Abstract:
A communication system has an information signal having a plurality of data streams (72, 77, 92). The data streams are simultaneously modulated on a multi-level symbol transmission (110). The data streams may have either independent or dependent signalling protocols. A transmitting means (105) generates the information in one of several embodiments. A first receiver (200) receives the information signal and processes only a first data stream for messages. A second receiver (300) receives the information signal and processes only the second data stream for messages. A third receiver (400) is capable of selectively receiving and processing a plurality of data streams. The third receiver is shown in several embodiments for selecting the data streams.
Abstract:
A messaging system and method capable of transmitting group messages throughout a Network (200) such that receivers which are outside of a 'local' or 'home' area of coverage receive such group messages, whereas receivers which are in a 'local' area of coverage override and do not receive the group message.
Abstract:
A selective call receiver includes a receiver (103), a controller (105), and a display (113) for presenting a recovered source document. The receiver (103) provides a received paging message that was generated from the facsimile message of the original source document (208). The received paging message is interpreted and decoded by the controller (105). Using the display (113), a decoded scan line compressed document (1101) is presented in a format tht substantially resembles the facsimile message of the original source document (1100).
Abstract:
A method and apparatus for reliably delivering messages (200) from a central terminal (102) to a communication receiver (130) in a communication system (100), such as an electronic mail system. The central terminal (102) transmits messages (1300) to the communication receiver (130) and the communication receiver (130) receives transmitted messages (1300) over a first communication medium (122). The communication receiver (130) reconciles messages that it failed to receive over the first communication medium (122) with the central terminal (102) over a second communication medium (152). The reconciliation process between the communication receiver (130) and the central terminal (102) utilizes message identifiers (1308) transmitted with the messages (1300) to identify the messages (1300) being reconciled.
Abstract:
A method for time-scale modification of speech using a modified version of the Waveform Similarity based Overlap-Add technique (WSOLA) comprises the steps of storing a portion of an input speech signal in a memory, analysing the portion of the input speech signal providing an estimated pitch value (12), determining a segment size (14) in response to the estimated pitch value and time-scaling (18) the input speech signal for a given time-scaling factor and in response to the determined segment size.
Abstract:
An apparatus and a method in a radio communication system repeatedly transmit and receive identifiers (204, 208) including a nearby identifier received by a radio receiver (110, 112) from a nearby transmitter (104), and distant identifiers (204, 208) received from more distant transmitters (104). The method and the apparatus distinguish (720) in a probabilistic manner the nearby identifier (204, 208) from the distant identifiers (204, 208) by determining (712) the identifier (204, 208) received most dependably over a predetermined period.
Abstract:
A data communication receiver (106) is assigned for receiving message signals within one or more message transmission frames (Fig. 3) transmitted in a predetermined sequence. The message signals include address (1604) and message (1608) information, and information (1710) designating one or more additional message transmission frames to which the data communication receiver (106) is responsive for receiving the message signals.
Abstract:
A method and apparatus adaptively selects a communication strategy for communicating a message in a selective call radio communication system including a fixed portion (100) and a portable portion (101). The fixed portion (100) transmits (402) an alert signal to the portable portion (101), and awaits (404) an acknowledgment signal including a signal quality estimate from the portable portion (101). The portable portion (101) receives (602) the alert signal, and computes (604, 606) the signal quality estimate therefrom. The portable portion (101) then sends (608) the acknowledgment signal to the fixed portion (100). In response to the acknowledgment signal, the fixed portion (100) selects (407) a transmission strategy in accordance with the signal quality estimate. For compatibility, the transmission strategy requires a matching reception strategy in the portable portion (101). After sending the acknowledgment signal, the portable portion (101) selects (609) the matching reception strategy in accordance with the signal quality estimate sent in the acknowledgment signal without requiring further communication with the fixed portion (100).
Abstract:
An improved frequency scanning communications system (108, 109, 110, 111, 11 2) that dynamically optimizes the sequence and time ordering of available signalling frequencies: The system includes a selective call communication receiver (101, 102, 103, 104, 105, 106, 107) comprising means for scanning a list of predetermined channels (104) to classify said channels in a priority order and means for receiving information (103) from said channels in accordance with said priority order.