Patents by Inventor Dinesh Ramakrishnan
Dinesh Ramakrishnan 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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Publication number: 20240236595Abstract: Systems and techniques are provided for performing spatial audio recording. For instance, a process can include detecting an occlusion for at least one audio frame of one or more audio frames associated with a spatial audio recording. During the spatial audio recording, the process can further include selecting, based on detection of the occlusion, at least one of an occluded spatial filter for the one or more audio frames or a non-occluded spatial filter for the one or more audio frames.Type: ApplicationFiled: October 20, 2022Publication date: July 11, 2024Inventors: Sanghyun CHI, Dinesh RAMAKRISHNAN, Krishna Kumar MALTHAKAL
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Publication number: 20240137720Abstract: Systems and techniques are provided for performing spatial audio recording. For instance, a process can include detecting an occlusion for at least one audio frame of one or more audio frames associated with a spatial audio recording. During the spatial audio recording, the process can further include selecting, based on detection of the occlusion, at least one of an occluded spatial filter for the one or more audio frames or a non-occluded spatial filter for the one or more audio frames.Type: ApplicationFiled: October 19, 2022Publication date: April 25, 2024Inventors: Sanghyun CHI, Dinesh RAMAKRISHNAN, Krishna Kumar MALTHAKAL
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Publication number: 20240031765Abstract: A device includes a processor configured to perform signal enhancement of an input audio signal to generate an enhanced mono audio signal. The processor is also configured to mix a first audio signal and a second audio signal to generate a stereo audio signal. The first audio signal is based on the enhanced mono audio signal.Type: ApplicationFiled: July 25, 2022Publication date: January 25, 2024Inventors: Isaac Garcia MUNOZ, Shankar THAGADUR SHIVAPPA, Mason DAVIS, Alex TUNG, Dinesh RAMAKRISHNAN, Andre SCHEVCIW
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Patent number: 11741983Abstract: System and method for detecting and identifying noises in a sound signal occurring during a call on a mobile device and selectively filtering and suppressing the noises in the sound signal are provided. In the mobile device, a processor is configured to receive a sound signal, detect noises in the received sound signal, identify the noises in the received sound signal, display the identified noises in a user interface (UI), receive a selection of the displayed identified noises from the UI, and filter the received selection of the displayed identified noises from the received sound signal. The processor may use a machine learning module with a neural network to detect and identify the noises in the received sound signal.Type: GrantFiled: January 13, 2021Date of Patent: August 29, 2023Assignee: QUALCOMM IncorporatedInventors: Vishnu Vardhan Kasilya Sudarsan, Naga Chandan Babu Gudivada, Dinesh Ramakrishnan, Rameshkumar Karuppusamy
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Publication number: 20220223165Abstract: System and method for detecting and identifying noises in a sound signal occurring during a call on a mobile device and selectively filtering and suppressing the noises in the sound signal are provided. In the mobile device, a processor is configured to receive a sound signal, detect noises in the received sound signal, identify the noises in the received sound signal, display the identified noises in a user interface (UI), receive a selection of the displayed identified noises from the UI, and filter the received selection of the displayed identified noises from the received sound signal. The processor may use a machine learning module with a neural network to detect and identify the noises in the received sound signal.Type: ApplicationFiled: January 13, 2021Publication date: July 14, 2022Inventors: Vishnu Vardhan KASILYA SUDARSAN, Naga Chandan Babu GUDIVADA, Dinesh RAMAKRISHNAN, Rameshkumar KARUPPUSAMY
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Patent number: 11348567Abstract: Aspects of the disclosure relate to using a display as a sound emitter and may relate to an electronic device including a display. In particular a vibration sensor such as an accelerometer is physically coupled to the display and senses display vibration to provide a high accuracy feedback loop with respect to representing actual audio output from the display. The electronic device includes an actuator physically coupled to the display and configured to cause vibration of the display in response to an audio signal. The electronic device further includes a vibration sensor physically coupled to the display and configured to output a vibration sensor signal proportional to the vibration of the display due to the actuator.Type: GrantFiled: February 20, 2020Date of Patent: May 31, 2022Assignee: QUALCOMM IncorporatedInventors: Ricardo De Jesus Bernal Castillo, Wade Heimbigner, Dinesh Ramakrishnan, Andre Schevciw, Sang-Uk Ryu
