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September 20, MX 7 June 06, Toggle navigation. Language Language U. MX 7 Real Time Yocto.


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Recommended Webinars. Our Partners. Subscribe to our Newsletter. Connect with us. If the line asymptotically grows longer and longer without bound, the checkout process is not real-time. If the length of the line is bounded, customers are being "processed" and output as rapidly, on average, as they are being inputted and that process is real-time. The grocer might go out of business or must at least lose business if they cannot make their checkout process real-time; thus, it is fundamentally important that this process is real-time. A signal processing algorithm that cannot keep up with the flow of input data with output falling farther and farther behind the input is not real-time.

But if the delay of the output relative to the input is bounded regarding a process that operates over an unlimited time, then that signal processing algorithm is real-time, even if the throughput delay may be very long. Real-time signal processing is necessary, but not sufficient in and of itself, for live signal processing such as what is required in live event support. Live audio digital signal processing requires both real-time operation and a sufficient limit to throughput delay so as to be tolerable to performers using stage monitors or in-ear monitors and not noticeable as lip sync error by the audience also directly watching the performers.

Tolerable limits to latency for live, real-time processing is a subject of investigation and debate but is estimated to be between 6 and 20 milliseconds. Real-time bidirectional telecommunications delays of less than ms "round trip" or twice the unidirectional delay are considered "acceptable" to avoid undesired "talk-over" in conversation. Real-time computing is sometimes misunderstood to be high-performance computing , but this is not an accurate classification. Conversely, once the hardware and software for an anti-lock braking system have been designed to meet its required deadlines, no further performance gains are obligatory or even useful.

Furthermore, if a network server is highly loaded with network traffic, its response time may be slower but will in most cases still succeed before it times out hits its deadline. Hence, such a network server would not be considered a real-time system: temporal failures delays, time-outs, etc. In a real-time system, such as the FTSE Index , a slow-down beyond limits would often be considered catastrophic in its application context. The most important requirement of a real-time system is consistent output, not high throughput. Some kinds of software, such as many chess-playing programs , can fall into either category.

For instance, a chess program designed to play in a tournament with a clock will need to decide on a move before a certain deadline or lose the game, and is therefore a real-time computation, but a chess program that is allowed to run indefinitely before moving is not.

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In both of these cases, however, high performance is desirable: the more work a tournament chess program can do in the allotted time, the better its moves will be, and the faster an unconstrained chess program runs, the sooner it will be able to move. This example also illustrates the essential difference between real-time computations and other computations: if the tournament chess program does not make a decision about its next move in its allotted time it loses the game—i.

High-performance is indicative of the amount of processing that is performed in a given amount of time, whereas real-time is the ability to get done with the processing to yield a useful output in the available time. The term "near real-time" or "nearly real-time" NRT , in telecommunications and computing , refers to the time delay introduced, by automated data processing or network transmission, between the occurrence of an event and the use of the processed data, such as for display or feedback and control purposes.


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For example, a near-real-time display depicts an event or situation as it existed at the current time minus the processing time, as nearly the time of the live event. The distinction between the terms "near real time" and "real time" is somewhat nebulous and must be defined for the situation at hand. The term implies that there are no significant delays.

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Development of the Real-time Embedded Systems Lab

Near real-time also refers to delayed real-time transmission of voice and video. It allows playing video images, in approximately real-time, without having to wait for an entire large video file to download.

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The distinction between "near real-time" and "real-time" varies, and the delay is dependent on the type and speed of the transmission. The delay in near real-time is typically of the order of several seconds to several minutes. Several methods exist to aid the design of real-time systems, an example of which is MASCOT , an old but very successful method which represents the concurrent structure of the system.

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Autonomous peripheral operation DSOS Processing modes Ptolemy Project Real-time computer graphics Real-time testing Scheduling analysis real-time systems Synchronous programming language Time-utility function Worst-case execution time. Programming Real-time Computer Systems. Computer-Based Industrial Control. PHI Learning.

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Future Generation Computer Systems. Kuo, B. Lee, and W. Section 1.

Introduction to Real-Time Embedded Systems

July Computer science. Computer architecture Embedded system Real-time computing Dependability. Network architecture Network protocol Network components Network scheduler Network performance evaluation Network service. Interpreter Middleware Virtual machine Operating system Software quality.