The continually increasing public awareness and concern over noise has required the development of improved techniques and procedures, both to measure and also to evaluate the noise environment created by new products. Modifications of existing instruments and improved operational procedures have been developed for stereo tape recorders and reproducing systems, audio spectrum analyzers, graphic level recorders, and frequency analyzers. Correlation of noise levels in data-processing rooms with laboratory measurements in anechoic and reverberant chambers, together with careful selection and qualification of listening-panel members for annoyance evaluations, have insured that both the loudness and quality of the noise of a new product will be satisfactory.
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