Patents by Inventor Jeffrey Donald Alderson
Jeffrey Donald Alderson 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).
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Patent number: 8477248Abstract: A system and method for demodulating signals are disclosed. In a particular embodiment, the method includes receiving a signal at an input and determining a first noise estimate of the signal. The method also includes providing a first output indicating a second noise estimate of the signal at a primary carrier frequency and providing a second output indicating a third noise estimate of the signal at a secondary carrier frequency.Type: GrantFiled: July 9, 2007Date of Patent: July 2, 2013Assignee: Sigmatel, Inc.Inventors: Jon David Hendrix, Jeffrey Donald Alderson, Glen Ragan
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Patent number: 8102959Abstract: A digital audio processing system includes an input to receive a phase component of a signal. The digital audio processing system includes symbol recognition logic to adjust a sample of the phase component using an offset value. The symbol recognition logic maps the adjusted sample to a nearest predetermined phase value of a plurality of predetermined phase values. The symbol recognition logic determines a symbol using a difference between the nearest predetermined phase value and a prior nearest predetermined phase value. The prior nearest predetermined phase value corresponds to a prior sample of the phase component of the signal. The offset value is based on a detected error of the prior sample of the phase component of the signal. The digital audio processing system also includes an output to provide a second signal that indicates the symbol.Type: GrantFiled: April 22, 2011Date of Patent: January 24, 2012Assignee: Sigmatel, Inc.Inventors: Jeffrey Donald Alderson, Darrell Tinker, K. Gozie Ifesinachukwu
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Publication number: 20110194661Abstract: A digital audio processing system includes an input to receive a phase component of a signal. The digital audio processing system includes symbol recognition logic to adjust a sample of the phase component using an offset value. The symbol recognition logic maps the adjusted sample to a nearest predetermined phase value of a plurality of predetermined phase values. The symbol recognition logic determines a symbol using a difference between the nearest predetermined phase value and a prior nearest predetermined phase value. The prior nearest predetermined phase value corresponds to a prior sample of the phase component of the signal. The offset value is based on a detected error of the prior sample of the phase component of the signal. The digital audio processing system also includes an output to provide a second signal that indicates the symbol.Type: ApplicationFiled: April 22, 2011Publication date: August 11, 2011Applicant: SIGMATEL, INC.Inventors: Jeffrey Donald Alderson, Darrell Tinker, K. Gozie Ifesinachukwu
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Patent number: 7953196Abstract: A method includes receiving first data corresponding to a first signal sampled at a first sample rate, decimating the first data to provide a second signal sampled at a second sample rate, and recovering a pilot signal from the second signal. The method also includes evaluating the pilot signal to determine an error value, where the error value is based on a comparison of a sample of the pilot signal to zero. The method also includes adjusting the second sample rate based on the error value.Type: GrantFiled: September 30, 2010Date of Patent: May 31, 2011Assignee: Sigmatel, Inc.Inventors: Jeffrey Donald Alderson, Darrell Tinker, K. Gozie Ifesinachukwu
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Publication number: 20110022649Abstract: A method includes receiving first data corresponding to a first signal sampled at a first sample rate, decimating the first data to provide a second signal sampled at a second sample rate, and recovering a pilot signal from the second signal. The method also includes evaluating the pilot signal to determine an error value, where the error value is based on a comparison of a sample of the pilot signal to zero. The method also includes adjusting the second sample rate based on the error value.Type: ApplicationFiled: September 30, 2010Publication date: January 27, 2011Applicant: SIGMATEL, INC.Inventors: Jeffrey Donald Alderson, Darrell Tinker, K. Gozie Ifesinachukwu
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Patent number: 7831001Abstract: A digital audio processing system and method is disclosed. In an embodiment, the digital audio processing system can include a phase detector to sample an input signal and provide an output to adjust a decimation rate of an input signal. In another embodiment, the digital audio processing system can include symbol recognition logic to determine a symbol using a difference between a nearest predetermined phase value to a sample and a nearest predetermined phase value to a prior sample.Type: GrantFiled: December 19, 2006Date of Patent: November 9, 2010Assignee: Sigmatel, Inc.Inventors: Jeffrey Donald Alderson, Darrell Tinker, K. Gozie Ifesinachukwu
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Patent number: 7792220Abstract: A demodulator system and method is disclosed. In an embodiment, the demodulator system can include a Coordinate Rotation Digital Computer (CORDIC) mixer to mix a first signal substantially to baseband using a first input frequency and to mix a second signal substantially to baseband using a second input frequency. In another embodiment, the demodulator system can include a phase detector to receive a pilot signal and to generate a control signal to adjust a decimation rate based on the pilot signal. In another embodiment, the demodulator system can include a symbol decoder to determine a symbol from a phase signal.Type: GrantFiled: December 19, 2006Date of Patent: September 7, 2010Assignee: Sigmatel, Inc.Inventors: Jeffrey Donald Alderson, Darrell Tinker, K. Gozie Ifesinachukwu
