Patents by Inventor Nitin Kwatra
Nitin Kwatra 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: 11956360Abstract: A node in a blockchain network may generate a secret information proof, generate a private/public key pair, encrypt the secret information proof with the private/public key pair, and submit the proof to a blockchain network.Type: GrantFiled: June 15, 2021Date of Patent: April 9, 2024Assignee: International Business Machines CorporationInventors: Petr Novotny, Shikhar Kwatra, Nitin Gaur, Matthias Seul
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Patent number: 11863948Abstract: An acoustic signal processing system and method includes classification technology to classify a relationship between at least two sound components of a received sound signal. The exemplary sound components are ambient noise and localized noise. The classification technology dynamically determines a classification value that represents the relationship between the sound components and processes the sound signal in accordance with the acoustic signal classification to modify the sound signal. In at least one embodiment, dynamic classification of the relationship between sound components in a sound signal and responsive signal processing improve performance of systems, such as an active noise cancellation (ANC) system, by, for example, attenuating at least one of the sound components and/or enhancing at least one of the sound components. In an ANC system context, the sound components generally include noise components such as ambient noise and noise localized to a microphone.Type: GrantFiled: April 15, 2019Date of Patent: January 2, 2024Assignee: Cirrus Logic International Semiconductor Ltd.Inventors: Nitin Kwatra, Jeffrey D. Alderson
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Publication number: 20220245074Abstract: Calibrating devices communicating on the shared bus can assist in reducing conflicts on the bus and the resulting loss of data. For example, the timing of transmission of data from one device to another device on the shared bus may be adjusted to compensate for delays on the shared bus. For example, the transmitting device may adjust transmission to an earlier time than the programmed time by an amount proportional to a known delay, such that the signal arrives at a receiving device at the programmed time. When the adjustment is not able to obtain a desired alignment or would cause conflicts on the shared data bus, the timing may be adjusted to delay the transmission, rather than advance the transmission, such that the adjusted transmission time results in the receipt of the signal at the receiving device in an unused time window after the programmed time.Type: ApplicationFiled: February 3, 2021Publication date: August 4, 2022Applicant: Cirrus Logic International Semiconductor Ltd.Inventor: Nitin Kwatra
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Patent number: 11392520Abstract: Calibrating devices communicating on the shared bus can assist in reducing conflicts on the bus and the resulting loss of data. For example, the timing of transmission of data from one device to another device on the shared bus may be adjusted to compensate for delays on the shared bus. For example, the transmitting device may adjust transmission to an earlier time than the programmed time by an amount proportional to a known delay, such that the signal arrives at a receiving device at the programmed time. When the adjustment is not able to obtain a desired alignment or would cause conflicts on the shared data bus, the timing may be adjusted to delay the transmission, rather than advance the transmission, such that the adjusted transmission time results in the receipt of the signal at the receiving device in an unused time window after the programmed time.Type: GrantFiled: February 3, 2021Date of Patent: July 19, 2022Assignee: Cirrus Logic, Inc.Inventor: Nitin Kwatra
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Patent number: 10810990Abstract: An active noise cancellation (ANC) system including a selectable decimation rate decimator that receives an oversampled digital input and has an input that selects the decimation rate, a filter that receives an output of the decimator, and a selectable interpolation rate interpolator that receives an output of the filter and has an input that selects the interpolation rate. The selectable decimation rate decimator and the selectable interpolation rate interpolator operate to provide a selectable sample rate for the filter based on the selected decimation and interpolation rates. The filter may be an anti-noise filter, feedback filter, and/or a filter that models an acoustic transfer function of the ANC system. Rate selection may be static, or dynamically controlled based on battery or ambient noise level. A ratio of the decimation rate and the interpolation rate is fixed independent of the dynamically controlled decimation and interpolation rates.Type: GrantFiled: January 30, 2019Date of Patent: October 20, 2020Assignee: Cirrus Logic, Inc.Inventors: Gabriel Vogel, Jeffrey Alderson, Ryan A. Hellman, Nitin Kwatra
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Patent number: 10468048Abstract: A personal audio device, such as a wireless telephone, includes noise canceling circuit that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone may also be provided proximate the speaker to estimate an electro-acoustical path from the noise canceling circuit through the transducer. A processing circuit uses the reference and/or error microphone, optionally along with a microphone provided for capturing near-end speech, to determine whether one of the reference or error microphones is obstructed by comparing their received signal content and takes action to avoid generation of erroneous anti-noise.Type: GrantFiled: December 22, 2014Date of Patent: November 5, 2019Assignee: CIRRUS LOGIC, INC.Inventors: Nitin Kwatra, Jeffrey Alderson, Jon D. Hendrix
