Data transmission

Details Data transmission Data transmission

2002-12-05

2008-09-23

Ngo, Ricky (Department: 2616)

Multiplex communications

Communication techniques for information carried in plural...

Adaptive

C370S235000, C370S326000, C370S422000, C370S493000

Reexamination Certificate

active

07428244

ABSTRACT:
In order to measure the rate at which a terminal2can receive data from a source5, 6, 7the source temporarily increases it transmitting rate. The time taken to receive these higher-rate transmissions is measured at the terminal (or acknowledged by the terminal and measured at the transmitter) and the rate calculated. Inter alia, these measurements can be used for control of layered coding where apparatus for transmitting signals to video or other terminals2has coding means5for receiving the signals to generate a base signal stream B which is a coarse representation of the signal to be transmitted and at least one higher order stream E1, E2containing finer detail of the signal not present in any lower order stream. These streams are sent by transmitting means6to the terminals, but at least some of the terminals do not receive all of the higher order streams. Control means7receives signals Xkindicative of the measured data-receiving capacity of the terminals and calculates, based on the measured capacities, an adjustment for the coding means to make to the data rates of the streams.

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