6) of the mobile telephone and a part of a display unit (3a) accessible for operating the mobile telephone.

A guided-wave Mach-Zehnder interferometer structure for wavelength multiplexing

Abstract: A guided-wave Mach-Zehnder interferometer structure, based on the use of a four-port hybrid optical coupler consisting of symmetric and nonsymmetric y junctions, is proposed for wavelength-division multiplexing application. This structure provides less sensitivity to fabrication parameters and optical polarization, and can also be applied to a wide-wavelength spacing operation. Interferometers for wavelength splitting in the 1.3- and 1.55- mu m windows were designed and fabricated into a glass substrate with a dry silver ion exchange process. The measured crosstalk was -30 dB with nonpolarized light. >

Battery charger for battery-operated equipment

Abstract: The invention relates to a battery charger for battery operated equipment such as a mobile telephone. The charger has a recess into which the equipment to be charged is placed for charging, and the recess has charging contacts through which current passes from the charger to the equipment to be charged. The first two opposite sides of the recess have guide fins, while the equipment to be charged has corresponding grooves. Different equipment models having different thicknesses, but a common width dimension, can be charged in the same battery charger.

Electromagnetic interference shielding construction in a radio telephone

Abstract: A frame construction for a radio telephone or the operating device of a radio telephone. The radio telephone comprises a frame on which printed circuit boards containing telephone electronics are secured on both sides of a substantially flat, electrically conductive frame plate. The frame plate together with ground foils of the printed circuit boards form EMI-shielding for the components located on the sides of the printed circuit boards which face the frame plate. The frame plate preferably has a raised edge to which a printed circuit board is secured. Radio telephone housing parts are located on the two sides of the frame plate to form the radio telephone housing.

Antenna selection switch for a diversity antenna

Abstract: The invention relates to a circuitry by means of which it is possible to switch to a mobile telephone that antenna out of two or more antennae which has the best signal, without substantial alterations in the mobile telephone itself. According to the invention, the antennae (A, B), the antenna selection switch (2) and the peripheral circuits (5, 6) connected to it constitute an integrated part which is separate from the actual mobile telephone (1) but can be coupled to it by means of an antenna cable (3), and the antenna cable (3) is coupled to the radio part of the mobile telephone (1) by mediation of a signal combining circuit (4) which transfers to the antenna cable (3) the supply voltage (V) and the antenna selection switch (2) control pulse, and transfers and selects the RF signal.

Adaptor device for coupling together optical waveguides produced by k-na ion exchange with optical waveguides produced by ag-na ion exchange

Abstract: The invention relates to an adaptor device for coupling together optical waveguides of different types and a process for the production of such an adaptor device. The adaptor device of the invention comprises an optical waveguide produced on a glass substrate by ion-exchange technique, in the fundamental mode of which waveguide the field distribution of light changes adiabatically in the longitudinal direction of the optical waveguide from the field distribution of the fundamental mode of the optical waveguide produced by K-Na ion exchange to the field distribution of the fundamental mode of the optical waveguide produced by Ag-Na ion exchange.

A device for scanning the menus of a telephone set

Abstract: The invention relates to a device for scanning the menus of a telephone set. The device essentially comprises according to the invention a finger actuated rolling means and elements (4, 5) which detect and transform the direction and speed of rotation of the finger actuated rolling means into control signals (N, S) which are conducted to a processor (6) controlling the menus. The device is advantageously used in cellular telephones.

Portable radio telephone which terminates an electronic keypad lock function upon sensing an incoming call

Abstract: A portable radio telephone has a keypad including a plurality of externally accessible keys. The keys can be disabled (i.e. the keypad can be locked) to prevent accidental actuation thereof by performing a predetermined order of keystrokes using two of the keys which ordinarily have an alternative function associated therewith. Thus, for example, depression of the # key followed by the ON/OFF key temporarily enables the keyboard lock. The lock can be disabled simply by repeating the same keystrokes.

Two piece radio telephone

Abstract: According to the invention, the power and weight of a radio telephone can be modified by connecting the same basic unit (1) a desired power unit (2 or 4). The signals received and transmitted between the units (1 and 2 or 4) pass apart from each other.

Input keyboard for an electronic appliance in entertainment electronics

Abstract: An input keyboard (1) contains a switching device (3) for pushbuttons (22) wherein the contact linings (11.1, 11.2) on a printed circuit board (10) are bridged by a countercontact (16) operated by the pushbutton (22). The countercontact (16) consists of a carbonized plastic foil (14) and an electrically conducting layer (17) on the side facing away from the contact linings. By virtue of this arrangement there comes into being a bridging resistance between the bridged conductor strips (12.1, 12.2) that depends on the operating pressure (P) applied to the pushbutton, this resistance being then used to cause a control circuit arrangement (6) to generate a control command (Bf) for setting a particular function and an adjustment command (Bw) for setting a particular value or adjustment rate.

A multi-function telephone apparatus

Abstract: A telephone apparatus (RPK) which is made up of a radio telephone part comprises a memory unit, a circuit for forming an outgoing call, a display (D) and a keyboard (K), and of a receiver part for receiving alphanumeric messages and for displaying them in the said display (D). The telephone apparatus (RPK) additionally includes a memory for storing an alphanumeric message and a circuit for displaying in the display (D) a telephone number, contained in this present message, and a circuit, connected to the keyboard (K), for transferring the telephone number in the display at each given time to the register for the forming of a telephone call.

