. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. High Pass Filter. q|:>-r^!p- F"iG. 6. ample, if all frequencies above 1000 were eliminated, it would be possible to determine what intelligibility is carried by this range of frequencies. Fortunately one of the recent electrical inventions is admirably adapted for this purpose, namely, the electrical wave filter invented by Dr. G. A. Campbell. This device was used extensively in this investigation. The schematic circuit diagrams of the two types of filters whic
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. High Pass Filter. q|:>-r^!p- F"iG. 6. ample, if all frequencies above 1000 were eliminated, it would be possible to determine what intelligibility is carried by this range of frequencies. Fortunately one of the recent electrical inventions is admirably adapted for this purpose, namely, the electrical wave filter invented by Dr. G. A. Campbell. This device was used extensively in this investigation. The schematic circuit diagrams of the two types of filters which were used are given in Fig. 6. This arrangement of coils and condensers produces an electrical conductor with the unusual properties that it transmits without appreciable diminution in amplitude any frequency between certain limits and reduces the amplitude of all frequencies outside these limits to less than 1/1000 of their original value. By varying the numerical values of the inductances and capacities this transmitted range can be placed at any desired position. In the arrangement which was used in the investigation these coils and condensers were. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Telephone and Telegraph Company. [Short Hills, N. J. , etc. , American Telephone and Telegraph Co. ]
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
