Abstract: An image rejection circuit (10) receives an incoming signal (RF.sub.IN) and an oscillator signal (V.sub.OSC) generated by a local oscillator (26). Output signals (I.sub.OUT20 and I.sub.OUT40) are generated by first mixer circuits (14 and 34) by multiplying the incoming signal (RF.sub.IN) with the oscillator signal (V.sub.OSC) Second mixer circuits (24 and 44) multiply the output signals (I.sub.OUT20 and I.sub.OUT40) with a counter signal that is a divided oscillator signal (V.sub.OSC). A summing circuit (46) sums the signals generated by the second mixer circuits (24 and 44) and provides a signal (IF.sub.OUT). Phase shift circuits (22, 29, 31, and 42) provide a shifted oscillator signal (V.sub.OSC) and a shifted counter signal to the first and second mixer circuits (14, 24, 34, and 44) that cause cancellation of unwanted image signals in the signal (IF.sub.OUT).

Abstract: A cordless telephone apparatus and method of use thereof with a telephone system providing a ring cadence as a series of alternating ring and silence periods over a telephone line. The cordless telephone comprises a handset that is configured and arranged to operate in a low power mode during periods of inactivity on the telephone line and, in response to receiving a least one ring message, in a normal power mode in which the battery-powered handset acknowledges receipt of the ring message. The cordless telephone further comprises a base unit is configured and arranged to respond to a ring signal received over the telephone line by sending the ring message to the battery-powered handset through the end of each ring period, and for a portion of the subsequent silent period, until the handset reverts to the normal power mode and acknowledges receipt of the ring message.

Abstract: In a portable radio apparatus, a displaying unit displays predetermined information in response to an ON signal and stops the display of the information in response to an OFF signal. An operation unit with buttons including specified buttons generates a start signal in response to operation of any of the specified buttons by a user. A detecting section generates a display request in response to the start signal. A control section issues the ON signal to the displaying unit in response to the display request from the detecting section and the OFF signal to the displaying unit such that the predetermined information is displayed on the displaying unit for a time period equal to or longer than a predetermined time period.

Abstract: Method and apparatus for sharing a SIM card between two masters. The invention may be embodied in so-called multi-mode radiotelephones that use SIM cards to store and access information. The multi-mode radiotelephone includes at least two master components and a single SIM card. The method and apparatus synchronizes and coordinates communications from either master component directly to the SIM card, thereby allowing a single SIM card to directly service two master components.

Abstract: An RF mixer utilizing frequency and bias compensation for improved performance characteristics. The RF mixer receives bias signals that are dependent on V.sub.CC levels to internally balance the local oscillation received and mix the perfectly bias balanced internally generated oscillation signal with the RF input.

Abstract: A method for completing a telephone call originating from a calling party to a called party. The method determines the time zone at a first cell location associated with the originating calling party. It also determines the time zone at a second location associated with the called party. A comparison is made between the time zone associated with the calling party with the time zone associated with the called party. An announcement associated with the time of day is made to the calling party if the time zone associated with the calling party is not the same as the time zone associated with the called party. The system provides the calling party with a menu of options for completing a telephone call to the called party when the calling party receives either a busy signal, a ring no answer response, a message that said called party's telephone has been changed or a message that said called party's telephone is out of service.

Abstract: A method is provided for verifying personalization for a mobile radio terminal having a detachable Subscriber identity module (SIM) card. The method includes the step of storing verification mode setting information in the terminal pertaining to verification modes that include a normal and a forced verification mode. The information is then accessed to determine whether the mode setting information pertains to the forced verification mode, when a predefined condition exists. When the mode setting information is set to the forced verification mode, it is determined whether a SIM lock code stored in the mobile radio terminal is identical to a SIM lock code stored in the SIM card. When the SIM lock codes are not identical, it is determined whether a password input by a user is identical to a password stored in the terminal. Additionally, the method includes the step of blocking the terminal when the passwords are not identical.

Abstract: The present invention provides a bi-directional (and/or uni-directional) multiplexing messaging gateway for wireless devices, such as for devices using the Global System for Mobile Communication (GSM) wireless digital standard, or any other suitable protocols. Electronic messages may be transmitted over a wireless connection to, or to and from, a mobile phone, and the present invention maintains and facilitates all necessary housekeeping functions. For example, electronic messages addressed to a mobile phone may be received by the gateway of the present invention from the Internet, a LAN, or any other source, and routed to the appropriate mobile phone. Such electronic messages may be originated manually or may be automatically generated by specific computer applications, such as a scheduling program operating on a LAN.

Abstract: In a mobile telecommunications switching network, mobile stations may be used in static applications such as a telemetry application. The telecommunications switching network can reduce and/or eliminate subscriber numbers allocated to mobile stations that are used in static applications by taking advantage of the fact that the location of such mobile stations is always known and does not change. Accordingly, the mobile stations can be identified and located within the switching network by a unique combination of paging area identification number (e.g., a mobile switching center identification code) and international mobile subscriber identity, rather than by a unique mobile subscriber number (MSN) or mobile station ISDN (MSISDN). Consequently, there is no need to obtain the location information from the network home location register as a function of the MSN or the MSISDN.

Abstract: A method for controlling handover of a DECT portable part from a first DECT fixed part to a second DECT fixed part during provision of a data service, both fixed parts communicating with a GSM mobile switch center, the method comprising the first fixed part detecting that the handover has been requested, and in response modifying its control of the link between itself and the mobile switch center to inhibit acknowledgement to the mobile switch center of data not received by the portable part from the first fixed part.

