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experiment. Uncover the other ear and listen again with both ears. Suddenly the instruments, which were clear and distinct enough before, will practically jump right out into the air in front of you! Everything sounds much louder, clearer, closer, and very much more intelligible. This is almost exactly the difference which you will observe when you listen to stereo rather than monaural sound.
Why "almost?" Because, stereo is not quite the same thing as being put into the auditorium to listen to an orchestra. Right here is where we had beter consider two words used almost interchangeably — "stereophonic" and "binaural."
"Two-Channel Listening"
Both of these words have to do with two-channel listening — but they are not the same. The best description of the difference is that "binaural" sound reproduction puts the listener into the auditorium, while "stereophonic" sound reproduction puts the orchestra into the living room or classroom.'
Twenty-five years ago Bell Telephone conducted an extended series of experiments with two-channel listening and achieved results which have not been surpassed to this day. Their experiments made use of a wax dummy named Oscar. In each of Oscar's ears was located a tiny microphone, and each microphone was connected, through high-quality amplifiers, to one earphone of a headset.
The microphone in Oscar's left ear was connected to the left earphone; that in his right ear to the right earphone. Thus, when anyone put on the headset he was, in effect, hearing exactly what went into Oscar's ears, not what would go into his own.
Left and Right-Hand Effect
The effect was startling, since there was no perceptible distortion in the system and the frequency range was very wide, providing extremely natural sound. Oscar could be seen behind a glass (soundproof) wall, and anyone walking around Oscar and talking to him could also be seen. Upon putting on the headset and looking forward at Oscar and the man talking to him, the observer would naturally expect to
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