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ASYNCHRONOUS SOUND 209
mirror of a human face. For instance we hear the screaming of a siren. Such a sound does not acquire a dramatic significance unless we can see from the expression on human faces that it is a danger-signal, or a call to revolt. We may hear the sound of sobbing, but how deep its meaning is will become evident only from the expression of sympathy and understanding appearing on some human face. Further, the acoustic character of a sound we understand is different too. We hear the sound of a siren differently if we know that it is a warning of impending deadly peril.
The face of a man listening to music may also show two kinds of things. The reflected effect of the music may throw light into the human soul; it may also throw light on the music itself and suggest by means of the listener's facial expression some experience touched off by this musical effect. If the director shows us a close-up of the conductor while an invisible orchestra is playing, not only can the character of the music be made clear by the dumbshow of the conductor, his facial expression may also give an interpretation of the sounds and convey it to us. And the emotion produced in a human being by music and demonstrated by a close-up of a face can enhance the power of a piece of music in our eyes far more than any added decibels.
ASYNCHRONOUS SOUND
In a close-up in which the surroundings are not visible, a sound that seeps into the shot sometimes impresses us as mysterious, simply because we cannot see its source. It produces the tension arising from curiosity and expectation. Sometimes the audience does not know what the sound is they hear, but the character in the film can hear it, turn his face towards the sound and see its source before the audience does. This handling of picture and sound provides rich opportunities for effects of tension and surprise.
Asynchronous sound (that is, when there is discrepancy between the things heard and the things seen in the film) can acquire considerable importance. If the sound or voice is not tied up with a picture of its source, it may grow beyond the
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