Patents Assigned to CDF Industries, Inc.
  • Masking noise generator
    Patent number: 4054751
    Abstract: There is disclosed a masking noise generator which includes a digital means such as a shift register for generating noise signals wherein the output of the shift register is fed via a filtering means to a transducer means such as a speaker for converting the noise signals to acoustic waves.
    Type: Grant
    Filed: March 1, 1976
    Date of Patent: October 18, 1977
    Assignee: CDF Industries, Inc.
    Inventors: George Donald Calder, John Duda, John Fatovic