Patents by Inventor Jason P. Rhode

Jason P. Rhode 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).

  • Patent number: 11900730
    Abstract: A method of biometric identification of a person comprises, during an enrolment phase determining at least one enrolment transfer function for bone conduction of an audio signal through an enrolling user's head. The enrolment transfer function is stored. During a verification phase, at least one verification transfer function for bone conduction of an audio signal through the person's head is determined. It is then determined from the at least one verification transfer function and the at least one enrolment transfer function whether the person is the enrolling user.
    Type: Grant
    Filed: October 8, 2020
    Date of Patent: February 13, 2024
    Assignee: Cirrus Logic Inc.
    Inventors: John P. Lesso, Jason P. Rhode
  • Publication number: 20210192244
    Abstract: A method of biometric identification of a person comprises, during an enrolment phase determining at least one enrolment transfer function for bone conduction of an audio signal through an enrolling user's head. The enrolment transfer function is stored. During a verification phase, at least one verification transfer function for bone conduction of an audio signal through the person's head is determined. It is then determined from the at least one verification transfer function and the at least one enrolment transfer function whether the person is the enrolling user.
    Type: Application
    Filed: October 8, 2020
    Publication date: June 24, 2021
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: John P. LESSO, Jason P. RHODE
  • Patent number: 8447050
    Abstract: A thermal sensor at the output of a switching amplifier senses heat dissipation at the output switch. If an overheating condition is sensed, gain of the digital input signal is lowered to reduce output power of the audio output signal.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: May 21, 2013
    Assignee: Cirrus Logic, Inc.
    Inventors: John L. Melanson, Xiaofan Fei, Johann G. Gaboriau, Steven Green, Jason P. Rhode, Eric Walburger, Wilson E. Taylor, Jr.
  • Publication number: 20110075723
    Abstract: A thermal sensor at the output of a switching amplifier senses heat dissipation at the output switch. If an overheating condition is sensed, gain of the digital input signal is lowered to reduce output power of the audio output signal.
    Type: Application
    Filed: October 21, 2010
    Publication date: March 31, 2011
    Inventors: John L. Melanson, Xiaofan Fei, Johann G. Gaboriau, Steven Green, Jason P. Rhode, Eric Walburger, Wilson E. Taylor, JR.
  • Patent number: 7840015
    Abstract: A thermal sensor at the output of a switching amplifier senses heat dissipation at the output switch. If an overheating condition is sensed, gain of the digital input signal is lowered to reduce output power of the audio output signal.
    Type: Grant
    Filed: September 4, 2002
    Date of Patent: November 23, 2010
    Assignee: Cirrus Logic, Inc.
    Inventors: John L. Melanson, Xiaofan Fei, Johann G. Gaboriau, Steven Green, Jason P. Rhode, Eric Walburger, Wilson E. Taylor, Jr.
  • Patent number: 7010131
    Abstract: A quasi-differential power amplifier and method are disclosed that enhance drive capability and dynamic range by driving a right, left and common terminals with a right channel output signal, a left channel output signal, and a common mode output signal that are each a combination of the left and right channel input signals. In addition, the common mode output signal may be used as feedback so that the left and right channel output signals so that these signals are dependent upon feedback from the common mode output signal. The quasi-differential power amplifier may include a first amplifier driving the left channel output signal, a second amplifier driving the right channel output signal, and a third amplifier driving the common mode output signal. In one application, the quasi-differential amplifier may be used to drive three-wire stereo headphones for use in small portable stereo systems.
    Type: Grant
    Filed: May 15, 1998
    Date of Patent: March 7, 2006
    Assignee: Cirrus Logic, Inc.
    Inventors: Jason P. Rhode, John J. Paulos
  • Patent number: 6853242
    Abstract: A gain control at the input monitors an input signal and a supply voltage, which drives an output. The gain control adjusts the gain to compress the input signal when the supply voltage decreases in magnitude and/or the input signal is of such magnitude to cause the supply voltage to decrease.
    Type: Grant
    Filed: June 14, 2004
    Date of Patent: February 8, 2005
    Assignee: Cirrus Logic, Inc.
    Inventors: John L. Melanson, Xiaofan Fei, Johann G. Gaboriau, Steven Green, Jason P. Rhode
  • Publication number: 20040222846
    Abstract: A gain control at the input monitors an input signal and a supply voltage, which drives an output. The gain control adjusts the gain to compress the input signal when the supply voltage decreases in magnitude and/or the input signal is of such magnitude to cause the supply voltage to decrease.
