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1949 THEATER TELEVISION 327
theaters in a city sharing certain facilities and co-operating together. Such a co-operative theater television group is described hereafter. Since the capital and operating expenses of any television enterprise are substantial, it is assumed that some or all the theaters in a city will form a co-operative group, and that this organization will be predominant in the theater television industry. The present discussion, therefore, is limited to a description of theater television in cities where it will be promoted and carried on by one or more co-operative groups. Theater television envisioning co-operative action by several theaters in a single city needs television transmission facilities for five purposes :
1. For distribution of programs from a central distributing point to groups of theaters. Such facilities may be described as ' 'MultipleAddressee Systems."
2. For transmission of programs from studios and regular origination points to the central distributing point. In broadcasting terminology, such fixed circuits are termed ''Studio-Transmitter Links."
3. For mobile remote pickup of programs and transmission to the central distributing point. In broadcasting terminology, these mobile units are known as "remote pickups," and are used for the origination of programs such as sports events, parades, news events, and stage shows.
4. For transmission of programs to intercity relay points. These fixed circuits also may be classified as "Studio-Transmitter Links."
5. For intercity relay of programs.
The use of transmission facilities by co-operative theater television groups is most easily explained by reference to Fig. 1, which is a diagram of a typical theater television system in two imaginary cities, City A and City B. City A is assumed to be located on the A. T. andT. coaxial cable, and City B is assumed to be located off the coaxial cable about 35 miles east of City A. City A contains 25 motion picture theaters which are part of the co-operative theater television group Hand receive programs from it. City B contains 15 such theaters.
In each city the key point of the theater television system is the [central distributing point where the multiple-addressee system is legated (marked on the diagram, "MAS"). The co-operative group in City A maintains studio-transmitter links (STL) from one studio or (theater which produces a daily stage show, and from the Municipal 1 1 Auditorium. It also utilizes two mobile remote pickup units, which ,are available for use in appropriate scenes of action throughout the