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RESPONSE-FREQUENCY CHARACTERISTICS
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the recorded voice quality deteriorates because of the predominance of the chest tones in the speaker's voice. Thus, a changed voice effort on the part of an announcer or speaker requires a further correction of the ' 'ideal" flat response-frequency characteristic. In the customary postrecorded film using an off-stage voice, the declamatory voice requires least correction and is usually preferred — especially when there is no psychological or other reason for a different type of voice.
As in the case of level difference correction, the magnitude of the correction required for voice effort depends upon the magnitude of the voice effort difference. Figure 30 shows typical corrections for average voice effort differences of 3, 6, 9, 12, and 15 db.
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Fig. 30. Dialog equalization corrections required for voice effort differences of 3, 6, 9, 12, and 15 db.
Voice Quality
It should be obvious that all male voices are not alike even at the same energy levels. Since ' ' the proof of the pudding is in the eating, ' ' the final test is the playback of the release print.
The various corrections described in the preceding sections and in this section are little more than rough approximations of the differences involved. Thus it will be found that the correction required for a particular loud male voice will be slightly different from the average male voice ; the precise correction is ordinarily determined by critical listening tests. For recording the particular male voice at a medium level, the correction given in the section on voice effort should make a good first approximation.
If the optimum correction is to be determined for a specific case, it is obtained through critical listening tests and should be found to differ