. The Bell System technical journal . o. 4, April 1937, pp. 472-514. CARRIER TELEGRAPHJIETIIODS 519 45 tr 35 ? 30 / 1 f // / SINGLE sideband: / (A) NO SPACING CARRIER-*^ (B)-6 DECIBEL SPACING —VhCARRIER 7 (C) LINEAR /ON-OFF / / / J / / / // // / / / / / 11/ / / y ^ y / ^ FREQUENCY-SHIFT -^ ^ ^ ■ 24 -22 -20 -18 -16 -14 -12 -10 -8 -6 -4-2 0 2 NOISE-TO-CARRIER RATIO ON LINE IN DECIBELS Fig. 18—Distortion vs. noise characteristics of single-sideband, linear on-off andfrequency-shift arrangements at 60 (23 ). 45 Z 30 ^7 U-— -^ ^\ ^?- / 1785-I955~ TWO-source:(B) WITH LIMITER—*, ■
. The Bell System technical journal . o. 4, April 1937, pp. 472-514. CARRIER TELEGRAPHJIETIIODS 519 45 tr 35 ? 30 / 1 f // / SINGLE sideband: / (A) NO SPACING CARRIER-*^ (B)-6 DECIBEL SPACING —VhCARRIER 7 (C) LINEAR /ON-OFF / / / J / / / // // / / / / / 11/ / / y ^ y / ^ FREQUENCY-SHIFT -^ ^ ^ ■ 24 -22 -20 -18 -16 -14 -12 -10 -8 -6 -4-2 0 2 NOISE-TO-CARRIER RATIO ON LINE IN DECIBELS Fig. 18—Distortion vs. noise characteristics of single-sideband, linear on-off andfrequency-shift arrangements at 60 (23 ). 45 Z 30 ^7 U-— -^ ^\ ^?- / 1785-I955~ TWO-source:(B) WITH LIMITER—*, ■^ ^^ / —r- I T (C) NO LIMITER-^i,- _^ .——r -- —^ ^^^ ^-(D) I785-I955~ ONE- SOURCE ) TWO-BAND 1 f 1 1 1 1 ri__ \ -20 -18 -16 -14 -12 -10 -8 -6 -4-2 0 2 RMS. NOISE-TO-CARRIER RATIO ON LINE IN DECIBELS Fig. 19—Distortion vs. noise characteristics of two-band arrangem>;nts at (23 ).. -16 -14 -12 -10 -8 -6 -4 -2 NOISE-TO-CARRIER RATIO ON LINE IN DECIBELS - Fig. 20—Distortion vs. noise characteristics of frequency-shift arrangements at60 (23 ).
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
