. The Bell System technical journal . •TEST RECEIVER STRINGOSCILLOGRAPH CONDENSER MICROPHONE-6 CO. COUPLERFig. 4—Circuit diagram of apparatus for indicial response 10,000 (B)Fig. 5—Frecjuency response (A) and indicial response (B) of measuring apparatus. microphone voltage is then amplified to the point where it can be measuredby an oscillograph. Either the cathode-ray oscilloscope or a rapid-recording string oscillo-graph^ may be used, but in the latter case it is necessary to equalize thestring oscillograph to a frequency of about 10 kc in order to cover the audiofrequency ran
. The Bell System technical journal . •TEST RECEIVER STRINGOSCILLOGRAPH CONDENSER MICROPHONE-6 CO. COUPLERFig. 4—Circuit diagram of apparatus for indicial response 10,000 (B)Fig. 5—Frecjuency response (A) and indicial response (B) of measuring apparatus. microphone voltage is then amplified to the point where it can be measuredby an oscillograph. Either the cathode-ray oscilloscope or a rapid-recording string oscillo-graph^ may be used, but in the latter case it is necessary to equalize thestring oscillograph to a frequency of about 10 kc in order to cover the audiofrequency range. The choice of these instruments depends somewhat uponwhether a permanent record is desired or whether a visual indication issufficient. INDICIAL RESPONSE OF TELEPHONE RECEIVERS 141 The amplifier must be compensated at low frequencies in order to main-tain a strictly square-wave output. The entire system characteristic isshown in Fig. 5 and covers a range of 1 to 10,000 cps with a substantiallyuniform frequency response. The indicial response of the system is alsoshown to be reasonably free from irregularities. Such irregularities as doexist are due largely to the sh
Size: 2879px × 868px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
