. Elements of acoustical engineering. Electro-acoustics; Sound. 312 ARCHITECTURAL ACOUSTICS STUDIO ACOUSTICS or SET. MICROPHONES AMPLIFIERS EQUALIZER AND FILTERS ATTENUATOR AMPLIFIER MONITOR ACOUSTICS OF MONITORING ROOM AMPLIFIER ATTENUATOR EQUALIZER OPTICAL SYSTEM MODULATOR NEGATIVE RECORD LABORATORY PROCESSING - PRINTING ^%_^ NEGATIVE RECORD two other conditions tend to operate against the ideality of the system. The first arises from the fact that the acoustical characteristics of the theatre or auditorium are superimposed upon that of the set. Another objection arises from the necessity of
. Elements of acoustical engineering. Electro-acoustics; Sound. 312 ARCHITECTURAL ACOUSTICS STUDIO ACOUSTICS or SET. MICROPHONES AMPLIFIERS EQUALIZER AND FILTERS ATTENUATOR AMPLIFIER MONITOR ACOUSTICS OF MONITORING ROOM AMPLIFIER ATTENUATOR EQUALIZER OPTICAL SYSTEM MODULATOR NEGATIVE RECORD LABORATORY PROCESSING - PRINTING ^%_^ NEGATIVE RECORD two other conditions tend to operate against the ideality of the system. The first arises from the fact that the acoustical characteristics of the theatre or auditorium are superimposed upon that of the set. Another objection arises from the necessity of requiring that the sound sources be spread far apart for the best effect. That means that the picture that is being reproduced should be spread out to cover the same dis- tance occupied by the sound source; otherwise, the sound will LOUD SPEAKER appear to come " off stage " in- RECEivERs^ stead of from the picture. In ATTENUATOR thc casc of tadio reproduction it may be impossible to spread the loud speakers sufficiently to obtain good illustration of per- spective. D. Sound Motion Picture Repro- ducing System.—A complete sound motion picture recording and re- producing system is shown in Fig. The first element is the acoustics of the set. The factors which influence the collection of sound have been discussed in Sec. The output of the micro- phones is amplified and fed to attenuators termed mixers. If more than one microphone is used as, for example, a soloist accom- panying an orchestra, one micro- phone for the singer and one for the orchestra, the output of the Fig. Complete sound motion picture two may be adjusted for the recording, processing and reproducing sys- proper balance. A low pass filter is usually used to reduce ground noise above the upper limits of reproduction. A high pass filter is used on speech with the lower limit placed below the speech range. This latter expediency reduces low fre- quency noises without impairing the spee
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