We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
256 IX. SOUND-RECORDING EQUIPMENT AND ARRANGEMENT
a projector, it is almost impossible to anticipate the wide variety of projector response-frequency characteristics that are in commercial use. A good commercial procedure is to select a particular make and model projector as a reference and to equalize all recordings so that they are run with the projector controls of the reference machine in the "normal" position. The selection of the reference projector must be made with great care; its characteristics should remain constant from day-to-day and month-to-month ; its specifications should deviate but the least practicable from those of the American "War Standard Z52. 1-1944 "Projection Equipment, Sound Motion Picture, 16-Mm Class 1." Should it be possible to specify the projectors to be used for the projection of the film to be produced, all should be preferably of the some make and model as the reference machine.
For the protection of the purchaser and for the mutual benefit of all concerned, it seems that standardization of the slit-loss responsefrequency characteristic and standardization of either the system response-frequency characteristic up to the amplifier output or standardization of the over-all response-frequency characteristic of 16-mm sound projectors is sorely needed. Effective standardization has existed for 35-mm projection for more than a decade and the time for similar standardization in 16-mm is long overdue.
To compensate for film loss, it is first necessary to know the actual film loss. Therefore, a decision must be made as to just how films are to be processed and copied, and no deviation can be permitted from the procedure so established. It is possible to keep this loss to as low as 8 db per step if great care is exercised ; a loss of 20 db or even more can occur in the single step from the original sound negative to the release print under poor laboratory conditions ; unfortunately, such losses are not rare.
Some recent Maurer 16-mm recording equipment provides equalization for film losses in three steps of 3 db, 6 db, and 9 db occurring at about 5500 cps. Whether this equalizing or, for that matter, any other equalizing is satisfactory will depend upon the film losses to be encountered and the characteristics of the sound projectors to be used. The outlook for good sound quality would seem hopeful for the better 16-mm sound properformance of commercial loudspeakers supplied with 16-Mm projectors, the Subcommittee has chosen to make its test with two-way reproducing systems such as are used in theatres. Although there is some difficulty in establishing the correlations of pre-war two-way loudspeaker systems with the larger number of post-war two-way systems of somewhat different performance, the progress made is very encouraging.