computer science

Network video recorder

Network video recorder is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Network video recorder rather than just read about it. In short: A network video recorder (NVR) is a specialized computer system that records video to a disk drive, USB flash drive, memory card, or other mass storage device. An NVR itself contains no cameras, but connects to them through a network, typically as part of an IP video surveillance system.

Key takeaways

Network video recorder belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Network video recorder to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Network video recorder from memory before moving on to harder problems.

Reference excerpt

A network video recorder (NVR) is a specialized computer system that records video to a disk drive, USB flash drive, memory card, or other mass storage device. An NVR itself contains no cameras, but connects to them through a network, typically as part of an IP video surveillance system. NVRs typically have embedded operating systems. As a more flexible and serviceable alternative to NVRs, ordinary computers may be equipped with video management software (VMS). NVRs differ from digital video recorders (DVRs), as an NVR's input is from a network rather than a direct connection to a video capture card or tuner. Video on a DVR is encoded and processed at the DVR, while video on an NVR is encoded and processed at the camera, then streamed to the NVR for storage or remote viewing. Additional processing may be done at the NVR, such as further compression or tagging with metadata. Hybrid NVR/DVR surveillance systems exist which incorporate functions of both NVR and DVR.

See also Video management system Closed-circuit television (CCTV) Closed-circuit television camera Digital video recorder (DVR) List of free television software ZoneMinder, a free closed-circuit television software application

References

Illustrations

Worked examples

Example 1 — a first encounter with Network video recorder

Start with the simplest possible case. Write down what Network video recorder claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Network video recorder before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Network video recorder ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Network video recorder

In research: Network video recorder appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Network video recorder in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Network video recorder is common in secondary-school and first-year university syllabi. It links to neighbouring topics Digital video recorders, Video hardware, Video surveillance, so understanding it makes those chapters shorter.
In everyday life: Look for Network video recorder outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Network video recorder in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Network video recorder means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Network video recorder out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Network video recorder in simple terms?

Why does Network video recorder matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Network video recorder?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Network video recorder.