science

Harmonically enhanced digital audio

Harmonically enhanced digital audio is a 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 Harmonically enhanced digital audio rather than just read about it. In short: Harmonically Enhanced Digital Audio (HEDA) is a class of digital recordings created by using modern digital harmonic enhancement technology. With the proliferation of harmonic enhancement algorithms, pioneered by Crane Song's Dave Hill, a new class of harmonic enhancement algorithms have emerged.

Key takeaways

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

Reference excerpt

Harmonically Enhanced Digital Audio (HEDA) is a class of digital recordings created by using modern digital harmonic enhancement technology. With the proliferation of harmonic enhancement algorithms, pioneered by Crane Song's Dave Hill, a new class of harmonic enhancement algorithms have emerged. Examples of algorithms used to create HEDA include the HEAT feature (available on Pro Tools HD 8.1 and later) and the multi-platform plug-ins Universal Audio's Studer A800, Slate Digital's Virtual Console Collection, Waves Non-Linear Summer, and Crane Song HEDD-192.

History Development of harmonic enhancement was in its first stages in 1999 when Antares, developer of Autotune, noticed that the tube emulation feature in its microphone simulator was used more than its other features. In response, Antares created a specific plug-in, called Antares Tube, which implemented tube emulation. The algorithms for harmonic enhancement were just beginning and market interest was shown to be present. During its development period, harmonic exciters and harmonic enhancement plug-ins were looked down upon by most of the pro-audio industry.

Modern Harmonic Enhancement HEAT (Harmonic Enhancement Algorithm Technology), released in 2010, is a plug-in featured on each track of HD editions of Pro Tools. Avid, developer of Pro Tools, enlisted the help of Dave Hill of Crane Song for its creation. Dave Hill's harmonic enhancement algorithms have been viewed as top-of-the-line by many professionals for years. Before Pro Tools 8.1, no Digital Audio Workstation (DAW) featured harmonic enhancement on each track. Alternatives available on other platforms are Universal Audio's Studer A800 plug-in (released in late 2010), Slate Digital's Virtual Console Collection (VCC), Sonimus Satson, and Waves' Non-Linear Summer (NLS).

References

External links HEDA

Worked examples

Example 1 — a first encounter with Harmonically enhanced digital audio

Start with the simplest possible case. Write down what Harmonically enhanced digital audio claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In 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 Harmonically enhanced digital audio 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 Harmonically enhanced digital audio 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 Harmonically enhanced digital audio

In research: Harmonically enhanced digital audio appears in 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 Harmonically enhanced digital audio 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: Harmonically enhanced digital audio is common in secondary-school and first-year university syllabi. It links to neighbouring topics Audio electronics, so understanding it makes those chapters shorter.
In everyday life: Look for Harmonically enhanced digital audio 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 Harmonically enhanced digital audio in 20 minutes

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

Frequently asked questions

What is Harmonically enhanced digital audio in simple terms?

Why does Harmonically enhanced digital audio matter?

Because it connects several 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 Harmonically enhanced digital audio?

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 Harmonically enhanced digital audio.