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Patent number: 11031026Abstract: Methods, systems, computer-readable media, and apparatuses for acoustic echo cancellation during playback of encoded audio are presented. In some embodiments, a decoder is arranged to decode an encoded media signal to produce an echo reference signal, and an echo canceler is arranged to perform an acoustic echo cancellation operation, based on the echo reference signal, on an input voice signal to produce an echo-cancelled voice signal. The echo canceler may be configured to reduce, relative to an energy of a voice component of the input voice signal, an energy of a signal component of the input voice signal that is based on audio content from the encoded media signal.Type: GrantFiled: December 13, 2018Date of Patent: June 8, 2021Assignee: Qualcomm IncorporatedInventors: Andrew Kostic, Eddie Choy, Dinesh Ramakrishnan
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Publication number: 20200275221Abstract: Aspects of the disclosure relate to using a display as a sound emitter and may relate to an electronic device including a display. In particular a vibration sensor such as an accelerometer is physically coupled to the display and senses display vibration to provide a high accuracy feedback loop with respect to representing actual audio output from the display. The electronic device includes an actuator physically coupled to the display and configured to cause vibration of the display in response to an audio signal. The electronic device further includes a vibration sensor physically coupled to the display and configured to output a vibration sensor signal proportional to the vibration of the display due to the actuator.Type: ApplicationFiled: February 20, 2020Publication date: August 27, 2020Inventors: Ricardo De Jesus BERNAL CASTILLO, Wade HEIMBIGNER, Dinesh RAMAKRISHNAN, Andre Gustavo SCHEVCIW, Sang-Uk RYU
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Publication number: 20200194019Abstract: Methods, systems, computer-readable media, and apparatuses for acoustic echo cancellation during playback of encoded audio are presented. In some embodiments, a decoder is arranged to decode an encoded media signal to produce an echo reference signal, and an echo canceler is arranged to perform an acoustic echo cancellation operation, based on the echo reference signal, on an input voice signal to produce an echo-cancelled voice signal. The echo canceler may be configured to reduce, relative to an energy of a voice component of the input voice signal, an energy of a signal component of the input voice signal that is based on audio content from the encoded media signal.Type: ApplicationFiled: December 13, 2018Publication date: June 18, 2020Inventors: Andrew KOSTIC, Eddie CHOY, Dinesh RAMAKRISHNAN
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Patent number: 9552840Abstract: A method for audio signal processing is described. The method includes decomposing a recorded auditory scene into a first category of localizable sources and a second category of ambient sound. The method also includes recording an indication of the directions of each of the localizable sources. The method may be performed with a device having a microphone array.Type: GrantFiled: October 24, 2011Date of Patent: January 24, 2017Assignee: QUALCOMM IncorporatedInventors: Lae-Hoon Kim, Erik Visser, Pei Xiang, Ian Ernan Liu, Dinesh Ramakrishnan
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Patent number: 9402132Abstract: In general, techniques are described for limiting active noise cancellation output. As one example, an apparatus comprising one or more processors may perform the techniques. The one or more processors may be configured to, when an estimated noise level increases, dynamically lowering application of active noise cancellation to at least a portion of an audio signal to obtain at least a portion of an active noise cancelled version of the audio signal.Type: GrantFiled: September 4, 2014Date of Patent: July 26, 2016Assignee: QUALCOMM IncorporatedInventors: Hyun Jin Park, Deepak Kumar Challa, Song Wang, Dinesh Ramakrishnan
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Patent number: 9258661Abstract: A method includes receiving, at a processor, a first data frame at a first time from a first microphone. The method also includes receiving a second data frame at the first time from a second microphone. The method further includes calculating a power ratio of the first microphone and the second microphone based on the first data frame and the second data frame in response to determining that the first data frame and the second data frame are noise data frames.Type: GrantFiled: December 23, 2013Date of Patent: February 9, 2016Assignee: Qualcomm IncorporatedInventors: Jimeng Zheng, Ian Ernan Liu, Dinesh Ramakrishnan, Deepak Kumar Challa
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Patent number: 9119159Abstract: To reduce the risk of brown outs and resets in a mobile station using a far-field speaker, a voltage level of a battery and a level of an input audio signal are monitored. When the level of the audio signal increases past a threshold level, and the voltage level of the battery falls below a threshold voltage, an attenuation is determined and applied to the audio signal. The applied attenuation reduces the volume of the audio signal, which reduces the risk of a brown out or a reset due to insufficient voltage in the mobile station.Type: GrantFiled: August 9, 2011Date of Patent: August 25, 2015Assignee: QUALCOMM IncorporatedInventors: Roy B. Silverstein, Dinesh Ramakrishnan
