Patents by Inventor Casey L. Hardy

Casey L. Hardy 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).

  • Time-division multiplexed data bus interface
    Patent number: 10146732
    Abstract: An audio system bus has a bus data line and a bus clock line. Audio producers are coupled to the bus to form a time-division multiplexed multi drop bus interface arrangement having protocol slots 0, 1, . . . N where N is an integer greater than two. A bus device is coupled to the bus that produces a) a frame marker on the bus data line in slot 0, and b) a data bit on the bus data line in slot 1. The audio producers are to produce their respective audio data bits in their assigned slots other than slots 0 and 1. Other embodiments are also described and claimed.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: December 4, 2018
    Assignee: Apple Inc.
    Inventors: Girault W. Jones, Nathan A. Johanningsmeier, Casey L. Hardy
  • Audio power amplification with reduced input power supply crest factor
    Patent number: 9231543
    Abstract: A power converter has an output that is coupled in parallel with an energy reservoir circuit and a power supply node of an audio power amplifier. The converter can set an upper limit on its input supply current that is variable in accordance with a control input. A controller is to produce a signal, coupled to the control input of the power converter, that is responsive to a measure of input supply voltage of the power converter and either output voltage of the power converter or output power of the amplifier. Other embodiments are also described and claimed.
    Type: Grant
    Filed: January 13, 2014
    Date of Patent: January 5, 2016
    Assignee: Apple Inc.
    Inventors: Roderick Hogan, Joseph J. Curcio, Nathan A. Johanningsmeier, Casey L. Hardy
  • AUDIO POWER AMPLIFICATION WITH REDUCED INPUT POWER SUPPLY CREST FACTOR
    Publication number: 20150200640
    Abstract: A power converter has an output that is coupled in parallel with an energy reservoir circuit and a power supply node of an audio power amplifier. The converter can set an upper limit on its input supply current that is variable in accordance with a control input. A controller is to produce a signal, coupled to the control input of the power converter, that is responsive to a measure of input supply voltage of the power converter and either output voltage of the power converter or output power of the amplifier. Other embodiments are also described and claimed.
    Type: Application
    Filed: January 13, 2014
    Publication date: July 16, 2015
    Applicant: APPLE INC.
    Inventors: RODERICK HOGAN, JOSEPH J. CURCIO, NATHAN A. JOHANNINGSMEIER, CASEY L. HARDY
  • TIME-DIVISION MULTIPLEXED DATA BUS INTERFACE
    Publication number: 20140207983
    Abstract: An audio system bus has a bus data line and a bus clock line. Audio producers are coupled to the bus to form a time-division multiplexed multi drop bus interface arrangement having protocol slots 0,1, . . . N where N is an integer greater than two. A bus device is coupled to the bus that produces a) a frame marker on the bus data line in slot 0, and b) a data bit on the bus data line in slot 1. The audio producers are to produce their respective audio data bits in their assigned slots other than slots 0 and 1. Other embodiments are also described and claimed.
    Type: Application
    Filed: January 22, 2013
    Publication date: July 24, 2014
    Applicant: Apple Inc.
    Inventors: Girault W. Jones, Nathan A. Johanningsmeier, Casey L. Hardy