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jjjjjooooo

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(https://twit.tv/shows/home-theater-geeks/episodes/1).

Holman has done “audio direction” for Apple since 2011. Which was the year Apple “started to create a centralized and expanded audio and acoustics team” (https://www.forbes.com/sites/davidp...es-homepod-secrets-release-date/#30d11e224d6a).

HomePod project began around 2012.

He was listed as the inventor on a patent Apple filed Sep 13, 2014 for “Directivity optimized sound reproduction” (https://www.google.com/patents/US20170105084). (Which has apparently been referenced 11 times in subsequent patent filings by Sonos (https://www.google.com/patents/US20170105084#forward-citations). Who released their Trueplay calibration system in 2015.)

Discussed here after it was published (http://www.patentlyapple.com/patent...und-system-invents-next-gen-audio-system.html).

Also, posted here (https://forums.macrumors.com/thread...alogue-from-movies-more-intelligible.2105702/) by me.

He created THX sound (manual room corrrection—I think) for movie theaters while working at Lucasfilm. (Says “THX” stands for “Tomlinson Holman crossover,” THX 1138 a fortuitous coincidence.)

He says he came up with the term “5.1.”

He cofounded Audyssey Laboratories, which makes the audio calibration technology (https://en.wikipedia.org/wiki/Audyssey_Laboratories#Technologies) that powers The Wirecutter’s current pick for AV receiver (https://thewirecutter.com/reviews/best-receiver/), in 2002. (Also, be sure to check out the eVR far field voice technology they’re advertising on their website (https://audyssey.com).)

He was an advocate for left and right front height channels (popularized by Dolby as “Dolby Atmos” in 2012). And possibly using two subwoofers (one for each octave, 20-40 and 40-80Hz—I think).

Toward the end of the podcast he talks about incorporating psychoacoustics into audio designs with digital signal processing. The “r/audiophile” review of HomePod by “u/WinterCharm” says Apple is using “Fletcher–Munson curves,” (a psychoacoustic finding of loudness perception) as part of its calibration process (https://www.reddit.com/r/audiophile/comments/7wwtqy/_/du4rp5j/?context=1).
 
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jjjjjooooo

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“Audio’s Circle of Confusion” (http://seanolive.blogspot.com/2009/10/?m=1).

For example, a recording that is too bright can make a dull loudspeaker sound good, and an accurate loudspeaker sound too bright [5]. A review of the scientific literature on loudspeaker listening tests indicates that recordings are a serious nuisance variable that need to be carefully selected and controlled in the experimental design and analysis of test results.

Came across this article, also from 2009, from Sean Olive, an “Acoustics Research Fellow” at Harman International (now a division of Samsung).
 
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