Signal post-processing method, signal post-processing circuit and oscilloscope
AssigneeRohde & Schwarz GmbH & Co. KG
InventorThomas Günther
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Abstract
A signal post-processing method is described, wherein a time-and-value-discrete signal is read from a memory by a signal post-processing circuit wherein a resolution bandwidth and a frequency range of the time-and-value-discrete signal are predetermined. A window filter is applied to the time-and-value-discrete signal. The window filtered time-and-value-discrete signal is transformed to a full-bandwidth frequency-domain signal. A sub-band is selected from the full-bandwidth frequency-domain signal by a selection unit wherein the rest is discarded by the selection unit. Further, a signal post-processing circuit as well as an oscilloscope are described.
Claims16
A signal post-processing method, comprising the following steps:
- reading a time-and-value-discrete signal from a memory by a signal post-processing circuit, wherein a resolution bandwidth and a frequency range of the time-and-value-discrete signal are predetermined;
- applying a window filter to the time-and-value-discrete signal;
- transforming the window filtered time-and-value-discrete signal to a full-bandwidth frequency-domain signal;
- and
- selecting a sub-band from the full-bandwidth frequency-domain signal and discarding the rest by a selection unit.
A signal post-processing circuit for a test and measurement instrument, comprising:
- a reader unit configured to read a time-and-value-discrete signal from a memory;
- a filter unit coupled to the reader unit and configured to apply a window filter to the time-and-value-discrete signal read out from the memory;
- a transform unit located downstream of the filter unit and configured to transform the filtered time-and-value-discrete signal to a full-bandwidth frequency-domain signal;
- and
- a selection unit coupled to the transform unit and configured to select a sub-band from the full-bandwidth frequency-domain signal and discard the rest of the full-bandwidth frequency-domain signal.
Dependencies are inferred from the claim text.