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78 MOTION PICTURE SOUND ENGINEERING
In the choice and use of corrective equalizers, a re-recorder can only be guided by ear. The nature and amount of correction must be determined by trial.
It is important to understand that phase and volume distortions cannot be corrected by attenuation equalizers. Reverberation is a phase effect — an echo, really, which cannot be removed from a record but which can sometimes be added. Volume distortion could only be corrected by introducing an inverse distortion in most cases, an almost impossible feat.
Another type of quality change sometimes utilized is to vary the pitch of a sound, which is accomplished by operating either the reproducer or the recorder at other than normal speed. This naturally affects the duration of the sound in proportion to the speed and pitch change. However, the harmonic relationship of overtones are not upset, so moderate changes do not cause unintelligibility in dialogue or harshness in music. Such a change docs modify the quality of the sound in addition to changing its pitch. A masculine voice raised an octave by this means would sound feminine.
13. SUMMARY
We are painting a picture. All of the mechanics we employ, whether acting, directing, photography or recording, are the brushes with which the thought colors are spread on the theatre screen. If one can get a better effect by smearing the paint on with his thumb than by using a more conventional tool, there is reason for doing it. Progress results from new tools developed to meet new needs.