Speech and Hearing in Communication.

Physics of sound, as applied to speech and hearing, was advanced considerably by the publication of the first edition of "Speech and Hearing" in 1929. Written by a physicist who had devoted 15 years to research in the transmission of sound at the Bell Telephone Company laboratories, the book proved to be an authoritative source of information on acoustics and one on which much of the later research in communications was based. This new book of the same name, based on the author's earlier work, contains the most recent information on acoustics. The author discusses the physics of the speaking and hearing mechanisms of the human being. The fundamentals of acoustics and methods of calculating articulation scores are also presented. A new method for the calculation of perception of speech and a method for computing per cent hearing loss are proposed. The book deals extensively with the mathematical approach to