{
  "url": "https://openlegislation.uk/eu-regulation-2009-631/annex/part-III/division-appendix+ii/division-2/division-2.3",
  "json_url": "https://openlegislation.uk/eu-regulation-2009-631/annex/part-III/division-appendix+ii/division-2/division-2.3.json",
  "legislation": "eur/2009/631",
  "legislation_title": "Commission Regulation (EC) No 631/2009 of 22 July 2009 laying down detailed rules for the implementation of Annex I to Regulation (EC) No 78/2009 of the European Parliament and of the Council on the type-approval of motor vehicles with regard to the protection of pedestrians and other vulnerable road users, amending Directive 2007/46/EC and repealing Directives 2003/102/EC and 2005/66/EC",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2009-631",
  "path": "annex/part/III/division/appendix+ii/division/2/division/2.3",
  "kind": "division",
  "number": "2.3",
  "heading": "Filter phase shifts and time delays for anti-aliasing filtering",
  "text": "Excessive analogue filtering shall be avoided, and all filters shall have sufficiently similar phase characteristics to ensure that time delay differences are within the required accuracy for the time measurement. Phase shifts are especially significant when measured variables are multiplied together to form new variables, because while amplitudes multiply, phase shifts and associated time delays add. Phase shifts and time delays are reduced by increasing fo. Whenever equations describing the pre-sampling filters are known, it is practical to remove their phase shifts and time delays by simple algorithms performed in the frequency domain.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2009/631/annex/part/III/division/appendix+ii/division/2/division/2.3",
    "retrieved_at": "2026-11-01T14:51:23.654247+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}