Difference between revisions of "NVGate Filter Builder"

====Filter builder====

Manage the filters definition and position. These filters operate on the time domain series. They can be applied in various locations in the signal process (Inputs, Plug-in channels, Outputs, Player tracks).

On [[NVGate_Ribbons:_Acquisition_Tab|acquisition tab,]] The left button (''Apply to''), on filter group, allows dispatching the filters to the different possible locations in the signal process.

The second button allows selecting a filter type and opens the corresponding setup.<br>

''Apply to:'' '' This button opens the filter dispatching dialog:

All filters are available, and by adding any filters to any channel, the properties of filters and channels selected are displayed and filters are applied in the current measurement:

[[Image:Reports_Tools_Ribbons_372.png|framed|none]]

Warning: Due to bandwidth compatibility, the filters use is exclusive of the plug-in. I.e: Once a filter is associated to a location (ex: a plug-in channel) it can be used on only the same plug-in channels. The front-end is considered a plug-in.

====Filters====

[[Image:Reports_Tools_Ribbons_373.png]]: Used to design a high-pass filter or a low-pass filter (Butterworth, elliptic…).

* '''Label''': the name of the filter (by default High-Low pass n, with 1 <nowiki><</nowiki>= n <nowiki><</nowiki>= 4).

* '''Type''': the type (Low pass or High pass) of the filter.

* '''Filter order''': filter order from 1 to 6. The higher is the order, the steepest is the cut-off slope.

* '''Applied to''': Indicates on which plug-in the filter can be used. Indeed the construction of the filter requires applying it on signal with the same bandwidth. The determination of the associated plug-in/bandwidth is automatic. Deactivate the filter to reset it.

The other modules (front-end, monitor, resources) operate at the front end input sampling (in connected mode on-line) or to the max player bandwidth (in post analysis mode).

Note even if plug-ins run in the same bandwidth, its not possible to share filters between different plug-in.

* '''Cut'''-'''off frequency''': the filter cut-off frequency. Its maximum value is the input frequency range. Its minimum value is: FR / 40 (for a Low pass filter) and FR / 400 (for a High pass filter), where FR is the input frequency range.

'''Warning '''for measurements including signal phase (i.e: balancing or Bode plot)''' '''the cut-off frequency must be chosen far (10 times) from the frequency of interest. If not, the phase of the low pass filter will affect the phase of the result.

* '''Label''': the name of the filter (by default Pass-Stop band n, with 1 <nowiki><</nowiki>= n <nowiki><</nowiki>= 4).

* '''Type''': the type (Band pass or Band stop) of filter.

* '''Filter order''': 2, 4, 6, 8 or 10. The higher is the order, the steepest is the cut-off.

* '''Applied to''': Indicates on which plug-in the filter can be used. Indeed the construction of the filter requires applying it on signal with the same bandwidth. The determination of the associated plug-in/bandwidth is automatic. Deactivate the filter to reset it.

The other modules (front-end, monitor, resources) operate at the front end input sampling (in connected mode on-line) or to the max player bandwidth (in post analysis mode).

Note: even if plug-ins run in the same bandwidth, it not possible to share filters between different plug-in.

* '''Low cut-off frequency''': the low filter cut-off frequency. Its minimum value is 0.055 * FR, where FR is the input frequency range. However, the following conditions must also be fulfilled:

'''0.0075 * FR <nowiki><</nowiki>= B <nowiki><</nowiki>= 0.5 FR'''

where B is the bandwidth between Low and high cut-off frequency and FR is the input frequency range.