Patents by Inventor Sai Ravi Teja PULUGURTHA
Sai Ravi Teja PULUGURTHA 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: 11335331Abstract: A system and method provides for multibeam keyword detection. A composite audio signal may include sound components. The system and method groups the sound components into subsets based on the angles of arrival of sound components. Keyword detectors evaluate each subset and determine whether a keyword is present.Type: GrantFiled: July 24, 2020Date of Patent: May 17, 2022Assignee: KNOWLES ELECTRONICS, LLC.Inventors: Harsha Rao, Malakapati Loka Nagendra Prasad, Hindupur Keerthi Sagar, Pratik Shah, Murali Mohan Deshpande, John Woodruff, Sai Ravi Teja Pulugurtha, Rohit Paturi
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Patent number: 10686942Abstract: A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that echo estimate from a microphone signal to output an echo cancelled signal, the gain control system comprising a monitoring unit configured to estimate an energy associated with an impulse response of an adaptive filter configured to generate the echo estimate from the far-end signal and a gain tuner configured to adjust an attenuation of at least one of the microphone signal and the far-end signal in dependence on the estimated energy.Type: GrantFiled: May 13, 2019Date of Patent: June 16, 2020Assignee: Imagination Technologies LimitedInventors: Senthil Kumar Mani, Gandhi Namani, Srinivas Akella, Sai Ravi Teja Pulugurtha
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Patent number: 10455325Abstract: A method for estimating directions of arrival of audio signals based on categories is disclosed herein. The method includes receiving an audio signal; generating a plurality of filters based on the audio signal, each of the filters corresponding to one of a plurality of sound content categories; separating the audio signal into a plurality of content-based audio signals by applying the filters to the audio signal, each of the content-based audio signals contains a content of a corresponding sound content category among the plurality of sound content categories; for each of the content-based audio signals, generating a direction of arrival (DOA) for a sound source of the content-based audio signal.Type: GrantFiled: December 27, 2018Date of Patent: October 22, 2019Assignee: Knowles Electronics, LLCInventors: John Woodruff, Pratik Shah, Sai Ravi Teja Pulugurtha, Harsha Rao
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Publication number: 20190268478Abstract: A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that echo estimate from a microphone signal to output an echo cancelled signal, the gain control system comprising a monitoring unit configured to estimate an energy associated with an impulse response of an adaptive filter configured to generate the echo estimate from the far-end signal and a gain tuner configured to adjust an attenuation of at least one of the microphone signal and the far-end signal in dependence on the estimated energy.Type: ApplicationFiled: May 13, 2019Publication date: August 29, 2019Inventors: Senthil Kumar Mani, Gandhi Namani, Srinivas Akella, Sai Ravi Teja Pulugurtha
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Patent number: 10375251Abstract: A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that estimate from a microphone signal to output an echo cancelled signal, the system comprising an echo measurement unit configured to calculate a ratio of the microphone signal to the far-end signal, an attenuation unit configured to attenuate at least one of the microphone signal and the far-end signal to output a second microphone signal and a second far-end signal to the echo canceller, the ratio of the second microphone signal to the second far-end signal being different from the calculated ratio, and an attenuation controller configured to control the attenuation unit, in dependence on the calculated ratio, so as to alter the ratio of the second microphone signal to the second far-end signal and control the echo-cancelled signal.Type: GrantFiled: June 26, 2017Date of Patent: August 6, 2019Assignee: Imagination Technologies LimitedInventors: Senthil Kumar Mani, Ghandhi Namani, Srinivas Akella, Sai Ravi Teja Pulugurtha
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Publication number: 20190208317Abstract: A method for estimating directions of arrival of audio signals based on categories is disclosed herein. The method includes receiving an audio signal; generating a plurality of filters based on the audio signal, each of the filters corresponding to one of a plurality of sound content categories; separating the audio signal into a plurality of content-based audio signals by applying the filters to the audio signal, each of the content-based audio signals contains a content of a corresponding sound content category among the plurality of sound content categories; for each of the content-based audio signals, generating a direction of arrival (DOA) for a sound source of the content-based audio signal.Type: ApplicationFiled: December 27, 2018Publication date: July 4, 2019Applicant: Knowles Electronics, LLCInventors: John Woodruff, Pratik Shah, Sai Ravi Teja Pulugurtha, Harsha Rao
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Patent number: 10334113Abstract: A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that echo estimate from a microphone signal to output an echo cancelled signal, the gain control system comprising a monitoring unit configured to estimate an energy associated with an impulse response of an adaptive filter configured to generate the echo estimate from the far-end signal and a gain tuner configured to adjust an attenuation of at least one of the microphone signal and the far-end signal in dependence on the estimated energy.Type: GrantFiled: June 8, 2017Date of Patent: June 25, 2019Assignee: Imagination Technologies LimitedInventors: Senthil Kumar Mani, Gandhi Namani, Srinivas Akella, Sai Ravi Teja Pulugurtha
