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.
Fig. 9. Visual gain and delay measuring set.
accomplished by means of remotely controlled switches under control of the operating center.
Maintenance
Television circuits must be kept within very stringent limitations with regard to both amplitude-frequency and delayfrequency response. This is done by a regular maintenance program, using special testing equipment by which both individual sections and entire networks are measured, and necessary adjustments made to provide satisfactory transmission.
As an illustration of such test equipment, Fig. 9 shows a visual gain and delay set which provides an oscilloscope presentation of both amplitude and delay responses.
Wider Band for Theaters
Theater television transmissions to date have been in monochrome and have utilized the same types of facilities as provided for television broadcasters. In the future, theater shows may swing to color. The color system adopted may be a system such as the National Television System Committee color system, but it may be of the sequential type.
If greater band widths are required, the Bell System will be in a position to supply them. Both the TD-2 radio relay system and the L3 coaxial cable system are fundamentally capable of carrying a bandwidth of at least 8 me. Figures 10 and 11 show measured responses, respectively, of a representative TD-2 radio relay channel and of a representative L3 coaxial channel. Future systems, one of which is already in the planning stage, will be capable of still greater bandwidths. With reasonable advance notice of requirements, we expect to be able to meet theater television's needs for both quantities of circuits and quality of transmission.
312
April 1954 Journal of the SMPTE Vol. 62