Granted Patent
Utility
US 5,890,107 · App. 08/679,578
Sound signal processing circuit which independently calculates left and right mask levels of sub-band sound samples
Inventor:
Yoshitaka Shibuya
Patented Case
View Patent ↗
Granted: Mar 30, 1999
Filed: Jul 15, 1996
Inventor
Yoshitaka Shibuya
Assignee (at issue)
NEC CORPORATION
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.