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Publication number: 20170295283Abstract: A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that estimate from a microphone signal to output an echo cancelled signal, the system comprising an echo measurement unit configured to calculate a ratio of the microphone signal to the far-end signal, an attenuation unit configured to attenuate at least one of the microphone signal and the far-end signal to output a second microphone signal and a second far-end signal to the echo canceller, the ratio of the second microphone signal to the second far-end signal being different from the calculated ratio, and an attenuation controller configured to control the attenuation unit, in dependence on the calculated ratio, so as to alter the ratio of the second microphone signal to the second far-end signal and control the echo-cancelled signal.Type: ApplicationFiled: June 26, 2017Publication date: October 12, 2017Inventors: Senthil Kumar Mani, Gandhi Namani, Srinivas Akella, Sai Ravi Teja Pulugurtha
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Publication number: 20170272579Abstract: A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that echo estimate from a microphone signal to output an echo cancelled signal, the gain control system comprising a monitoring unit configured to estimate an energy associated with an impulse response of an adaptive filter configured to generate the echo estimate from the far-end signal and a gain tuner configured to adjust an attenuation of at least one of the microphone signal and the far-end signal in dependence on the estimated energy.Type: ApplicationFiled: June 8, 2017Publication date: September 21, 2017Inventors: Senthil Kumar Mani, Gandhi Namani, Srinivas Akella, Sai Ravi Teja Pulugurtha
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Patent number: 9706057Abstract: A threshold control system for controlling a non-linear processor in an echo canceller, the non-linear processor being configured to remove any signal energy below a threshold that remains in a microphone signal after the echo canceller has subtracted an echo estimate from it, the threshold control system comprising a convergence unit configured to determine an indication of the stability of an adaptive filter, the adaptive filter being configured to continuously model an echo path so as to generate the echo estimate, and a threshold tuner configured to adjust the threshold of the non-linear processor in dependence on the indication.Type: GrantFiled: April 2, 2015Date of Patent: July 11, 2017Assignee: Imagination Technologies LimitedInventors: Senthil Kumar Mani, Gandhi Namani, Srinivas Akella, Sai Ravi Teja Pulugurtha
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Patent number: 9692882Abstract: A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that estimate from a microphone signal to output an echo cancelled signal, the system comprising an echo measurement unit configured to calculate a ratio of the microphone signal to the far-end signal, an attenuation unit configured to attenuate at least one of the microphone signal and the far-end signal to output a second microphone signal and a second far-end signal to the echo canceller, the ratio of the second microphone signal to the second far-end signal being different from the calculated ratio, and an attenuation controller configured to control the attenuation unit, in dependence on the calculated ratio, so as to alter the ratio of the second microphone signal to the second far-end signal and control the echo-cancelled signal.Type: GrantFiled: April 2, 2015Date of Patent: June 27, 2017Assignee: Imagination Technologies LimitedInventors: Senthil Kumar Mani, Gandhi Namani, Srinivas Akella, Sai Ravi Teja Pulugurtha
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Publication number: 20150288807Abstract: A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that estimate from a microphone signal to output an echo cancelled signal, the system comprising an echo measurement unit configured to calculate a ratio of the microphone signal to the far-end signal, an attenuation unit configured to attenuate at least one of the microphone signal and the far-end signal to output a second microphone signal and a second far-end signal to the echo canceller, the ratio of the second microphone signal to the second far-end signal being different from the calculated ratio, and an attenuation controller configured to control the attenuation unit, in dependence on the calculated ratio, so as to alter the ratio of the second microphone signal to the second far-end signal and control the echo-cancelled signal.Type: ApplicationFiled: April 2, 2015Publication date: October 8, 2015Inventors: Senthil Kumar MANI, Gandhi NAMANI, Srinivas AKELLA, Sai Ravi Teja PULUGURTHA
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Publication number: 20150288826Abstract: A threshold control system for controlling a non-linear processor in an echo canceller, the non-linear processor being configured to remove any signal energy below a threshold that remains in a microphone signal after the echo canceller has subtracted an echo estimate from it, the threshold control system comprising a convergence unit configured to determine an indication of the stability of an adaptive filter, the adaptive filter being configured to continuously model an echo path so as to generate the echo estimate, and a threshold tuner configured to adjust the threshold of the non-linear processor in dependence on the indication.Type: ApplicationFiled: April 2, 2015Publication date: October 8, 2015Inventors: Senthil Kumar MANI, Gandhi NAMANI, Srinivas AKELLA, Sai Ravi Teja PULUGURTHA