Patents by Inventor Peter Qvortrup

Peter Qvortrup 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).

  • Audio signal analog-to-digital converter utilizing a transformed-based input circuit
    Patent number: 7129872
    Abstract: An apparatus for converting an input analog audio signal into digital form including an analog-to-digital converter. An amplifier circuit and step-down transformer provide an interface for the input analog audio signal to the analog-to-digital converter. The step-down transformer includes a primary winding operably coupled to the amplifier circuit and a secondary winding operably coupled to the analog-to-digital converter. The amplifier circuit drives the primary winding with the input analog audio signal (or an amplified version thereof). The step-down transformer generates a stepped-down representation of the input analog audio signal at its secondary winding. Advantageously, the step-down transformer lowers the effective output impedance of the amplifier circuit, which reduces distortion in the audio analog input signal supplied to the analog-to-digital converter.
    Type: Grant
    Filed: May 25, 2005
    Date of Patent: October 31, 2006
    Assignee: Audio Note UK Ltd.
    Inventors: Peter Qvortrup, Andrew B. Grove