Patents by Inventor Karl Ayukawa

Karl Ayukawa 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).

  • Amplitude controlled digital oscillator
    Patent number: 4315219
    Abstract: The digital oscillator includes a memory which stores 12 bit words representing sampling points of the analog waveform to be produced and a D/A multiplying converter which receives the bit words and converts them to an analog values, the amplitudes of which are controlled by a reference voltage. The analog output is monitored and compared to a stable reference source in order to generate the controlling reference voltage thus maintaining a constant amplitude digital oscillator output.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: February 9, 1982
    Assignee: Canadian Patents & Development Limited
    Inventors: David Rocheleau, Karl Ayukawa