Aim of binaural sound: to give the ears the same effect of realistic "presence" that Cinerama filmsor the old-fashioned stereoscopegive the eyes.
The "binaural principle" of acoustical direction-finding is basically the same as that which enables a human being (with good hearing in both ears) to tell approximately whence a .
His solution: adapting binaural or stereophonic sound (picked up by two microphones, fed through two channels and reproduced separately by two speakers) to records.