Stereophonic Earphones and Binaural Loudspeakers
Stereophonic sound is recorded for reproduction over spaced-apart loudspeakers. When earphones are substituted for loudspeakers the stereophonic space perspective is incorrectly portrayed. This paper describes two electrical networks which allow earphones to ube used in place of loudspeakers without substantial loss of space perspective. One of them is designed to work from low impedance sources and feed into high impedance earphones. The second, which is a dual of the first, is more suited to medium impedance sources and low impedance earphones. It is pointed out that these networks can also be used to convert a binaural program for reproduction over a stereophonic loudspeaker system. This is done by reversing the phase of one amplifier channel and of the corresponding loudspeaker.
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