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AES Journal Forum: Comment by Scott Dorsey on "Is High-Frequency Intermodulation Distortion a Significant Factor in High-Resolution Audio?"

Title: Is High-Frequency Intermodulation Distortion a Significant Factor in High-Resolution Audio?
JAES Volume 67 Issue 5 pp. 310-318; May 2019
Comment by: Scott Dorsey

This is an interesting paper and a good step toward establishing the lack of harm of wide-bandwidth reproduction.  The authors play back ultrasonic measurement signals through loudspeakers designed for wide-bandwidth reproduction and the resulting heterodyne products in the audible range seem not to be a problem.

However, it would be interesting to hear if results would be similar using speakers not designed for wide-bandwidth reproduction.  Perhaps the lack of ultrasonic response would reduce the audible heterodyne products still farther.  On the other hand, perhaps great ultrasonic nonlinearity would make them more severe.


Posted on May 13, 2021 at 4:01:18 PM EDT



AES Journal Forum: Comment by Fernando Vargas on "Preventing Hearing Loss"

Title: Preventing Hearing Loss
JAES Volume 54 Issue 11 pp. 1109-1113; November 2006
Comment by: Fernando Vargas

Questions:

 
-Why do we hear a "whistle" while using ear plugs in a quiet place? For example: being in bed at night with ear plugs, produce a "whistle"?
 
-What is it the correct form of usin ear plugs, "all the way in" or "half way in" of our ears?
 
Hopefully I'm clear enough to formulate my questions, and if there is not an answer, I'm here to help out to find it out.
 
Kind regards.
 
Fernando Vargas

Posted on May 3, 2021 at 6:25:00 AM EDT



AES Journal Forum: Comment by Francesco Balena on "Enhanced Temporal Feature Integration in Audio Semantics via Alpha-Stable Modeling"

Title: Enhanced Temporal Feature Integration in Audio Semantics via Alpha-Stable Modeling
JAES Volume 69 Issue 4 pp. 227-237; April 2021
Comment by: Francesco Balena

I had completely misunderstood the content of thie article. I was thinking about the MOSFET thresholds....It is welcome to address the problem of gender equality also in audio. But as with gender disparities in other fields, what matters is competence. The male-dominated obstacles to female competence must be severely fought. After that it is only a cultural question in female's choices. Francesco Balena


Posted on April 29, 2021 at 3:53:54 PM EDT



AES Journal Forum: Comment by Scott Dorsey on "A Variable Inductor"

Title: A Variable Inductor
JAES Volume 1 Issue 3 pp. 262-264; July 1953
Comment by: Scott Dorsey

Ingenious idea: a high value ferrite-core inductor that can be moved into saturation by a permanent magnet to reduce the value of inductance.  This acts like a magnetic amplifier but with the control flux provided mechanically rather than electronically.

I am skeptical of the author's claim of 1% distortion at 100mw... it would seem to me that any tiny asymmetry of the core would be magnified as the bias flux is increased and that even harmonic distortion would be a real problem.

It does not look as if this design thread was ever carried on any farther, unfortunately.  It's an interesting design and might have been useful for many things in the days before tunable state-variable filters became available.


Posted on January 28, 2021 at 4:41:33 PM EST



AES Journal Forum: Comment by Scott Dorsey on "Soft Magnetic Materials for Audio Transformers: History, Production, and Applications"

Title: Soft Magnetic Materials for Audio Transformers: History, Production, and Applications
JAES Volume 35 Issue 10 pp. 760-777; October 1987
Comment by: Scott Dorsey

This sort of paper would never be published in the journal today, sadly.  This is Dr. Sowter's basic overview of the history of audio transformers with some interesting notes about audio transformer design.  It's almost a stream of consciousness sort of piece.  It is by no means complete or authoritative, but it is a great overview for someone who wants basic background on audio transformer design and application.


Posted on August 14, 2020 at 6:32:36 PM EDT


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