Noise Level and Mechanical Stresses in Plastic Sound Records
Ernest A. Keller · The Journal of the Acoustical Society of America · 1954
Residual mechanical stresses in press-polished plastic film material used for the embossing type sound recording are in many cases responsible for relatively high noise levels. Results of noise measurements of different plastic materials on a 400 grooves per inch recorder are presented. The relation between optically observed stresses and recorded noise level is given. Practical consequences are discussed.