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Voice Funnel

Voice Funnel 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 Voice Funnel rather than just read about it. In short: The Voice Funnel was an experimental high-speed interface between digitized speech streams and a packet switching communications network, in particular the ARPANET. It was built in the time frame from 1979 to 1981.

Key takeaways

  • Voice Funnel 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 Voice Funnel to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Voice Funnel from memory before moving on to harder problems.

Reference excerpt

The Voice Funnel was an experimental high-speed interface between digitized speech streams and a packet switching communications network, in particular the ARPANET. It was built in the time frame from 1979 to 1981. It may be viewed as an early Voice over IP voice and video telephone. The Voice Funnel was designed and built by Bolt, Beranek and Newman. During the 1980s, it was used for audio and video conferences across the ARPANET, and later evolved into the multi-processor BBN Butterfly computer.

See also Network Voice Protocol

References Rettberg, R., C. Wyman, D. Hunt, M. Hoffman, P. Carvey, B. Hyde, W. Clark and M. Kraley. Development of a Voice Funnel System: Design Report, Bolt, Beranek and Newman, Report No. 4098, August 1979.

Worked examples

Example 1 — a first encounter with Voice Funnel

Start with the simplest possible case. Write down what Voice Funnel 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 Voice Funnel 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 Voice Funnel 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 Voice Funnel

In research
Voice Funnel 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 Voice Funnel 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
Voice Funnel is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer network stubs, VoIP hardware, Voice over IP, so understanding it makes those chapters shorter.
In everyday life
Look for Voice Funnel 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 Voice Funnel in 20 minutes

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

Frequently asked questions

What is Voice Funnel in simple terms?

The Voice Funnel was an experimental high-speed interface between digitized speech streams and a packet switching communications network, in particular the ARPANET. It was built in the time frame from 1979 to 1981.

Why does Voice Funnel 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 Voice Funnel?

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 Voice Funnel.

Tags

  • Computer network stubs
  • VoIP hardware
  • Voice over IP

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