This standard is applicable to the standard measuring method of electroacoustic performance measurement of monophonic and stereophonic radio receivers for FM broadcast transmissions (including tuner, car radio, FM receiving part in combinational machine, as well as dedicated radio receivers for FM broadcast transmissions——all the above are referred to as receivers) .
2 Terms and requirements
2.1
values for voltage and current
root mean square (r.m.s.) quantities, unless otherwise stated
2.2
presentation of level
Levels of power, voltage and field strength are expressed in decibels, as shown in Table 1.
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2.3
carrier frequency
the mean value of the instantaneous frequency or the frequency generated in the absence of modulation, and for a perfect modulation system in which no d.c. component and no non-linear distortion are involved, the two values are the same
2.4
instantaneous frequency deviation
the difference between the instantaneous frequency of the modulated carrier frequency signal and the carrier frequency
2.5
peak frequency deviation
the peak value of the instantaneous frequency deviation
2.6
maximum system deviation
the maximum peak frequency deviation specified for the system under consideration, which is ±75 kHz in China
