Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

220 FREQUENCY MODULATION, Volume Jlistening test and the overall gain isobtained by subtracting the transmitterloss of 2.5 decibels from the values obtained from Figure 6.For speech reception, where the noises were balanced for equalintelligibility, it was found that there was little or no gain effectedby the de-emphasis circuit. For the case of amplitude-modulationnoise, the use of pre-emphasis would apparently entail a slight loss inintelligibility when the 2.5 decibel transmitter loss was subtracted.With frequency-modulation noise, an intelligibility gain of a few decibelswould be realized.In connection with the listening testsanother interesting observa-*t16-r