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copied!<p>I'm curious for feedback myself on this. Real-time and batch are well defined and covered by others (though be warned that they are terms-of-art with very specific technical meanings in some contexts). However, "near real-time" seems a lot fuzzier to me.</p> <p>I favor (and have been using) "near real-time" to describe a signal-processing system which can 'keep up' on average, but lags sometimes. Think of a system processing events which only happen sporadically... Assuming it has sufficient buffering capacity and the time it takes to process an event is less than the average time between events, it can keep up.</p> <p>In a signal processing context: - Real-time seems to imply a system where processing is guaranteed to complete with a specified (short) delay after the signal has been received. A minimal buffer is needed. - Near real-time (as I have been using it) means a system where the delay between receiving and completion of processing may get relatively large on occasion, but the system will not (except under pathological conditions) fall behind so far that the buffer gets filled up. - Batch implies post-processing to me. The incoming signal is just saved (maybe with a bit of real-time pre-processing) and then analyzed later.</p> <p>This gives the nice framework of real-time and near real-time being systems where they can (in theory) run forever while new data is being acquired... processing happens in parallel with acquisition. Batch processing happens after all the data has been collected.</p> <p>Anyway, I could be conflicting with some technical definitions I'm unaware of... and I assume someone here will gleefully correct me if needed.</p>

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