Abstract: A method and system for initializing ISDN terminals include selecting a set of call service features and formulating a keymap, the keymap constituting a correlation between the selected service features and feature keys associated with the terminal. The keymap is entered into a memory of the terminal and is uploaded from the terminal to a central office without the necessity of a database administrator entering the keymap data into a central office database. Communication between the terminal and the central office can be facilitated by a universal SPID. After the keymap is uploaded, the central office downloads a SPID unique to the terminal for use in future calls made from the terminal. After the initialization of the terminal is complete, the selection of ISDN service features and the keymap may be revised by entering updated keymap data into the terminal memory and uploading the updated data from the terminal to the central office.

Abstract: In a mobile communication system using spread spectrum, performing respective multiplications of an I and Q channel signals by a spreading code replica, integration over one spreading code period, and square-law detection of the integrated signals to remove data modulation components and residual carrier frequency components. The square-law detected signals are added to obtain signal power over one spreading code period while updating the clock phase of a digital control clock generator. The information of power is stored in a memory in an acquisition mode controller, and the clock phase of the digital control clock generator 30 is fixed at the spreading code replica phase at which a maximum correlation detection power over one spreading code period is obtained. Subsequently, a confirmation mode is started for confirming the spreading code acquisition phase.

Abstract: A multicellular transmission apparatus in a mobile communication network, capable of preventing delay involved in reassembling short packets into fixed length packets (ATM cells), degradation of communication signals due to the delay, and reduction of the transmission efficiency involved in assembling the short packets into the fixed length packets. When low speed information transmitted from a telephone set is converted into short packets by communication data assemblers/disassemblers in a mobile gateway switching center, followed by multiplexing of the short packets into the fixed length packets by fixed length packet assemblers/disassemblers, the short packets sent from a plurality of telephone sets are grouped for each destination node (a particular radio base station, for example) in the network, and are multiplexed into the fixed length packets belonging to the group bound for the destination of the short packets.

Abstract: A private branch exchange is provided having the capability of receiving external alarms via the standard telephony line or trunk interfaces. According to one embodiment, a PBX 200 includes a switching control circuit 202 having line monitor 212 and DTMF 210 capabilities. The switching control circuit 202 is coupled to a central processing unit 204 which in turn is coupled to a memory 206. The memory 206 stores a database 208 identifying a predetermined number of telephony trunk 214 and/or line input/output circuits 218 over which external alarms are to be reported. The CPU 204 identifies an external alarm contact closure as a fault on the telephone line or trunk, thereby insuring proper identification of the location of the alarm.

Abstract: A method for dynamically allocating the capacity of a computer network. All users of the network are classified as low or high priority users. High priority users may broadcast a delay message to the low priority users that cause the low priority users to delay before attempting to use the network. The length of delay can be adjusted if the high priority users are not able to utilize the network as required. In addition, if a low priority user does not receive a broadcast delay message within a predetermined amount of time, the delay period is reset to avoid unnecessary slowing of the network.

Abstract: A telecommunications method and apparatus for sending non-protocol messages from a source to a remote phone terminal having a display includes converting the messages at the source into a format that is compatible with transmission via a signaling channel of a telecommunications line having at least one digital user data channel in addition to the signaling channel. For example, the telecommunications line may be an ISDN link. The formatted messages are visually displayed at the remote phone terminal. As examples, the messages may be menu options of an interactive voice response unit, facsimile documents of a facsimile server, or voicemail messages of a voicemail server.

Abstract: A downlink transmission power control scheme for a mobile communication system using the site diversity, which carries out a primary downlink transmission power control using a primary control signal which is transmitted from the mobile station and terminated at each base station, and an additional downlink transmission power control using additional control signals which are transmitted from the base station control station to the base stations. The additional downlink transmission power control may also use a secondary control signal which is transmitted from the mobile station and terminated at the base station control station. The primary downlink transmission power control can be carried out during a non-site diversity period while the additional downlink transmission power control is carried out during the site diversity period, or the primary downlink transmission power control and the additional downlink transmission power control can be both carried out during the site diversity period.

