Real time signal analyzer
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United States of America Patent
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Nov 19, 2002
Grant Date -
N/A
app pub date -
Jul 30, 1999
filing date -
Feb 12, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to a real time signal analyzer that can produce time domain data and frequency domain data at the substantial same time and in real time, securing the simultaneousness between them, and can analyze them with changing the setting of the center frequency and the signal analysis span arbitrarily in low cost configuration. The apparatus has frequency conversion means 14 and 16 for shifting the frequency of input time domain data according to a selectable center frequency data and for decimating them according to a selectable decimation coefficient, a FFT processor 18 for FFT processing the output data of the frequency conversion means in real time, a delay means 28 for delaying the output data of the frequency conversion means for a predetermined time, a frequency domain data memory means 32 for storing the FFT processed frequency domain data from the FFT processor, a time domain data memory means 36 for storing the delayed time domain data read out from the delay means, and feedback means 30 and 38 for feeding the data read out from the time domain data memory means back to the frequency conversion means instead of the input time domain data.
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