n.b. Chrome users need to refresh their browsers to ensure they have the latest content.
Meeting held Thursday, January 28, 2021 6:00pm PDT, on Zoom
The AES PNW Section presented a tutorial on the elements of human auditory mechanisms for spatial hearing for its January 2021 meeting on Zoom. AES Fellow and PNW Member James Johnston (JJ) gave this lecture, and approximately 74 persons attended (about 41 were AES members) from around the world.
JJ began with a review of what one ear can do, describing it as a frequency sensitive device, with filters and detectors. The hair cell structure and filtering action was described, leading to a discussion of the difference between loudness and intensity. Detector output was explained, as well as system non-linearities.
Next JJ spoke about how with two ears and the acoustics from the shape of the head, more things can be processed by the brain. Acoustics and direct sounds versus reflected sounds were detailed, as well as diffuse reflections and specular effects. He also went into reverberation effects and the Head-Related Transfer Function (HRTF). The Head Related Impulse Response (HRIR) is the time domain version of the HRTF. Distance perception and headphone problems were mentioned.
Many Q&As were fielded, and attendees were encouraged to stay on Zoom to introduce themselves.
In 2006, he received the James L. Flanagan Signal Processing Award from the IEEE Signal Processing Society, and presented the 2012 Heyser Lecture at the AES 133rd Convention: Audio, Radio, Acoustics and Signal Processing: the Way Forward. In 2020 he was a co-recipient of the IEEE Signal Processing Society Industrial Innovation Award with Karlheinz Brandenburg and Jürgen Herre, "for contributions to the standardization of audio coding technology."
Reported by Gary Louie, PNW Section Secretary