Abstract: A power amplifier circuit for receiving a variable envelope input signal and for producing an amplified output signal is provided. The power amplifier circuit includes an envelope approximation circuit, an envelope amplifier circuit, a phasor approximation circuit, a quadrature modulation circuit, and a power amplifier. The envelope approximation circuit receives the variable envelope input signal and produces a bandlimited estimated envelope signal, corresponding to the amplitude of the variable envelope input signal. The bandlimited estimated envelope signal is then amplified by an envelope amplifier circuit. The amplified envelope signal is then coupled to the supply input of the power amplifer. The phasor approximation circuit receives the variable envelope input signal and produces a bandlimited estimated phasor signal. The quadrature modulation circuit receives the estimated phase signal and produces a modulated phase signal.

Abstract: A bi-directional hands-free communication device includes a microphone for transmitting a signal along a transmit path and a speaker receiving a signal transmitted along a receive path and outputting a corresponding output signal. An echo canceller, positioned in the transmit path and the receive path, cancels echo signals induced by the microphone from the speaker and outputs a corresponding cancelled signal along the transmit path, and a transparency circuit distributes state-dependent additional loss derived from the noise floor margin to the transmit path and the receive path to reduce residual echo signals output from the echo canceller.

Abstract: A programmable correlator for a communication system includes an input queue coupled with an analog-to-digital converter (ADC). The input queue includes a random access memory (RAM) wherein sampled data streams from the ADC are written into the RAM. The input queue has two banks of memory of width 2M. A flexible complex correlator is operable on M samples. The correlator is coupled to read M complex samples out of 2M samples from the input queue. A pseudo-noise (PN) crossbar unit operates to rotate a generated PN code to match a rotation of the input queue data in the complex correlator.

Abstract: An electronic device such a telephone (100), PDA (600), or pager (800), includes a manually operable input such as an elastomeric key (102, 103) or button (814), or a touch screen (604) that does not by itself provide substantial tactile feedback upon actuation, and also includes an electromechanical transducer (212) that is capable of generating an impulse of mechanical energy that can be felt. In response to detecting actuation of the manually operable input (102, 103, 814, 604), the electromechanical transducer (212) is driven to produce an impulse of mechanical energy that propagates to the manually operable input (102, 103, 814, 604) and provides tactile feedback to a user.

Abstract: A method of and apparatus for optimizing a minimum turn around time (MTAT) between (a) a reception by a first device of a first infrared data communication (IRDC) frame sent from a second device and (b) a transmission by the first device of a second IRDC frame to the second device. The MTAT value received from the second device is loaded into a storage device. The first IRDC frame from the second device is received, and a counter of the first device either resets upon reception of each of the plurality of characters of the first IRDC frame or increments when none of the plurality of characters are received. The first device transmits the second IRDC frame to the second device when the counter value reaches the MTAT value.

Abstract: A wide area communication system (100,200) employs a method and apparatus for providing a localized information (410) to a communication device (500) located in the wide area communication system (100,200). The wide area communication system (100,200) includes a plurality of local coverage areas (110-112, 219-225) that are each served by one or more broadcast transmission sites (103-108, 203-212). A broadcast transmission site (300) providing communication service to a local coverage area that includes the communication device (500) transmit, during a first pre-allocated time interval and/or together with a first pre-allocated broadcast address, information relating to their local coverage area.

Abstract: A holster (10) for a telecommunication device (12), such as a cellular telephone or wireless telephone, includes a housing (14) adapted to removably support the telecommunication device (12). The holster (10) also includes an earpiece assembly (52) including at least one transducer, such as an earbud (53) or a microphone (54), and a cord (56) depending from the at least one transducer (53, 54). The earpiece assembly (52) is extendable and retractable relative to the housing (14). The holster (10) further includes an extension/retraction assembly (32) having a spool (34) for taking up at least a portion of the cord (56) when the earpiece assembly (52) is retracted relative to the housing (14), and at least one coil spring (35) adapted to rotate the spool (34). The at least one coil spring (35) can electrically couple the at least one transducer (53, 54) to the telecommunication device (12).

