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Expired Canadian patentCanada

Head diffraction compensated stereo system

CA 1297417 C · Owner: Bauck, Jerald L. · Inventors: Cooper, Duane H.; Bauck, Jerald L.

CIPO record

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Abstract From the Canadian patent

Abstract of the Disclosure, A stereo audio processing system for a stereo audio signal processing reproduction that provides improved source imaging and simulation of desired listening environment acoustics while retaining relative independence of listener movement. The system first utilizes a synthetic or artificial head microphone pickup and utilizes the results as inputs to a cross-talk cancellation and naturalization compensation circuit utilizing minimum phase filter circuits to adapt the head diffraction compensated signals for use as loudspeaker signals. The system provides for head diffraction compensation including cross-coupling while permitting listener movement by limiting the …

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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 March 17, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 17, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 14, 1988
GrantedMarch 17, 1992
Term endedMarch 17, 2009
Patent numberCA 1297417 C
Classification (IPC)H04R5/04 +1 more

Timeline

Timeline From CIPO dates

1989199219951998200120042007Application filedOct 14, 1988Patent grantedMarch 17, 1992Term endedMarch 17, 2009

Sources & verification

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