| 摘要 |
PROBLEM TO BE SOLVED: To allow the formation of a wide band-ranging at a low cost while restraining the deterioration of a characteristic to the minimum, and to realize an event trigger function. SOLUTION: A FIFO memory 28 stores the second digital signal and reduces its transfer speed. A multiplexer(MPX) 30 outputs selectively either of the first digital signal or an output signal of the memory 28. A DSP 18 FFT-operates an output signal of the MPX 30. A memory 20 stores an operated result of the DSP 18. A trigger detector 32 compares an operated result of the first digital signal by the DSP 18 with a prescribed trigger condition data to generate a trigger signal when a trigger condition is satisfied. A memory controller 34 controls a storing operation for the FIFO memory 28 in response to the trigger signal. A data to be remained in the FIFO memory 28 out of data generated by a wide band signal processing means is thus controlled in response to a trigger function.
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