摘要:
A multi-mode communication device (100) uses a quadrature transmitter (102) for transmitting both amplitude and constant envelope angle-modulated signals. For angle modulation, a separate feedback path is used from that used for amplitude modulated signal transmission. An FM receiver (136) is used to produce error signals (214, 216) used in correcting the I and Q quadrature signals (206, 208).
摘要:
A mobile communication device (202) and peer mobile communication devices (204, 206) are capable of direct voice and data communication. The mobile communication device has a reference oscillator (104) which is used for generating operating frequencies, and is subject to frequency errors resulting from manufacturing tolerances, heat, and other error sources. The mobile communication device receives a frequency correction message (506) from a peer mobile communication device that has calibrated its reference oscillator. The frequency correction message contain offset information which is used by the mobile communication device to determine its offset (316) from a nominal frequency (302).
摘要:
A method (400, 500) of identifying a route traveled. The method can include, while traveling away from an initial location (115), detecting a unique identifier for each of a plurality of wireless communication devices (125) along the route. The method also can include presenting an indicator (210) that indicates a relative distance from at least one of the wireless communication devices while traveling toward the initial location. Detecting the unique identifier for each of the plurality of wireless communication devices can include detecting a media access control (MAC) identifier or an Internet protocol (IP) address for at least one of the communication devices.
摘要:
A method of managing antenna usage within a communication device can include determining selected transceivers of a plurality of transceivers requiring a connection with an antenna (410) and identifying diversity requirements for the selected transceivers (420). A plurality of antennas can be allocated among the selected transceivers according to the diversity requirements (425, 430).
摘要:
A method (600) for prioritizing communication services across multiple service initiators in a multi-modal communication device (110). The method can include establishing an inter-process communications link (140) between a first processor (125) and at least a second processor (130) within the communication device. Responsive to a request (202) for a first service provided by the first processor, a determination can be made whether the first service has a higher priority than a second service currently active on a second processor. A conflict message can be provided in response to the second service having a higher priority than the first service, or at least one process, such as initiation of the first service, can be implemented in response to the first service having a higher priority than the second service. Further service initiated messages (204, 206) can be communicated from the second process to an external device and to the first processor.
摘要:
A communication system (100) for bridging talk groups includes private network communication devices (102) operating within a private network system, and public network communication devices (110, 122, 112) operating within a public network system. At least one communication subsystem (104) is operable with both the private and public network systems. The communication subsystem (104) relays information between the private network communication devices (102) and the public network communication devices (110, 122, 112).
摘要:
A method and system for responding to an emergency situation from a mobile communication device (100) is provided. The method includes initiating (306) a call to an emergency services number using a first modem (202) of the mobile communication device. The first modem communicates with a communication system via a first air interface. Further, the method includes detecting (308) the initiating of the call to the emergency services number. Furthermore, the method includes initiating (310) automatically an emergency transmission using a second modem (204) of the mobile communication device in response to detecting the call to the emergency services number. The second modem uses a second air interface for emergency transmission. The emergency transmission is performed concurrently with initiating the call to the emergency services number.
摘要:
A method (200) for improving quality of output audio (126). The method can include detecting an output acoustic signal (128) and generating a receive audio signal (134) based, at least in part, on the detected output acoustic signal. A frequency domain representation (140) of the receive audio signal can be compared to a frequency domain representation (138) of a source audio signal (124) from which the output acoustic signal is generated. At least one distortion signal (142) in the receive audio signal can be identified, and the source audio signal can be selectively equalized to reduce an amplitude of the source audio signal at a frequency that correlates to the distortion signal.
摘要:
A method (400, 500) of identifying a route traveled. The method can include, while traveling away from an initial location (115), detecting a unique identifier for each of a plurality of wireless communication devices (125) along the route. The method also can include presenting an indicator (210) that indicates a relative distance from at least one of the wireless communication devices while traveling toward the initial location. Detecting the unique identifier for each of the plurality of wireless communication devices can include detecting a media access control (MAC) identifier or an Internet protocol (IP) address for at least one of the communication devices.
摘要:
A system and method of retrieving dispatch call information from a dedicated database by using interconnect call information. Interconnect call information from an interconnect communication system is obtained. The information identifies a target dispatch subscriber unit in a dispatch communication system. A request is received from a source dispatch subscriber unit. The request includes the interconnect call information. The interconnect call information identifying the target dispatch subscriber unit is extracted from the request. The interconnect call information of the target dispatch subscriber is related to unique dispatch call connection information of the target dispatch subscriber in a dedicated database. The unique dispatch call connection information concerning the target dispatch subscriber unit from the dedicated database in the dispatch communication system is retrieved using the extracted interconnect call information from the request.