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.
June, 1930] VARIABLE AREA SOUND FlI^MS 649
marked gains to the industry in uniformity and saving in film recording has benefited the laboratories which are glad to work the scientific methods. The scientific method gives the laboratory man better evidence to show that he is doing his job right.
I should like to take exception to the statement that we are not interested in frequencies above 6000 cycles. The present aim is to attain between 8000 and 9000. One of the methods we use in determining whether reproducers are in proper adjustment is to examine critically at 15,000 cycles where maladjustment shows up more readily than at lower frequencies.
With regard to the reproduction loss at 6000 cycles, of Ql/2 decibels, for standard practice, I believe that is incorrect.
In reply to Mr. Cook's discussion relating to comments at the New York meeting, Mr. Stryker has a paper in which actual experimental confirmation shows a close check and the loss for a one mil slit at a frequency of 6500 is 2 decibels; if it were more than this, we would change the design.
MR. MAURER: Frequencies above 6000 are going to be of decided importance n the reproduction of sound. This analysis made a number of months ago was confined to 6000 cycles because the response over the loud speakers now in use cuts off substantially at 6000 cycles. With reference to the disagreement with regard to the amount of the slit loss, I am unable to say where the disagreement may arise.
MR. HYNDMAN: I don't believe that Mr. Palmer's original question was given due consideration. He assumed that the density could be controlled by adjusting the lamp. As a matter of fact, that is the easiest problem. The principal problem of controlling density is one of development. It is very easy to get consistent results for contrast or density. At present, there is a laboratory in New York that is developing variable density film to an average track density of 0.7, and they have been very successful with their particular method of processing in meeting this value within about 5 per cent.
MR. TUTTUS: Mr. Maurer's paper also will appear in the June JOURNAL. All those contributing to the discussion are urged to see that the material is corrected before they leave the convention.