MLchartDataset catalogue

Alias filter

Term · Oil and gas · MLC-T-OAG-000090

An electronic filter applied to a seismic signal before it is digitized to remove frequencies higher than the Nyquist frequency. Removing these high frequencies prevents them from being incorrectly represented as lower frequencies in the sampled data, a phenomenon known as aliasing. The filter's cutoff is set below half the sampling rate; for a 2-millisecond sample interval, the Nyquist frequency is 250 Hz, so the filter would cut frequencies above that point.

Table 1. Record
IdentifierMLC-T-OAG-000090
FieldOil and gas
SubjectGeophysics
Record as JSON 
{
  "id": "MLC-T-OAG-000090",
  "term": "Alias filter",
  "field": "Oil and gas",
  "definition": "An electronic filter applied to a seismic signal before it is digitized to remove frequencies higher than the Nyquist frequency. Removing these high frequencies prevents them from being incorrectly represented as lower frequencies in the sampled data, a phenomenon known as aliasing. The filter's cutoff is set below half the sampling rate; for a 2-millisecond sample interval, the Nyquist frequency is 250 Hz, so the filter would cut frequencies above that point.",
  "subject": "Geophysics",
  "url": "https://mlchart.com/terminology/oil-and-gas/alias-filter/"
}

Record 103 of 4,469 in Oil and gas terminology (MLC-0103). Request the full dataset.