Some techniques toward better stereophnic perspective

Improvements in stereophonic sound reproduction are identified with those qualities which cause the recorded performance to recall similar real performances in the minds of the listeners. This paper describes the results of research at CBS Laboratories toward improvements in recording of space perspective. Two experiments are described: 1) On the use of back-to-back limaçon microphones for reproducing correctly the direction of reverberation and other space sounds. 2) On the design and use of a device called the stereophonic spreader and shifter to spread a monophonic sound to cover any desired proportion of the stereophonic field, and then to position it anywhere in the field, within or outside the limits of placement of the loudspeaker. These devices are characterized as tools which may be used by the recording director to convey to the listener the desired artistic message.