. Bell telephone magazine . 18. Visitors at New York Worlds Fair arenow trying the experimental picture-phone system installed there. vision, it provides a very acceptable headand shoulders view of a caller if the otherparameters are carefully chosen. It alsohelps to achieve economy because it sim-plifies using baseband transmission overordinary cable pairs. Another advantageis that this bandwidth is free of interfer-ence from the radio broadcast band of 550to 1500 kc. Design Objectives The general objectives of the picture-phone design included an attractivelystyled set, that would be small e
. Bell telephone magazine . 18. Visitors at New York Worlds Fair arenow trying the experimental picture-phone system installed there. vision, it provides a very acceptable headand shoulders view of a caller if the otherparameters are carefully chosen. It alsohelps to achieve economy because it sim-plifies using baseband transmission overordinary cable pairs. Another advantageis that this bandwidth is free of interfer-ence from the radio broadcast band of 550to 1500 kc. Design Objectives The general objectives of the picture-phone design included an attractivelystyled set, that would be small enough tobe used on a desk or table top and with asfew controls as possible to make it easy touse. It also had to be low in power con-sumption and heat dissipation, reliable,and stable in its performance. These de-mands were satisfied through a designthat uses solid-state devices exclusivelyexcept for the pick-up and display tubes. The set consists of three equipmentpackages: a display unit, a control unitand a power supply. The
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
