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).

  • Publication number: 20240236595
    Abstract: 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: Application
    Filed: October 20, 2022
    Publication date: July 11, 2024
    Inventors: Sanghyun CHI, Dinesh RAMAKRISHNAN, Krishna Kumar MALTHAKAL
  • Publication number: 20240137720
    Abstract: 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: Application
    Filed: October 19, 2022
    Publication date: April 25, 2024
    Inventors: Sanghyun CHI, Dinesh RAMAKRISHNAN, Krishna Kumar MALTHAKAL
  • Publication number: 20240031765
    Abstract: 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: Application
    Filed: July 25, 2022
    Publication date: January 25, 2024
    Inventors: Isaac Garcia MUNOZ, Shankar THAGADUR SHIVAPPA, Mason DAVIS, Alex TUNG, Dinesh RAMAKRISHNAN, Andre SCHEVCIW
  • Patent number: 11741983
    Abstract: 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: Grant
    Filed: January 13, 2021
    Date of Patent: August 29, 2023
    Assignee: QUALCOMM Incorporated
    Inventors: Vishnu Vardhan Kasilya Sudarsan, Naga Chandan Babu Gudivada, Dinesh Ramakrishnan, Rameshkumar Karuppusamy
  • Publication number: 20220223165
    Abstract: 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: Application
    Filed: January 13, 2021
    Publication date: July 14, 2022
    Inventors: Vishnu Vardhan KASILYA SUDARSAN, Naga Chandan Babu GUDIVADA, Dinesh RAMAKRISHNAN, Rameshkumar KARUPPUSAMY
  • Patent number: 11348567
    Abstract: 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: Grant
    Filed: February 20, 2020
    Date of Patent: May 31, 2022
    Assignee: QUALCOMM Incorporated
    Inventors: Ricardo De Jesus Bernal Castillo, Wade Heimbigner, Dinesh Ramakrishnan, Andre Schevciw, Sang-Uk Ryu
  • Patent number: 11031026
    Abstract: 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: Grant
    Filed: December 13, 2018
    Date of Patent: June 8, 2021
    Assignee: Qualcomm Incorporated
    Inventors: Andrew Kostic, Eddie Choy, Dinesh Ramakrishnan
  • Publication number: 20200275221
    Abstract: 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: Application
    Filed: February 20, 2020
    Publication date: August 27, 2020
    Inventors: Ricardo De Jesus BERNAL CASTILLO, Wade HEIMBIGNER, Dinesh RAMAKRISHNAN, Andre Gustavo SCHEVCIW, Sang-Uk RYU
  • Publication number: 20200194019
    Abstract: 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: Application
    Filed: December 13, 2018
    Publication date: June 18, 2020
    Inventors: Andrew KOSTIC, Eddie CHOY, Dinesh RAMAKRISHNAN
  • Patent number: 9552840
    Abstract: 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: Grant
    Filed: October 24, 2011
    Date of Patent: January 24, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Lae-Hoon Kim, Erik Visser, Pei Xiang, Ian Ernan Liu, Dinesh Ramakrishnan
  • Patent number: 9402132
    Abstract: 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: Grant
    Filed: September 4, 2014
    Date of Patent: July 26, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Hyun Jin Park, Deepak Kumar Challa, Song Wang, Dinesh Ramakrishnan
  • Patent number: 9258661
    Abstract: 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: Grant
    Filed: December 23, 2013
    Date of Patent: February 9, 2016
    Assignee: Qualcomm Incorporated
    Inventors: Jimeng Zheng, Ian Ernan Liu, Dinesh Ramakrishnan, Deepak Kumar Challa
  • Patent number: 9119159
    Abstract: 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: Grant
    Filed: August 9, 2011
    Date of Patent: August 25, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Roy B. Silverstein, Dinesh Ramakrishnan
  • Patent number: 9113240
    Abstract: 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: Grant
    Filed: March 16, 2009
    Date of Patent: August 18, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Dinesh Ramakrishnan, Song Wang
  • Patent number: 9031256
    Abstract: 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: Grant
    Filed: October 24, 2011
    Date of Patent: May 12, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Erik Visser, Ian Ernan Liu, Dinesh Ramakrishnan, Lae-Hoon Kim, Pei Xiang
  • Publication number: 20150104031
    Abstract: 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: Application
    Filed: September 4, 2014
    Publication date: April 16, 2015
    Inventors: Hyun Jin Park, Deepak Kumar Challa, Song Wang, Dinesh Ramakrishnan
  • Publication number: 20140341380
    Abstract: 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: Application
    Filed: December 23, 2013
    Publication date: November 20, 2014
    Applicant: QUALCOMM Incorporated
    Inventors: Jimeng Zheng, Ian Ernan Liu, Dinesh Ramakrishnan, Deepak Kumar Challa
  • Patent number: 8812309
    Abstract: 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: Grant
    Filed: November 25, 2008
    Date of Patent: August 19, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Dinesh Ramakrishnan, Song Wang
  • Patent number: 8811601
    Abstract: 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: Grant
    Filed: April 4, 2011
    Date of Patent: August 19, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Asif I. Mohammad, Kwokleung Chan, Ian Ernan Liu, Erik Visser, Dinesh Ramakrishnan
  • Patent number: 8650238
    Abstract: 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: Grant
    Filed: November 28, 2007
    Date of Patent: February 11, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Dinesh Ramakrishnan, Song Wang, Eddie L. T. Choy, Samir Kumar Gupta