Abstract: An electronic device (10) having a control circuit (12) for controlling the operation thereof and a battery compartment (14) adaptable configurable for retaining and electrically interconnecting therein either of a first battery configuration (52) and a second battery configuration (54) for providing power to the control circuit (12), the battery compartment (14) comprising a back wall (28) for supporting the battery configurations in the compartment (14), a plurality of side walls (34) extending from the back wall (28) for further supporting the battery configurations (52, 54) in the compartment, a panel (40) hingedly attached within the compartment (14), the hingedly attached panel (40) being rotatable between first and second angular positions, and a plurality of conductive elements (46) within the compartment, wherein a first of the plurality of conductive elements is disposed for physically contacting and electrically interconnecting the first battery configuration (52) when the panel is in the first ang

Abstract: A method and arrangement of utilizing an announcement system to provide paging capability for a facility includes automating the integration of a telephone switch, a voicemail system, and an announcement system. An unanswered call to a telephone of the facility is forwarded to the voicemail system, establishing a first connection between the telephone of the calling party and the voicemail system. The caller is presented with the option of recording a message or initiating a broadcast of an audible page announcement. If the announcement option is selected, a second connection that is separate from the first connection is formed from the voicemail system to the announcement system. An audible announcement identifies the availability of the call for retrieval by the particular called party. In the preferred embodiment, access to the waiting call is restricted to either or both of verification of a password and verification that the retrieval is from one of a limited number of authorized telephones.

Abstract: A housing (100) for a unidirectional microphone (102) is described which has an enclosure (104, 106) for holding the unidirectional microphone. The enclosure has a first plurality of apertures (108, 110, 114) for transmitting acoustic energy to the front and back of the unidirectional microphone. An assembly (116) is movably coupled to the enclosure which, in a first position, facilitates transmission of acoustic energy to both the front and the back of the unidirectional microphone via a first subset of the first plurality of apertures thereby facilitating unidirectional operation. In a second position the assembly inhibits transmission of acoustic energy to the back of the unidirectional microphone by blocking a second subset of the plurality of apertures thereby facilitating omnidirectional operation.

Abstract: A matched filter circuit for mobile communications is disclosed. The circuit may be fabricated in a small size using large-scale integration and can perform high-speed processing and double sampling at a reduced rate of power consumption. In one embodiment, a plurality of sampling and holding circuits each including a switch are divided into two groups. A control circuit successively closes one of the switches in the first group every chip time, while successively closing one of the switches in the second group at a timing shifted by one-half chip time from that of the first group, thereby enabling a double-sampling operation. Outputs of the sampling and holding circuits in each group are summed by an analog circuit with a high degree of linearity, resulting in a high processing speed combined with a reduced circuit size and power consumption.

Abstract: A method of intercepting the incoming and outgoing calls of a telecommunications subscriber. The call activity of the telecommunications line of the subscriber is monitored by a call processor of a telecommunications switch and predetermined types of call activity are recorded by a recording device. The switch monitors the call activity of a second telecommunications line upon the detection of a predetermined call feature occurring for the subscriber and the recording device records predetermined types of call activity on the second line upon the monitoring of the second line. The switch may also switch, upon the detection of the predetermined call feature, from monitoring the call activity of the subscriber line to monitoring the call activity of the second line. The switch may also switch the recording device from recording the call activity of the subscriber line to recording the call activity of the second line.

Abstract: A mobile communication scheme realizing highly reliable handover and improved service quality. The communication signals containing identical communication data are transmitted simultaneously from the mobile station to more than one base stations at a time of the handover, such that reception signals are composed from the communication signals received by more than one base stations by using the reliability information for the received communication signals. For the packet communication, the identification information for identifying each packet is attached to each packet, and the reliability information for each packet is measured, such that the reception packets can be obtained according to the identification information attached to each packet and the reliability information measured for each packet.

