. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. A. SUPPRESSED. OUT B. UNSUPPRESSED Fig. 3—Repeating coil arrangement for suppressing echoes. operation from radio noise. When the incoming noise is low, relay 3 may be made very sensitive. Any incoming speech which does not operate relay 3 is thus weak, and the receiving volume may be kept high without danger of echoes operating the transmitting relays. When the noise is high, relay 3 is made insensitive, requiring more loss in the echo path and, consequently, lower vo
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. A. SUPPRESSED. OUT B. UNSUPPRESSED Fig. 3—Repeating coil arrangement for suppressing echoes. operation from radio noise. When the incoming noise is low, relay 3 may be made very sensitive. Any incoming speech which does not operate relay 3 is thus weak, and the receiving volume may be kept high without danger of echoes operating the transmitting relays. When the noise is high, relay 3 is made insensitive, requiring more loss in the echo path and, consequently, lower volume to the listener. The method of suppressing transmission by opening a single relay contact is illustrated in detail by Fig. 3. In A of this figure, the relay (i? on the figure) is assumed to be operated so that transmission is suppressed. The voltages induced in windings ^Si and 52 of the first coil are opposed to each other in a circuit including P2 and P3 of the second coil, the resulting flux in the core of this coil being very small. Losses. 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. ]
Size: 2767px × 903px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
