| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication apparatus capable of automatically observing the frequency characteristics of noises on telephone lines. SOLUTION: A calculation controller 4 turns a switch circuit SW1 to off. A spectrum analyzer 6 measures the frequency spectrum of a noise N1 appearing on the input of a receiver 3. The calculation controller 4 turns the switch circuit SW1 to on, the spectrum analyzer 6 measures the frequency spectrum of a noise N2 appearing at the input of the receiver 3, the calculation controller 4 subtracts the frequency spectrum of the noise N1 from that of the noise N2 to calculate the frequency spectrum of a noise N3. Thus the frequency characteristics of the noises on telephone lines can be automatically observed to reduce the labor for measuring the noises. COPYRIGHT: (C)2007,JPO&INPIT
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