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Publication number: 20190237058Abstract: An active noise cancellation (ANC) system including a selectable decimation rate decimator that receives an oversampled digital input and has an input that selects the decimation rate, a filter that receives an output of the decimator, and a selectable interpolation rate interpolator that receives an output of the filter and has an input that selects the interpolation rate. The selectable decimation rate decimator and the selectable interpolation rate interpolator operate to provide a selectable sample rate for the filter based on the selected decimation and interpolation rates. The filter may be an anti-noise filter, feedback filter, and/or a filter that models an acoustic transfer function of the ANC system. Rate selection may be static, or dynamically controlled based on battery or ambient noise level. A ratio of the decimation rate and the interpolation rate is fixed independent of the dynamically controlled decimation and interpolation rates.Type: ApplicationFiled: January 30, 2019Publication date: August 1, 2019Inventors: GABRIEL VOGEL, JEFFREY ALDERSON, RYAN A. HELLMAN, NITIN KWATRA
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Patent number: 10249284Abstract: A personal audio device, such as a wireless telephone, includes noise canceling that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is provided proximate the speaker to measure the output of the transducer in order to control the adaptation of the anti-noise signal and to estimate an electro-acoustical path from the noise canceling circuit through the transducer. The anti-noise signal is adaptively generated to minimize the ambient audio sounds at the error microphone. A processing circuit that performs the adaptive noise canceling (ANC) function also filters one or both of the reference and/or error microphone signals, to bias the adaptation of the adaptive filter in one or more frequency regions to alter a degree of the minimization of the ambient audio sounds at the error microphone.Type: GrantFiled: October 18, 2017Date of Patent: April 2, 2019Assignee: CIRRUS LOGIC, INC.Inventors: Nitin Kwatra, Ali Abdollahzadeh Milani, Jeffrey Alderson
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Patent number: 10152960Abstract: An integrated circuit may include an output for providing a signal to a transducer including both source audio for playback to a listener and an anti-noise signal for countering the effects of ambient audio sounds in an acoustic output of the transducer, a microphone input for receiving a microphone signal indicative of ambient sounds at the transducer, a link control input for receiving link control information of a communications link coupling the integrated circuit to the transducer and/or a microphone for generating the microphone signal, wherein the link control information includes a link quality metric of the communications link, and a processing circuit comprising a filter having a response that generates the anti-noise signal in conformity with the microphone signal to minimize the ambient sounds at the acoustic output of the transducer, wherein the processing circuit modifies generation of the anti-noise signal responsive to the link quality metric.Type: GrantFiled: February 25, 2016Date of Patent: December 11, 2018Assignee: Cirrus Logic, Inc.Inventors: Jon D. Hendrix, Nitin Kwatra, Jeffrey D. Alderson
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Systems and methods for adaptive active noise cancellation for multiple-driver personal audio device
Patent number: 10013966Abstract: In accordance with embodiments of the present disclosure, a processing circuit may implement an adaptive filter, a first signal injection portion which injects a first additional signal into a first frequency range content source audio signal, and a second signal injection portion which injects a second additional signal into a second frequency range content source audio signal, wherein the first additional signal and the second additional signal are substantially different.Type: GrantFiled: March 15, 2016Date of Patent: July 3, 2018Assignee: Cirrus Logic, Inc.Inventors: Nitin Kwatra, Jon D. Hendrix, John L. Melanson -
Publication number: 20180040315Abstract: A personal audio device, such as a wireless telephone, includes noise canceling that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is provided proximate the speaker to measure the output of the transducer in order to control the adaptation of the anti-noise signal and to estimate an electro-acoustical path from the noise canceling circuit through the transducer. The anti-noise signal is adaptively generated to minimize the ambient audio sounds at the error microphone. A processing circuit that performs the adaptive noise canceling (ANC) function also filters one or both of the reference and/or error microphone signals, to bias the adaptation of the adaptive filter in one or more frequency regions to alter a degree of the minimization of the ambient audio sounds at the error microphone.Type: ApplicationFiled: October 18, 2017Publication date: February 8, 2018Inventors: Nitin Kwatra, Ali Abdollahzadeh Milani, Jeffrey Alderson
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Patent number: 9824677Abstract: A personal audio device, such as a wireless telephone, includes noise canceling that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is provided proximate the speaker to measure the output of the transducer in order to control the adaptation of the anti-noise signal and to estimate an electro-acoustical path from the noise canceling circuit through the transducer. The anti-noise signal is adaptively generated to minimize the ambient audio sounds at the error microphone. A processing circuit that performs the adaptive noise canceling (ANC) function also filters one or both of the reference and/or error microphone signals, to bias the adaptation of the adaptive filter in one or more frequency regions to alter a degree of the minimization of the ambient audio sounds at the error microphone.Type: GrantFiled: May 16, 2012Date of Patent: November 21, 2017Assignee: CIRRUS LOGIC, INC.Inventors: Nitin Kwatra, Ali Abdollahzadeh Milani, Jeffrey Alderson
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SYSTEMS AND METHODS FOR ADAPTIVE ACTIVE NOISE CANCELLATION FOR MULTIPLE-DRIVER PERSONAL AUDIO DEVICE
