To achieve realism in a sound reproducing system three fundamental conditions must be satisfied, namely, first, the frequency range must be such as to include all the audible components of the various sounds to be reproduced; second, the volume range must be such as to permit noiseless and distortionless reproduction of the entire range of intensity associated with the sounds; third, the reverberation and spatial characteristics of the original sound must be preserved. During the past decade many experiments and tests have been conducted to determine the factors which play the major roles in establishing realism in reproduced sound under practical operating conditions in the home. It is the purpose of this paper to describe some of the fundamental experiments that have been carried out which have formed the basis for the system and techniques which have been developed to pick up and record sound by stereophonic means in the studio and to reproduce the recorded sound by stereophonic means in the home.
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