A sound demonstration can retain a recognisable pitch after a particular frequency component is removed. A graphic that adds the missing component back into the spectrum to match what the audience hears would erase the point of the demonstration. The production must distinguish the physical components shown from the perceptual description being discussed.
MIT's missing-fundamental demonstration illustrates that a musical pitch can be heard when the fundamental component of a harmonic series is absent. Keep the claim qualified: the demonstration supports a distinction between spectral content and perceived pitch, not a promise that every listener, stimulus and playback arrangement produces an identical experience.
Give the spectrum and the listening response different roles
A spectral display should show the components actually included in the approved example. A separate label can describe the perceptual idea. Do not use one moving marker to represent both a measured component and a listener's pitch judgement.
If the graphic is schematic rather than an instrument capture, say so. The technical owner should supply the component set and check the final sound. A designer should not choose an attractive series of bars and ask the sound editor to make something that vaguely resembles it.
Avoid suggesting that the missing component has returned
A dotted guide at the fundamental's position can be helpful if its role is explicit. It should not look like an ordinary measured bar. Similarly, a glowing note symbol may describe an intended perceptual relationship, but it must not appear to be evidence that a physical component has reappeared in the signal.
The lesson does not require an explanation of every theory of hearing. A brief film can keep the distinction narrow and leave specialist perceptual interpretation with the subject expert.
A hypothetical audio education film
An invented technical education provider commissions a comparison for a music technology course. The first storyboard removes a low-frequency bar and then fades it back in when the narrator says the pitch may remain recognisable. The animation implies that the component was restored to the sound.
The reviewer keeps the absent component visibly absent and places the perceptual description in a separate panel. The approved audio and the diagram are checked together. The team uses a prepared demonstration rather than suggesting that an arbitrary online playback result is a hearing assessment.
The course also supplies a written explanation of the relationship so that understanding the lesson does not depend entirely on hearing the example through a particular device.
Review what the bars claim
Ask a viewer whether the fundamental component is present in the illustrated signal. Then ask what the separate pitch label describes. If the answers collapse into one statement, revise the visual distinction.
Discuss the sound-concept graphic with Live Images and provide an expert-approved demonstration. The useful insight is that perception and a spectrum are related but are not the same display, not that an absent bar should be painted back in for convenience.
Prepared with AI assistance for Live Images. Planning guidance is general; suitability and production scope must be agreed for your project.