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176
TEMPLIN
August
mixer preamplifier. The setting used in any particular instance will depend on the acoustic conditions on the set, the presence of wind or other low-frequency noises, and the quality of the particular voice being recorded.3 These equalizers are adjustable in 5 steps of 4 decibels each at 80 cycles per second with an OFF position. The shape of the family of curves agrees closely with those in general use in Hollywood studios. The average setting is 4 or 8 decibels for 35-mm recording and 12 or 16 decibels for 16-mm recording. For music recording the dialog equalizer is normally in the OFF position.
Fig. 16 shows the frequency-response characteristic for the high
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Fig. 16 — High-pass filter characteristics.
pass filter which is located at the input of the R A1282 amplifier. The high-pass filter is used particularly to eliminate components below the fundamental dialog frequency such as are produced by resonance effects on the set or other extraneous noise sources. These unwanted components, which may be subaudible, are thereb}'' prevented from operating the noise-reduction circuit or intermodulating the audible signals. The filter cuts off rather sharply, with the 6decibel loss point at approximately 120 cycles per second for 35-mm recording, and 180 cycles per second for 16-mm recording. A switch located on the upper side of the amplifier chassis transfers between these two positions or removes the filter from the circuit.
It will be observed that the dialog equalizer and high-pass filter