U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Head mounted surround sound system

Patent 5661812 Issued on August 26, 1997. Estimated Expiration Date: Icon_subject November 21, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

3088997

3906160

Earphone construction
Patent #: 4110583
Issued on: 08/29/1978
Inventor: Lepper

Motion picture theater loudspeaker system
Patent #: 4569076
Issued on: 02/04/1986
Inventor: Holman

Head diffraction compensated stereo system with optimal equalization
Patent #: 4910779
Issued on: 03/20/1990
Inventor: Cooper, et al.

Three-dimensional sight and sound reproduction apparatus for individual use
Patent #: 4952024
Issued on: 08/28/1990
Inventor: Gale

Liquid crystal shutter system for stereoscopic and other applications
Patent #: 4967268
Issued on: 10/30/1990
Inventor: Lipton, et al.

Earphone spacer
Patent #: 4993074
Issued on: 02/12/1991
Inventor: Carroll

Head diffraction compensated stereo system
Patent #: 5136651
Issued on: 08/04/1992
Inventor: Cooper, et al.

Multi-channel sound simulation system
Patent #: 5265166
Issued on: 11/23/1993
Inventor: Madnick, et al.

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Inventors

Assignee

Application

No. 753259 filed on 11/21/1996

US Classes:

381/309, Stereo earphone381/27, Center channel381/74HEADPHONE CIRCUITS

Examiners

Primary: Kuntz, Curtis
Assistant: Mei, Xu

Attorney, Agent or Firm

Foreign Patent References

  • 0 284 286 A2 EP. 09/23/1988
  • 0 421 681 A2 EP. 10/23/1991
  • 0 549 836 EP 07/23/1993
  • 4241130 DE 12/23/1992
  • 0 424 1130 DE 06/23/1993
  • 53-23601 JP 03/23/1978
  • 55-077295 JP. 10/23/1980
  • 0116900 JP 07/23/1983
  • 2200000 JP 08/23/1990

International Class

H04R 005/00

Abstract

A head mounted surround sound virtual positioning system that includes a video recorder (200), which is operable to have disposed therein a tape (202), having a surround sound audio track associated therewith. The surround sound system is encoded on two channels, which are output to a Dolby.RTM. decoder (204), which is operable to extract the five surround sound system channels therefrom. The left front, left rear, right front and right rear channels are input to a virtual positioning system (264), which is operable to virtually position each of the speakers relative to the head of the listener (26). These signals are then combined with a combining circuit (268) to provide the virtual positioning of only two speaker lines (58) and (60), disposed adjacent the right and left ears of the listener (26). The speakers (58) and (60) are disposed on the head mounted system such that they are fixed relative to the ear of the listener and slightly forward of the ears and adjacent the head. The center speaker signal output of the decoder (204) is output from a separate external speaker (310).

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