Parameterized reachability trees for predicate/transition nets

Abstract: Elaboration of reachability analysis in the context of Predicate/Transition nets is studied For this purpose, parameters are introduced into the markings of Predicate/Transition nets These parameters represent any fixed individual values potentially appearing in the marking The formalism for dealing with parameterized markings is developed and the dynamics of Predicate/Transition nets are augmented to cope with parameters These are used to define parameterized reachability trees and an algorithm for generating them is presented They are shown to be significantly smaller than ordinary reachability trees and to contain the corresponding information: from one parameterized reachability tree several instances of ordinary reachability trees can be derived

Examination of two-step fabrication methods for single-mode fiber compatible ion-exchanged glass waveguides

Abstract: A computer model was used to study important two-step ion-exchange processes for fabrication of single-mode optical waveguides with fiberlike mode field distributions. As a first process step, a field-assisted method was calculated to have a better controllability than a diffusion method. As a second process step, field-assisted burial was found to optimize the coupling loss to fiber to 0.05 dB, but losses lower than 0.2 dB were calculated also for less complex diffusion process steps. On the basis of modeling, a solid state fabrication process was proposed, and the near field distributions of fabricated waveguides were measured to confirm the model.

Holder suitable for preventing inadvertent detachment of a telephone or its operating handpiece held by the holder

Abstract: A holder for a telephone or its operating handpiece (1), the holder comprising base plate (2) and side plates (3) extending upwardly from the edges of the base plate so that the telephone or its operating handpiece can be inserted between said side plates. Opposing sides of the side plates (3) are provided with elongated ridges (4) that are compatible with grooves along the sides of the telephone or its operating handpiece. The base plate (2) of the holder includes springs (6) which push the telephone or its operating handpiece (1) outwardly so that the ridges (4) align themselves with latching recesses (7) at the grooves (5).

Comb-line high-frequency band-pass filter having adjustment for varying coupling type between adjacent coaxial resonators

Abstract: A high-frequency bandpass filter, including several cylindrical conductor rods (3, 4) arranged in a line with predetermined spacings in a continuous space defined by an elongated housing (1) made of an electrically conductive material and closed on all sides, each conductor rod being attached and short-circuited at its first end to the housing (1) and spaced apart from the housing at its second end so that each conductor rod forms a coaxial resonator together with the housing. The second end of each conductor rod includes a portion (4) larger in diameter as compared with the remaining portion of the conductor rod, and the type of a coupling between two adjacent coaxial resonators is arranged to be set to be predominantly capacitive or predominantly inductive by adjusting the ratio of the distance between the first ends of the conductor rods (3, 4) of the coaxial resonators to a distance between the portions (4) with a larger diameter.

Combined broadcast radio receiver and radio telephone

Abstract: A radio apparatus for vehicle installation comprises a broadcast entertainment radio receiver (1) and a transceiver (2) of a mobile radio telephone combined in a unitary housing (3) designed to fit in the mounting recess ordinarily provided in the vehicle for accommodating a standard in-car audio entertainment unit. The receiver (1) and transceiver (2) may share a common audio amplifier (23) and external loudspeaker (10). Preferably the receiver (1) is automatically muted when the telephone is in use.

Circuitry arrangement for the elimination of spurious response in a radio telephone receiver

Abstract: The invention relates to a circuitry arrangement by means of which it is possible to suppress frequency components which cause spurious response in the intermediate frequency amplifier in a radio telephone receiver. The amplifier produces not only the input signal frequency but also harmonic frequencies of this frequency, in which case some harmonic frequency of the frequency component which causes spurious response is the same as the intermediate frequency. In the circuitry, between the signal path and the circuit ground, there is a circuit which is in series resonance at the frequency of the frequency component which causes spurious response, in which case a signal of this frequency is strongly attenuated, and the circuit is in parallel resonance at the intermediate frequency, in which case attenuation of a signal of this frequency is slight. It is possible to select an intermediate-frequency which is lower than the reception band multiplied by two, so that even strict requirements set on spurious response can be satisfied.

Circuit arrangement for connecting RF amplifier and supply voltage filter

Abstract: A circuit arrangement in which an RF amplifier circuit also acts as a filter for a second supply voltage which is produced from the supply voltage (Vcc out) of the amplifier. The high frequency RF amplifier circuit comprises a common emitter transistor with ancillary components, and the emitter is connected through a capacitor to the ground of the circuit. From the emitter of the transistor is obtained the second supply voltage (Vcc out) in which the filter circuit is said high frequency amplifier circuit wherein the transistor is used as an emitter follower. With the circuit arrangement of the invention, the separate high frequency amplifier circuit and the filtering circuit of the second supply voltage, both known of prior art, can be combined.

Radio test loop for a radio transceiver

Abstract: The invention relates to a device for looping a radio-frequency test signal transmitted by a transmitter section in a full duplex type transceiver to a receiver section for testing the transceiver. The device of the invention comprises mixing means (23, 28) for shifting the test signal from the transmitting frequency to the receiving frequency. Interference caused in the normal reception of the receiver by the test signal is prevented by switching means (31) positioned in a device output. The switching means separate the test signal from the input of the receiver between the test intervals. The device further comprises means (D1, 35, 36, 38) for supervising the operation of the switching means (31) by monitoring the signal level in the device output.

Silver-film ion-exchanged singlemode waveguides in Er doped phosphate glass

Abstract: The first fabrication of ion-exchanged waveguides in erbium doped phosphate glasses is reported. Singlemode channel waveguides are fabricated into a new erbium doped phosphate glass by a dry silver-film ion exchange technique. Mode profiles, transmission and fluorescence spectra of the fabricated waveguides are presented.