Patents by Inventor Paavo T. Kousa

Paavo T. Kousa 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: 4807274
    Abstract: A telephone line quality testing system detects line echoes in the telephone connection between two subsystems in a message transmission system. The test for line echoes is performed while the two subsystems exchange identification data by transmitting DTMF signals in a predefined sequence. Each subsystem transmits a marker at the beginning of each DTMF transmission. This marker is constructed so that it can be distinguished, with absolute certainty, from any possible echo of the previous DTMF transmission by the other subsystem. In general, the marker includes at least one DTMF signal selected from the set of DTMF signals not included in the last X DTMF signals sent by the other subsystem. Each subsystem also generates an "Expected marker" that should precede the next DTMF transmission by the other subsystem. When receiving a DTMF transmission, each subsystem compares the initial DTMF signals received with the expected marker.
    Type: Grant
    Filed: February 1, 1988
    Date of Patent: February 21, 1989
    Assignee: Octel Communications Corporation
    Inventor: Paavo T. Kousa
  • Patent number: 4797672
    Abstract: A voice network security system is disclosed which provides improved security aspects in transmitting voice messages between remote locations for use in a business environment. The security aspects of the present invention serve to prevent unauthorized access to the transmitted messages.A microfiche appendix (A) of one microfiche and 41 frames is included as part of the specification (3 CFR 1.96b).
    Type: Grant
    Filed: September 4, 1986
    Date of Patent: January 10, 1989
    Assignee: Octel Communications Corp.
    Inventor: Paavo T. Kousa