Patents by Inventor David Zepp

David Zepp 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).

  • POWER SUPPLY REJECTION FOR PULSE WIDTH MODULATED AMPLIFIERS AND AUTOMATIC GAIN CONTROL
    Publication number: 20070109050
    Abstract: A circuit according to the present invention improves the power supply rejection ratio for a pulse width modulated digital amplifier and can be used as a compressor and/or limiter, either in conjunction with an amplifier or independently. The circuit preferably operates by using voltage level translation to vary the amplitude of a triangle wave in response to changes in power supply voltage prior to input of the wave into a comparator of the PWM device. Because the circuit operates to improve power supply rejection, little or no distortion is introduced into the signal when used as a compressor and/or limiter. Additionally, the circuit is optionally implemented in a Class D amplifier, and provides a lower cost of implementation than conventional designs in such implementations.
    Type: Application
    Filed: November 13, 2006
    Publication date: May 17, 2007
    Applicant: Altec Lansing Technologies, A Division of Plantronics, Inc.
    Inventor: David Zepp
  • Power supply rejection for pulse width modulated amplifiers and automatic gain control
    Patent number: 7135922
    Abstract: A circuit according to the present invention improves the power supply rejection ratio for a pulse width modulated digital amplifier and can be used as a compressor and/or limiter. The circuit preferably operates by using voltage level translation to vary the amplitude of a triangle wave in response to changes in power supply voltage prior to input of the wave into a comparator of the PWM device. Because the circuit operates to improve power supply rejection, little or no distortion is introduced into the signal when used as a compressor and/or limiter. Additionally, the circuit is optionally implemented in a Class D amplifier, and provides a lower cost of implementation than conventional designs in such implementations.
    Type: Grant
    Filed: January 7, 2005
    Date of Patent: November 14, 2006
    Assignee: Altec Lansing Technologies, Inc.
    Inventor: David Zepp
  • Power supply rejection for pulse width modulated amplifiers and automatic gain control
    Publication number: 20050179489
    Abstract: A circuit according to the present invention improves the power supply rejection ratio for a pulse width modulated digital amplifier and can be used as a compressor and/or limiter. The circuit preferably operates by using voltage level translation to vary the amplitude of a triangle wave in response to changes in power supply voltage prior to input of the wave into a comparator of the PWM device. Because the circuit operates to improve power supply rejection, little or no distortion is introduced into the signal when used as a compressor and/or limiter. Additionally, the circuit is optionally implemented in a Class D amplifier, and provides a lower cost of implementation than conventional designs in such implementations.
    Type: Application
    Filed: January 7, 2005
    Publication date: August 18, 2005
    Applicant: Altec Lansing Technologies, Inc.
    Inventor: David Zepp