16-mm sound motion pictures : a manual for the professional and the amateur (1953)

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ROUTINE AMPLIFIER CHECKING 275 character and in magnitude. Since the objective of the measuring of distortion is to "show up" the distortion rather than to "hide" it, a method which is designed specifically for "showing up" the distortion produced by one specific recording system will ordinarily become less and less adapted to other systems as it is made more sensitive to the distortion produced by the system for which it was designed. Recommendations should be obtained from the manufacturer; emphasis should be laid upon the time taken by the test and the explicitness of the test results in terms of practical system operation. Some of the firms manufacturing test equipment and some of their products are: Hewlett-Packard, Palo Alto, Cal. Sine-wave audio oscillator Square-wave generator Secondary standard frequencyassembly with frequency dividing (for reference frequencies) RCA, Camden, N. J. Flutter bridge Cross-modulation test oscillator Altec-Lansing, Los Angeles, Cal. Intermodulation test equipment General Radio Co., Cambridge, Mass. Harmonic analyzer Standard resistors, capacitors, inductances Western Electric Co., New York, N. Y. Intermodulation test equipment, E.R.P. Division Noise-measuring equipment, band filters, etc. Allen B. Dumont, Passaic, N. J. Cathode ray oscilloscope Distortion measurement is certain to advance very rapidly and improve materially in the near future ; the American Standards Association has authorized the establishment of a new Sectional Committee (Z57) for Sound Eecording. The sponsors of the committee are the SMPE and the Institute of Radio Engineers ; the scope of the work covers standards for interchangeability and performance of sound records and sound-recording and reproducing equipment, including, for example : (1) the dimensional standards and physical properties of the recording media and the speeds at which they are operated; (2) the frequency characteristics and noise and distortion limits of records and recording apparatus; and (3) such definitions, terms, symbols, and methods of test as are found desirable. Subcommittee 2 of the Committee has as its scope the development of standard methods for the measurement of recording media ; this scope includes methods of evaluating or measuring