I finally got around to trying a recommendation of MDB to lift some of my ignorance about hearing, the text Introduction to Audiology by Martin and Clark, 13th edition, 2019. The price of texts these days had been putting me off but I opted for the Pearson eText, which if bought on Amazon is delivered as an Amazon Kindle book readable on PC’s, iOS and Android devices, but not Kindle Readers! Hopefully, buying it through Amazon assures that the text will survive electronically for a good while to come. The Amazon PC Kindle interface is much improved but I have yet to see how the interactive features of this particular electronic book play in the Kindle app.
I found one particular striking passage early on the psychoacoustics of sound perception: how fundamental tones of low frequency combine to produce higher frequency harmonics which may vary in strength depending of the number, frequency, and amplitude of the base fundamental frequencies. But here is a striking quote from the book that relates that to the way standard telephones work relative to the fundamental frequencies of adult male and female human voices:
Once the harmonic structure of a wave has been determined by the fundamental, the fundamental is no longer critical for the clear perception of a sound for persons with normal hearing. This is exemplified by the telephone, which does not allow frequencies below about 300 Hz to pass through. Although a man’s fundamental vocal frequency averages about 85 to 150 Hz and a woman’s about 175 to 250 Hz (both the consequences of laryngeal size, shape, and subglottal pressure), the sex of the speakers, as well as their identities, is often evident over a telephone even though the fundamental frequency is filtered out.
Martin, Frederick N… Introduction to Audiology (Pearson Communication Sciences and Disorders) (p. 27). Pearson Education. Kindle Edition.
Just to see if I was needless duplicating previous discussion of such on the forum I searched about and the closest thing that I could come up with was the following from 2007:
Another interesting tidbit gleaned from early on in the book is the eardrum-shattering blast of a gunshot is not from the powder explosion but rather the sonic boom of the bullet exiting the gun barrel at supersonic speed.
So far have read only up to about page 30 of a 524 page book but glad I plunked down the cash for the book. Good read so far. Good on the history of audiology as a profession in the U.S., which began in the military after WWII attending to the many WWII veterans with hearing loss.