. The Bell System technical journal . 35 30 I 25 TELEPHONE-SET SPEECH-SIDETONE 20IN DEC I. _ RANGE OF , ANTI-SIDETONE SETAVERAGE 15 I 10 I 5 0 IBELS (above air SPEECH-SIDETONE) 15 10 5 0 -5 -10 -15 -20 TELEPHONE-SET SIDETONE ROOM-NOISE IN DECIBELS(above ROOM-NOISE IN FREE EAR) Fig. 5—Effects of sidetone on user of telephone. sidetone, which, as noted before makes the user think he is talkinglouder than he actually is. The average sidetone reduction of 10 dbfor the anti-sidetone set results in less of this restraint on his talkinglevel, with a resultant net effective gain in transmitting of abo
. The Bell System technical journal . 35 30 I 25 TELEPHONE-SET SPEECH-SIDETONE 20IN DEC I. _ RANGE OF , ANTI-SIDETONE SETAVERAGE 15 I 10 I 5 0 IBELS (above air SPEECH-SIDETONE) 15 10 5 0 -5 -10 -15 -20 TELEPHONE-SET SIDETONE ROOM-NOISE IN DECIBELS(above ROOM-NOISE IN FREE EAR) Fig. 5—Effects of sidetone on user of telephone. sidetone, which, as noted before makes the user think he is talkinglouder than he actually is. The average sidetone reduction of 10 dbfor the anti-sidetone set results in less of this restraint on his talkinglevel, with a resultant net effective gain in transmitting of about 4db compared with the sidetone set. In receiving, Fig. Sh, sidetone introduces an effective loss by thereproduction in the telephone ear of room noise picked up by thetransmitter. It will be noted that for the anti-sidetone set, thereproduced noise is in general appreciably lower than the room noise TRANSMISSION FEATURES OF NEW TELEPHONE SETS 369 itself. Inasmuch as room noise also interferes directly with receivedspeech in the telephone ear by leakage under the receiver cap, thec
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
