Patents Assigned to Soundesign Corp.
  • Patent number: 4236088
    Abstract: A noise-free electronic switching circuit selects one of a pair of audio input signals in an audio system. Each input signal is connected by separate conductors to a single output terminal. The output terminals of two transistors are respectively connected between each conductor and ground. When a manually-operated switch is switched to a first operating condition, an exponentially increasing and an exponentially decreasing control voltage are respectively applied to the bases of a first and a second transistor. When the actuating switch is switched to a second operating condition, an exponentially decreasing and an exponentially increasing control voltage are respectively applied to the bases of the first and the second transistor. In either operating condition, one transistor is turned on and the other is turned off. Thus, only the selected audio signal is delivered to the output terminal; and the other non-selected audio signal is shorted to ground before reaching the output terminal.
    Type: Grant
    Filed: August 14, 1978
    Date of Patent: November 25, 1980
    Assignee: Soundesign Corp.
    Inventors: Harumi Horiuchi, Hideo Aoyagi
  • Patent number: D307680
    Type: Grant
    Filed: March 2, 1987
    Date of Patent: May 8, 1990
    Assignee: Soundesign Corp.
    Inventor: Saul E. Ashkenazi