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294 IX. SOUND-RECORDING EQUIPMENT AND ARRANGEMENT
51B recording system. Figure 71B is the Maurer recording system. ure 71C is the Maurer 16-Mm film phonograph.
Fig
Future Trends in Noise Suppression
Despite the rather chaotic situation resulting from the lack of performance standards for 16-mm sound projectors and films, there are evidences of a "settling down" of performance and of response-frequency characteristics in the better grade machines. In the Bell and Howell, for example, the slit size was reduced from 1 mil to approximately 0.7 mil several years ago. Since the high-frequency performance of the ma
Fig. 71B. Maurer 16-mm sound recording equipment (without carrying cases). Consist of Sola voltage regulator, Maurer sound recording machine, Maurer recording amplifier, Maurer power supply, Shure microphone, microphone tripod, Western Electric monitoring headphones, and interconnecting cables. The equipment shown is completely energized from a 117-volt 60-cycle single-phase power line without batteries of any sort.
chine was noticeably improved by this manufacturing change, it was necessary to improve the performance of other parts of the machine. The major improvements were a reduction of flutter (which is more perceptible when the frequency range is wide), a reduction in the microphonic sensitivity of the exciter lamp and its associated optical system, and a reduction in noise and distortion of the amplifier. If the cheap 11 boxtype" loudspeaker that is still used is replaced by a good loudspeaker, such as the Altec 604B or the Western Electric 755A with an appropriate housing, the performance of this machine is surprisingly good when a really good print is used. The performance has but one