Patents Assigned to Digitrax Inc.
  • Variable whistle pitch control for model train layouts
    Patent number: 6747579
    Abstract: New techniques are presented for providing proportional activation of model railroad functions with control keys. This permits for example a compact throttle device connected to a digital layout control system to provide for a “playable” or variable-pitch whistle sound effect where prior art was severely limited in providing this effect realistically. This invention allows multiple proportional keys in a cost-effective manner that is compatible with existing keyboard designs.
    Type: Grant
    Filed: May 7, 2001
    Date of Patent: June 8, 2004
    Assignee: Digitrax Inc.
    Inventor: Anthony J. Ireland