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Demonstrate ImportantTelevision Advances(4THREE new achievements in television research, descr bed as “important steps forward in solving television’s fundamental problems” were announced by William H Grimditch,vice-president in charge oi the PhilcoRadio Television Corporation s extensive engineering laboratories.The announcement was made here at a special showing in Philadelphia attended bv radio anc. science writers from New York, Philadelphia, and Washington.The three Pbilco advances as describedbv Mr. Grimditch are: . .‘ 1 Better television picture—Televisionreception of a 605 line picture instead of the present 441-lines. This gives an increase of 30 percent in picture detail.The new 605-line picture has!24 framesper second in accordance with standard motion picture practice.2 Plug-In-Television — Television reception based on vertical wave trans-miSfpermitting built-in vertical loop S. Discrimination against noi^eUse of the built-in loop antenna to re-duce diathermy and noise interference, one of television’s most vexing problems.‘To the public,” Mr, Grnnditch naid,“these advances will mean a better television receiver at tower cost.Althougl these achievements are important steps forward toward making television as re iable as present-day a dio broadcasting.’ Mi Grimditch adde ,“one big problem yet to be solved is a better, simpler, stronger and more reliable synchronizing system to Prev^”picture slippage before television becomes practical ”The achievement of a b05-lme, ^4 frame television picture, an improvement of more than 30 percent over presenttelevision reception, is the ^sent over the air to date, Mr. Qnmditch stated. The added detail made possible by the 605-line picture, he said might make practical television pictures projected on a large screen, an achievementwhich has not been satisfactory becauseof the spaces between lines when 441-line pictures were orojected.“A comparison which mav give an idea of this improvement is the difference between the coarse screen reproduction of a picture on ordinary newsprint andthe fine screen reproduction of the same picture on slick naper ” Mr. Grimditchexplained ‘The coarse screen newspaperreproduction may be likene. to the^4 line television picture in use up to thepresent while the fine screen reproduction on slick paper is compaiable to whatone sees on a television screen with a605-line picture.”The built-in vertical loop antennaeliminates the costly and hazardous in-stallation of large dipoles which are placed atop towers on the user’s roof to receive television signals sent horizontally polarized from television broadcasting station. The built-in vertical loop, which obviates the expensive construction of the dipoles, employs vertically polarized waves, in contrast to the horizontally polarized waves ordinarily used. ;Interference from diathermy machines, which are extensively ised by physicians and hospitals in modern medical therapy and of which there are between 30,000 and 40,000 already in use in the UnitedStates, has been greatly eliminated by the built-in vertical loop, Mr. Grimditch reported. He explained that interference to television is caused not only by diathermy machines in hospitals and physicians’ offices, but also by numerous home diathermy machines obtainable by anyone on a rental basis.“One such machine,” Mr. Grimditchpointed cut, “ruins television reception for miles around. However, with vertical transmission, the directional property of the loop under control of the user gives the possibility of eliminating this serious interference which is not practical by any other neans. Until the development of the vertical television loop, a climb to the roof in all sorts of weather was the lot of the television user who wished to change the direction of his roof antenna to eliminate the diathermy interference. Besides, the possibility of falling dipoles on power lines created a dangerous firehazard.Gross injustice would be done to the public if present television standards are commercialized an'1 frozen,” Mr. Grimditch declared. “Television is still in the laboratory and these new developments are pretty good indications of that fact. We’ve had 441-line tel' vision up to the present, but now with 605-line television it will be necessary to make considerable adjustments and changes before receivers already on the market can pick up pictures of the improved type.The three new achievements developed by Philco engineers have already beenpresented and demonstrated before members of the Federa’ Communications Commission in lir e with ths company s recent stand against freezing of present television standards and against limited commercial licensing of television broadcasting stations.Pioneer of television research since 1928, Philco, the world’s largest manufacturer of radio receivers operates Television Station W3XE, Philadelphia s only television station. All programs, originating from station W3XE, of course, are on a strictly experimentalbasis.s
Newspaper Details
Republic Advertiser
Republic, Kansas, US
Thu, Oct 10, 1940
Page 14
Full Page
Clipped by
Anonymous
AU 13 May 2022
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