Abstract: A system and a method for transforming an N-bit input value into a transformed N-bit output value which may be used for error correction coding or ciphering of the N-bit input value. In a representative embodiment, the system comprises means for providing a set of all possible N-bit values as a plurality of mutually exclusive subsets each containing at least one possible N-bit value; means for comparing the N-bit input value with each of the subsets to determine to which one of the subsets the N-bit input value belongs; and means for selecting as the transformed N-bit output value an N-bit value from another one of the subsets. In accordance with the present invention, each of these subsets may be cyclically generated in a linear feedback shift register (LFSR) or, alternatively, stored in a memory.

Abstract: A system for transporting radio frequency (RF) signals across a RF network comprises a central transport unit and a remote transport unit. The frequencies of at least some of the RF signals to be transported hop in accordance with predetermined hopping sequences. The central transport unit uses the hopping sequences to convert the hopping frequencies into fixed frequencies for efficient transport through the RF network. The remote transport unit uses the hopping sequences to convert the fixed frequencies back to the original hopping frequencies. The transport system is also capable of reverse operation in the direction from the remote transport unit to the central transport unit.

Abstract: A system and method for directing mobile stations from an analog control channel (ACCH) to a digital control channel (DCCH). According to the present invention, a dual-mode mobile station transmits over the ACCH a system access message (e.g., registration access message) to the system. The system recognizes the access to be from a dual-mode mobile station and selects a DCCH based on the subscriber profile and current location of the mobile station. The system then sends over the ACCH a mobile station control message (e.g., registration confirmation message) including data identifying the selected DCCH to the mobile station.

Abstract: An electronic mail (E-mail) delivery system for delivering E-mail messages to and from a subscriber station in a wireless or wired communications system. The E-mail delivery system converts E-mail messages sent to the subscriber station from text to speech for delivery to the subscriber station. Furthermore, the E-mail delivery system converts E-mail messages sent by the subscriber station from speech to text for delivery to a remote destination.

Abstract: In general, the present invention provides a low cost mechanism for reducing the settling time and/or improving the phase noise performance of a frequency synthesizer in a mobile station. In one embodiment, the present invention eliminates the need for using two transmit offset synthesizers in a mobile station which must be able to operate on two different frequency bands characterized by different transmit-receive (TX-RX) channel separation. According to the present invention, one or both of the transmit offset synthesizers may be eliminated by deriving an appropriate transmit offset signal from an auxiliary synthesizer in the mobile station through a relatively simple and inexpensive frequency scaling circuit (e.g., frequency divider or multiplier), and by using a fast settling main channel synthesizer to hop between two different frequencies when the mobile station is switching between transmitting and receiving, respectively.

Abstract: A call processing system for a wireless communications network comprises a mechanism for detecting a call placed from a mobile station in the network to a multi-digit number dialed by a user of the mobile station; a mechanism for determining whether the call is indicated to be fraudulent; a mechanism for determining whether the dialed number is a predefined multi-digit emergency number; a mechanism for completing the call if the call is indicated not to be fraudulent, or if the dialed number is determined to be an emergency number even if the call is indicated to be fraudulent; and a mechanism for blocking the call if the call is indicated to be fraudulent and the dialed number is determined not to be an emergency number.

Abstract: A touch screen input device includes a display screen adapted for receiving a touch input from a user; mechanism for sampling the touch screen input at any one of a plurality of sampling rates; mechanism for storing a predetermined sampling rate for each application or for each function; and mechanism for setting the sampling rate of the sampling mechanism to the sampling rate stored for a given application or a given function whenever that given application is being executed or that given function is being performed, respectively. In an alternative embodiment, the rate of change of the touch screen input sample points is measured and the sampling rate increased or decreased when the rate of change of the sample points increases or decreases, respectively.

Abstract: A method for detecting fraud in a cellular radio telephone system. Fraud is suspected when the system detects a multiple access from a mobile station, when an activity collision occurs, when the system receives a premature registration from the mobile station, when auditing or operator-initiated locating of the mobile station reveals the existence of the mobile station in two locations simultaneously, or when tracing of mobile subscriber activity reveals unusual activity.

Abstract: A dual band mobile station including a main channel synthesizer and an offset synthesizer for generating the transmit frequency and the receive intermediate frequency (IF) required for operation in each of two different bands characterized by different transmit-receive channel offsets. According to the present invention, the main channel synthesizer does not have to change its frequency when the mobile station switches between transmission and reception in either of the two bands so long as a common IF is selected for both bands, which is equal to one or the other of the channel offsets. This IF selection also allows for a reduction in the tuning range of the main channel synthesizer.

Abstract: A system and method for directing mobile stations from an analog control channel (ACCH) to a digital control channel (DCCH). According to the present invention, a dual-mode mobile station transmits over the ACCH a system access message (e.g., registration access message) to the system. The system recognizes the access to be from a dual-mode mobile station and selects a DCCH based on the subscriber profile and current location of the mobile station. The system then sends over the ACCH a mobile station control message (e.g., registration confirmation message) including data identifying the selected DCCH to the mobile station.

