Patents by Inventor Do Q. Phiet

Do Q. Phiet has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4644530
    Abstract: Digital conference bridge for use with a plurality of telephones (#1 . . . #n) and arranged whereby in accordance with predetermined output conditions from the telephones, as existing from time to time during use of the telephones for communication therebetween, the output signal from one telephone is directed to the remainder of the telephones and the output signals of the remainder are suppressed. The bridge generates products x.sub.n .multidot.g.sub.n and x.sub.i .multidot.g.sub.i where x.sub.n and x.sub.i are instantaneous magnitudes of samples of all of the signals and of the selected signal respectively, and g.sub.n and g.sub.i are predetermined gain factors for all of the signals and for the selected signal respectively. A register (60) storing the value of "i", designating the presently selected telephone, is updated by a circuit including comparators (42,52) connected to a gate (44) whereby to surplant a selection of an existing value of "i" by a new value under the following conditions:x.sub.n .
    Type: Grant
    Filed: September 13, 1985
    Date of Patent: February 17, 1987
    Assignee: Australian Telecommunications Commission
    Inventor: Do Q. Phiet