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Copyright Notice

All of JJ's Powerpoint decks are copyright © by JJ Johnston. All rights reserved.
Permission granted for your own personal (educational) use. This copyright applies whether stated within the deck or not.

Most Recent

These are the meeting reports for the January 2022, January 2021 meeting, and the April 2019 meeting, which are meant as a series. Whatever media exists will be found there. (audio, video, ppt, zoom, etc.)

January 2022 meeting, Masking. Access to files used/needed. Meeting report to follow, with meeting recording, etc.

January 2021 meeting, Auditory Mechanisms for Spatial Hearing

April 2019 Meeting, Hearing 096/099

Octave files

lplt_t3.m Octave program (jan 2014 & feb 2015)

Heyser Lecture

From the 133rd AES Convention, October 2012, San Francisco.
1.2MB PPTx deck.
audio recording of meeting
Meeting report from meeting

Hearing & Psychoacoustics

Soundfields vs. Human Hearing Download (900k ppt)
Hearing Tutorial (131st AES, NYC, 2011) Download (2.6Mb pptx)
Download (2.8Mb ppt)
Fundamentals of Hearing Download (1.28Mb ppt)
Some possible sources of listener fatigue. Download (128kb ppt)
What can go wrong with loudness models Download (345kb ppt)
Care and Feeding of Loudness Models Download (127kb ppt)
A spatial hearing tutorial Download (842kb ppt)
A short essay on spatial hearing for the surround live conference. Download (181kb ppt)
Loudness Tutorial.
PNW Section meeting, April 2006

no sound (165k ppt)
with sound (8.2Mb ppt)
Session TS-1: Physics of Sound and Hearing (1.3Mb ppt)
A 2-hour hearing tutorial.
Download (1.3m ppt)
What Can We Hear? Download (770k ppt)
Why do we hear what we hear? Download (2Mb ppt)

Perceptual Coders and Related Hardware; Sample Rate Conversion

A Personal History of Perceptual Audio Coding Download (4.8Mb pptx)
What's inside a portable music player? Download (672kb ppt)
The history of audio codec research at AT&T Bell Labs and AT&T-Labs Research. Download (114kb ppt)
Perceptual Coding - A wide-ranging tutorial on perceptual audio coding (3 hours minimum) Download (4.9m ppt)
The Basic Theory of Filtering Download (779k ppt)
When to Code... WHEN NOT TO CODE Download (2Mb ppt)
Sampling Rate Conversion (Feb 2016) Download (1.6mb ppt)


Why do we hear what we hear? Download (250k ppt)
Spatial Perception of Audio vs. The Home Theatre Download (2.2Mb ppt)
JJ's vote for the 10 worst mistakes in audio engineering. Reprised from the 123rd Convention. Download (131kb ppt)
A Low-Complexity, Fast-acquiring Perceptually Tuned Room Correction Algorithm.
PNW Section meeting, January 2008

Download (409kb ppt)
The Science of Audio in 2004 (From the PNW Feb 2004 meeting, From Hear to Eternity.)
Download or View (1.1Mb PDF)
Conversion: Issues in Hearing, Sampling, Quantization and delta-sigma converter tutorial. Download (5.3Mb ppt)
Audio vs Video - the same or different? Highlights the differences between audio and video perception. Download (575k ppt)
Home Theatre vs Cinema Audio Production: the Technical Aspects Download (373k ppt)
Beyond MP3, Soundfield analysis, perception and capture or synthesis Download (2Mb ppt)

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Last modified 01/25/2022 22:51:6.