Abstract: A mechanism for notifying a mobile station of receipt of a packet-switched paging message in a GSM communication system. A base station controller (108) sends the packet-switched paging message to the mobile station (116) along a main dedicated control channel in response to the mobile station being capable of operating in a dual transfer mode and being currently engaged in circuit-switch voice interchange activity, resulting in a simultaneous voice and data transmission in dual transfer mode.

Abstract: A novel retractable antenna which enables dual-band operation in two different positions of the antenna is described. Further, the novel retractable antennas are couple to a variety matching circuit arrangements according to various embodiments of the present disclosure to eliminates the use of electrical or mechanical switching of two different matching circuits.

Abstract: A dispatch system generally provides a means for collecting destination information, selecting a dispatch assignment (104) to be dispatched to the destination (102) and dispatching the selected assignment. In situations where the response time of the assignment is a critical factor, selecting the assignment with the shortest response time is desired. An improved method for improving response time of an assignment with the shortest response time incorporates assignment location, a road condition associated with each assignment, and the traffic conditions associated with each assignment. Event information is also considered in determining the best route and travel time from the mobile entity to the destination.

Abstract: A receiver automatic gain control includes a variable gain receiver having a control input and responsive to a gain control signal for adjusting the output level of the receiver. A controller is coupled to the variable gain receiver. The controller monitors a received signal quality and a received signal power level. The controller generates a control signal for controlling the gain of the variable gain receiver as a function of the signal quality and the power level. The controller controls the gain as function of the received signal power level and selectively controls the gain as a function of the signal quality.

Abstract: A self-contained camera device (10) and method for capturing and communicating images via a modem (13). The self-contained camera device (10) comprises an image capturing device (15) and a chassis (11) for receiving a storage module or a modem (13). A removable modem (13) is mountable on the chassis (11) and couplable to the image capturing device (15). The removable modem (13) is replaceable with the storage module.

Abstract: A handheld electronic device comprising, a housing (200) including a first housing portion (202) and a second housing portion (204). The first housing portion contains at least two user interfaces (208, 504), and the second user interface includes at least one user interface (212). The two housing portions are coupled by a swivel hinge (214) that allows the two housing portions to rotate about a first axis (302) such that the housing fold together, and a second axis (304) perpendicular to the first axis, allowing the housings to rotate relative to one another. Each user interface (208,504,212) can be configured as an input device, output device, or combination thereof. Having multiple user interfaces allows the electronic device to operate in a plurality of modes. The user can adapt the housing by rotating the either of the two housing portions to the position associated with the desired operation mode.

Abstract: A cradle for a wireless device such as a cellular telephone. The cradle provides a second antenna for antenna diversity operation of the wireless device. Optionally, the cradle contains any of hardware circuitry, processing, and software to provide antenna diversity operation in conjunction with the wireless device.

Abstract: Transceiver circuitry 1 comprises a first portion 10,20,30,41,50,100, having a first modulation means 41 operating at a first order of modulation, for transmitting and receiving voice signals; a second portion 20,30,42,50,100, having a second modulation means 42 operating at a second order of modulation, for transmitting and receiving digital signals at a higher data rate than is achievable by the first portion; and a data conversion means 20,30,100 operable to convert from or into voice signals intended for processing by the first portion into or from digital signals for processing by the second portion.

Abstract: A non-GSM network that uses a GSM serving GPRS support node (40) and a gateway support node for providing packet service to transmit a message capsule (52) containing one or more signaling messages between a mobile station (36) and a mobile switching center (46). The mobile station (36) constructs an uplink tunneling of messages protocol envelope (48) that includes, in addition to a uplink message capsule, information specific to non-GSM protocols and the serving GPRS support node (40) determines a destination of the uplink message capsule based on a routing area identifier and the information specific to the non-GSM protocols. The serving GPRS support node (40) constructs a downlink tunneling of messages protocol envelope that includes a downlink message capsule and information specific to the non-GSM protocols and transmits the downlink tunneling of messages to the mobile station (36) and the mobile station extracts the downlink message capsule based on the information specific to the non-GSM protocols.