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Cabinet/Holophonics

LLM Wiki article / 1 minute read

Binaural Recording

Binaural recording is the established technique of capturing sound in a way that reproduces the spatial cues a listener would receive at their two ears. In the source dossier on Holophonics, binaural recording is named as the technique that actually explains the perceptual effects attributed to Holophonics.

Mechanism as described in the source

The dossier states that Holophonics, "like binaural recording, instead reproduces the interaural differences (arrival time and amplitude between the ears), as well as rudimentary head-related transfer functions (HRTF). These create the illusion that sounds produced in the membrane of a speaker emanate from specific directions."

The two cue families named are:

  • Interaural time differences (ITD) — the difference in arrival time of a sound between the two ears.
  • Interaural level differences (ILD) — the difference in amplitude between the two ears.

Together with Head-Related Transfer Function (HRTF) cues, these are described as adequate to reproduce realistic spatial recordings comparable to real listening, and comparable to the Holophonics demonstrations.

Relation to Holophonics

The dossier's Wikipedia-derived text draws a direct equivalence: Holophonics is a binaural recording system, and the spatial illusion it produces is explained by the same interaural and HRTF cues that binaural recording reproduces. This is the basis for the source's negative assessment of the Auditory Interferometer Hypothesis — the demonstrations work, but the proposed mechanism is unnecessary.

Physical implementation

The head-shaped microphone described in US4680856 — Process for Forming an Acoustic Monitoring Device and EP0050100 — Device for the Spatial Codification of Sounds is a physical binaural capture device: it reproduces the auricles, auditory meatus, Eustachian tubes and oral cavity, and places microphones or membranes at the eardrum position and orientation. The EP0050100 wig is an explicit design element that "provides asymmetry for front and back discrimination."

Source notes & attribution
  1. Rex Research dossier: https://rexresearch.com/ZuccarelliHolophonics/ZuccarelliHolophonics.html
  2. Gilkey & Anderson, Binaural and Spatial Hearing in Real and Virtual Environments .
  3. https://rexresearch.com/ZuccarelliHolophonics/ZuccarelliHolophonics.html

Dossier visual record.

All 1 figures

Source illustrations for Holophonics. Captions identify the document and evidence type.

Articles that refer to this reading
Article
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Auditory Interferometer Hypothesis

The auditory interferometer hypothesis is the theoretical claim that Hugo Zuccarelli attached to Holophonics . It holds that the human auditory system acts as an interferometer: the ear emits a reference sound that combines with incoming sound to form an interference pattern inside the ear, whose nature is sensitive to the direc

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Head-Related Transfer Function (HRTF)

A head-related transfer function (HRTF) describes how the anatomy of the head, pinnae and torso filters incoming sound before it reaches the eardrum, as a function of the direction of the sound source. In the source dossier on Holophonics , HRTF synthesis is named as one of the mechanisms that adequately explains spatial-audio r

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Holophonics

Holophonics is a binaural recording and reproduction system created by the Argentine inventor Hugo Zuccarelli in 1980, during his studies at the Politecnico di Milano. The source dossier describes it as "a binaural recording system ... based on the claim that the human auditory system acts as an interferometer." It relies on pha

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Holophonics Claims vs. Evidence: The Interferometer Theory, the Demonstrations and the Binaural Explanation

This comparison sets the claims made for Holophonics against the evidence the source dossier itself supplies. The dossier is unusual in that its own Wikipedia-derived text carries the counter-evidence, so the comparison is largely internal to the source.

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Hugo Zuccarelli and Holophonics

This source dossier collects material about Holophonics , a binaural recording and reproduction system created by the Argentine inventor Hugo Zuccarelli in 1980 while he was studying at the Politecnico di Milano. The page is an aggregation rather than a study: it combines a Wikipedia-derived summary of Holophonics, abstracts of

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Otoacoustic Emissions

Otoacoustic emissions are sounds produced by the inner ear — the ear does emit sound. In the source dossier on Holophonics , otoacoustic emissions serve as the pivot between a real phenomenon and an unsupported extension of it.

Keep following.

Thematic connections, not evidence of a shared mechanism