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.
TELEVISION 353
problem of transmitting and receiving an image such as we have described can be appreciated.
Let us see what sort of a picture is possible with 2,304 dots. Many newspaper cuts are photographed through a number 60 screen, which means that there are sixty transverse and sixty vertical rows of dots a square inch. This means that there are 3,600 dots a square inch. If our image has the definition of the average newspaper picture, then it can cover about two thirds of a square inch. To keep the same definition and increase the image size requires the transmission of a greater number of dots. This is objectionable for several reasons. In the first place, the above picture requires a transmitting band of approximately 46,000 cycles, or 46 kilocycles, since the carrier is modulated by 23 kilocycles on each "side band." This encroaches severely on the available channels, and the Federal Radio Commission is now establishing regulations to govern television broadcasting. Then, too, the transmitting and receiving equipment require very special design to make our project possible. If the number of dots is greatly increased, with a necessarily corresponding decrease in the interval for each interval, the limiting time required for the production of a reaction from the light stimulus is exceeded, and the image is not seen!
If, on the other hand, the size of the image is increased without increasing the number of dots, the definition becomes poorer. If the picture is to be 1.5 inches square, the 2,304 dots must be spread over this area of 2.25 square inches, giving only about 1,000 dots a square inch, or the equivalent of a 32 mesh. This still is a reasonably good definition. It is actually an indication of what may be expected in the near future in both definition and size.
Working at the problem from another direction, let us suppose that we are to stay in the 10-kilocycle band allotted to each station. This permits us 5,000 cycle