From the original work of Hopkins-Stryker in 1948, through its development by Beranek in 1949, and its use by Davis in 1968 and Boner in 1969 in acoustic gain calculations, the Hopkins-Stryker equation has proven highly useful to a myriad of users. In recent years this versatile tool has been modified in the light of measurements by Peutz and Davis to account for multiple sources, semi-reverberant spaces, modifiers of critical distance, and various electroacoustic modifiers of the ratio of direct-to-reverberant sound. This paper is a thorough discussion of these modifications and their proper application in acoustic calculations.
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