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2833 results about "Duration time" patented technology

Duration may refer to: The amount of elapsed time between two events. Duration (music) – an amount of time or a particular time interval, often cited as one of the fundamental aspects of music. Duration (philosophy) – a theory of time and consciousness first proposed by Henri Bergson.

Method and system of program transmission optimization using a redundant transmission sequence

A system and method of optimizing transmission of a program to multiple users over a distribution system, with particular application to video-on-demand for a CATV network. The system includes, at a head end of the CATV network a scheduling and routing computer for dividing the video program stored in long term fast storage or short term fast storage into a plurality of program segments, and a subscriber distribution node for transmitting the program segments in a redundant sequence in accordance with a scheduling algorithm. At a receiver of the CATV network there is provided a buffer memory for storing the transmitted video program segments for subsequent playback whereby, in use, the scheduling algorithm can ensure that a user's receiver will receive all of the program segments in a manner that will enable continuous playback in real time of the program. Under the control of controller the receiver distinguishes received program segments by a segment identifier so that redundant segments captured in capture memory are then stored in buffer memory from which the segments can be retrieved and decompressed in data compressor for immediate or subsequent viewing. In one embodiment, the method of this invention includes dividing at least some segments into fragments, and transmitting one fragment of each segment during a playback interval of a duration, for example, equal to a playback time of a segment.

Method and system for enhancing reliability of communication with electronic messages

A system for enhancing the reliability of communicating with electronic messages. The system sends an electronic message to designated recipients, and then automatically helps ensure that each message has been successfully delivered within a specified period of time and that each message has been reviewed within a specified period of time. In addition, the system automatically performs specified activities after review of a message takes place. The sender of an electronic message initiates reliability-enhanced messaging by specifying message delivery information and message review information. The sender can specify that if delivery or review notifications are not received within specified periods of time, the message will be resent to the recipient or a reminder message will be sent to the recipient or to another user. The message information can include various frequency and duration options, such as resending a message only once or resending it every 2 hours for a week. Message information can also specify to resend the message with a higher transmission priority or review urgency so that its delivery and review is more likely, or could specify to use a different recipient system for the recipient (e.g., to a second email address if a first address fails, or to a pager if a cellular phone is not available). Each recipient of a message can have individualized message delivery information. The system tracks whether each message has been delivered to each recipient, and uses the message delivery information to resend the messages whose delivery and review was not confirmed.

Method and mobile station to perform the initial cell search in time slotted systems

A method is disclosed that a Mobile Station MS performs at switch-on to search the most favorable target cell in UMTS systems like the 3GPP CDMA—LCR (Low Chip Rate) option at 1.28 Mcps—TDD (Time Division Duplex) mode and the equivalent TD-SCDMA (Time Division—Synchronous CDMA). Signal at the MS antenna is the sum of different RF downlink frames coming from different carriers in the assigned frequency ranges. A DL synchronization timeslot and a BCCH TS0 are both transmitted with full power in the frames, the first one includes one out of 32 SYNC codes assigned on cell basis. Following a conventional approach the absence of a common downlink pilot and without prior knowledge of the used frequencies would force the MS, for all the frequencies of the channel raster stored in the SIM card, the correlation of the received frame with all the 32 SYNCs stored in the MS, in order to detect the BSIC of a cell to which associate the power measures. Following the two-step method of the invention the power measures are performed in two-step scan of the PLMN band without interleaved correlation steps; once a final frequency is selected the respective frame is the only correlated one. At least one frame duration about 5 ms long of the whole 15 MHz bandwidth is acquired, IF converted, A/D converted and the digital set is stored. A rough scan is performed multiplying the digital set by a digital IF tuned in steps wide as the channel band (1.6 MHz) along the 15 MHz band, and filtering the baseband signal with a Root Raise Cosine low-pass filter. The 5 ms baseband signal is subdivided into 15 blocks of half timeslot (337.5 μs) and the power of each block is measured. The power of the strongest block indicates the priority of the respective frequency. The strongest power values are put in a Spectral Table together with respective frame load indicators. The load indicator is the percentage of timeslots in a frame almost equally loaded as the strongest block. The three strongest frequencies are selected for the successive scan. The second step search is performed like the first one but the IF steps are now 200 kHz wide and cover the only 1.6 MHz spectrum around a selected frequency. A final frequency is selected for the successive correlation step. Then the frequency error of the MS reference oscillator is corrected with data-aided techniques and a calibration value stored for successive connections (FIG. 9).
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