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Parametron

Parametron 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 Parametron rather than just read about it. In short: The parametron is a logic circuit element invented by Eiichi Goto in 1954. The parametron is essentially a resonant circuit with a nonlinear reactive element which oscillates at half the driving frequency.

Parametron — main illustration
Parametron — illustration

Key takeaways

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

Reference excerpt

The parametron is a logic circuit element invented by Eiichi Goto in 1954. The parametron is essentially a resonant circuit with a nonlinear reactive element which oscillates at half the driving frequency. The oscillation can be made to represent a binary digit by the choice between two stationary phases π radians (180 degrees) apart. Parametrons were used in early Japanese computers from 1954 through the early 1960s. A prototype parametron-based computer, the PC-1, was built at the University of Tokyo in 1958 and later recognized as part of the IEEE Milestone for the parametron. Parametrons were used in early Japanese computers due to being reliable and inexpensive but were ultimately surpassed by transistors due to differences in speed.

See also Quantum flux parametron – Digital logic implementation technology based on superconducting Josephson junctions Eiichi Goto – Japanese computer scientist MUSASINO-1 – Early electronic digital computer built in Japan Magnetic amplifier – Electromagnetic device Magnetic logic – Digital logic based on non-linear magnetic effects Parametric oscillator – Harmonic oscillator whose parameters oscillate in time

References

Illustrations

Parametron: A Fujitsu FACOM 201 parametron computer in the Science Museum of the Tokyo University of Science
A Fujitsu FACOM 201 parametron computer in the Science Museum of the Tokyo University of Science

Worked examples

Example 1 — a first encounter with Parametron

Start with the simplest possible case. Write down what Parametron 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 Parametron 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 Parametron 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 Parametron

In research
Parametron 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 Parametron 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
Parametron is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer hardware stubs, Digital electronics, Magnetic devices, so understanding it makes those chapters shorter.
In everyday life
Look for Parametron 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 Parametron in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Parametron 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 Parametron out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Parametron in simple terms?

The parametron is a logic circuit element invented by Eiichi Goto in 1954. The parametron is essentially a resonant circuit with a nonlinear reactive element which oscillates at half the driving frequency.

Why does Parametron 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 Parametron?

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 Parametron.

Tags

  • Computer hardware stubs
  • Digital electronics
  • Magnetic devices
  • Magnetic logic computers

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