Abstract: A system and a method for managing calling name (CNAM) queries in a plurality of telephone networks including a plurality of subscribers each assigned a telephone number in a predetermined number series associated with a particular switch in one of the telephone networks, wherein at least one of the number series is a portable number series including telephone numbers assigned by one network but connected to another network. According to the present invention, if the calling party number (CgPN) belongs to a portable number series, gapping will be applied to CNAM queries containing either portable telephone numbers associated with a location routing number (LRN) identifying the switch and network to which the CgPN is connected, or non-portable telephone numbers belonging to the same number series as the LRN. On the other hand, if the CgPN does not belong to a portable number series, gapping will be applied to CNAM queries containing telephone numbers belonging to the same number series as the CgPN.

Abstract: The present invention allows for the detection of data contained in transmitted messages (e.g., page messages) at a selected early point in the receiving and decoding process. By forming, at that point, a received data vector (RDV) from the data corresponding to a received message, and by comparing the RDV with one or more test data vectors (TDVs) representing selected relevant or irrelevant data contained in transmitted messages, the receiver (e.g., mobile station) can determine whether the received message contains relevant data which should be fully decoded or irrelevant data which does not need to be fully decoded. In this manner, substantial processing and power savings can be achieved in the receiver.

Abstract: A security door assembly or locking mechanism for securing a single door in locking engagement with an adjacent door jamb structure comprises a first elongate metal blade to be received by a matching elongate groove in a vertical edge of a door. A second elongate metal blade is received by a matching groove in an upper horizontal edge of the door. Mechanical devices are provided for moving said blades partially from the grooves in the door into engagement with receiving grooves in the adjacent door jamb structure to lock the door. The vertical and horizontal blades are coupled together by a linkage mechanism which enables both blades to be operated simultaneously upon actuation of a single lever or knob. The blades and the linkage mechanism are mounted in an L-shaped housing inserted into grooves formed in adjacent edges of the door. Elongate metal strips are provided to be mounted over the grooves in the door jamb.

Abstract: A mechanism for reducing a frequency transient appearing at the output of a voltage controlled oscillator (VCO) in a frequency synthesizer when a load is connected to the VCO. In accordance with the present invention, the magnitude and direction of (a) the frequency transient and (b) the frequency deviation of the VCO signal in response to a reference input voltage may be measured, and those measurements used to generate a frequency correction voltage which would cause the VCO signal to deviate in an equal amplitude but in an opposite direction to the frequency transient. The frequency correction voltage then can be applied to the VCO when it is connected to the load so as to substantially cancel the frequency transient.

Abstract: The present invention allows a mobile station to receive a command entered by a user for selecting among a plurality of possible values for an authentication key (A-key) stored in its memory, including a default value, a random value and a custom (user-defined) value for the A-key. In response to the command, the mobile station can set the A-key in its memory to the default value or to an internally generated or previously stored random value, or to the custom value entered by the user. The command, whether for selecting the default, random or custom A-key value, may be entered during number assignment module (NAM) programming of the mobile station.

Abstract: The present invention provides a method and apparatus for controlling the operations of a battery-powered mobile station based on the capacity of its battery. In accordance with the present invention, the mobile station monitors the capacity of its battery to determine whether it has fallen below any one of a plurality of threshold capacity values. When the capacity of the battery falls below the highest of these threshold values, the mobile station sends a registration cancellation message to the serving system and then disables the transmit operation in order to conserve power. Other operations of the mobile station are systematically disabled if the battery capacity falls below one or more lower threshold values.

Abstract: The present invention provides a system for simulcasting and diversely receiving radio frequency (RF) signals. The system of the present invention comprises at least one RF transceiver and a plurality of RF units each including a transmitter for simulcasting an RF signal to a user and further including one receiver which is paired with another receiver in another one of the RF units, the pair of receivers providing for diversity reception of an RF signal from the user. The implementation of diversity reception with only one instead of two receivers in each RF unit, as taught by the present invention, reduces both signal loss and required cabling in the system.

Abstract: A system and a method for transforming an N-bit input value into a transformed N-bit output value which may be used for error correction coding or ciphering of the N-bit input value. In a representative embodiment, the system comprises means for providing a set of all possible N-bit values as a plurality of mutually exclusive subsets each containing at least one possible N-bit value; means for comparing the N-bit input value with each of the subsets to determine to which one of the subsets the N-bit input value belongs; and means for selecting as the transformed N-bit output value an N-bit value from another one of the subsets. In accordance with the present invention, each of these subsets may be cyclically generated in a linear feedback shift register (LFSR) or, alternatively, stored in a memory.

Abstract: A system and a method for echo suppression which use two or more microphones for beamforming of an echo signal corresponding to an incoming speech signal that is output by a loudspeaker. The outputs of the microphones are appropriately filtered and then linearly combined to cancel the echo signal, even if the incoming speech signal has been non-linearly distorted. Also, the microphones may be selectively positioned or pointed to allow the linear cancellation of ambient noise.

Abstract: A method for detecting fraud in a cellular radio telephone system. Fraud is suspected when the system detects a multiple access from a mobile station, when an activity collision occurs, when the system receives a premature registration from the mobile station, when auditing or operator-initiated locating of the mobile station reveals the existence of the mobile station in two locations simultaneously, or when tracing of mobile subscriber activity reveals unusual activity.