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286 IX. SOTJND-KECOKDING EQUIPMENT AND AKKAXGEMEXT
of compressing the volume range by 55 db does not often arise ; however, cases do arise where the volume range of the sound at the microphone is greater than can be accommodated, and something has to be done about it Should a film with a volume range wider than that of a projector be run in the projector, the low-level portions will be below the general noise level and will therefore be inaudible or unintelligible.
When a sound recordist or mixer man operates his equipment, one of his chief duties is to make certain that the loudest sounds to be recorded are so controlled in recording that they are not "overshot" beyond the full modulation capabilities of the recording machine. If the volume
Fig. 68. Electrical schematic of the RCA MI10236 noise reduction amplifier.
This amplifier has the ability to respond to nonsinusoidal wave forms such as l ' spikes ' ' (pulse signals of short duration) to a degree approaching its sine-wave response. Such an amplifier is said to have good peak-reading ability.
of the sound to be recorded changes slowly, and the effect desired is one of relatively constant volume, the mixer man moves his "mixer pot" to compensate for the changes in sound level. Such manual control is quite effective in recording the speech from an experienced commentator. With an untrained speaker, however, even the best such recording often proves unsatisfactory — particularly under unfavorable conditions of reproduction, such as reproduction in an acoustically poor auditorium.
It was found that one of the differences between "a good recording voice" and "a poor recording voice" lies in the amplitude of short period peaks produced in the voice. A "good recording voice" is "easy to record" because it has few if any short-period peaks; those that are present occur infrequently and have a small peak amplitude when compared