Publication number: 20170270906Abstract: In accordance with embodiments of the present disclosure, a processing circuit may implement an adaptive filter, a first signal injection portion which injects a first additional signal into a first frequency range content source audio signal, and a second signal injection portion which injects a second additional signal into a second frequency range content source audio signal, wherein the first additional signal and the second additional signal are substantially different.Type: ApplicationFiled: March 15, 2016Publication date: September 21, 2017Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Nitin Kwatra, Jon D. Hendrix, John L. Melanson -
Patent number: 9711130Abstract: A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from a reference microphone signal that measures the ambient audio and an error microphone signal that measures the output of an output transducer plus any ambient audio at that location and injects the anti-noise signal at the transducer output to cause cancellation of ambient audio sounds. A processing circuit uses the reference and error microphone to generate the anti-noise signal, which can be generated by an adaptive filter operating at a multiple of the ANC coefficient update rate. Downlink audio can be combined with the high data rate anti-noise signal by interpolation. High-pass filters in the control paths reduce DC offset in the ANC circuits, and ANC coefficient adaptation can be halted when downlink audio is not detected.Type: GrantFiled: April 15, 2016Date of Patent: July 18, 2017Assignee: CIRRUS LOGIC, INC.Inventors: Jon D. Hendrix, Gautham Devendra Kamath, Nitin Kwatra, Ali Abdollahzadeh Milani, Jeffrey Alderson
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Patent number: 9704472Abstract: Systems and methods of the present disclosure include analyzing and comparing transfer functions associated with a plurality of electro-acoustic paths for transducers of a personal audio device to determine proximity of the transducers to respective ears of a listener of the personal audio device, quality of acoustic seals associated with the transducers, and for one or more other purposes.Type: GrantFiled: December 10, 2013Date of Patent: July 11, 2017Assignee: Cirrus Logic, Inc.Inventor: Nitin Kwatra
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Patent number: 9633646Abstract: A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is also provided proximate the speaker to measure the ambient sounds and transducer output near the transducer, thus providing an indication of the effectiveness of the noise canceling. A processing circuit uses the reference and/or error microphone, optionally along with a microphone provided for capturing near-end speech, to determine whether the ANC circuit is incorrectly adapting or may incorrectly adapt to the instant acoustic environment and/or whether the anti-noise signal may be incorrect and/or disruptive and then take action in the processing circuit to prevent or remedy such conditions.Type: GrantFiled: August 31, 2015Date of Patent: April 25, 2017Assignee: CIRRUS LOGIC, INCInventors: Jon D. Hendrix, Ali Abdollahzadeh Milani, Nitin Kwatra, Dayong Zhou, Yang Lu, Jeffrey Alderson
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Publication number: 20170084263Abstract: An integrated circuit may include an output for providing a signal to a transducer including both source audio for playback to a listener and an anti-noise signal for countering the effects of ambient audio sounds in an acoustic output of the transducer, a microphone input for receiving a microphone signal indicative of ambient sounds at the transducer, a link control input for receiving link control information of a communications link coupling the integrated circuit to the transducer and/or a microphone for generating the microphone signal, wherein the link control information includes a link quality metric of the communications link, and a processing circuit comprising a filter having a response that generates the anti-noise signal in conformity with the microphone signal to minimize the ambient sounds at the acoustic output of the transducer, wherein the processing circuit modifies generation of the anti-noise signal responsive to the link quality metric.Type: ApplicationFiled: February 25, 2016Publication date: March 23, 2017Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Jon D. Hendrix, Nitin Kwatra, Jeffrey D. Alderson
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Publication number: 20170053638Abstract: In accordance with systems and methods of the present disclosure, an adaptive noise cancellation system may include an alignment filter configured to correct misalignment of a reference microphone signal and an error microphone signal by generating a misalignment correction signal.Type: ApplicationFiled: August 21, 2015Publication date: February 23, 2017Inventors: Dayong Zhou, Yang Lu, Ning Li, Nitin Kwatra, Antonio J. Miller
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Patent number: 9578415Abstract: In accordance with systems and methods of the present disclosure, an adaptive noise cancellation system may include an alignment filter configured to correct misalignment of a reference microphone signal and an error microphone signal by generating a misalignment correction signal.Type: GrantFiled: August 21, 2015Date of Patent: February 21, 2017Assignee: Cirrus Logic, Inc.Inventors: Dayong Zhou, Yang Lu, Ning Li, Nitin Kwatra, Antonio J. Miller
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Publication number: 20160365084Abstract: In accordance with embodiments of the present disclosure, a hybrid finite impulse response filter having a plurality of delay stages comprising a first filter portion and a second filter portion. In some embodiments, the first filter portion may be a high-rate filter portion associated with a first portion of the plurality of delay stages and configured to filter an input signal having a first sampling rate to generate a first intermediate output signal and the second portion may be a low-rate filter portion associated with a second portion of the plurality of delay stages and configured to filter a downsampled version of the input signal at a second sampling rate to generate a second intermediate output signal.Type: ApplicationFiled: June 9, 2015Publication date: December 15, 2016Inventors: Jeffrey D. Alderson, John L. Melanson, Nitin Kwatra, Ryan A. Hellman