Difference between revisions of "NVGate 2021: Release note fr"

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NVGate 2021: Release note fr (view source)

Revision as of 17:41, 8 March 2021

173 bytes added ,  17:41, 8 March 2021
→‎Relax the limits of filtering!
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[[File:kiné_select_edit.png|400px]]
[[File:kiné_select_edit.png|400px]]


= Relax the limits of filtering! =
= Les limitations sur les filtres sont assouplies ! =


All details on the filters can be read [[NVGate_Filter_Builder|here]]
Tous les détails sur les filtres se trouvent [[NVGate_Filter_Builder|ici]]


===Relaxed constraints on the cut-off frequency===
===Plus de flexibilité pour les fréquences de coupure===


To guarantee the stability of the filter, there are certain constraints on the value of the cut-off frequency. Compared with previous version of NVGate, such constraints are relaxed significantly now.
Pour garantir la stabilité des filtres, il existe certaines contraintes sur la valeur de la fréquence de coupure. Par rapport à la version précédente de NVGate, ces contraintes sont désormais considérablement assouplies.


[[File:image_2020-11-27_095451.png|600px]]
[[File:image_2020-11-27_095451.png|600px]]


For the high pass and low pass filters, the maximum value of the cut-off frequency is the input frequency range '''FR'''. The minimum value is '''FR''' / 50000 in the Office mode, and '''FR''' / 40000 in the Connected mode. In the previous NVGate version, the minimum value was '''FR''' / 40 for the low pass filter, and '''FR''' / 400 for the high pass filter.  
POur les filtres passe-haut et passe-bas, la valeur maximale de la fréquence de coupure correspond à la fréquence d'analyse de l'input(frequency range) '''FR'''. La valeur minimale correspond à '''FR''' / 50000 en mode office et '''FR''' / 40000 en mode connecté. Dans la version précédente de NVGate, la valeur minimale était '' 'FR' '' / 40 pour le filtre passe-bas et '' 'FR' '' / 400 pour le filtre passe-haut.


For the band pass and band stop filters, the low cut-off frequency ''f''<sub>low</sub> and the high cut-off frequency ''f''<sub>high</sub> need to meet the following conditions in the Office mode:
Pour les filtres passe-bande et coupe-bande, la fréquence de coupure basse ''f'' <sub> low </sub> et la fréquence de coupure haute ''f'' <sub> high </sub> doivent remplir les conditions suivantes en mode Office:


* ''f''<sub>low</sub> ≥ 0.0001 * '''FR'''
* ''f''<sub>low</sub> ≥ 0.0001 * '''FR'''
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* 0.0004 * '''FR''' ≤ ''f''<sub>high</sub> - ''f''<sub>low</sub> ≤ 0.9998 * '''FR'''
* 0.0004 * '''FR''' ≤ ''f''<sub>high</sub> - ''f''<sub>low</sub> ≤ 0.9998 * '''FR'''


And in the Connected mode, the conditions are as below:
En mode connecté, les conditions sont les suivantes:


* ''f''<sub>low</sub> ≥ 0.0005 * '''FR'''
* ''f''<sub>low</sub> ≥ 0.0005 * '''FR'''
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* 0.000675 * '''FR''' ≤ ''f''<sub>high</sub> - ''f''<sub>low</sub> ≤ 0.99 * '''FR'''
* 0.000675 * '''FR''' ≤ ''f''<sub>high</sub> - ''f''<sub>low</sub> ≤ 0.99 * '''FR'''


In the previous NVGate version, the conditions on the cut-off frequencies were:
Dans la version précédente de NVGate, les conditions sur la fréquence de coupure étaient les suivantes:


* ''f''<sub>low</sub> ≥ 0.055 * '''FR'''
* ''f''<sub>low</sub> ≥ 0.055 * '''FR'''
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* 0.0075 * '''FR''' ≤ ''f''<sub>high</sub> - ''f''<sub>low</sub> ≤ 0.99 * '''FR'''
* 0.0075 * '''FR''' ≤ ''f''<sub>high</sub> - ''f''<sub>low</sub> ≤ 0.99 * '''FR'''


==Improved precision==
==La précision améliorée==
Now, the filters are calculated in 64-bit floating point format in the Office mode, and in 40-bit floating point format in the Connected mode. In the previous NVGate version, the 32-bit floating point format was used in both modes.
Maintenant, les filtres sont calculés en format 64-bit floating point en mode office et 40-bit floating point en mode connecté. Dans la version précédente de NVGate, le format était 32-bit floating point dans les deux modes.




===New prototype filters===
===Nouveaux types de filtres===
In addition to the Butterworth filter, now you can build the IIR filters with the Chebyshev type I (band-pass ripple) filter or Chebyshev type II (stop-band ripple) filter.  
En complément des filtres Butterworth, maintenant vous pouvez utiliser des filtres IIR du type Chebyshev type I (band-pass ripple) ou Chebyshev type II (stop-band ripple).  


The Butterworth filter has flat response in both the pass band and stop band, but its transition band is wide.  
Le filtre Butterworth a une réponse plate en passe-bande et coupe-bande mais sa bande de transition est large.  


The Chebyshev type I (band-pass ripple filter) has the steepest roll-off among the three filters, and its response in the stop band is flat. However, it has ripples in the pass band.  
The Chebyshev type I (band-pass ripple filter) has the steepest roll-off among the three filters, and its response in the stop band is flat. However, it has ripples in the pass band.  
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