    Type: Application
    Filed: June 14, 2004
    Publication date: November 11, 2004
    Inventors: John L. Melanson, Xiaofan Fei, Johann G. Gaboriau, Steven Green, Jason P. Rhode
  • Patent number: 6765436
    Abstract: A gain control at the input monitors an input signal and a supply voltage, which drives an output. The gain control adjusts the gain to compress the input signal when the supply voltage decreases in magnitude and/or the input signal is of such magnitude to cause the supply voltage to decrease.
    Type: Grant
    Filed: September 4, 2002
    Date of Patent: July 20, 2004
    Assignee: Cirrus Logic, Inc.
    Inventors: John L. Melanson, Xiaofan Fei, Johann G. Gaboriau, Steven Green, Jason P. Rhode
  • Patent number: 6531975
    Abstract: An apparatus and method for converting digital input signals sampled at different rates to analog signals includes a digital to analog converter for each digital input signal. Each digital to analog converter receives a digital input signal and a clock signal corresponding to the sampling rate of the received digital input signal. The apparatus can also receive a set of sample rate signals indicating the sampling rate for each digital input signal. The sample rate signals are used to route each digital input signal, along with a corresponding clock signal, to a corresponding digital to analog converter (DAC). A clock error signal controls routing of the digital input signals to the DACs as well as operation of the DACs. A clock divider and ratio detector module generates the clock error signal based on intermediate clock error signals that correspond to the sample rates.
    Type: Grant
    Filed: May 24, 2001
    Date of Patent: March 11, 2003
    Assignee: Cirrus Logic, Incorporated
    Inventors: Brian D. Trotter, Thomas D. Stein, Heling Yi, Jason P. Rhode, Timothy T. Rueger
  • Patent number: 6522278
    Abstract: Power-up and power-down transient suppression are provided for an audio digital-to-analog converter with a single ended output to prevent annoying pops which accompany switching an audio system on and off. Power-up suppression is achieved by driving the output of a pulse-width circuit to a reference level such as around, and driving the pulse-width circuit gradually to its quiescent (zero signal) value. Power-down suppression is provided by using a positive feedback amplifier to accelerate current drain initiated by a constant current source used to bleed off the charge on output capacitor. The techniques disclosed apply readily to the outputs received from CDs, CD-ROMs, DAT and other digital recording media.
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: February 18, 2003
    Assignee: Cirrus Logic, Inc.
    Inventors: Jason P. Rhode, Johann G. Gaboriau, Xiaofan Fei
  • Patent number: 6492928
    Abstract: Power-up and power-down transient suppression are provided for an audio digital-to-analog converter with a single ended output to prevent annoying pops which accompany switching an audio system on and off. Power-up suppression is achieved by clamping an output signal to ground, driving the audio channel to ground, releasing the clamp and driving the audio channel gradually to its quiescent (zero signal) value. Power-down suppression is provided by using a positive feedback amplifier to accelerate current drain initiated by a constant current source used to bleed off the charge on output capacitor. The audio digital-to-analog converter sets operational mode based on ratios of a master clock to a channel selection clock. The techniques disclosed apply readily to the outputs received from CDs, CD-ROMs, DAT and other digital recording media.
    Type: Grant
    Filed: July 18, 2001
    Date of Patent: December 10, 2002
    Assignee: Cirrus Logic, Inc.
    Inventors: Jason P. Rhode, John J. Paulos, Andrew W. Krone, Richard Bocock
  • Patent number: 6281821
    Abstract: Power-up and power-down transient suppression are provided for an audio digital-to-analog converter with a single ended output to prevent annoying pops which accompany switching an audio system on and off. Power-up suppression is achieved by clamping an output signal to ground, driving the audio channel to ground, releasing the clamp and driving the audio channel gradually to its quiescent (zero signal) value. Power-down suppression is provided by using a positive feedback amplifier to accelerate current drain initiated by a constant current source used to bleed off the charge on output capacitor. The audio digital-to-analog converter sets operational mode based on ratios of a master clock to a channel selection clock.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: August 28, 2001
    Inventors: Jason P. Rhode, John J. Paulos, Andrew W. Krone, Richard Bocock