Rise Above the Jet Noise
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Transcript of Rise Above the Jet Noise
Technology Committee Meeting | 19-20 January 2005 | Glendale, CA 1
Rise Above the Jet Noise
AVX Adaptive Encoding
Jeremy Hoenack,CAS, MPSE
Sound Trax Studios
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AVX Inflight Sound Overview 1
• Subtle dialog is clear and easy to understand
• Underscore and background effects that are normally lost are crisp and clear
• Film sound-track masks jet noise instead of reverse
• No high sound levels, no ear pain, no need to constantly adjust volume, natural sounding
• More immersion in film – more positive flight experience
• No new equipment – compatible with all IFE systems
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AVX Inflight Sound Overview 2
• Psycho-acoustic adaptive encoding • Parses, disassembles, restructures the dynamic range in
real time – constantly adapts to program content
• Enables full optimization of dynamic range to needs of human hearing without severe limitations of existing technology
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AVX Inflight Sound Overview 3
• Adaptive Encoder vs. Compressor/Limiter
• DSP intensive vs. analog design
• Unlimited design possibilities vs. practical limitations• AVX “reverse-compression” emulates how brain deals
with high ambient noise like conversation on a jet
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IFE sound system – The Titanic
• Destined to cruise over sea of noise – 75db SPL (From take-off to landing, like sitting next to a vacuum cleaner, a hair dryer, or standing in the shower.)
• Can not change course very quickly – prohibitive costs• Needs to accommodate all kinds of people and stuff –
variety of headphones, hardware, media
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Film sound track – The Iceberg
• Only the peaks are noticed
• Most of it obscured by sea of noise• “Big picture” missing – no context• Tells how to perceive visual (picture)• Controls emotional response eg. fear• Conveying the emotional content is
life or death matter to a film• Low emotion = low immersion
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How much is hidden?• Top of iceberg is 90db• 15db is revealed
• Sea of noise level 75db
• 35db obscured by sea of noise
• Over 2/3 of sound (dynamic range) is buried beneath sea of noise
• Bottom of iceberg is >40db
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Human hearing 1
• Normal range 35-72db for speech (intelligibility)
• Below 75db sea of noise in cabin
• = 0% intelligibility• Good news - No need to have
foreign language tracks
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Human hearing 2
• Lose intelligibility if average speech less than 15 db above noise – 75 + 15 = 90db
• Narrow range for speech 15 db – average at 90db (unsafe), peaks at 97db
• Bad news - Above 85db – no increase in intelligibility – instead oppression and discomfort
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How to uncover the iceberg?
• Can not change noise level - 75db
• Iceberg is 50db high (dynamic range) 90db-40db
• Can not lift above noise level 5db+75db=125db !!!!!
• 90db beginning of “unsafe levels” (D.O.L.), discomfort
• 2 hours @ 100db = hearing damage – long flights?
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painpainear damageear damage ear damage“unsafe”“unsafe”discomfort
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Existing technology ineffective 1
• Squeezes to 30-40db range– Ear discomfort from peaks– Obscured mood fx / underscore– Straining to understand – low
intelligibility
• Jet noise “in front” of sound track
– Like looking through dirty glass
• Constant volume adjustments
• Little or no immersion in film
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Existing technology ineffective 2
• Operates from top down – Characteristics of electronics– Compressor– Limiter
• Unnatural
– Real life is opposite
• Limited by artifact -claustrophobic
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Human hearing psychology 1
• Decoding, decoding, decoding – Sound into phonemes– Phonemes into words– Words into language– Language into meaning
• Brain overwhelmed– Sound buried in noise– Playing “catch-up” -Trying to figure out
what was missed while trying to continue in-the-moment decoding
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Human hearing psychology 2
• Failure & frustration– No one likes to feel stupid
– Not knowing “what’s going on”
– Missing vital information that “others know”
• Ability to make emotional associations is blocked by obsession to decode
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Brainy brain has no problem
• Why we can have a normal conversation above the noise?
• Brain uses “reverse-compression” to raise bottom with little affect on top
• High intelligibility with acceptable levels
• Normal speech pattern -subconsciously adapt to ambient noise
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AVX one-ups the brain 1
• Extreme reverse-compress/limitmicro-encodes detail
• Top is normal – ‘must be normal’
• Comfortable levels
• Dynamic range fits
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AVX one-ups the brain 2
• Raises bottom of sound track above noise
• Mask effect – sound track is relentlessly dominant
• Mind tunes out and soon forgets subordinate jet noise (it wants to)
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AVX one-ups the brain 3
• Enhanced aural cues ~100% intelligibility including spatial cues
• Sound decoding easy & relaxing
• Brain resources free to make deep emotional associations
• High level of immersion in film
• Tune out flying – trip is shorter and more enjoyable
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• Clips mixed with jet noise @~73db for simulation
• All clips are at the same volume level
• Louder sounds are similar• AVX raises quiet sounds
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Film Clips from SECONDHAND LIONS comparing
WAEA 1289-1 spec. audio with AVX encoded audio
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Per 1289-1 spec. #1
Inaudible under bridge, cop, plane approach
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AVX Encoded #1
Distinct snoring & ambience under bridge, plane
approach
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Per 1289-1 spec. #2
Inaudible off camera speech, music and ambience
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AVX Encoded #2
Speech is intelligible, distinct music and
ambience
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Per 1289-1 spec. #3
Inaudible lion growls, weak ambience, lack of presence
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AVX Encoded #3
Distinct lion growls, ambience is dominant,
speech has good presence
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Per 1289-1 spec. #4
Inaudible bell-tree, no presence to music and ambience
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AVX Encoded #4
Distinct bell-tree, good presence of music and
ambience
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Per 1289-1 spec. #5
Inaudible ambience, unclear speech at end
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AVX Encoded #5
Better ambience, distinct speech at end “learn to do
without” & “uh-huh”
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Per 1289-1 spec. #6
Speech is frustrating - unclear, music missing until end
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AVX Encoded #6
Speech is intelligible, music is marginally audible
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Per 1289-1 spec. #7
Speech is marginal, jet noise dominates
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AVX Encoded #7
Speech is crisp and present, music and ambience
dominate over jet noise
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Per 1289-1 spec. #8
Jet noise dominates, missing/obscure lion sound,
ambience very weak
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AVX Encoded #8
Sound track dominates,lion & ambience clear,
presence, “in the movie”
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Per 1289-1 spec. #9
Jet noise dominates, speech lacks presence,
ambience very weak
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AVX Encoded #9
Track dominates, speech is intimate & clear, ambience, reverb, presence, “in the movie”
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Summary
• AVX solves the difficult noise problem for IFE films
• Film perceived as intended
• High immersion > enjoyment > successful distraction
• Greater satisfaction & positive impression of flight
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AVX turns the iceberg into a
breeze, giving IFE
a free ride
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AVX 757 Simulator Demo
• 5-8 after show, 10 minute drive west near Disney & Warner Bros.
• Sound Trax Studios2815 West Burbank Blvd.Burbank 818-842-6300
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AVX would like to thank
• WAEA attendees
• John Salzman
• John Eargle & Chris Foreman –sound reinforcement research
• Avid Airline Products – headphones
• Sound Trax Studios
• New Line Cinema
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