Abstract: An antenna device having two resonance frequencies wherein two radiating patches are respectively provided on one surface and on the other surface of a dielectric plate which is disposed above a ground plate with a space interposed therebetween. A coupling control capacitor element is connected between these two radiating patches and resonance control capacitor elements are connected between the radiating patches and the ground plate, respectively. Capacitance of the coupling control capacitor element is selected such that a current coupled from one of the two radiating patches to the other and a current supplied from the said one of the radiating patches to the other via the coupling control capacitor element are in opposite phase at the other one of the radiating patches.

Abstract: A CDMA system capable of quickly establishing acquisition of a long code, a spreading code with a period considerably longer than a symbol length. The received phase of the long code is estimated by inserting an a priori code into a spread signal which is spread by the long code at a fixed interval, and by detecting the start timing of receiving the a priori code, where the a priori code has a correlation value of nearly zero with the long code, and an autocorrelation value of a triangular profile. Its transmitter has an a priori code inserting circuit, and its receiver has a replica generating circuit of the a priori code. In addition, the system includes a plurality of correlators for obtaining correlation values between the received signal and the replica of the a priori code, and a circuit for obtaining the maximum correlation values and their start timings of reception among these correlation values.

Abstract: A joint signal detection and channel parameter estimation scheme is provided for multiple subcarrier signaling with pilot symbol-assisted modulation schemes. Known symbols located in the subcarriers are used to estimate a pair of parameters associated with the generation process of the fading frequency selectivity common to all of the subcarriers. These known symbol estimates are used to derive parameter pair estimates for unknown symbols located in the subcarriers. This parameter estimation thus effectively extracts information regarding the fading frequency selectivity through the pilot symbols received not only by the subcarrier of interest but by other subcarriers as well. The fading complex envelope with each subcarrier is then derived from the estimates of the parameter pair.

Abstract: The present invention realizes a rapid and efficient cell search and small-size instrument for an asynchronous DS-CDMA cellular system. This cell search detects the correlation between the received signal and the short code of the control channel, and matched filter 22 detects the maximum electric power correlation peak location. Next, using correlators 28-1 to 28-n which are parallelly set in a plurality for RAKE processing with plurality, identifies the long code that is set in the system with the detected long code timing. After the long code is synchronized, a multipath signal is received using 28-1 to 28-n, and the data is judged by RAKE processing. When peripheral cell search is executed, after long code timing is detected by using matched filter 22, the long code of the candidate peripheral cell is designated using the same matched filter. Handover is safely realized by receiving the signal from the connected base station by correlators 28-1 to 28-n, and the base station signal through handover by 22.

Abstract: A system and method for supporting digital communications for a single-premises wireline digital telephone include converting between a first signaling format that is compatible with conventional bidirectional wireline telecommunications and a second signaling format that is compatible with bidirectional wireless telecommunications. In the preferred embodiment, the single-premises telephone is a feature phone having a visual readout or light display that is activated upon receiving party-specific call messages. A connection from the digital telephone to an interface may include protocol conversion and/or digital-to-analog conversion that utilizes the first signaling format. On the other hand, signal transfers between the interface and the transceiver utilize the second signaling format. In one embodiment, the single-premises digital telephone is remotely located from a switching network, such as a private branch exchange, so that the switching network supports the call features of the feature phone.

Abstract: A loop detector circuit for detecting the loop current of a telephone circuit in a ground start mode and a normal mode which obviates the need for a separate TIP ground detector circuit. A pair of light emitting diodes (LED) 52, 54 are associated with a photoelectric device, such as a phototransistor 56, 58, connected across TIP and RING with a series resistor. Each resistor 60, 62, is selected to provide a predetermined voltage drop during a ground start mode and a normal mode, thus enabling the loop detector to detect loop current during both modes. The loop detector circuit is thus able to detect the off-hook status of a subscriber handset during a ground start mode without the use of a separate TIP ground circuit.