In 1972 Dolby Laboratories investigated techniques for measuring noise in professional and consumer audio equipment. A method giving agreement with subjective assessments was needed for use within the company and for exchanging information with outside organizations such as licensees. The study revealed that existing methods were unsatisfactory but that the use of the CCIR weighting characteristic with unity gain at 2 kHz in conjunction with an average responding meter (ordinary millivoltmeter) gave appropriate results. Practical details, circuitry, and applications are discussed.
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https://aes2.org/publications/elibrary-page/?id=3218
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