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Patent number: 7774079Abstract: A system and method for decoding a received television signal is disclosed. The system includes an input to receive a digital audio signal and a digital variable deemphasis module to modify the amplitude of the digital audio signal based on a plurality of variable coefficients. The system also includes an exponential digital root mean square (ERMS) detector to provide level detection of the digital audio signal. The plurality of variable coefficients of the digital variable deemphasis module are digitally computed based on an output of the digital ERMS detector.Type: GrantFiled: October 3, 2005Date of Patent: August 10, 2010Assignee: Sigmatel, Inc.Inventor: Jeffrey Donald Alderson
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Patent number: 7577419Abstract: A digital mixer system and method is disclosed. In an embodiment, a digital mixer can receive a modulated signal having a sample rate approximately equal to a clock rate divided by an integer factor. The digital mixer can include a first mixing stage having a first plurality of Coordinate Rotation Digital Computer (CORDIC) elements to serially perform a predetermined number of consecutive CORDIC iterations per clock cycle. The first mixing stage can further have logic to selectively process data received from an output of the first mixing stage. The digital mixer can also include a second mixing stage having a second plurality of CORDIC elements to serially perform a number of consecutive CORDIC iterations per clock cycle. The second mixing stage can also have logic to selectively process data received from an output of the first mixing stage and from an output of the second mixing stage.Type: GrantFiled: December 19, 2006Date of Patent: August 18, 2009Assignee: Sigmatel, Inc.Inventor: Jeffrey Donald Alderson
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Patent number: 7518661Abstract: A system and method for detecting a mode of an audio signal is disclosed. The system includes an integrated circuit with an input to receive a signal and an audio processor coupled to the input. The audio processor includes an audio standard detection module, wherein the audio standard detection module detects a characteristic of the received signal that identifies a television audio standard by measuring the energy level of a plurality of different frequency bands of the received signal.Type: GrantFiled: September 30, 2005Date of Patent: April 14, 2009Assignee: Sigmatel, Inc.Inventor: Jeffrey Donald Alderson
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Publication number: 20090015714Abstract: A system and method for demodulating signals are disclosed. In a particular embodiment, the method includes receiving a signal at an input and determining a first noise estimate of the signal. The method also includes providing a first output indicating a second noise estimate of the signal at a primary carrier frequency and providing a second output indicating a third noise estimate of the signal at a secondary carrier frequency.Type: ApplicationFiled: July 9, 2007Publication date: January 15, 2009Applicant: SIGMATEL, INC.Inventors: Jon David Hendrix, Jeffrey Donald Alderson, Glen Ragan
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Publication number: 20080144743Abstract: A demodulator system and method is disclosed. In an embodiment, the demodulator system can include a Coordinate Rotation Digital Computer (CORDIC) mixer to mix a first signal substantially to baseband using a first input frequency and to mix a second signal substantially to baseband using a second input frequency. In another embodiment, the demodulator system can include a phase detector to receive a pilot signal and to generate a control signal to adjust a decimation rate based on the pilot signal. In another embodiment, the demodulator system can include a symbol decoder to determine a symbol from a phase signal.Type: ApplicationFiled: December 19, 2006Publication date: June 19, 2008Applicant: SIGMATEL, INC.Inventors: Jeffrey Donald Alderson, Darrell Tinker, K. Gozie Ifesinachukwu
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Publication number: 20080147762Abstract: A digital audio processing system and method is disclosed. In an embodiment, the digital audio processing system can include a phase detector to sample an input signal and provide an output to adjust a decimation rate of an input signal. In another embodiment, the digital audio processing system can include symbol recognition logic to determine a symbol using a difference between a nearest predetermined phase value to a sample and a nearest predetermined phase value to a prior sample.Type: ApplicationFiled: December 19, 2006Publication date: June 19, 2008Applicant: SIGMATEL, INC.Inventors: Jeffrey Donald Alderson, Darrell Tinker, K. Gozie Ifesinachukwu
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Publication number: 20080144740Abstract: A digital mixer system and method is disclosed. In an embodiment, a digital mixer can receive a modulated signal having a sample rate approximately equal to a clock rate divided by an integer factor. The digital mixer can include a first mixing stage having a first plurality of Coordinate Rotation Digital Computer (CORDIC) elements to serially perform a predetermined number of consecutive CORDIC iterations per clock cycle. The first mixing stage can further have logic to selectively process data received from an output of the first mixing stage. The digital mixer can also include a second mixing stage having a second plurality of CORDIC elements to serially perform a number of consecutive CORDIC iterations per clock cycle. The second mixing stage can also have logic to selectively process data received from an output of the first mixing stage and from an output of the second mixing stage.Type: ApplicationFiled: December 19, 2006Publication date: June 19, 2008Applicant: SIGMATEL, INC.Inventor: Jeffrey Donald Alderson