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September 11, 1946
PTM BROADCASTING MAY INCREASE RADIO TIME; BUSINESS USES
It is believed that one of the first applications of the International Telephone and Telegraph Corporation multi-service simultaneous broadcast transmission (known as Pulse Time Modulation PTM) demonstrated in New York last week, will be for special business uses. However, at the public showing, eight broadcasting booths representing the miniature eight broadcasting studios operating simultaneously fed the following into the transmitter atop the I. T. & T. Building: (1) New York Times Telephoto and Facsimile;
(2) Dow Jones News Ticker: (3) Teletype similar to that used by the major press associations (AP, UP, INS) in news transmission; (4)
A live voice news commentator; (5) a frequency modulation ( FM )program by the Columbia Broadcasting System; (6) A rebroadcast of an amplitude modulation (AM) radio program; (7) A "Muzak" recording, and (8) a recording of popular music.
As applied to regular commercial broadcasting, the PTM radio broadcasting system, it was said, will increase by at least eight-fold the time available on the air, thus permitting a wide variety of programs, including many which, because they appeal to special audiences, are now crowded off the air or relegated to the least desirable hours of the day.
Subject to frequency allocations by the Federal Communica¬ tions Commission, companies furnishing recorded musical programs will be able to dispense with wires and offer to each customer his choice of eight or more different programs. Hotels will be abLe to offer the same selection to e ach of their guests by satellite receivers.
PTM multiplex broadcasting is said to be ideally suited to the growing needs of newspapers and news services. The various chan¬ nels may be allocated to teletype, voice or photofacsimile circuits in any combination of local, national or international coverage.
More specialized adaptations v^ill be found to suit the requirements of stock exchanges, barks, brokerage concerns and advertising agen¬ cies.
Although the number of broadcasts that can be transmitted simultaneously by PTM are by no means sharply limited, the system as demonstrated involved the use of eight separate and distinct broad¬ cast operations. Those attending the demonstration witnessed the programs as they actually originated and were transmitted from 67 Broad Street on the top floor of the International Telephone Build¬ ing. Following this they were taken to the Federal Telecommunication
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