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Patent number: 9113240Abstract: Signal processing solutions take advantage of microphones located on different devices and improve the quality of transmitted voice signals in a communication system. With usage of various devices such as Bluetooth headsets, wired headsets and the like in conjunction with mobile handsets, multiple microphones located on different devices are exploited for improving performance and/or voice quality in a communication system. Audio signals are recorded by microphones on different devices and processed to produce various benefits, such as improved voice quality, background noise reduction, voice activity detection and the like.Type: GrantFiled: March 16, 2009Date of Patent: August 18, 2015Assignee: QUALCOMM IncorporatedInventors: Dinesh Ramakrishnan, Song Wang
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Systems, methods, apparatus, and computer-readable media for orientation-sensitive recording control
Patent number: 9031256Abstract: A method of orientation-sensitive recording control includes indicating, within a portable device and at a first time, that the portable device has a first orientation relative to a gravitational axis and, based on the indication, selecting a first pair among at least three microphone channels of the portable device. This method also includes indicating, within the portable device and at a second time that is different than the first time, that the portable device has a second orientation relative to the gravitational axis that is different than the first orientation and, based on the indication, selecting a second pair among the at least three microphone channels that is different than the first pair. In this method, each the at least three microphone channels is based on a signal produced by a corresponding one of at least three microphones of the portable device.Type: GrantFiled: October 24, 2011Date of Patent: May 12, 2015Assignee: QUALCOMM IncorporatedInventors: Erik Visser, Ian Ernan Liu, Dinesh Ramakrishnan, Lae-Hoon Kim, Pei Xiang -
Publication number: 20150104031Abstract: In general, techniques are described for limiting active noise cancellation output. As one example, an apparatus comprising one or more processors may perform the techniques. The one or more processors may be configured to, when an estimated noise level increases, dynamically lowering application of active noise cancellation to at least a portion of an audio signal to obtain at least a portion of an active noise cancelled version of the audio signal.Type: ApplicationFiled: September 4, 2014Publication date: April 16, 2015Inventors: Hyun Jin Park, Deepak Kumar Challa, Song Wang, Dinesh Ramakrishnan
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Publication number: 20140341380Abstract: A method includes receiving, at a processor, a first data frame at a first time from a first microphone. The method also includes receiving a second data frame at the first time from a second microphone. The method further includes calculating a power ratio of the first microphone and the second microphone based on the first data frame and the second data frame in response to determining that the first data frame and the second data frame are noise data frames.Type: ApplicationFiled: December 23, 2013Publication date: November 20, 2014Applicant: QUALCOMM IncorporatedInventors: Jimeng Zheng, Ian Ernan Liu, Dinesh Ramakrishnan, Deepak Kumar Challa
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Patent number: 8812309Abstract: A method for suppressing ambient noise using multiple audio signals may include providing at least two audio signals captured by at least two electro-acoustic transducers. The at least two audio signals may include desired audio and ambient noise. The method may also include performing beamforming on the at least two audio signals in order to obtain a desired audio reference signal that is separate from a noise reference signal.Type: GrantFiled: November 25, 2008Date of Patent: August 19, 2014Assignee: QUALCOMM IncorporatedInventors: Dinesh Ramakrishnan, Song Wang
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Patent number: 8811601Abstract: A method for echo cancellation and noise suppression is disclosed. Linear echo cancellation (LEC) is performed for a primary microphone channel on an entire frequency band or in a range of frequencies where echo is audible. LEC is performed on one or more secondary microphone channels only on a lower frequency range over which spatial processing is effective. The microphone channels are spatially processed over the lower frequency range after LEC. Non-linear noise suppression post-processing is performed on the entire frequency band. Echo post-processing is performed on the entire frequency band.Type: GrantFiled: April 4, 2011Date of Patent: August 19, 2014Assignee: QUALCOMM IncorporatedInventors: Asif I. Mohammad, Kwokleung Chan, Ian Ernan Liu, Erik Visser, Dinesh Ramakrishnan
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Patent number: 8650238Abstract: In a digital system with more than one clock source, lack of synchronization between the clock sources may cause overflow or underflow in sample buffers, also called sample slipping. Sample slipping may lead to undesirable artifacts in the processed signal due to discontinuities introduced by the addition or removal of extra samples. To smooth out discontinuities caused by sample slipping, samples are filtered to when a buffer overflow condition occurs, and the samples are interpolated to produce additional samples when a buffer underflow condition occurs. The interpolated samples may also be filtered. The filtering and interpolation operations can be readily implemented without adding significant burden to the computational complexity of a real-time digital system.Type: GrantFiled: November 28, 2007Date of Patent: February 11, 2014Assignee: QUALCOMM IncorporatedInventors: Dinesh Ramakrishnan, Song Wang, Eddie L. T. Choy, Samir Kumar Gupta