Patents Assigned to Tridar
  • Speakerphone with dynamic level discriminator
    Patent number: 4147892
    Abstract: In this speakerphone the peak value of the microphone output must be above the (variable threshold) average value to cause switching to transmit mode, thus providing dynamic compensation for ambient noise. In addition, a feedback path rapidly reduces the average value threshold if ambient noise such as a fan suddenly stops to cause the average value to be momentarily larger than the peak.
    Type: Grant
    Filed: January 30, 1978
    Date of Patent: April 3, 1979
    Assignee: Tridar
    Inventor: Eric M. Miller
  • Speakerphone
    Patent number: D256691
    Type: Grant
    Filed: January 30, 1978
    Date of Patent: September 2, 1980
    Assignee: Tridar
    Inventor: Hans R. Camenzind