13 pages matching editions:LCCNsn79001244 in this book
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1000 cycle tone 144 weighting 90 dbrn attenuating effect Bell System Bell Syſtem Technical Bell Telephone C-message weighting complex wave crosstalk coupling CYCLES PER SECOND D. A. Lewinski db meter db transmission level Dba and dbrn dbm0 dbrn C-message decibels referred disturbed circuit ence power evaluate the interfering expressed in dba F1A line weighting F1A weighting Figure 1 includes flat noise H. E. Kent handset interfering tone line weighting characteristic logarithmic units means decibels Message Circuit Noise milliwatt noise measuring set Noise powers measured number of different open-wire voice fre power level program volume level quency circuits radio transmitters Reference coupling reference noise power reference power Reference Transmission Level Relative Interfering Effects steady sine wave Syſtem Technical Journal telephone industry telephone sets tone was superimposed transmission impairment transmission level point transmission lines voice frequency spectrum voltmeter Volume Units VU meters watt weighting curve Western Electric Type zero dbm