Abstract: A mobility processor (34) provides location update parameters to a subscriber unit (SU1-4). The location update parameters indicate conditions upon which the subscriber unit is to provide its location information to the mobility processor. From the location information, the mobility processor determines whether the subscriber unit has provided the location information in a manner that is consistent with the location update parameters. If the mobility processor determines that the subscriber unit did not provide the location information in a manner that is consistent with the location update parameters, the mobility processor generates a new set of location update parameters which are provided to the subscriber unit.

Abstract: A vehicle communication system includes a trainable transmitter that is connected with the antenna associated with the AM/FM radio receiver in the vehicle. The trainable transmitter preferably is capable of learning a variety of communication signals and then later, selectively transmitting them to communicate with a variety of external, remotely located devices. A system designed according to this invention allows a single antenna to be used for emitting signals and receiving signals and, moreover facilitates communication with a variety of remotely located devices such as a garage door opener and a home security system.

Abstract: A radiotelephone includes a housing, and a radiotelephone communications transceiver and display are attached to the housing. A contact-sensitive transducer such as a resistive transducer, a capacitive transducer or a semiconductive transducer, is attached to the housing and produces an output signal that characterizes contact with a contact-sensitive surface of the contact-sensitive transducer. A controller is responsive to the output signal and operatively associated with the display and the radiotelephone communications transceiver, and controls at least one of the display and the radiotelephone communications transceiver according to the output signal of the contact-sensitive transducer. The controller, responsive to the contact-sensitive transducer, may determine a position of contact along an axis of the contact-sensitive transducer. A graphical object is selectively displayed based on the determined position of contact to thereby identify the graphical object, e.g.

Abstract: A method and an apparatus suppresses echo in telephone communication systems having a send path and a receive path. A first filter is coupled to the send path carrying a voice signal. The first filter removes a first set of frequencies but allows either fundamental frequencies or second harmonics in the voice signal to pass through. Thus, the first filter preserves the fundamental frequencies or the second harmonics in the voice signal. A complementary filter is coupled to the receive path carrying the echo. The complementary filter is used to remove the remaining frequencies that are present in the echo. By operating jointly in a complementary way, the first filter and the complementary filter removes the echo.

Abstract: A test circuit of a base station for use of a mobile radio communication system includes a terminal simulator for analyzing radio frequency signals provided from the base station and outputting the analyzed signals to an exam controller; a radio frequency signal path adjuster connected to the terminal simulator, for adjusting a combination and division of radio frequency signals, and a selection of a test path and a level of signals; and the exam controller connected with the radio frequency signal path adjuster, the terminal simulator and an upper level controller, the exam controller being for operating according to a test instruction of the upper level controller or controlling the radio frequency signal path adjuster and the terminal simulator to thereby execute a test and inform the upper level controller of the test result; whereby enabling the test circuit to be performed in a mutual test between sectors of the base station and an unmanned automation test.

Abstract: An improved power output control circuit is used in a mobile station having a transmitter including a transmitter variable gain amplifier developing an RF output signal applied to an antenna. The improved power output control circuit includes a detector circuit for rectifying an input signal to produce a DC output representing power level of the input signal. A sampling circuit is connected to the transmitter and the detector circuit for alternately connecting and disconnecting the RF signal from the transmitter to the detector circuit, whereby the detector circuit develops an alternating DC output signal. A variable gain AC amplifier is coupled to the detector circuit for amplifying the detector output. A gain control circuit is coupled to the AC amplifier for receiving the amplified detector output and comparing it to a select reference to develop a feedback signal used to vary gain of the AC amplifier to maintain a desired constant output level, the feedback signal representing transmitter output power.

Abstract: The present invention customizes a network connection to customer premises equipment using a calibration signal. A network signal processor emits a tag signal indicating that a signal processing platform is in use. Customer premises equipment (CPE) issues a calibration signal to the network signal processor based on detection of the tag signal. The customer premises equipment outputs the calibration signal to the network signal processor which measures the signal loss, adjusts the gain mapping and issues a calibration signal to the customer premises equipment. The customer premises equipment then estimates spectral shaping based on the calibration signal from the network signal processor and equalizes the receive path so that the signal processing platform is detected and implemented. Embodiments of the present invention are illustrative of a more general concept of the use of CPE as an agent in telephone network maintenance.

Abstract: A communication system comprising a set of non-geostationary satellites provides communication links between ground stations and terminals, a communication link from a particular station via a satellite terminating at associated terminals in a limited geographical area including the station and providing a communication channel to at least some of the associated terminals. The communication link is switched to another satellite during the process of communication link handover. A communication link between a particular station and its associated terminals includes an additional communication channel which enables advance data to be transmitted between the particular station and a terminal before the latter executes a communication link handover. This data masks any interruption of communication caused by the communication link handover.

Abstract: A method of detecting a noise level from audio signals produced consecutively in time by a microphone. The method includes the steps of evaluating an average level of the audio signals consecutively in time, and selecting the smallest of the average levels as the noise level. A telecommunication apparatus for adaptively controlling an audio output level in response to the noise level thus detected is also disclosed.

Abstract: A SCR (122) is assigned to a plurality of addresses, and includes a receiver (304) and a processor (308) coupled thereto. The processor is adapted to assign a priority level to each of the plurality of addresses assigned to the SCR. At or near a predetermined time when a message with a corresponding address is to be received in a radio signal, the processor determines a likelihood that the SCR can decode the message according to a predetermined expectation (502). When the likelihood of decoding the message is below the predetermined expectation, the processor disables at least one address assigned to the SCR having a priority level below a predetermined priority level (504, 508). The processor then enables the receiver to receive the radio signal, and disregard one or more messages in the radio signal having an address matching the at least one address that was disabled (510).