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Expired Canadian patentCanada

Method and apparatus for continuous time-variant digital filtering

CA 1265212 C · Owner: Amoco Corporation · Inventors: Peacock, Kenneth L.

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Abstract From the Canadian patent

A continuous time-variant digital filtering method and apparatus are provided. In particular a, method for continuous time-variant digital filtering of a digitized signal comprises the steps of windowing the input digitized signal into discrete windows. For each discrete window of the input digitized signal an autocor-, relation matrix is determined. Thereafter a filter coef-, ficient matrix for each window of the input digitized signal is determined from the autocorrelation matrix. Corresponding filter coefficients from each filter coefficient matrix and window of the input digitized signals are sequentially collected and interpolated for each sample point of the input digital signal to …

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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.

Why it's free to use

  • Granted January 30, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 30, 2007.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 16, 1987
GrantedJanuary 30, 1990
Term endedJanuary 30, 2007
Patent numberCA 1265212 C
Classification (IPC)G01V1/38 +2 more

Timeline

Timeline From CIPO dates

1988199019921994199619982000200220042006Application filedDec 16, 1987Patent grantedJan 30, 1990Term endedJan 30, 2007

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.